McHenry County Weather: December 2025

Thursday, December 18, 2025

Dense Fog Advisory Expiration for McHenry Co., IL

C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX

WWUS73 KLOT 181659  NPWLOT    URGENT - WEATHER MESSAGE  National Weather Service Chicago IL  1059 AM CST Thu Dec 18 2025      /O.EXP.KLOT.FG.Y.0016.000000T0000Z-251218T1700Z/  Winnebago-Boone-McHenry-Ogle-Lee-De Kalb-Kane-  Including the cities of Woodstock, Aurora, DeKalb, Sycamore,  Belvidere, Algonquin, Rockford, Crystal Lake, Elgin, Oregon,  Rochelle, Dixon, Byron, and McHenry  1059 AM CST Thu Dec 18 2025    ...DENSE FOG ADVISORY WILL EXPIRE AT 11 AM CST THIS MORNING...    The threat for hazardous driving conditions due to low visibility is   diminishing.

https://p.wxn.io/1enot

Source: nwws

Dense Fog Advisory for McHenry Co., IL until 11:00 AM CST 12/18

C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX

WWUS73 KLOT 181536  NPWLOT    URGENT - WEATHER MESSAGE  National Weather Service Chicago IL  936 AM CST Thu Dec 18 2025      /O.NEW.KLOT.FG.Y.0016.251218T1536Z-251218T1700Z/  Winnebago-Boone-McHenry-Ogle-Lee-De Kalb-Kane-  Including the cities of Woodstock, Aurora, DeKalb, Sycamore,  Belvidere, Algonquin, Rockford, Crystal Lake, Elgin, Oregon,  Rochelle, Dixon, Byron, and McHenry  936 AM CST Thu Dec 18 2025    ...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM CST THIS MORNING...    * WHAT...Visibility one quarter mile or less in dense fog.    * WHERE...Boone, De Kalb, Lee, Ogle, Winnebago, Kane, and McHenry     Counties.    * WHEN...Until 11 AM CST this morning.    * IMPACTS...Very low visibility will make driving conditions     hazardous in open areas.    PRECAUTIONARY/PREPAREDNESS ACTIONS...    If driving, slow down, use your headlights, and leave plenty of   distance ahead of you.    &amp;&amp;

https://p.wxn.io/3k8zz

Source: nwws

Sunday, December 7, 2025

Winter Weather Advisory Expiration for McHenry Co., IL

C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX

WWUS43 KLOT 071452  WSWLOT    URGENT - WINTER WEATHER MESSAGE  National Weather Service Chicago IL  852 AM CST Sun Dec 7 2025      /O.EXP.KLOT.WW.Y.0010.000000T0000Z-251207T1500Z/  McHenry-Lake IL-Kane-DuPage-Kendall-Grundy-Northern Cook-Central  Cook-Northern Will-Southern Will-  Including the cities of Woodstock, Oswego, Wheaton, Algonquin,  Lombard, Crystal Lake, Des Plaines, Cicero, Channahon, Downers  Grove, Gurnee, Plano, Aurora, Oak Lawn, Joliet, Carol Stream,  Waukegan, Schaumburg, Oak Park, Elgin, Coal City, Plainfield,  Palatine, La Grange, Evanston, Manhattan, Chicago, Northbrook,  Yorkville, Mundelein, Mokena, Wilmington, Morris, Minooka,  McHenry, Buffalo Grove, Bolingbrook, and Naperville  852 AM CST Sun Dec 7 2025    ...WINTER WEATHER ADVISORY WILL EXPIRE AT 9 AM CST THIS MORNING...    The accumulating snow has ended. Continue to drive slowly and   cautiously on lingering snow or slush covered roads.

https://p.wxn.io/ul40p

Source: nwws

Winter Weather Advisory for McHenry Co., IL until 9:00 AM CST 12/7

C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX

WWUS43 KLOT 071159  WSWLOT    URGENT - WINTER WEATHER MESSAGE  National Weather Service Chicago IL  559 AM CST Sun Dec 7 2025        /O.CON.KLOT.WW.Y.0010.000000T0000Z-251207T1500Z/  McHenry-Lake IL-Kane-DuPage-Kendall-Northern Cook-Central Cook-  Southern Cook-Northern Will-  Including the cities of Park Forest, Woodstock, Mokena, Palatine,  Chicago, Oak Lawn, Oak Park, McHenry, Cicero, Wheaton, Gurnee,  Lemont, La Grange, Lombard, Mundelein, Elgin, Des Plaines, Carol  Stream, Yorkville, Joliet, Downers Grove, Schaumburg, Calumet  City, Northbrook, Buffalo Grove, Orland Park, Plano, Waukegan,  Algonquin, Bolingbrook, Naperville, Plainfield, Oak Forest,  Evanston, Crystal Lake, Oswego, and Aurora  559 AM CST Sun Dec 7 2025    ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM CST THIS   MORNING...    * WHAT...Snow. Total snow accumulations ranging from 2 to 6 inches.     The highest amounts are expected near and north of I-88.    * WHERE...Cook, DuPage, Kane, Kendall, Lake (IL), McHenry, and     northern Will counties.    * WHEN...Until 9 AM CST this morning.    * IMPACTS...Plan on hazardous travel conditions where roads are snow     covered.    PRECAUTIONARY/PREPAREDNESS ACTIONS...    Slow down and use caution while traveling. The latest road   conditions for Illinois can be obtained at   www.gettingaroundillinois.com.    &amp;&amp;

https://p.wxn.io/uds3t

Source: nwws

Winter Weather Advisory for McHenry Co., IL until 9:00 AM CST 12/7

C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX

WWUS43 KLOT 071023  WSWLOT    URGENT - WINTER WEATHER MESSAGE  National Weather Service Chicago IL  423 AM CST Sun Dec 7 2025        /O.CON.KLOT.WW.Y.0010.000000T0000Z-251207T1500Z/  McHenry-Lake IL-Kane-DuPage-Kendall-Northern Cook-Central Cook-  Southern Cook-Northern Will-  Including the cities of Park Forest, Woodstock, Mokena, Palatine,  Chicago, Oak Lawn, Oak Park, McHenry, Cicero, Wheaton, Gurnee,  Lemont, La Grange, Lombard, Mundelein, Elgin, Des Plaines, Carol  Stream, Yorkville, Joliet, Downers Grove, Schaumburg, Calumet  City, Northbrook, Buffalo Grove, Orland Park, Plano, Waukegan,  Algonquin, Bolingbrook, Naperville, Plainfield, Oak Forest,  Evanston, Crystal Lake, Oswego, and Aurora  423 AM CST Sun Dec 7 2025    ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 AM CST THIS   MORNING...    * WHAT...Snow. Total snow accumulations ranging from 2 to 6 inches.     The highest amounts are expected near and north of I-88.    * WHERE...Cook, DuPage, Kane, Kendall, Lake (IL), McHenry, and     northern Will counties.    * WHEN...Until 9 AM CST this morning.    * IMPACTS...Plan on hazardous travel conditions where roads are snow     covered.    PRECAUTIONARY/PREPAREDNESS ACTIONS...    Slow down and use caution while traveling. The latest road   conditions for Illinois can be obtained at   www.gettingaroundillinois.com.    &amp;&amp;

https://p.wxn.io/5gnbj

Source: nwws

Saturday, December 6, 2025

Winter Weather Advisory for McHenry Co., IL until 9:00 AM CST 12/7

C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX

WWUS43 KLOT 070225  WSWLOT    URGENT - WINTER WEATHER MESSAGE  National Weather Service Chicago IL  825 PM CST Sat Dec 6 2025        /O.CON.KLOT.WW.Y.0010.251207T0600Z-251207T1500Z/  McHenry-Lake IL-Kane-DuPage-Kendall-Northern Cook-Central Cook-  Southern Cook-Northern Will-  Including the cities of Park Forest, La Grange, Oak Park,  Bolingbrook, Mundelein, Wheaton, Oswego, Aurora, Lombard, Buffalo  Grove, Mokena, Gurnee, Cicero, Des Plaines, Naperville, Calumet  City, Oak Forest, Evanston, Woodstock, Downers Grove, Carol  Stream, Orland Park, Chicago, McHenry, Waukegan, Schaumburg,  Joliet, Elgin, Northbrook, Palatine, Plainfield, Algonquin,  Crystal Lake, Lemont, Yorkville, Oak Lawn, and Plano  825 PM CST Sat Dec 6 2025    ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT   TO 9 AM CST SUNDAY...    * WHAT...Snow expected. Total snow accumulations ranging from 2 to 6     inches. The highest amounts are expected in the vicinity of I-88.    * WHERE...A portion of northeast Illinois.    * WHEN...From midnight tonight to 9 AM CST Sunday.    * IMPACTS...Plan on slippery road conditions.    PRECAUTIONARY/PREPAREDNESS ACTIONS...    Slow down and use caution while traveling. The latest road   conditions for Illinois can be obtained at   www.gettingaroundillinois.com.    &amp;&amp;

https://p.wxn.io/evov7

Source: nwws

Winter Weather Advisory for McHenry Co., IL until 9:00 AM CST 12/7

C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX

WWUS43 KLOT 061845  WSWLOT    URGENT - WINTER WEATHER MESSAGE  National Weather Service Chicago IL  1245 PM CST Sat Dec 6 2025        /O.CON.KLOT.WW.Y.0010.251207T0600Z-251207T1500Z/  McHenry-Lake IL-Kane-DuPage-Kendall-Northern Cook-Central Cook-  Southern Cook-Northern Will-  Including the cities of Oak Lawn, Lombard, Aurora, Evanston,  Downers Grove, Oswego, Woodstock, McHenry, Gurnee, Mokena,  Palatine, Waukegan, Plano, Mundelein, Bolingbrook, Naperville,  Wheaton, Elgin, Northbrook, Oak Forest, La Grange, Park Forest,  Joliet, Oak Park, Buffalo Grove, Des Plaines, Yorkville, Chicago,  Calumet City, Crystal Lake, Cicero, Schaumburg, Orland Park,  Algonquin, Plainfield, Lemont, and Carol Stream  1245 PM CST Sat Dec 6 2025    ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT   TO 9 AM CST SUNDAY...    * WHAT...Snow expected. Total snow accumulations between 2 and 5     inches.    * WHERE...A portion of northeast Illinois.    * WHEN...From midnight tonight to 9 AM CST Sunday.    * IMPACTS...Plan on slippery road conditions.    PRECAUTIONARY/PREPAREDNESS ACTIONS...    Slow down and use caution while traveling. The latest road   conditions for Illinois can be obtained at   www.gettingaroundillinois.com.    &amp;&amp;

https://p.wxn.io/dxkd2

Source: nwws

Winter Weather Advisory for McHenry Co., IL until 9:00 AM CST 12/7

C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX

WWUS43 KLOT 061554  WSWLOT    URGENT - WINTER WEATHER MESSAGE  National Weather Service Chicago IL  954 AM CST Sat Dec 6 2025        /O.CON.KLOT.WW.Y.0010.251207T0600Z-251207T1500Z/  McHenry-Lake IL-Kane-DuPage-Kendall-Northern Cook-Central Cook-  Southern Cook-Northern Will-  Including the cities of Lombard, Cicero, Algonquin, Oswego,  Aurora, Des Plaines, Chicago, Calumet City, Oak Park, Evanston,  Waukegan, Joliet, Mokena, Northbrook, Mundelein, Lemont, Wheaton,  Palatine, Buffalo Grove, Yorkville, Plainfield, Carol Stream,  Plano, McHenry, Woodstock, Elgin, Gurnee, Schaumburg,  Bolingbrook, Naperville, Crystal Lake, Oak Lawn, Park Forest,  Orland Park, Oak Forest, Downers Grove, and La Grange  954 AM CST Sat Dec 6 2025    ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT   TO 9 AM CST SUNDAY...    * WHAT...Snow expected. Total snow accumulations between 2 and 5     inches.    * WHERE...A portion of northeast Illinois.    * WHEN...From midnight tonight to 9 AM CST Sunday.    * IMPACTS...Plan on slippery road conditions.    PRECAUTIONARY/PREPAREDNESS ACTIONS...    Slow down and use caution while traveling. The latest road   conditions for Illinois can be obtained at   www.gettingaroundillinois.com.    &amp;&amp;

https://p.wxn.io/sbdtp

Source: nwws

Winter Weather Advisory for McHenry Co., IL until 9:00 AM CST 12/7

C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX

WWUS43 KLOT 060834  WSWLOT    URGENT - WINTER WEATHER MESSAGE  National Weather Service Chicago IL  234 AM CST Sat Dec 6 2025        /O.NEW.KLOT.WW.Y.0010.251207T0600Z-251207T1500Z/  McHenry-Lake IL-Kane-DuPage-Kendall-Northern Cook-Central Cook-  Southern Cook-Northern Will-  Including the cities of Plano, Palatine, Oak Lawn, Plainfield,  Bolingbrook, Gurnee, Naperville, Orland Park, Carol Stream,  Chicago, Elgin, McHenry, Crystal Lake, Calumet City, Oak Forest,  Waukegan, Algonquin, Buffalo Grove, Park Forest, Cicero, Oak  Park, Lemont, Mokena, Joliet, Wheaton, Oswego, Northbrook,  Aurora, La Grange, Downers Grove, Schaumburg, Mundelein,  Evanston, Des Plaines, Yorkville, Lombard, and Woodstock  234 AM CST Sat Dec 6 2025    ...WINTER WEATHER ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM   CST SUNDAY...    * WHAT...Snow expected. Total snow accumulations between 2 and 5     inches.    * WHERE...Cook, DuPage, Kane, Kendall, Lake (IL), McHenry, and     northern Will counties.    * WHEN...From midnight tonight to 9 AM CST Sunday.    * IMPACTS...Plan on slippery road conditions.    PRECAUTIONARY/PREPAREDNESS ACTIONS...    Slow down and use caution while traveling. The latest road   conditions for Illinois can be obtained at   www.gettingaroundillinois.com.    &amp;&amp;

https://p.wxn.io/p8ts1

Source: nwws

Tuesday, December 2, 2025

Winter Weather Advisory Expiration for McHenry Co., IL

C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX

WWUS43 KLOT 020605  WSWLOT    URGENT - WINTER WEATHER MESSAGE  National Weather Service Chicago IL  1205 AM CST Tue Dec 2 2025      /O.EXP.KLOT.WW.Y.0009.000000T0000Z-251202T0600Z/  Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-La  Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-Northern  Cook-Central Cook-Southern Cook-Northern Will-Southern Will-  Eastern Will-  Including the cities of Calumet City, Evanston, Sycamore,  Algonquin, Oregon, Aurora, Naperville, Streator, Marseilles,  Downers Grove, Carol Stream, Oswego, Rockford, Morris, Belvidere,  Dwight, Oak Lawn, Oak Forest, Wilmington, Rochelle, Fairbury,  Cicero, Plainfield, Mundelein, Bourbonnais, Des Plaines, La  Salle, McHenry, Kankakee, Joliet, Beecher, Peotone, Manhattan,  Oak Park, Yorkville, Channahon, Waukegan, Byron, Wheaton,  Bolingbrook, La Grange, Gibson City, Watseka, Orland Park,  Mendota, Dixon, Crete, Palatine, Woodstock, Crystal Lake, Coal  City, Minooka, Gilman, Buffalo Grove, Chicago, Gurnee, Ottawa,  Lemont, Lombard, Park Forest, Mokena, DeKalb, Elgin, Bradley,  Plano, Northbrook, Pontiac, Paxton, and Schaumburg  1205 AM CST Tue Dec 2 2025    ...WINTER WEATHER ADVISORY HAS EXPIRED...    Light snow will end early this morning across northern Illinois.   Untreated surfaces may remain snow covered and slippery.

https://p.wxn.io/ghpnu

Source: nwws

Monday, December 1, 2025

Winter Weather Advisory for McHenry Co., IL until 12:00 AM CST 12/2

C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX

WWUS43 KLOT 020236  WSWLOT    URGENT - WINTER WEATHER MESSAGE  National Weather Service Chicago IL  836 PM CST Mon Dec 1 2025      /O.CON.KLOT.WW.Y.0009.000000T0000Z-251202T0600Z/  Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-La  Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-Northern  Cook-Central Cook-Southern Cook-Northern Will-Southern Will-  Eastern Will-  Including the cities of Manhattan, Cicero, Plano, Schaumburg,  Belvidere, Lemont, DeKalb, Northbrook, Crystal Lake, Calumet  City, Chicago, Byron, Bourbonnais, Plainfield, Carol Stream,  Wheaton, Oak Park, Fairbury, Bolingbrook, Gibson City, Rockford,  Oak Lawn, La Salle, Yorkville, Park Forest, Aurora, Lombard,  Ottawa, Waukegan, Marseilles, Oswego, Mokena, Mendota, Peotone,  Gilman, Naperville, Bradley, Morris, Beecher, Wilmington, Downers  Grove, Dixon, Sycamore, Coal City, Orland Park, La Grange,  Paxton, Rochelle, Channahon, Pontiac, Gurnee, Watseka, Crete,  McHenry, Streator, Algonquin, Woodstock, Elgin, Kankakee,  Evanston, Buffalo Grove, Palatine, Dwight, Joliet, Des Plaines,  Oregon, Minooka, Oak Forest, and Mundelein  836 PM CST Mon Dec 1 2025    ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT CST   TONIGHT...    * WHAT...Snow and winter driving conditions occurring. Total snow     accumulations between 1 and 4 inches, highest south of the     Kankakee River Valley.    * WHERE...Portions of central, east central, north central, and     northeast Illinois.    * WHEN...Until midnight CST tonight.    * IMPACTS...Plan on slippery road conditions.    PRECAUTIONARY/PREPAREDNESS ACTIONS...    Slow down and use caution while traveling. The latest road   conditions for Illinois can be obtained at   www.gettingaroundillinois.com.    &amp;&amp;

https://p.wxn.io/z0ao5

Source: nwws

Winter Weather Advisory for McHenry Co., IL until 12:00 AM CST 12/2

C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX

WWUS43 KLOT 012031  WSWLOT    URGENT - WINTER WEATHER MESSAGE  National Weather Service Chicago IL  231 PM CST Mon Dec 1 2025      /O.CON.KLOT.WW.Y.0009.000000T0000Z-251202T0600Z/  Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-La  Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-Northern  Cook-Central Cook-Southern Cook-Northern Will-Southern Will-  Eastern Will-  Including the cities of Plainfield, DeKalb, La Grange, Elgin,  Schaumburg, Naperville, Minooka, Buffalo Grove, Pontiac, Oswego,  Gibson City, Woodstock, Crystal Lake, Channahon, Rockford, Byron,  Cicero, Lemont, Carol Stream, Dwight, Paxton, Fairbury, Watseka,  Rochelle, Sycamore, Wheaton, Downers Grove, Coal City, Yorkville,  Palatine, Streator, Bradley, Bolingbrook, Mokena, Wilmington,  Crete, McHenry, Lombard, Waukegan, Peotone, La Salle, Beecher,  Dixon, Oak Lawn, Park Forest, Algonquin, Belvidere, Ottawa,  Marseilles, Oregon, Kankakee, Calumet City, Oak Forest,  Manhattan, Bourbonnais, Evanston, Mendota, Northbrook, Mundelein,  Plano, Des Plaines, Joliet, Orland Park, Gilman, Gurnee, Aurora,  Chicago, Oak Park, and Morris  231 PM CST Mon Dec 1 2025    ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT CST   TONIGHT...    * WHAT...Snow and winter driving conditions occurring. Total snow     accumulations between 1 and 4 inches, highest south of the     Kankakee River Valley.    * WHERE...Portions of central, east central, north central, and     northeast Illinois.    * WHEN...Until midnight CST tonight.    * IMPACTS...Plan on slippery road conditions. The hazardous     conditions will impact the evening commute today.    PRECAUTIONARY/PREPAREDNESS ACTIONS...    Slow down and use caution while traveling. The latest road   conditions for Illinois can be obtained at   www.gettingaroundillinois.com.    &amp;&amp;

https://p.wxn.io/twwr9

Source: nwws

Winter Weather Advisory for McHenry Co., IL until 12:00 AM CST 12/2

C: Mchenrycountywx | L: Woodstock | PL: McHenry County WX

WWUS43 KLOT 011703  WSWLOT    URGENT - WINTER WEATHER MESSAGE  National Weather Service Chicago IL  1103 AM CST Mon Dec 1 2025      /O.CON.KLOT.WW.Y.0009.251201T2000Z-251202T0600Z/  Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-La  Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-Northern  Cook-Central Cook-Southern Cook-Northern Will-Southern Will-  Eastern Will-  Including the cities of Plainfield, DeKalb, La Grange, Elgin,  Schaumburg, Naperville, Minooka, Buffalo Grove, Pontiac, Oswego,  Gibson City, Woodstock, Crystal Lake, Channahon, Rockford, Byron,  Cicero, Lemont, Carol Stream, Dwight, Paxton, Fairbury, Watseka,  Rochelle, Sycamore, Wheaton, Downers Grove, Coal City, Yorkville,  Palatine, Streator, Bradley, Bolingbrook, Mokena, Wilmington,  Crete, McHenry, Lombard, Waukegan, Peotone, La Salle, Beecher,  Dixon, Oak Lawn, Park Forest, Algonquin, Belvidere, Ottawa,  Marseilles, Oregon, Kankakee, Calumet City, Oak Forest,  Manhattan, Bourbonnais, Evanston, Mendota, Northbrook, Mundelein,  Plano, Des Plaines, Joliet, Orland Park, Gilman, Gurnee, Aurora,  Chicago, Oak Park, and Morris  1103 AM CST Mon Dec 1 2025    ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 2 PM THIS   AFTERNOON TO MIDNIGHT CST TONIGHT...    * WHAT...Snow and winter driving conditions expected. Total snow     accumulations between 1 and 4 inches, with the highest amounts     generally near and south of the Kankakee River.    * WHERE...Portions of central, east central, north central, and     northeast Illinois.    * WHEN...From 2 PM this afternoon to midnight CST tonight.    * IMPACTS...Plan on slippery road conditions. The hazardous     conditions will likely impact the evening commute today.    PRECAUTIONARY/PREPAREDNESS ACTIONS...    Slow down and use caution while traveling. The latest road   conditions for Illinois can be obtained at   www.gettingaroundillinois.com.    &amp;&amp;

https://p.wxn.io/jvtzm

Source: nwws

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