McHenry County Weather

Thursday, October 30, 2025

Dense Fog Advisory Expiration for McHenry Co., IL

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

WWUS73 KLOT 301603  NPWLOT    URGENT - WEATHER MESSAGE  National Weather Service Chicago IL  1103 AM CDT Thu Oct 30 2025      /O.EXP.KLOT.FG.Y.0012.000000T0000Z-251030T1600Z/  Boone-McHenry-Lee-De Kalb-Kane-La Salle-  Including the cities of Sycamore, McHenry, Marseilles, La Salle,  DeKalb, Ottawa, Woodstock, Crystal Lake, Streator, Mendota,  Elgin, Dixon, Aurora, Belvidere, and Algonquin  1103 AM CDT Thu Oct 30 2025    ...DENSE FOG ADVISORY HAS EXPIRED...    Fog will continue to diminish across the area going into this   afternoon.

https://p.wxn.io/i70kh

Source: nwws

Dense Fog Advisory for McHenry Co., IL until 11:00 AM CDT 10/30

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

WWUS73 KLOT 301458  NPWLOT    URGENT - WEATHER MESSAGE  National Weather Service Chicago IL  958 AM CDT Thu Oct 30 2025        /O.EXT.KLOT.FG.Y.0012.000000T0000Z-251030T1600Z/  Boone-McHenry-Lee-De Kalb-Kane-La Salle-  Including the cities of Sycamore, McHenry, Marseilles, La Salle,  DeKalb, Ottawa, Woodstock, Crystal Lake, Streator, Mendota,  Elgin, Dixon, Aurora, Belvidere, and Algonquin  958 AM CDT Thu Oct 30 2025    ...DENSE FOG ADVISORY NOW IN EFFECT UNTIL 11 AM CDT THIS MORNING...    * WHAT...Visibility of around one quarter mile in dense fog.    * WHERE...Boone, De Kalb, La Salle, Lee, Kane, and McHenry Counties.    * WHEN...Until 11 AM CDT this morning.    * IMPACTS...Low visibility could make driving conditions hazardous.    PRECAUTIONARY/PREPAREDNESS ACTIONS...    If driving, slow down, use your headlights, and leave plenty of   distance ahead of you.    &amp;&amp;

https://p.wxn.io/t3fvw

Source: nwws

Dense Fog Advisory for McHenry Co., IL until 10:00 AM CDT 10/30

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

WWUS73 KLOT 301247  NPWLOT    URGENT - WEATHER MESSAGE  National Weather Service Chicago IL  747 AM CDT Thu Oct 30 2025      /O.NEW.KLOT.FG.Y.0012.251030T1247Z-251030T1500Z/  Boone-McHenry-Lee-De Kalb-Kane-La Salle-Kendall-  Including the cities of Sycamore, McHenry, Marseilles, Oswego, La  Salle, DeKalb, Plano, Ottawa, Woodstock, Crystal Lake, Yorkville,  Streator, Mendota, Elgin, Dixon, Aurora, Belvidere, and Algonquin  747 AM CDT Thu Oct 30 2025    ...DENSE FOG ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING...    * WHAT...Visibility of around one quarter mile in dense fog.    * WHERE...Boone, De Kalb, La Salle, Lee, Kane, Kendall, and McHenry     Counties.    * WHEN...Until 10 AM CDT this morning.    * IMPACTS...Low visibility could make driving conditions hazardous.    PRECAUTIONARY/PREPAREDNESS ACTIONS...    If driving, slow down, use your headlights, and leave plenty of   distance ahead of you.    &amp;&amp;

https://p.wxn.io/lrpwd

Source: nwws

Friday, October 24, 2025

Freeze Warning Expiration for McHenry Co., IL

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

WWUS73 KLOT 241256  NPWLOT    URGENT - WEATHER MESSAGE  National Weather Service Chicago IL  756 AM CDT Fri Oct 24 2025      /O.EXP.KLOT.FZ.W.0001.000000T0000Z-251024T1300Z/  Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-La  Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-Northern  Cook-Northern Will-Southern Will-Eastern Will-Lake IN-Newton-  Jasper-Benton-  Including the cities of Oxford, Sycamore, Rockford, Lombard,  Rensselaer, Plano, Aurora, Mundelein, Wilmington, Dwight, Dixon,  Waukegan, McHenry, Streator, Northbrook, Ottawa, Crystal Lake,  Peotone, Wheaton, Pontiac, Paxton, Bradley, Minooka, Channahon,  Mendota, Gilman, Morris, Watseka, Evanston, Buffalo Grove,  Palatine, Roselawn, DeKalb, Woodstock, Crete, Yorkville, Carol  Stream, Belvidere, Beecher, Algonquin, Fairbury, Rochelle,  Joliet, Downers Grove, Marseilles, Morocco, DeMotte, Gibson City,  Coal City, Mokena, Merrillville, Byron, Kentland, Elgin, Oswego,  Fowler, La Salle, Bolingbrook, Naperville, Bourbonnais,  Manhattan, Plainfield, Gary, Gurnee, Schaumburg, Des Plaines,  Oregon, Kankakee, and Hammond  756 AM CDT Fri Oct 24 2025 /856 AM EDT Fri Oct 24 2025/    ...FREEZE WARNING WILL EXPIRE AT 8 AM CDT /9 AM EDT/ THIS MORNING...

https://p.wxn.io/9nfsc

Source: nwws

Freeze Warning for McHenry Co., IL until 8:00 AM CDT 10/24

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

WWUS73 KLOT 240814  NPWLOT    URGENT - WEATHER MESSAGE  National Weather Service Chicago IL  314 AM CDT Fri Oct 24 2025      /O.CON.KLOT.FZ.W.0001.000000T0000Z-251024T1300Z/  Winnebago-Boone-McHenry-Ogle-Lee-De Kalb-Kane-DuPage-La Salle-  Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-Northern Will-  Southern Will-Eastern Will-Newton-Jasper-Benton-  Including the cities of Carol Stream, Oswego, Gilman, Dixon, Coal  City, Sycamore, Plano, Algonquin, Byron, Rockford, Morris,  Fairbury, Roselawn, DeMotte, Rochelle, Bolingbrook, Aurora,  Naperville, Bradley, Manhattan, Plainfield, Peotone, Yorkville,  Oregon, Lombard, Morocco, Crystal Lake, Fowler, La Salle, Paxton,  Downers Grove, Channahon, Rensselaer, Elgin, Streator, DeKalb,  Kankakee, Pontiac, Watseka, Oxford, Ottawa, Beecher, Marseilles,  Mendota, Woodstock, Wilmington, Dwight, Crete, Gibson City,  Belvidere, Wheaton, Bourbonnais, Minooka, McHenry, Kentland,  Mokena, and Joliet  314 AM CDT Fri Oct 24 2025 /414 AM EDT Fri Oct 24 2025/    ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM CDT /9 AM EDT/ THIS  MORNING...    * WHAT...Sub-freezing temperatures as low as the upper 20s expected.    * WHERE...Portions of central, east central, north central, and    northeast Illinois and northwest Indiana.    * WHEN...Until 8 AM CDT /9 AM EDT/ this morning.    * IMPACTS...Frost and freeze conditions could kill crops, other    sensitive vegetation and possibly damage unprotected outdoor    plumbing.    PRECAUTIONARY/PREPAREDNESS ACTIONS...    Take steps now to protect tender plants from the cold.    &amp;&amp;

https://p.wxn.io/neqo0

Source: emwin

Thursday, October 23, 2025

Freeze Warning for McHenry Co., IL until 8:00 AM CDT 10/24

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

WWUS73 KLOT 240221  NPWLOT    URGENT - WEATHER MESSAGE  National Weather Service Chicago IL  921 PM CDT Thu Oct 23 2025      /O.CON.KLOT.FZ.W.0001.251024T0600Z-251024T1300Z/  Winnebago-Boone-McHenry-Ogle-Lee-De Kalb-Kane-DuPage-La Salle-  Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-Northern Will-  Southern Will-Eastern Will-Newton-Jasper-Benton-  Including the cities of Fairbury, Plano, Joliet, Bolingbrook,  Bradley, Watseka, Crystal Lake, McHenry, Rensselaer, Sycamore,  Roselawn, Oswego, Crete, Algonquin, Minooka, Belvidere,  Channahon, Wilmington, Naperville, Yorkville, Streator, Ottawa,  Gilman, Lombard, DeMotte, Byron, Rockford, Bourbonnais, Dwight,  Morocco, DeKalb, Wheaton, Beecher, Aurora, Pontiac, La Salle,  Oregon, Kankakee, Dixon, Gibson City, Morris, Rochelle, Peotone,  Fowler, Marseilles, Downers Grove, Woodstock, Elgin, Mendota,  Coal City, Oxford, Paxton, Mokena, Manhattan, Kentland,  Plainfield, and Carol Stream  921 PM CDT Thu Oct 23 2025 /1021 PM EDT Thu Oct 23 2025/    ...FREEZE WARNING REMAINS IN EFFECT FROM 1 AM CDT /2 AM EDT/ TO 8 AM   CDT /9 AM EDT/ FRIDAY...    * WHAT...Sub-freezing temperatures as low as the upper 20s expected.    * WHERE...Portions of central, east central, north central, and     northeast Illinois and northwest Indiana.    * WHEN...From 1 AM CDT /2 AM EDT/ to 8 AM CDT /9 AM EDT/ Friday.    * IMPACTS...Frost and freeze conditions could kill crops, other     sensitive vegetation and possibly damage unprotected outdoor     plumbing. Frost could harm sensitive outdoor vegetation. Sensitive     outdoor plants may be killed if left uncovered.    PRECAUTIONARY/PREPAREDNESS ACTIONS...    Take steps now to protect tender plants from the cold.    &amp;&amp;

https://p.wxn.io/cooy4

Source: nwws

Freeze Warning for McHenry Co., IL until 8:00 AM CDT 10/24

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

WWUS73 KLOT 231957  NPWLOT    URGENT - WEATHER MESSAGE  National Weather Service Chicago IL  257 PM CDT Thu Oct 23 2025      /O.CON.KLOT.FZ.W.0001.251024T0600Z-251024T1300Z/  Winnebago-Boone-McHenry-Ogle-Lee-De Kalb-Kane-DuPage-La Salle-  Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-Northern Will-  Southern Will-Eastern Will-Newton-Jasper-Benton-  Including the cities of Minooka, DeMotte, Beecher, Algonquin,  Marseilles, Streator, Fairbury, Naperville, Downers Grove,  Bourbonnais, Channahon, Yorkville, McHenry, Ottawa, Wilmington,  Oregon, Morocco, Plainfield, Pontiac, Manhattan, Mokena, Lombard,  Sycamore, Plano, Joliet, Morris, Dwight, Kentland, Watseka,  Belvidere, Gilman, Oswego, Fowler, Rochelle, DeKalb, Roselawn,  Oxford, Aurora, La Salle, Mendota, Gibson City, Bolingbrook,  Rensselaer, Carol Stream, Bradley, Wheaton, Woodstock, Crete,  Byron, Peotone, Crystal Lake, Paxton, Dixon, Elgin, Kankakee,  Rockford, and Coal City  257 PM CDT Thu Oct 23 2025 /357 PM EDT Thu Oct 23 2025/    ...FREEZE WARNING REMAINS IN EFFECT FROM 1 AM CDT /2 AM EDT/ TO 8 AM   CDT /9 AM EDT/ FRIDAY...    * WHAT...Sub-freezing temperatures as low as the upper 20s expected.    * WHERE...Portions of central, east central, north central, and     northeast Illinois and northwest Indiana.    * WHEN...From 1 AM CDT /2 AM EDT/ to 8 AM CDT /9 AM EDT/ Friday.    * IMPACTS...Frost and freeze conditions could kill crops, other     sensitive vegetation and possibly damage unprotected outdoor     plumbing.    PRECAUTIONARY/PREPAREDNESS ACTIONS...    Take steps now to protect tender plants from the cold.    &amp;&amp;

https://p.wxn.io/7agf3

Source: nwws

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