McCullom Lake, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for McCullom Lake, a village in Mchenry County, Illinois.
Tonight
59°F
Rain
Rain. Cloudy. Low around 59, with temperatures rising to around 61 overnight. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for McCullom Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 59°F | Rain | 10 to 15 mph S | 80% |
| Wednesday | 63°F | Rain Likely then Rain Showers Likely | 10 to 15 mph SSW | 58% |
| Wednesday Night | 47°F | Chance Rain Showers | 15 mph SW | 25% |
| Thursday | 56°F | Chance Rain Showers | 10 to 15 mph WSW | 50% |
| Thursday Night | 41°F | Chance Rain Showers | 5 to 10 mph NW | 51% |
| Friday | 51°F | Slight Chance Rain Showers | 10 to 15 mph N | 22% |
| Friday Night | 34°F | Mostly Cloudy | 0 to 5 mph NNW | 4% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph WNW | 5% |
| Saturday Night | 34°F | Partly Cloudy | 0 mph | 7% |
| Sunday | 57°F | Mostly Sunny then Slight Chance Rain | 0 to 5 mph W | 18% |
| Sunday Night | 35°F | Mostly Clear | 0 to 5 mph W | 8% |
| Monday | 60°F | Mostly Sunny | 0 to 10 mph WSW | 3% |
| Monday Night | 40°F | Mostly Clear | 5 mph W | 2% |
| Tuesday | 61°F | Mostly Sunny | 5 mph WNW | 1% |
Forecast source: National Weather Service (api.weather.gov) for McCullom Lake (42.368, -88.297). Updated through the day.
Growing snapshot for McCullom Lake
Last spring frost
May 1
First fall frost
Oct 11
Growing season
162 days
Hardiness zone
5b
More local growing data for McCullom Lake: nearby ZIP 60050 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
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Lake Barrington
Lake in the Hills
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Marengo
McHenry
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Spring Grove
Climate data from the nearest NOAA station, Mc Henry -Wg Stratton L&D, Il (2.5 mi from McCullom Lake). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.