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
60°F
Slight Chance Rain Showers then Showers And Thunderstorms Likely
A slight chance of rain showers before midnight, then showers and thunderstorms likely. Some of the storms could produce heavy rain. Mostly cloudy, with a low around 60. East wind 10 to 15 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for McCullom Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 60°F | Slight Chance Rain Showers then Showers And Thunderstorms Likely | 10 to 15 mph E | 74% |
| Saturday | 75°F | Showers And Thunderstorms then Showers And Thunderstorms Likely | 10 to 15 mph ESE | 96% |
| Saturday Night | 62°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 5 to 10 mph NE | 78% |
| Sunday | 67°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 70% |
| Sunday Night | 54°F | Chance Rain Showers | 15 mph ENE | 43% |
| Monday | 64°F | Chance Rain Showers | 15 mph ENE | 40% |
| Monday Night | 50°F | Chance Rain Showers | 5 to 15 mph ENE | 40% |
| Tuesday | 62°F | Slight Chance Rain Showers | 5 to 10 mph NE | 20% |
| Tuesday Night | 50°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 15% |
| Wednesday | 65°F | Partly Sunny | 5 to 10 mph NE | 9% |
| Wednesday Night | 50°F | Mostly Cloudy | 0 to 5 mph NNE | 5% |
| Thursday | 68°F | Partly Sunny | 0 to 5 mph NNE | 5% |
| Thursday Night | 51°F | Mostly Cloudy | 0 to 5 mph NNE | 5% |
| Friday | 70°F | Mostly Sunny | 0 to 5 mph NNE | 5% |
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
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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 Sep 19, 2026.