McCullom Lake, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for McCullom Lake, a village in Mchenry County, Illinois.
Overnight
59°F
Rain Showers
Rain showers. Cloudy. Low around 59, with temperatures rising to around 62 overnight. South wind around 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 |
|---|---|---|---|---|
| Overnight | 59°F | Rain Showers | 15 mph S | 82% |
| Wednesday | 63°F | Chance Rain Showers | 15 mph SSW | 32% |
| Wednesday Night | 46°F | Mostly Cloudy then Slight Chance Rain Showers | 15 mph SW | 17% |
| Thursday | 55°F | Chance Rain Showers | 10 to 15 mph W | 53% |
| Thursday Night | 39°F | Chance Rain Showers then Mostly Cloudy | 10 mph NNW | 49% |
| Friday | 48°F | Mostly Cloudy | 10 to 15 mph NNW | 11% |
| Friday Night | 32°F | Partly Cloudy | 5 to 10 mph NNW | 0% |
| Saturday | 51°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 33°F | Partly Cloudy | 0 mph | 0% |
| Sunday | 56°F | Sunny | 0 to 10 mph W | 6% |
| Sunday Night | 35°F | Mostly Clear | 0 to 5 mph W | 0% |
| Monday | 60°F | Mostly Sunny | 0 to 10 mph WSW | 0% |
| Monday Night | 40°F | Partly Cloudy | 0 to 5 mph WSW | 1% |
| Tuesday | 61°F | Sunny | 0 to 5 mph WNW | 0% |
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 Nov 4, 2026.