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Grayslake, IL weather and climate

Lake County, IL · population 20,707 · about 784 ft elevation

Everything below is a 30 year average for 1991-2020, computed from daily climate history at Grayslake's own coordinates.

The year at a glance

Sunny days
181
clear or partly cloudy, per year
Precipitation
37 in
per year
Wet days
130
rain or snow per year
Snowfall
42 in
per year
Hot days
10
above 90 °F
Freezing nights
135
at or below 32 °F
Humidity
72%
average relative
Average temperature
48 °F
year round

Monthly temperatures

Average daily high and low for each month, in °F.

Daily highDaily low
20406080JanMarMayJulSepNovDaily high, Jan: 29 °FDaily high, Feb: 33 °FDaily high, Mar: 44 °FDaily high, Apr: 56 °FDaily high, May: 68 °FDaily high, Jun: 78 °FDaily high, Jul: 82 °FDaily high, Aug: 80 °FDaily high, Sep: 74 °FDaily high, Oct: 61 °FDaily high, Nov: 47 °FDaily high, Dec: 35 °FDaily low, Jan: 14 °FDaily low, Feb: 17 °FDaily low, Mar: 26 °FDaily low, Apr: 36 °FDaily low, May: 47 °FDaily low, Jun: 58 °FDaily low, Jul: 63 °FDaily low, Aug: 61 °FDaily low, Sep: 54 °FDaily low, Oct: 42 °FDaily low, Nov: 31 °FDaily low, Dec: 21 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Daily high293344566878828074614735
Daily low141726364758636154423121

Monthly precipitation

Total rain plus melted snow for each month, in inches.

0.02.04.0JanMarMayJulSepNovGrayslake, Jan: 2.3 inGrayslake, Feb: 2.1 inGrayslake, Mar: 2.6 inGrayslake, Apr: 4.4 inGrayslake, May: 4.2 inGrayslake, Jun: 3.6 inGrayslake, Jul: 3.3 inGrayslake, Aug: 3.6 inGrayslake, Sep: 2.9 inGrayslake, Oct: 3.3 inGrayslake, Nov: 2.6 inGrayslake, Dec: 2.4 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Grayslake2.32.12.64.44.23.63.33.62.93.32.62.4

Monthly sunny days

Days each month with clear or partly cloudy skies.

01020JanMarMayJulSepNovGrayslake, Jan: 11 daysGrayslake, Feb: 11 daysGrayslake, Mar: 14 daysGrayslake, Apr: 14 daysGrayslake, May: 15 daysGrayslake, Jun: 17 daysGrayslake, Jul: 20 daysGrayslake, Aug: 20 daysGrayslake, Sep: 19 daysGrayslake, Oct: 16 daysGrayslake, Nov: 13 daysGrayslake, Dec: 11 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Grayslake111114141517202019161311

Compare Grayslake with another city

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About this data

Figures are 30 year averages for 1991-2020. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.

Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).