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Round Lake, IL weather and climate

Lake County, IL · population 18,588 · about 768 ft elevation

Everything below is a 30 year average for 1991-2020, computed from daily climate history at Round Lake'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
41 in
per year
Hot days
10
above 90 °F
Freezing nights
138
at or below 32 °F
Humidity
71%
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: 30 °FDaily high, Feb: 34 °FDaily high, Mar: 45 °FDaily high, Apr: 57 °FDaily high, May: 69 °FDaily high, Jun: 79 °FDaily high, Jul: 83 °FDaily high, Aug: 81 °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: 37 °FDaily low, May: 47 °FDaily low, Jun: 58 °FDaily low, Jul: 62 °FDaily low, Aug: 61 °FDaily low, Sep: 53 °FDaily low, Oct: 42 °FDaily low, Nov: 30 °FDaily low, Dec: 20 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Daily high303445576979838174614735
Daily low141726374758626153423020

Monthly precipitation

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

0.02.04.0JanMarMayJulSepNovRound Lake, Jan: 2.3 inRound Lake, Feb: 2.1 inRound Lake, Mar: 2.6 inRound Lake, Apr: 4.4 inRound Lake, May: 4.2 inRound Lake, Jun: 3.6 inRound Lake, Jul: 3.3 inRound Lake, Aug: 3.6 inRound Lake, Sep: 2.9 inRound Lake, Oct: 3.3 inRound Lake, Nov: 2.6 inRound Lake, Dec: 2.4 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Round Lake2.32.12.64.44.23.63.33.62.93.32.62.4

Monthly sunny days

Days each month with clear or partly cloudy skies.

01020JanMarMayJulSepNovRound Lake, Jan: 11 daysRound Lake, Feb: 11 daysRound Lake, Mar: 14 daysRound Lake, Apr: 14 daysRound Lake, May: 15 daysRound Lake, Jun: 17 daysRound Lake, Jul: 20 daysRound Lake, Aug: 20 daysRound Lake, Sep: 19 daysRound Lake, Oct: 16 daysRound Lake, Nov: 13 daysRound Lake, Dec: 11 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Round Lake111114141517202019161311

Compare Round Lake with another city

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See weather for every covered Illinois city

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).