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Winthrop Harbor, IL weather and climate

Lake County, IL · population 6,663 · about 663 ft elevation

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

The year at a glance

Sunny days
180
clear or partly cloudy, per year
Precipitation
36 in
per year
Wet days
129
rain or snow per year
Snowfall
38 in
per year
Hot days
9
above 90 °F
Freezing nights
128
at or below 32 °F
Humidity
75%
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: 31 °FDaily high, Feb: 34 °FDaily high, Mar: 44 °FDaily high, Apr: 55 °FDaily high, May: 66 °FDaily high, Jun: 76 °FDaily high, Jul: 81 °FDaily high, Aug: 80 °FDaily high, Sep: 73 °FDaily high, Oct: 61 °FDaily high, Nov: 47 °FDaily high, Dec: 36 °FDaily low, Jan: 16 °FDaily low, Feb: 19 °FDaily low, Mar: 28 °FDaily low, Apr: 36 °FDaily low, May: 46 °FDaily low, Jun: 56 °FDaily low, Jul: 63 °FDaily low, Aug: 62 °FDaily low, Sep: 54 °FDaily low, Oct: 43 °FDaily low, Nov: 32 °FDaily low, Dec: 22 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Daily high313444556676818073614736
Daily low161928364656636254433222

Monthly precipitation

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

0.02.04.0JanMarMayJulSepNovWinthrop Harbor, Jan: 2.2 inWinthrop Harbor, Feb: 2.0 inWinthrop Harbor, Mar: 2.5 inWinthrop Harbor, Apr: 4.3 inWinthrop Harbor, May: 3.9 inWinthrop Harbor, Jun: 3.4 inWinthrop Harbor, Jul: 3.1 inWinthrop Harbor, Aug: 3.6 inWinthrop Harbor, Sep: 2.9 inWinthrop Harbor, Oct: 3.2 inWinthrop Harbor, Nov: 2.6 inWinthrop Harbor, Dec: 2.4 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Winthrop Harbor2.22.02.54.33.93.43.13.62.93.22.62.4

Monthly sunny days

Days each month with clear or partly cloudy skies.

01020JanMarMayJulSepNovWinthrop Harbor, Jan: 10 daysWinthrop Harbor, Feb: 12 daysWinthrop Harbor, Mar: 14 daysWinthrop Harbor, Apr: 14 daysWinthrop Harbor, May: 15 daysWinthrop Harbor, Jun: 17 daysWinthrop Harbor, Jul: 20 daysWinthrop Harbor, Aug: 20 daysWinthrop Harbor, Sep: 20 daysWinthrop Harbor, Oct: 16 daysWinthrop Harbor, Nov: 13 daysWinthrop Harbor, Dec: 11 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Winthrop Harbor101214141517202020161311

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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).