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Monthly climate in Winthrop Harbor, Illinois, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Winthrop Harbor features a humid continental climate (Dfb).Temperatures typically range between -2 °C (28 °F) and 22 °C (71 °F) through the year, but rarely can drop to -25 °C (-13 °F) or can rise to as high as 28 °C (83 °F).The average annual precipitation amounts to about 1095 mm (43.1 inches) and receives 126 rainy days on the 1 mm (0.04 inches) threshold annually.Winthrop Harbor enjoys an average of 2971 hours of sunshine throughout the year, and daylight varies from 9 hours 5 minutes to 15 hours 14 minutes per day.

Monthly average temperatures in Winthrop Harbor, Illinois, United States §

The warmest months in Winthrop Harbor are July, August and September, with daily mean temperatures ranging from 19 to 22 °C (66 - 71 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -2 to 1 °C (28 - 35 °F) throughout the day. On average each year, Winthrop Harbor experiences 9 days above 25 °C (77.0 °F) and 81 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Winthrop Harbor, Illinois, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 8°C
(47°F)		 11°C
(52°F)		 12°C
(53°F)		 14°C
(57°F)		 18°C
(65°F)		 25°C
(78°F)		 28°C
(83°F)		 28°C
(83°F)		 27°C
(81°F)		 23°C
(73°F)		 15°C
(59°F)		 14°C
(58°F)
Mean maximum 6°C
(44°F)		 8°C
(46°F)		 10°C
(50°F)		 12°C
(55°F)		 17°C
(63°F)		 21°C
(71°F)		 26°C
(80°F)		 27°C
(80°F)		 25°C
(77°F)		 21°C
(71°F)		 13°C
(55°F)		 11°C
(51°F)
Average high -0°C
(32°F)		 0°C
(33°F)		 4°C
(39°F)		 6°C
(44°F)		 11°C
(51°F)		 17°C
(63°F)		 22°C
(72°F)		 23°C
(74°F)		 21°C
(70°F)		 14°C
(58°F)		 7°C
(44°F)		 3°C
(38°F)
Daily mean -2°C
(28°F)		 -2°C
(28°F)		 1°C
(35°F)		 4°C
(40°F)		 9°C
(48°F)		 15°C
(59°F)		 21°C
(69°F)		 22°C
(71°F)		 19°C
(66°F)		 12°C
(55°F)		 5°C
(41°F)		 1°C
(35°F)
Average low -4°C
(24°F)		 -4°C
(24°F)		 -0°C
(32°F)		 3°C
(37°F)		 7°C
(45°F)		 13°C
(57°F)		 19°C
(67°F)		 20°C
(69°F)		 17°C
(64°F)		 11°C
(52°F)		 3°C
(37°F)		 -1°C
(31°F)
Mean minimum -16°C
(4°F)		 -15°C
(4°F)		 -9°C
(16°F)		 -2°C
(29°F)		 3°C
(37°F)		 10°C
(50°F)		 15°C
(59°F)		 17°C
(63°F)		 12°C
(54°F)		 4°C
(39°F)		 -4°C
(25°F)		 -9°C
(16°F)
Minimum -25°C
(-13°F)		 -24°C
(-12°F)		 -20°C
(-4°F)		 -5°C
(23°F)		 1°C
(34°F)		 7°C
(44°F)		 13°C
(55°F)		 16°C
(60°F)		 11°C
(51°F)		 2°C
(36°F)		 -9°C
(17°F)		 -15°C
(5°F)

Compare climate in Winthrop Harbor with other places

Compare temperature, precipitation, sunshine, UV index in Winthrop Harbor, Illinois, United States with other places around the world.

Monthly average precipitation in Winthrop Harbor, Illinois, United States §

Winthrop Harbor usually has the most precipitation in April, May and October, with an average of 13 rainy days and 140 mm (5.5 inches) of precipitation per month.The driest months in Winthrop Harbor are July, August and December. On average, 63 mm (2.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Winthrop Harbor, Illinois, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 78 (3.1) 79 (3.1) 80 (3.1) 116 (4.6) 155 (6.1) 96 (3.8) 62 (2.4) 58 (2.3) 83 (3.3) 150 (5.9) 70 (2.8) 68 (2.7)
Average precipitation days (≥ 1 mm) 9 12 11 13 13 10 9 8 10 14 9 8

Monthly sunshine hours in Winthrop Harbor, Illinois, United States §

The sunniest months in Winthrop Harbor are June, July and August, when the sun shines an average of 11 hours 22 minutes a day.Least sunny months in Winthrop Harbor: January, February and December receive an average of 4 hours 52 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Winthrop Harbor, Illinois, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 111 171 241 255 292 335 366 343 286 219 185 161
Mean daily daylight hours 9h 26m 10h 33m 11h 58m 13h 24m 14h 37m 15h 14m 14h 54m 13h 49m 12h 25m 10h 59m 9h 44m 9h 5m

Solar UV radiation in Winthrop Harbor, Illinois, United States §

Winthrop Harbor experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High category of sun exposure.January, November and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Winthrop Harbor UV Index data.

Average daily maximum UV levels by month for Winthrop Harbor, Illinois, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 2 4 6 8 9 10 10 9 8 5 3 2