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Monthly climate in Thornton, Colorado, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Thornton features a humid continental climate (Dfb).Temperatures typically range between -1 °C (30 °F) and 23 °C (74 °F) through the year, but rarely can drop to -25 °C (-12 °F) or can rise to as high as 37 °C (99 °F).The average annual precipitation amounts to about 507 mm (20.0 inches) and receives 87 rainy days on the 1 mm (0.04 inches) threshold annually.Thornton enjoys an average of 3538 hours of sunshine throughout the year, and daylight varies from 9 hours 23 minutes to 14 hours 55 minutes per day.

Monthly average temperatures in Thornton, Colorado, United States §

The warmest months in Thornton are June, July and August, with daily mean temperatures ranging from 20 to 23 °C (68 - 74 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -1 to 1 °C (30 - 34 °F) throughout the day. On average each year, Thornton experiences 100 days above 25 °C (77.0 °F) and 132 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Thornton, Colorado, 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 19°C
(67°F)		 25°C
(78°F)		 27°C
(80°F)		 29°C
(84°F)		 33°C
(91°F)		 37°C
(99°F)		 36°C
(98°F)		 36°C
(97°F)		 36°C
(98°F)		 30°C
(86°F)		 25°C
(78°F)		 22°C
(72°F)
Mean maximum 16°C
(61°F)		 18°C
(65°F)		 23°C
(73°F)		 26°C
(80°F)		 29°C
(85°F)		 32°C
(90°F)		 36°C
(97°F)		 34°C
(94°F)		 35°C
(96°F)		 28°C
(83°F)		 23°C
(74°F)		 18°C
(64°F)
Average high 7°C
(44°F)		 6°C
(43°F)		 12°C
(54°F)		 16°C
(61°F)		 20°C
(69°F)		 28°C
(83°F)		 31°C
(88°F)		 30°C
(86°F)		 27°C
(81°F)		 17°C
(64°F)		 13°C
(55°F)		 8°C
(47°F)
Daily mean -1°C
(31°F)		 -1°C
(30°F)		 4°C
(40°F)		 8°C
(47°F)		 13°C
(56°F)		 20°C
(68°F)		 23°C
(74°F)		 22°C
(72°F)		 19°C
(66°F)		 9°C
(49°F)		 5°C
(41°F)		 1°C
(34°F)
Average low -6°C
(21°F)		 -8°C
(19°F)		 -2°C
(28°F)		 1°C
(34°F)		 6°C
(43°F)		 12°C
(54°F)		 16°C
(60°F)		 15°C
(59°F)		 11°C
(52°F)		 2°C
(37°F)		 -2°C
(29°F)		 -5°C
(23°F)
Mean minimum -18°C
(-0°F)		 -20°C
(-4°F)		 -13°C
(8°F)		 -8°C
(18°F)		 -1°C
(30°F)		 7°C
(44°F)		 11°C
(52°F)		 12°C
(53°F)		 4°C
(39°F)		 -10°C
(13°F)		 -10°C
(14°F)		 -14°C
(7°F)
Minimum -23°C
(-10°F)		 -25°C
(-12°F)		 -20°C
(-5°F)		 -14°C
(8°F)		 -6°C
(21°F)		 5°C
(42°F)		 10°C
(51°F)		 10°C
(50°F)		 -2°C
(30°F)		 -18°C
(1°F)		 -16°C
(3°F)		 -19°C
(-1°F)

Compare climate in Thornton with other places

Compare temperature, precipitation, sunshine, UV index in Thornton, Colorado, United States with other places around the world.

Monthly average precipitation in Thornton, Colorado, United States §

Thornton usually has the most precipitation in March, April and May, with an average of 11 rainy days and 74 mm (2.9 inches) of precipitation per month.The driest months in Thornton are January, November and December. On average, 20 mm (0.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Thornton, Colorado, 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) 23 (0.9) 29 (1.1) 57 (2.3) 55 (2.2) 111 (4.4) 48 (1.9) 43 (1.7) 35 (1.4) 29 (1.2) 37 (1.5) 24 (1.0) 14 (0.6)
Average precipitation days (≥ 1 mm) 4 6 9 10 14 9 9 7 5 7 4 3

Monthly sunshine hours in Thornton, Colorado, United States §

The sunniest months in Thornton are June, July and August, when the sun shines an average of 11 hours 56 minutes a day.Least sunny months in Thornton: January, February and December receive an average of 7 hours 20 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Thornton, Colorado, 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 186 239 290 309 334 371 375 351 310 276 249 241
Mean daily daylight hours 9h 42m 10h 42m 11h 58m 13h 16m 14h 22m 14h 55m 14h 37m 13h 38m 12h 23m 11h 5m 9h 58m 9h 23m

Solar UV radiation in Thornton, Colorado, United States §

Thornton experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 12 - 12, which corresponds to the Extreme category of sun exposure.January, November and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Thornton UV Index data.

Average daily maximum UV levels by month for Thornton, Colorado, 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) 4 6 9 11 12 12 12 11 10 7 5 4