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Monthly climate in Niwot, Colorado, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Niwot features a cold semi-arid climate (BSk). Temperatures typically range between -4 °C (26 °F) and 20 °C (68 °F) through the year, but rarely can drop to -26 °C (-14 °F) or can rise to as high as 34 °C (93 °F). The average annual precipitation amounts to about 678 mm (26.7 inches) and receives 121 rainy days on the 1 mm (0.04 inches) threshold annually. Niwot enjoys an average of 3515 hours of sunshine throughout the year, and daylight varies from 9 hours 21 minutes to 14 hours 57 minutes per day.

Monthly average temperatures in Niwot, Colorado, United States §

The warmest months in Niwot are June, July and August, with daily mean temperatures ranging from 17 to 20 °C (63 - 68 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -4 to -2 °C (26 - 29 °F) throughout the day. On average each year, Niwot experiences 70 days above 25 °C (77.0 °F) and 160 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Niwot, 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 15°C
(59°F)		 20°C
(69°F)		 23°C
(73°F)		 24°C
(75°F)		 27°C
(81°F)		 34°C
(93°F)		 34°C
(93°F)		 33°C
(91°F)		 33°C
(92°F)		 26°C
(79°F)		 22°C
(71°F)		 19°C
(67°F)
Mean maximum 12°C
(53°F)		 15°C
(59°F)		 19°C
(66°F)		 22°C
(72°F)		 26°C
(78°F)		 29°C
(84°F)		 33°C
(91°F)		 31°C
(88°F)		 32°C
(90°F)		 25°C
(77°F)		 19°C
(67°F)		 14°C
(57°F)
Average high 4°C
(39°F)		 3°C
(38°F)		 9°C
(48°F)		 13°C
(55°F)		 17°C
(63°F)		 25°C
(77°F)		 27°C
(82°F)		 27°C
(80°F)		 24°C
(76°F)		 15°C
(58°F)		 10°C
(50°F)		 5°C
(42°F)
Daily mean -3°C
(26°F)		 -4°C
(26°F)		 2°C
(35°F)		 5°C
(42°F)		 10°C
(50°F)		 17°C
(63°F)		 20°C
(68°F)		 19°C
(67°F)		 16°C
(61°F)		 7°C
(45°F)		 2°C
(36°F)		 -2°C
(29°F)
Average low -9°C
(16°F)		 -10°C
(15°F)		 -5°C
(24°F)		 -1°C
(30°F)		 3°C
(38°F)		 9°C
(49°F)		 13°C
(55°F)		 12°C
(54°F)		 8°C
(47°F)		 0°C
(33°F)		 -4°C
(26°F)		 -7°C
(19°F)
Mean minimum -20°C
(-5°F)		 -23°C
(-8°F)		 -15°C
(5°F)		 -11°C
(13°F)		 -4°C
(25°F)		 4°C
(39°F)		 8°C
(46°F)		 9°C
(48°F)		 1°C
(35°F)		 -13°C
(9°F)		 -12°C
(11°F)		 -16°C
(3°F)
Minimum -24°C
(-12°F)		 -26°C
(-14°F)		 -21°C
(-5°F)		 -17°C
(2°F)		 -9°C
(17°F)		 3°C
(37°F)		 7°C
(45°F)		 7°C
(45°F)		 -4°C
(25°F)		 -20°C
(-5°F)		 -16°C
(3°F)		 -19°C
(-1°F)

Compare climate in Niwot with other places

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

Monthly average precipitation in Niwot, Colorado, United States §

Niwot usually has the most precipitation in May, June and July, with an average of 15 rainy days and 93 mm (3.7 inches) of precipitation per month. The driest months in Niwot are January, November and December. On average, 25 mm (1.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Niwot, 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) 25 (1.0) 36 (1.4) 62 (2.5) 68 (2.7) 134 (5.3) 74 (2.9) 71 (2.8) 67 (2.7) 42 (1.6) 48 (1.9) 30 (1.2) 19 (0.8)
Average precipitation days (≥ 1 mm) 5 9 11 12 16 14 16 13 8 7 6 4

Monthly sunshine hours in Niwot, Colorado, United States §

The sunniest months in Niwot are June, July and August, when the sun shines an average of 11 hours 59 minutes a day. Least sunny months in Niwot: January, February and December receive an average of 7 hours 14 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Niwot, 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 184 236 287 303 330 373 378 351 309 274 248 237
Mean daily daylight hours 9h 40m 10h 41m 11h 58m 13h 18m 14h 24m 14h 57m 14h 39m 13h 39m 12h 23m 11h 5m 9h 56m 9h 21m

Solar UV radiation in Niwot, Colorado, United States §

Niwot experiences the highest level of ultraviolet (UV) radiation in April, June and July, when the maximum UV index can reach values of 11 - 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 Niwot UV Index data.

Average daily maximum UV levels by month for Niwot, 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 11 12 12 11 10 7 5 4

Detailed Monthly Weather Insights for Niwot, Colorado, United States

Discover in-depth weather details for every month in Niwot. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Niwot's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.

Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.