nomadseason

Monthly climate in Nampa, Idaho, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Nampa features a cold semi-arid climate (BSk).Temperatures typically range between 1 °C (34 °F) and 27 °C (82 °F) through the year, but rarely can drop to -24 °C (-10 °F) or can rise to as high as 43 °C (110 °F).The average annual precipitation amounts to about 308 mm (12.1 inches) and receives 65 rainy days on the 1 mm (0.04 inches) threshold annually.Nampa enjoys an average of 3286 hours of sunshine throughout the year, and daylight varies from 9 hours 0 minutes to 15 hours 20 minutes per day.

Monthly average temperatures in Nampa, Idaho, United States §

The warmest months in Nampa are June, July and August, with daily mean temperatures ranging from 22 to 27 °C (72 - 82 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 1 to 3 °C (34 - 37 °F) throughout the day. On average each year, Nampa experiences 104 days above 25 °C (77.0 °F) and 76 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Nampa, Idaho, 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 14°C
(57°F)		 17°C
(63°F)		 27°C
(81°F)		 32°C
(91°F)		 36°C
(98°F)		 41°C
(106°F)		 41°C
(107°F)		 43°C
(110°F)		 39°C
(102°F)		 30°C
(86°F)		 24°C
(76°F)		 15°C
(59°F)
Mean maximum 11°C
(52°F)		 15°C
(60°F)		 23°C
(74°F)		 29°C
(84°F)		 33°C
(91°F)		 34°C
(94°F)		 40°C
(105°F)		 40°C
(104°F)		 37°C
(98°F)		 27°C
(80°F)		 20°C
(68°F)		 13°C
(55°F)
Average high 5°C
(41°F)		 8°C
(46°F)		 14°C
(58°F)		 18°C
(65°F)		 23°C
(74°F)		 29°C
(84°F)		 35°C
(96°F)		 34°C
(93°F)		 28°C
(82°F)		 18°C
(65°F)		 11°C
(53°F)		 5°C
(42°F)
Daily mean 1°C
(34°F)		 3°C
(37°F)		 8°C
(47°F)		 12°C
(54°F)		 16°C
(62°F)		 22°C
(72°F)		 27°C
(82°F)		 26°C
(79°F)		 20°C
(68°F)		 12°C
(53°F)		 6°C
(43°F)		 2°C
(35°F)
Average low -2°C
(28°F)		 -1°C
(30°F)		 3°C
(37°F)		 6°C
(42°F)		 10°C
(50°F)		 14°C
(58°F)		 19°C
(66°F)		 18°C
(65°F)		 13°C
(55°F)		 6°C
(43°F)		 2°C
(35°F)		 -2°C
(29°F)
Mean minimum -12°C
(11°F)		 -8°C
(18°F)		 -4°C
(25°F)		 -1°C
(30°F)		 3°C
(38°F)		 8°C
(46°F)		 14°C
(57°F)		 12°C
(54°F)		 6°C
(43°F)		 -3°C
(27°F)		 -5°C
(24°F)		 -7°C
(19°F)
Minimum -24°C
(-10°F)		 -10°C
(14°F)		 -9°C
(16°F)		 -3°C
(28°F)		 1°C
(34°F)		 7°C
(44°F)		 11°C
(51°F)		 9°C
(49°F)		 4°C
(40°F)		 -10°C
(14°F)		 -6°C
(21°F)		 -9°C
(16°F)

Compare climate in Nampa with other places

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

Monthly average precipitation in Nampa, Idaho, United States §

Nampa usually has the most precipitation in January, February and December, with an average of 9 rainy days and 40 mm (1.6 inches) of precipitation per month.The driest months in Nampa are July, August and September. On average, 6 mm (0.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Nampa, Idaho, 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) 43 (1.7) 41 (1.6) 34 (1.3) 34 (1.3) 35 (1.4) 19 (0.7) 1 (0.1) 7 (0.3) 10 (0.4) 21 (0.8) 29 (1.1) 35 (1.4)
Average precipitation days (≥ 1 mm) 9 10 9 6 6 3 0 1 2 3 7 9

Monthly sunshine hours in Nampa, Idaho, United States §

The sunniest months in Nampa are June, July and August, when the sun shines an average of 12 hours 19 minutes a day.Least sunny months in Nampa: January, February and December receive an average of 5 hours 19 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Nampa, Idaho, 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 136 180 261 296 344 372 400 360 309 254 203 167
Mean daily daylight hours 9h 22m 10h 31m 11h 58m 13h 27m 14h 42m 15h 20m 14h 59m 13h 51m 12h 26m 10h 57m 9h 39m 9h 0m

Solar UV radiation in Nampa, Idaho, United States §

Nampa experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme 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 4. For more detailed information, check out our hourly Nampa UV Index data.

Average daily maximum UV levels by month for Nampa, Idaho, 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) 3 5 6 8 10 11 11 9 8 6 4 2