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Monthly climate in Caldwell, Idaho, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Caldwell features a cold semi-arid climate (BSk).Temperatures typically range between 1 °C (34 °F) and 28 °C (82 °F) through the year, but rarely can drop to -26 °C (-15 °F) or can rise to as high as 43 °C (111 °F).The average annual precipitation amounts to about 284 mm (11.2 inches) and receives 65 rainy days on the 1 mm (0.04 inches) threshold annually.Caldwell enjoys an average of 3266 hours of sunshine throughout the year, and daylight varies from 8 hours 57 minutes to 15 hours 22 minutes per day.

Monthly average temperatures in Caldwell, Idaho, United States §

The warmest months in Caldwell are June, July and August, with daily mean temperatures ranging from 22 to 28 °C (73 - 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, Caldwell experiences 108 days above 25 °C (77.0 °F) and 78 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Caldwell, 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 15°C
(59°F)		 18°C
(65°F)		 27°C
(81°F)		 33°C
(91°F)		 37°C
(99°F)		 42°C
(108°F)		 42°C
(108°F)		 43°C
(111°F)		 39°C
(103°F)		 30°C
(86°F)		 25°C
(77°F)		 16°C
(60°F)
Mean maximum 11°C
(52°F)		 15°C
(60°F)		 23°C
(74°F)		 29°C
(84°F)		 33°C
(92°F)		 35°C
(95°F)		 40°C
(105°F)		 41°C
(105°F)		 37°C
(98°F)		 27°C
(80°F)		 20°C
(68°F)		 13°C
(56°F)
Average high 5°C
(41°F)		 8°C
(46°F)		 15°C
(59°F)		 19°C
(66°F)		 24°C
(75°F)		 30°C
(85°F)		 36°C
(97°F)		 34°C
(94°F)		 28°C
(82°F)		 19°C
(66°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)		 17°C
(63°F)		 22°C
(73°F)		 28°C
(82°F)		 26°C
(80°F)		 20°C
(68°F)		 12°C
(54°F)		 6°C
(43°F)		 2°C
(35°F)
Average low -3°C
(28°F)		 -1°C
(30°F)		 3°C
(37°F)		 6°C
(43°F)		 10°C
(51°F)		 15°C
(59°F)		 19°C
(66°F)		 18°C
(65°F)		 12°C
(55°F)		 6°C
(43°F)		 1°C
(35°F)		 -2°C
(29°F)
Mean minimum -12°C
(10°F)		 -8°C
(18°F)		 -3°C
(26°F)		 -1°C
(31°F)		 4°C
(39°F)		 8°C
(47°F)		 14°C
(57°F)		 12°C
(54°F)		 6°C
(43°F)		 -2°C
(28°F)		 -5°C
(23°F)		 -7°C
(19°F)
Minimum -26°C
(-15°F)		 -11°C
(13°F)		 -7°C
(20°F)		 -3°C
(27°F)		 1°C
(34°F)		 7°C
(46°F)		 10°C
(51°F)		 9°C
(49°F)		 5°C
(41°F)		 -9°C
(16°F)		 -7°C
(20°F)		 -9°C
(16°F)

Compare climate in Caldwell with other places

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

Monthly average precipitation in Caldwell, Idaho, United States §

Caldwell usually has the most precipitation in January, February and December, with an average of 9 rainy days and 39 mm (1.5 inches) of precipitation per month.The driest months in Caldwell are July, August and September. On average, 5 mm (0.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Caldwell, 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) 42 (1.7) 43 (1.7) 31 (1.2) 29 (1.2) 28 (1.1) 16 (0.6) 1 (0.0) 5 (0.2) 9 (0.4) 18 (0.7) 28 (1.1) 33 (1.3)
Average precipitation days (≥ 1 mm) 9 10 8 6 7 3 0 1 2 3 7 9

Monthly sunshine hours in Caldwell, Idaho, United States §

The sunniest months in Caldwell are June, July and August, when the sun shines an average of 12 hours 13 minutes a day.Least sunny months in Caldwell: January, February and December receive an average of 5 hours 20 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Caldwell, 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 136 182 259 292 340 369 398 357 308 253 201 166
Mean daily daylight hours 9h 20m 10h 30m 11h 58m 13h 28m 14h 44m 15h 22m 15h 1m 13h 53m 12h 26m 10h 56m 9h 38m 8h 57m

Solar UV radiation in Caldwell, Idaho, United States §

Caldwell 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, February 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 Caldwell UV Index data.

Average daily maximum UV levels by month for Caldwell, 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 4 6 8 10 11 10 9 8 5 4 2