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Monthly climate in Flagstaff, Arizona, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Flagstaff features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 0 °C (32 °F) and 21 °C (70 °F) through the year, but rarely can drop to -20 °C (-4 °F) or can rise to as high as 35 °C (95 °F).The average annual precipitation amounts to about 588 mm (23.2 inches) and receives 85 rainy days on the 1 mm (0.04 inches) threshold annually.Flagstaff enjoys an average of 3620 hours of sunshine throughout the year, and daylight varies from 9 hours 48 minutes to 14 hours 28 minutes per day.

Monthly average temperatures in Flagstaff, Arizona, United States §

The warmest months in Flagstaff are June, July and August, with daily mean temperatures ranging from 20 to 21 °C (69 - 70 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 0 to 1 °C (32 - 34 °F) throughout the day. On average each year, Flagstaff experiences 75 days above 25 °C (77.0 °F) and 120 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Flagstaff, Arizona, 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
(58°F)		 17°C
(63°F)		 20°C
(69°F)		 26°C
(79°F)		 30°C
(86°F)		 35°C
(95°F)		 35°C
(95°F)		 33°C
(92°F)		 33°C
(91°F)		 26°C
(80°F)		 20°C
(69°F)		 16°C
(62°F)
Mean maximum 12°C
(53°F)		 14°C
(57°F)		 18°C
(64°F)		 22°C
(73°F)		 26°C
(80°F)		 31°C
(88°F)		 33°C
(91°F)		 31°C
(87°F)		 29°C
(85°F)		 23°C
(73°F)		 19°C
(66°F)		 14°C
(57°F)
Average high 5°C
(42°F)		 7°C
(44°F)		 10°C
(50°F)		 16°C
(61°F)		 20°C
(68°F)		 27°C
(81°F)		 27°C
(82°F)		 27°C
(81°F)		 24°C
(75°F)		 17°C
(64°F)		 12°C
(55°F)		 6°C
(44°F)
Daily mean -0°C
(32°F)		 1°C
(34°F)		 4°C
(39°F)		 9°C
(49°F)		 13°C
(57°F)		 20°C
(69°F)		 21°C
(70°F)		 20°C
(69°F)		 17°C
(63°F)		 11°C
(51°F)		 6°C
(42°F)		 1°C
(33°F)
Average low -5°C
(23°F)		 -5°C
(24°F)		 -2°C
(29°F)		 2°C
(36°F)		 6°C
(42°F)		 12°C
(54°F)		 15°C
(59°F)		 14°C
(57°F)		 11°C
(51°F)		 4°C
(40°F)		 0°C
(32°F)		 -4°C
(25°F)
Mean minimum -14°C
(7°F)		 -14°C
(7°F)		 -10°C
(14°F)		 -4°C
(24°F)		 -1°C
(30°F)		 6°C
(43°F)		 11°C
(51°F)		 10°C
(51°F)		 4°C
(40°F)		 -5°C
(24°F)		 -8°C
(18°F)		 -12°C
(10°F)
Minimum -18°C
(0°F)		 -19°C
(-2°F)		 -14°C
(8°F)		 -7°C
(20°F)		 -3°C
(27°F)		 3°C
(37°F)		 9°C
(48°F)		 9°C
(48°F)		 -1°C
(31°F)		 -8°C
(17°F)		 -16°C
(4°F)		 -20°C
(-4°F)

Compare climate in Flagstaff with other places

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

Monthly average precipitation in Flagstaff, Arizona, United States §

Flagstaff usually has the most precipitation in March, July and August, with an average of 12 rainy days and 93 mm (3.6 inches) of precipitation per month.The driest months in Flagstaff are April, June and November. On average, 21 mm (0.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Flagstaff, Arizona, 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) 47 (1.8) 50 (2.0) 61 (2.4) 22 (0.9) 32 (1.3) 11 (0.4) 148 (5.8) 69 (2.7) 49 (1.9) 34 (1.4) 30 (1.2) 36 (1.4)
Average precipitation days (≥ 1 mm) 7 7 9 4 6 2 16 13 7 5 3 6

Monthly sunshine hours in Flagstaff, Arizona, United States §

The sunniest months in Flagstaff are May, June and July, when the sun shines an average of 12 hours 3 minutes a day.Least sunny months in Flagstaff: January, February and December receive an average of 7 hours 16 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Flagstaff, Arizona, 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 188 241 300 330 373 375 360 347 316 294 257 232
Mean daily daylight hours 10h 4m 10h 55m 11h 59m 13h 6m 14h 1m 14h 28m 14h 13m 13h 24m 12h 20m 11h 14m 10h 17m 9h 48m

Solar UV radiation in Flagstaff, Arizona, United States §

Flagstaff experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 12 - 13, which corresponds to the Extreme category of sun exposure.January, November and December are in the Moderate / High exposure category. In these months, the maximum values of the UV index do not exceed 6. For more detailed information, check out our hourly Flagstaff UV Index data.

Average daily maximum UV levels by month for Flagstaff, Arizona, 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) 5 8 9 11 12 13 13 12 11 8 6 4