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Monthly climate in Fort Defiance, Arizona, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Fort Defiance features a cold semi-arid climate (BSk).Temperatures typically range between -2 °C (29 °F) and 23 °C (73 °F) through the year, but rarely can drop to -21 °C (-6 °F) or can rise to as high as 36 °C (97 °F).The average annual precipitation amounts to about 332 mm (13.1 inches) and receives 62 rainy days on the 1 mm (0.04 inches) threshold annually.Fort Defiance enjoys an average of 3641 hours of sunshine throughout the year, and daylight varies from 9 hours 45 minutes to 14 hours 31 minutes per day.

Monthly average temperatures in Fort Defiance, Arizona, United States §

The warmest months in Fort Defiance are June, July and August, with daily mean temperatures ranging from 22 to 23 °C (71 - 73 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -2 to 0 °C (29 - 33 °F) throughout the day. On average each year, Fort Defiance experiences 89 days above 25 °C (77.0 °F) and 123 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Fort Defiance, 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
(57°F)		 17°C
(63°F)		 23°C
(73°F)		 26°C
(79°F)		 30°C
(86°F)		 35°C
(95°F)		 36°C
(97°F)		 33°C
(93°F)		 33°C
(92°F)		 27°C
(81°F)		 20°C
(68°F)		 15°C
(59°F)
Mean maximum 10°C
(50°F)		 13°C
(56°F)		 19°C
(66°F)		 24°C
(75°F)		 28°C
(82°F)		 32°C
(89°F)		 34°C
(93°F)		 32°C
(90°F)		 31°C
(88°F)		 25°C
(76°F)		 18°C
(65°F)		 12°C
(54°F)
Average high 4°C
(40°F)		 7°C
(44°F)		 11°C
(52°F)		 17°C
(63°F)		 22°C
(71°F)		 29°C
(84°F)		 29°C
(84°F)		 29°C
(84°F)		 25°C
(77°F)		 18°C
(65°F)		 13°C
(55°F)		 6°C
(42°F)
Daily mean -2°C
(29°F)		 0°C
(33°F)		 5°C
(40°F)		 10°C
(51°F)		 15°C
(59°F)		 22°C
(71°F)		 23°C
(73°F)		 22°C
(72°F)		 18°C
(65°F)		 11°C
(52°F)		 5°C
(42°F)		 -1°C
(31°F)
Average low -7°C
(20°F)		 -6°C
(22°F)		 -2°C
(29°F)		 3°C
(37°F)		 7°C
(45°F)		 13°C
(56°F)		 16°C
(61°F)		 15°C
(59°F)		 11°C
(52°F)		 4°C
(40°F)		 -1°C
(30°F)		 -6°C
(21°F)
Mean minimum -18°C
(0°F)		 -13°C
(8°F)		 -10°C
(14°F)		 -5°C
(23°F)		 0°C
(33°F)		 7°C
(44°F)		 11°C
(52°F)		 11°C
(53°F)		 4°C
(39°F)		 -6°C
(22°F)		 -9°C
(16°F)		 -14°C
(7°F)
Minimum -21°C
(-6°F)		 -18°C
(1°F)		 -14°C
(6°F)		 -7°C
(20°F)		 -3°C
(28°F)		 4°C
(39°F)		 9°C
(48°F)		 9°C
(48°F)		 0°C
(33°F)		 -12°C
(10°F)		 -12°C
(10°F)		 -18°C
(-1°F)

Compare climate in Fort Defiance with other places

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

Monthly average precipitation in Fort Defiance, Arizona, United States §

Fort Defiance usually has the most precipitation in February, March and July, with an average of 7 rainy days and 42 mm (1.7 inches) of precipitation per month.The driest months in Fort Defiance are April, June and November. On average, 14 mm (0.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Fort Defiance, 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) 31 (1.2) 36 (1.4) 43 (1.7) 16 (0.6) 21 (0.8) 6 (0.2) 48 (1.9) 24 (0.9) 33 (1.3) 26 (1.0) 19 (0.7) 29 (1.2)
Average precipitation days (≥ 1 mm) 6 7 6 4 3 1 10 7 5 5 3 5

Monthly sunshine hours in Fort Defiance, Arizona, United States §

The sunniest months in Fort Defiance are May, June and July, when the sun shines an average of 12 hours 8 minutes a day.Least sunny months in Fort Defiance: January, February and December receive an average of 7 hours 21 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Fort Defiance, 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 192 238 297 330 366 375 375 351 317 294 262 238
Mean daily daylight hours 10h 2m 10h 53m 11h 59m 13h 7m 14h 3m 14h 31m 14h 16m 13h 25m 12h 21m 11h 13m 10h 15m 9h 45m

Solar UV radiation in Fort Defiance, Arizona, United States §

Fort Defiance 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 Fort Defiance UV Index data.

Average daily maximum UV levels by month for Fort Defiance, 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