What is the hottest month in Flagstaff?

July is the warmest month in Flagstaff, with an average high of 82.0°F.

What is the coldest month in Flagstaff?

December is the coldest month in Flagstaff, with an average low of 16.9°F.

What month does Flagstaff get the most rain?

August is typically the wettest month in Flagstaff, with about 3.04 inches of precipitation.

What plant hardiness zone is Flagstaff in?

Flagstaff is approximately in USDA plant hardiness Zone 7a, based on the average annual extreme minimum temperature.

Has the climate in Flagstaff changed recently?

21.6% of Flagstaff's all-time daily heat records were set in the last decade (since 2015), compared to roughly 5% if records were evenly distributed over time.

Flagstaff, AZ

Climate overview — based on NOAA 1991-2020 normals from FLAGSTAFF PULLIAM AP, AZ US.

Dsb Mediterranean continental (warm summer) climate 7a USDA hardiness Zone 7a

Year-round temperatures (°F)

Avg high Avg low

Climate summary

Flagstaff has an annual average temperature of 46.8°F with about 20.5 inches of precipitation per year and 90.1 inches of snow. The warmest month is July (average high 82.0°F), and the coldest is December (average low 16.9°F). August is typically the wettest month (3.04 in) and June the driest (0.30 in). Snow typically falls from October through May.

Pleasant months

1 / 12

avg high 65–80°F, low ≥ 50°F

Annual swing

36.7°F

warmest to coldest month

Heating need

6,594

HDD/yr

Cooling need

CDD/yr

Best time to visit Flagstaff

Full guide →

Climate change signal

All-time records →

79 of 366 (21.6%) of Flagstaff's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.

1890s		46
1900s		1
1920s		8
1930s		26
1940s		10
1950s		28
1960s		13
1970s		48
1980s		52
1990s		21
2000s		27
2010s		27
2020s		59

Bars: number of all-time daily heat records still standing that were set in each decade.

Monthly averages

Month	Avg High	Avg Low	Avg Temp	Precipitation	Snow	Rainy days
January	43.4°F	17.6°F	30.5°F	2.05 in	20.9 in	7
February	45.7°F	19.6°F	32.6°F	2.17 in	19.3 in	8
March	52.2°F	23.8°F	38.0°F	1.88 in	15.6 in	7
April	59.2°F	28.2°F	43.7°F	0.89 in	5.0 in	5
May	68.1°F	34.6°F	51.3°F	0.77 in	1.1 in	5
June	79.1°F	42.5°F	60.8°F	0.30 in	—	2
July	82.0°F	51.4°F	66.7°F	2.61 in	—	12
August	79.3°F	50.6°F	64.9°F	3.04 in	—	13
September	74.1°F	42.5°F	58.3°F	1.84 in	—	8
October	63.6°F	31.5°F	47.6°F	1.52 in	1.5 in	5
November	52.1°F	23.0°F	37.5°F	1.55 in	8.2 in	4
December	43.0°F	16.9°F	30.0°F	1.90 in	18.5 in	7