Flagstaff Average Rainfall by Month

This page shows the average precipitation (including snowfall) in each month of the year in Flagstaff, Arizona. It is based on NOAA data for the years 1991–2020.

Average temperature by month

What's the Rainiest Month in Flagstaff?

In Flagstaff, August has the greatest precipitation of any month. On average, Flagstaff gets 3.0 inches of precipitation in August.

August is also the month where rain is most common. 42.9% of days in August will have at least some rain.

What's the Driest Month in Flagstaff?

In Flagstaff, June has the least precipitation of any month. On average, Flagstaff gets 0.31 inches of precipitation in June.

June is also the month where rain is least common. Only 7.5% of days in June will have measurable rain.

Month	Precipitation	% Chance
January	2.05 in	22.5
February	2.17 in	26.8
March	1.88 in	21.8
April	0.89 in	16.2
May	0.77 in	14.5
June	0.31 in	7.5
July	2.60 in	38.6
August	3.04 in	42.9
September	1.82 in	25.1
October	1.52 in	17.1
November	1.53 in	14.4
December	1.90 in	21.7
Year	20.45 in	22.5

Weather Station Details

Years	Station	Coordinates
1893–2024	Flagstaff Pulliam Airport	location