Flagstaff Temperatures: Averages by Month





The numbers here tell you how hot and cold the weather usually is in Flagstaff, Arizona during each month of the year.

The average high and low temperatures are listed below by month and annually for Flagstaff, in both degrees Fahrenheit and Celsius.

Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.

To find out how often it rises over 60, 70 or 80 °F each month in Flagstaff, scroll down farther. There are also monthly and yearly counts of days with cold weather.

The first set of high and low temperatures are averages for 2010 to 2019. Everything else here is based on 1981 to 2010 weather.

10-year temperature averages for Flagstaff, 2010 to 2019
High °F Low °F   High °C Low °C
44 18 January 7 -8
46 19 February 8 -7
54 24 March 12 -4
60 29 April 16 -2
66 33 May 19 1
81 44 June 27 7
81 52 July 27 11
79 51 August 26 10
74 43 September 23 6
64 33 October 18 0
52 23 November 11 -5
43 18 December 6 -8
62 33 Year 17 0
30-year temperature averages for Flagstaff, 1981 to 2010
High °F Low °F   High °C Low °C
43 17 January 6 -8
45 19 February 7 -7
50 24 March 10 -5
58 29 April 15 -2
68 35 May 20 2
78 42 June 26 6
81 51 July 27 11
78 50 August 26 10
73 42 September 23 6
62 32 October 17 0
51 23 November 10 -5
43 17 December 6 -8
61 32 Year 16 0

Days With Warm Weather in Flagstaff

It seldom gets extremely hot in Flagstaff. On only one or two days a year does the temperature climb over 89 °F. Temperatures above 80 can occur from May to September.

Days per month in Flagstaff of at least 60, 70 or 80 °F
  60 °F
16 °C
70 °F
21 °C
80 °F
27 °C
January 0 0 0
February 1 0 0
March 5 0 0
April 15 3 0
May 26 14 2
June 30 26 12
July 31 30 19
August 31 29 13
September 29 21 4
October 20 6 0
November 5 0 0
December 0 0 0
Year 192 129 50

Days of Cold Temperatures

Even on warmest days of the year, Flagstaff's minimum temperatures almost always go below 60°F. During all months but July and August, the daily lows can drop to freezing.

Really cold temperatures occur on an average of four days during winter, when the day's low registers 0 °F or less. The temperature doesn't reach above freezing during a few days each month from November to February.

Average number of days monthly in Flagstaff with temperature below 10, 20, or 32 °F
  10 °F
-12 °C
20 °F
-8 °C
32 °F
0 °C
January 6 19 30
February 4 14 27
March 1 7 29
April 0 2 23
May 0 0 10
June 0 0 2
July 0 0 0
August 0 0 0
September 0 0 2
October 0 1 17
November 2 9 28
December 7 19 30
Year 20 71 197
References

Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Month and Year, Version 1.0. NOAA National Centers for Environmental Information.

NOAA National Centers for Environmental Information. 1981-2010 U.S. Climate Normals. (Data Access. FTP.)

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