Flagstaff Climate
Flagstaff has a highland semi-arid climate with four distinct seasons. The combination of highaltitude and low humidity provide mild weather conditions throughout most of the year, and the predominantly clear air radiates daytime heating effectively.
Temperatures often fall precipitously after sunset throughout the year, and winter nights can be very cold.
Despite being less than 150 miles from Phoenix, the average temperatures are approximately 25 °F (14 °C) cooler, due to its higher elevation.
Winter weather patterns in Flagstaff are cyclonic and frontal in nature, originating in the eastern Pacific Ocean. These deliver periodic, widespread snowfall followed by extended periods of fair weather. The area's generally stable weather pattern is broken by brief, but often intense, afternoon downpours and dramatic thunderstorms common during the so-called monsoon of July and August.
Summer temperatures are moderate and high temperatures average around 80 °F (27 °C). The record high temperature is 97.0 °F on July 5, 1973, and the record low temperature was -30 °F on January 22, 1937.
The average annual precipitation is 22.91 inches and annual snowfall averages 100.3 inches (254 cm), placing Flagstaff among the snowiest incorporated cities in the United States.
Overall, the city enjoys an average of 283 days without precipitation each year, and the climate is officially classified as "semi-arid."
Although snow often covers the ground for weeks after major winter storms, Flagstaff's relatively low latitude and plentiful winter sunshine quickly melt much of what falls, and persistent deep snowpack is unusual.
During the week of January 18 - 23, 2010, Flagstaff experienced the storm total snowfall of 54.2 inches ranks as the 2nd highest storm snowfall in Flagstaff history.
Check Out Flagstaff Weather Events
Average daily temperatures
| High | Low | |||
|---|---|---|---|---|
| Month | °F |
°C |
°F | °C |
| Jan | 43 | 6 | 16 | -9 |
| Feb | 46 | 8 | 19 | -7 |
| Mar | 50 | 10 | 23 | -5 |
| Apr | 58 | 14 | 27 | -3 |
| May | 68 | 20 | 34 | 1 |
| Jun | 79 | 26 | 41 | 5 |
| Jul | 82 | 28 | 50 | 10 |
| Aug | 80 | 27 | 49 | 9 |
| Sep | 74 | 23 | 42 | 5 |
| Oct | 63 | 17 | 31 | -1 |
| Nov | 51 | 11 | 22 | -6 |
| Dec | 44 | 7 | 17 | -8 |
Average Monthly precipitation
| Month | inches | cm |
|---|---|---|
| Jan | 2.18 | 5.54 |
| Feb | 2.56 | 6.50 |
| Mar | 2.62 | 6.65 |
| Apr | 1.29 | 3.28 |
| May | 0.80 | 2.03 |
| Jun | 0.43 | 1.09 |
| Jul | 2.40 | 6.10 |
| Aug | 2.89 | 7.34 |
| Sep | 2.12 | 5.38 |
| Oct | 1.93 | 4.90 |
| Nov | 1.86 | 4.72 |
| Dec | 1.83 | 4.65 |
Average sunrise / sunset times
| Month | Sunrise | Sunset |
|---|---|---|
| Jan | 7:35 | 5:26 |
| Feb | 7:26 | 5:55 |
| Mar | 6:57 | 6:22 |
| Apr | 6:14 | 6:48 |
| May | 5:36 | 7:12 |
| Jun | 5:14 | 7:36 |
| Jul | 5:16 | 7:45 |
| Aug | 5:36 | 7:30 |
| Sep | 5:59 | 6:54 |
| Oct | 6:21 | 6:11 |
| Nov | 6:48 | 5:32 |
| Dec | 7:17 | 5:15 |
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