Flagstaff Climate by Month
Flagstaff, Arizona, United States
Hot summers and cold winters, with rain spread through the year.
Hot summers and cold winters, with rain spread through the year: that's Flagstaff's climate in short. Afternoon highs range from 45°F (7°C) in January to 86°F (30°C) in July, and December nights average 16°F (-9°C). It gets 18 in (459 mm) of rain a year, spread across the months. The air is dry, averaging 41% relative humidity.
- Warmest month
- 86°F(30°C)
- Average high, July
- Coldest nights
- 16°F(-9°C)
- Average low, December
- Rain per year
- 18 in(459 mm)
- No clear rainy season
- Humidity
- 41%
- Sunniest: June
Best and worst months in Flagstaff
Best for weatherThe most comfortable weather comes in May and September, with highs around 75°F (24°C) and about 1.1 in (28 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; January is the coldest, with highs of only 45°F (7°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in May.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Flagstaff weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 45°F(7°C) | 17°F(-8°C) | 1.9 in(48 mm) | 52% | 3.0 |
| FebFebruary | 49°F(9°C) | 20°F(-7°C) | 2.0 in(52 mm) | 45% | 3.7 |
| MarMarch | 55°F(13°C) | 24°F(-4°C) | 1.8 in(46 mm) | 48% | 5.3 |
| AprApril | 63°F(17°C) | 29°F(-1°C) | 0.9 in(23 mm) | 38% | 6.4 |
| MayMayBest | 72°F(22°C) | 36°F(2°C) | 0.6 in(16 mm) | 28% | 7.5 |
| JunJune | 83°F(28°C) | 44°F(7°C) | 0.2 in(6 mm) | 20% | 8.0 |
| JulJuly | 86°F(30°C) | 51°F(11°C) | 2.3 in(59 mm) | 37% | 6.8 |
| AugAugust | 83°F(28°C) | 50°F(10°C) | 2.5 in(64 mm) | 45% | 5.9 |
| SepSeptemberBest | 78°F(25°C) | 43°F(6°C) | 1.6 in(40 mm) | 39% | 5.6 |
| OctOctober | 67°F(19°C) | 33°F(0°C) | 1.2 in(31 mm) | 41% | 4.6 |
| NovNovember | 55°F(13°C) | 24°F(-5°C) | 1.3 in(33 mm) | 49% | 3.4 |
| DecDecember | 45°F(7°C) | 16°F(-9°C) | 1.6 in(41 mm) | 52% | 2.7 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
Places with a similar climate
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