Climate averages 1991–2020
Flagstaff weather
in January.
A cold, moderately wet month: one of the coolest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cold month in Flagstaff: daytime highs average 5.7°C and nights cool to about -3.8°C. By daytime temperature it is one of the coolest months of the year.
Expect about 47 mm of rain on roughly 6 days, which makes January a moderately wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 04 min on an average January day.
The nearest other city in this atlas is Surprise (185 km away). In January its highs average 18.3°C, 12.7°C warmer than Flagstaff, with 35 mm of rain.
Among the 498 cities listed in the United States, Flagstaff ranks joint 308th of 498 for the warmest January highs and joint 106th of 498 for the driest January (rainfall, lowest first). The mean January high of those 498 cities is 9.5°C; Flagstaff is 3.8°C cooler than that mean.
From January to February, average highs rise by 1.4°C to 7.0°C, and monthly rainfall rises from 47 mm to 50 mm.
The annual picture
January in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Flagstaff climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 5.7°C-3.8°C | -3.8°C | 47 | 6.3 | 10.110 h |
| February | 7.0°C-3.0°C | -3.0°C | 50 | 6.9 | 10.911 h |
| March | 10.7°C-0.3°C | -0.3°C | 49 | 7.3 | 11.912 h |
| April | 15.0°C2.8°C | 2.8°C | 31 | 5.6 | 13.113 h |
| May | 20.5°C7.7°C | 7.7°C | 32 | 5.7 | 14.014 h |
| June | 26.8°C13.2°C | 13.2°C | 11 | 3.0 | 14.514 h |
| July | 27.9°C15.9°C | 15.9°C | 115 | 14.7 | 14.314 h |
| August | 26.2°C15.2°C | 15.2°C | 126 | 16.3 | 13.513 h |
| September | 23.3°C12.4°C | 12.4°C | 57 | 8.8 | 12.412 h |
| October | 17.7°C6.9°C | 6.9°C | 33 | 5.2 | 11.311 h |
| November | 11.2°C1.0°C | 1.0°C | 32 | 4.1 | 10.410 h |
| December | 5.7°C-3.6°C | -3.6°C | 41 | 5.8 | 9.810 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
January in nearby cities
- Surprise in JanuaryUnited States · 185 kmHigh 18.3°C · Low 5.0°C · 35 mm rain
- Peoria (Arizona), United States in JanuaryUnited States · 188 kmHigh 18.4°C · Low 5.1°C · 28 mm rain
- Scottsdale in JanuaryUnited States · 189 kmHigh 18.4°C · Low 4.7°C · 32 mm rain
- Glendale (Arizona), United States in JanuaryUnited States · 191 kmHigh 18.5°C · Low 4.9°C · 28 mm rain
- Mesa in JanuaryUnited States · 198 kmHigh 18.5°C · Low 4.3°C · 40 mm rain
- Phoenix in JanuaryUnited States · 198 kmHigh 18.6°C · Low 4.6°C · 32 mm rain
- Tempe in JanuaryUnited States · 200 kmHigh 18.6°C · Low 4.4°C · 32 mm rain
- Avondale in JanuaryUnited States · 206 kmHigh 19.0°C · Low 5.0°C · 28 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Flagstaff) is explained once on the Flagstaff year overview and on the Sources, method and limits page.