| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 6.2° | -8° | 50.5mm | 6.9 | 27 |
| February | 7.4° | -7.1° | 47.3mm | 7 | 32 |
| March | 11.1° | -4.5° | 47.3mm | 6.9 | 48 |
| April | 15.1° | -2.1° | 21mm | 4.9 | 68 |
| May | 20.1° | 1.4° | 16.2mm | 3.7 | 92 |
| June | 26.3° | 6.1° | 9mm | 2.5 | 95 |
| July | 27.9° | 11.1° | 71.1mm | 12.4 | 72 |
| August | 26.2° | 10.5° | 77mm | 13.3 | 73 |
| September | 23.4° | 6.1° | 44.7mm | 7.7 | 85 |
| October | 17.6° | -0.1° | 37.1mm | 5.3 | 79 |
| November | 11.6° | -4.8° | 32.2mm | 4 | 55 |
| December | 6.5° | -8.1° | 44.6mm | 6.5 | 29 |
January in Flagstaff averages a daily high of 6.2°C with nights around -8°C. Expect roughly 6.9 wet days totalling 50.5mm. A hard month to visit for comfort alone.
February in Flagstaff averages a daily high of 7.4°C with nights around -7.1°C. Expect roughly 7 wet days totalling 47.3mm. A hard month to visit for comfort alone.
March in Flagstaff averages a daily high of 11.1°C with nights around -4.5°C. Expect roughly 6.9 wet days totalling 47.3mm. Demanding conditions — pack for it and plan indoor options.
April in Flagstaff averages a daily high of 15.1°C with nights around -2.1°C. Expect roughly 4.9 wet days totalling 21mm. Generally workable, with some weather to plan around.
May in Flagstaff averages a daily high of 20.1°C with nights around 1.4°C. Expect roughly 3.7 wet days totalling 16.2mm. Comfortable conditions for being outdoors all day.
June in Flagstaff averages a daily high of 26.3°C with nights around 6.1°C. Rain is rare — about 2.5 wet days and 9mm across the month. Comfortable conditions for being outdoors all day.
July in Flagstaff averages a daily high of 27.9°C with nights around 11.1°C. Expect roughly 12.4 wet days totalling 71.1mm. Generally workable, with some weather to plan around.
August in Flagstaff averages a daily high of 26.2°C with nights around 10.5°C. Expect roughly 13.3 wet days totalling 77mm. Generally workable, with some weather to plan around.
September in Flagstaff averages a daily high of 23.4°C with nights around 6.1°C. Expect roughly 7.7 wet days totalling 44.7mm. Comfortable conditions for being outdoors all day.
October in Flagstaff averages a daily high of 17.6°C with nights around -0.1°C. Expect roughly 5.3 wet days totalling 37.1mm. Comfortable conditions for being outdoors all day.
November in Flagstaff averages a daily high of 11.6°C with nights around -4.8°C. Expect roughly 4 wet days totalling 32.2mm. Generally workable, with some weather to plan around.
December in Flagstaff averages a daily high of 6.5°C with nights around -8.1°C. Expect roughly 6.5 wet days totalling 44.6mm. A hard month to visit for comfort alone.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Flagstaff peaks at 95.
Based on 30 years of records, May–June scores highest for comfort in Flagstaff, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 27.9°C.
August is the wettest, averaging 77mm of rain across roughly 13.3 wet days.
January is the coolest month, with average daily highs around 6.2°C.