| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 4.2° | -9.1° | 11.7mm | 4.9 | 25 |
| February | 5.9° | -7.6° | 16.1mm | 5 | 30 |
| March | 11.8° | -3.5° | 25.2mm | 5.8 | 54 |
| April | 16° | 1° | 45.9mm | 8.7 | 68 |
| May | 20.8° | 6° | 66.4mm | 11.2 | 78 |
| June | 26.5° | 10.9° | 60.5mm | 10.1 | 80 |
| July | 32.2° | 14.4° | 29.3mm | 6.5 | 66 |
| August | 31.1° | 13° | 24.9mm | 5.6 | 72 |
| September | 25.8° | 8.2° | 35.4mm | 6.2 | 88 |
| October | 17.3° | 2° | 39.1mm | 7.4 | 77 |
| November | 10.1° | -3.9° | 15.9mm | 5.6 | 48 |
| December | 4.3° | -8.4° | 15.1mm | 4.7 | 25 |
January in Billings averages a daily high of 4.2°C with nights around -9.1°C. Expect roughly 4.9 wet days totalling 11.7mm. A hard month to visit for comfort alone.
February in Billings averages a daily high of 5.9°C with nights around -7.6°C. Expect roughly 5 wet days totalling 16.1mm. A hard month to visit for comfort alone.
March in Billings averages a daily high of 11.8°C with nights around -3.5°C. Expect roughly 5.8 wet days totalling 25.2mm. Demanding conditions — pack for it and plan indoor options.
April in Billings averages a daily high of 16°C with nights around 1°C. Expect roughly 8.7 wet days totalling 45.9mm. Generally workable, with some weather to plan around.
May in Billings averages a daily high of 20.8°C with nights around 6°C. Expect roughly 11.2 wet days totalling 66.4mm. Comfortable conditions for being outdoors all day.
June in Billings averages a daily high of 26.5°C with nights around 10.9°C. Expect roughly 10.1 wet days totalling 60.5mm. Comfortable conditions for being outdoors all day.
July in Billings averages a daily high of 32.2°C with nights around 14.4°C. Expect roughly 6.5 wet days totalling 29.3mm. Generally workable, with some weather to plan around.
August in Billings averages a daily high of 31.1°C with nights around 13°C. Expect roughly 5.6 wet days totalling 24.9mm. Generally workable, with some weather to plan around.
September in Billings averages a daily high of 25.8°C with nights around 8.2°C. Expect roughly 6.2 wet days totalling 35.4mm. Comfortable conditions for being outdoors all day.
October in Billings averages a daily high of 17.3°C with nights around 2°C. Expect roughly 7.4 wet days totalling 39.1mm. Comfortable conditions for being outdoors all day.
November in Billings averages a daily high of 10.1°C with nights around -3.9°C. Expect roughly 5.6 wet days totalling 15.9mm. Demanding conditions — pack for it and plan indoor options.
December in Billings averages a daily high of 4.3°C with nights around -8.4°C. Expect roughly 4.7 wet days totalling 15.1mm. 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. Billings peaks at 88.
Based on 30 years of records, June scores highest for comfort in Billings, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 32.2°C.
May is the wettest, averaging 66.4mm of rain across roughly 11.2 wet days.
January is the coolest month, with average daily highs around 4.2°C.