Climate averages 1991–2020
Billings weather
by month.
See how the year changes. July has the highest average daily maximum; August has the lowest average monthly rainfall.
Pleasant-weather months by our simple rule: September
Long-term climate patterns, not a forecast for a particular trip.
Across the year Billings averages a daytime high of 15.1°C and a nighttime low of 3.0°C, with about 417 mm of rain on roughly 82 days. July is the warmest month (average high 30.7°C) and January the coolest (1.3°C). May is the wettest month with 65 mm; August is the driest with 18 mm.
Months with pleasant weather by a simple rule (average high between 18°C and 29°C, average low of at least 5°C and at most 8 rain days): September. This looks at temperature and rain only, not humidity, wind, sea temperature or crowds.
The annual picture
A year in Billings
Monthly precipitation
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
Billings climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 1.3°C-8.8°C | -8.8°C | 22 | 5.7 | 9.19 h |
| February | 3.5°C-7.6°C | -7.6°C | 20 | 6.1 | 10.310 h |
| March | 9.4°C-3.2°C | -3.2°C | 31 | 7.1 | 11.912 h |
| April | 13.9°C1.2°C | 1.2°C | 59 | 10.8 | 13.514 h |
| May | 19.6°C7.0°C | 7.0°C | 65 | 10.7 | 14.915 h |
| June | 24.9°C12.0°C | 12.0°C | 53 | 9.0 | 15.716 h |
| July | 30.7°C16.6°C | 16.6°C | 24 | 4.8 | 15.315 h |
| August | 30.0°C15.8°C | 15.8°C | 18 | 3.9 | 14.114 h |
| September | 23.7°C10.4°C | 10.4°C | 35 | 5.5 | 12.613 h |
| October | 15.1°C3.3°C | 3.3°C | 46 | 7.2 | 11.011 h |
| November | 7.4°C-3.0°C | -3.0°C | 23 | 5.9 | 9.510 h |
| December | 1.8°C-7.5°C | -7.5°C | 20 | 5.5 | 8.79 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet 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
Nearby cities
- MissoulaUnited States · 439 kmHigh 13.4°C · Low 3.1°C · 508 mm rain a year
- Rapid CityUnited States · 456 kmHigh 14.7°C · Low 3.4°C · 628 mm rain a year
- LethbridgeCanada · 542 kmHigh 11.9°C · Low 1.4°C · 411 mm precipitation a year
- OgdenUnited States · 579 kmHigh 15.4°C · Low 3.8°C · 503 mm rain a year
- ReginaCanada · 593 kmHigh 8.4°C · Low -1.4°C · 492 mm precipitation a year
- LaytonUnited States · 595 kmHigh 15.2°C · Low 3.8°C · 474 mm rain a year
- BismarckUnited States · 603 kmHigh 11.4°C · Low 1.4°C · 541 mm precipitation a year
- Salt Lake CityUnited States · 622 kmHigh 16.1°C · Low 4.4°C · 492 mm rain a year
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 limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC-7, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at 45.80°, -108.50° (2 km from the city centre), adjusted up by 0.3°C for the difference between the city's elevation (954 m) and the cell's (995 m). Rain comes from the 0.25° cell at 45.75°, -108.50°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.