Warm-summer humid continental climate
Climate Lewistown - Montana
Annual high55ºF
Annual low31ºF
Precipitation16.85 inch
| Month | HighºF | LowºF | Precipinch | Snowinch |
|---|---|---|---|---|
| Jan | 34 | 13 | 0.57 | 10 |
| Feb | 37 | 15 | 0.44 | 5 |
| Mar | 44 | 22 | 0.99 | 12 |
| Apr | 54 | 29 | 1.41 | 8 |
| May | 62 | 38 | 2.85 | 5 |
| Jun | 71 | 45 | 3.08 | 0 |
| Jul | 81 | 50 | 1.93 | 0 |
| Aug | 81 | 49 | 1.73 | 0 |
| Sep | 69 | 41 | 1.35 | 2 |
| Oct | 57 | 31 | 1.13 | 4 |
| Nov | 43 | 21 | 0.71 | 8 |
| Dec | 34 | 13 | 0.66 | 10 |
- JanHigh 34ºFLow 13ºFPrecip 0.57 inch
- FebHigh 37ºFLow 15ºFPrecip 0.44 inch
- MarHigh 44ºFLow 22ºFPrecip 0.99 inch
- AprHigh 54ºFLow 29ºFPrecip 1.41 inch
- MayHigh 62ºFLow 38ºFPrecip 2.85 inch
- JunHigh 71ºFLow 45ºFPrecip 3.08 inch
- JulHigh 81ºFLow 50ºFPrecip 1.93 inch
- AugHigh 81ºFLow 49ºFPrecip 1.73 inch
- SepHigh 69ºFLow 41ºFPrecip 1.35 inch
- OctHigh 57ºFLow 31ºFPrecip 1.13 inch
- NovHigh 43ºFLow 21ºFPrecip 0.71 inch
- DecHigh 34ºFLow 13ºFPrecip 0.66 inch
Climate summary
What is the average weather in Lewistown, Montana?
Lewistown experiences a humid continental climate, marked by very large seasonal temperature contrasts. Summers are warm and bring the most precipitation, while winters are cold and very snowy. Despite the summer moisture, annual precipitation is low, with winter moisture often arriving as snow.
Lewistown weather averages
Annual high55ºF
Annual low31ºF
Precipitation16.85 inch
Snowfall64 inch
Daily normals Lewistown - Montana - January
| Day | HighºF | LowºF | Prec/ | Prec/ |
|---|---|---|---|---|
| Jan 1 | 34.1 | 12.2 | 0.02 | 0.02 |
| Jan 2 | 34.1 | 12.3 | 0.04 | 0.04 |
| Jan 3 | 34.2 | 12.3 | 0.06 | 0.06 |
| Jan 4 | 34.2 | 12.4 | 0.07 | 0.07 |
| Jan 5 | 34.3 | 12.4 | 0.09 | 0.09 |
| Jan 6 | 34.3 | 12.5 | 0.11 | 0.11 |
| Jan 7 | 34.4 | 12.5 | 0.13 | 0.13 |
| Jan 8 | 34.4 | 12.6 | 0.15 | 0.15 |
| Jan 9 | 34.4 | 12.6 | 0.17 | 0.17 |
| Jan 10 | 34.5 | 12.7 | 0.19 | 0.19 |
| Jan 11 | 34.5 | 12.8 | 0.21 | 0.21 |
| Jan 12 | 34.5 | 12.8 | 0.23 | 0.23 |
| Jan 13 | 34.6 | 12.9 | 0.25 | 0.25 |
| Jan 14 | 34.6 | 12.9 | 0.27 | 0.27 |
| Jan 15 | 34.6 | 13.0 | 0.29 | 0.29 |
| Jan 16 | 34.6 | 13.0 | 0.31 | 0.31 |
| Jan 17 | 34.6 | 13.1 | 0.32 | 0.32 |
| Jan 18 | 34.6 | 13.1 | 0.34 | 0.34 |
| Jan 19 | 34.6 | 13.1 | 0.36 | 0.36 |
| Jan 20 | 34.6 | 13.2 | 0.38 | 0.38 |
| Jan 21 | 34.5 | 13.2 | 0.40 | 0.40 |
| Jan 22 | 34.5 | 13.2 | 0.42 | 0.42 |
| Jan 23 | 34.5 | 13.2 | 0.43 | 0.43 |
| Jan 24 | 34.4 | 13.2 | 0.45 | 0.45 |
| Jan 25 | 34.4 | 13.2 | 0.47 | 0.47 |
| Jan 26 | 34.4 | 13.2 | 0.49 | 0.49 |
| Jan 27 | 34.3 | 13.2 | 0.51 | 0.51 |
| Jan 28 | 34.3 | 13.2 | 0.53 | 0.53 |
| Jan 29 | 34.2 | 13.2 | 0.54 | 0.54 |
| Jan 30 | 34.2 | 13.2 | 0.56 | 0.56 |
| Jan 31 | 34.2 | 13.2 | 0.58 | 0.58 |
Precipitation and snow add up through the month (/mo) and the year (/yr)
Weather history Lewistown - October 2026
| Day | HighºF | LowºF | Precip.inch |
|---|---|---|---|
| Oct 1 | 64.0 | 43.0 | 0.00 |
| Oct 2 | 75.9 | 42.1 | 0.00 |
| Oct 3 | 66.9 | 42.1 | 0.00 |
| Oct 4 | 77.0 | 37.9 | – |
| Oct 5 | 84.0 | 44.1 | – |
| Oct 6 | – | – | – |
| Oct 7 | – | – | 0.00 |
| Oct 8 | – | – | 0.00 |
| Oct 9 | 82.0 | 45.0 | 0.00 |
| Oct 10 | 53.1 | 30.9 | 0.69 |
| Oct 11 | 32.0 | 28.9 | – |
| Oct 12 | 30.9 | 19.9 | 0.02 |
| Oct 13 | 42.1 | 19.0 | 0.00 |
| Oct 14 | 48.9 | 23.0 | 0.00 |
| Oct 15 | 42.1 | 30.0 | 0.00 |
| Oct 16 | – | – | – |
| Oct 17 | – | – | – |
| Oct 18 | – | – | 0.00 |
| Oct 19 | – | – | – |
| Oct 20 | – | – | – |
| Oct 21 | – | – | 0.00 |
| Oct 22 | – | – | 0.00 |
| Oct 23 | 54.0 | 28.9 | 0.52 |
| Oct 24 | 41.0 | 18.0 | 0.00 |
| Oct 25 | 39.0 | 18.0 | 0.00 |
| Oct 26 | – | – | 0.00 |
| Oct 27 | – | – | – |
| Oct 28 | – | – | – |
| Oct 29 | – | – | – |
| Oct 30 | – | – | – |
| Oct 31 | – | – | – |
The data for October 2026 is incomplete: some days or values are missing.
- –No data
- –Not yet observed or received
- TTrace, too small to measure
Observed extremes
- Highest max temperature84.0ºF · Oct 5
- Lowest max temperature30.9ºF · Oct 12
- Highest min temperature45.0ºF · Oct 9
- Lowest min temperature18.0ºF · Oct 24
Geo Lewistown - Montana
Location
- Country
- United States
- State
- Montana
- County
- Fergus
- City
- Lewistown
- Zip Code
- 59457
- Elevation
- 4154 ft
- Longitude
- -109.47
- Latitude
- 47.05
- ICAO
- –
- IATA
- –