Weather Reports for the city of Lewistown in Montana
snow
rain
temp
wind
humidity| Jan | Feb | Mar | Apr | May | Jun | |
|---|---|---|---|---|---|---|
| Average High (°F) | 37.7 | 33.3 | 46.5 | 55.1 | 64.0 | 74.3 |
| Average Low (°F) | 15.6 | 11.8 | 22.4 | 28.8 | 37.7 | 45.8 |
| All Time High (°F) | 63.9 | 70.0 | 75.2 | 82.9 | 84.9 | 98.1 |
| All Time Low (°F) | -25.1 | -33.0 | -34.1 | -8.0 | 12.9 | 31.8 |
| Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| Average High (°F) | 84.5 | 83.3 | 72.8 | 57.9 | 46.2 | 36.4 |
| Average Low (°F) | 52.2 | 50.7 | 42.8 | 31.9 | 22.6 | 15.1 |
| All Time High (°F) | 100.6 | 101.5 | 99.0 | 90.0 | 75.0 | 65.8 |
| All Time Low (°F) | 36.5 | 33.1 | 18.0 | -6.7 | -17.0 | -29.0 |
| Jan | Feb | Mar | Apr | May | Jun | |
|---|---|---|---|---|---|---|
| Percent of Rainy Days | 0.1 | 0.1 | 0.1 | 0.3 | 0.4 | 0.4 |
| Avg. Rainfall (in) on Rainy Day | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 |
| All Time Rainfall (in) on Rainy Day | 0.2 | 0.5 | 0.4 | 1.0 | 1.8 | 2.0 |
| 30 Day Rain Accumulation | 0.4 | 0.4 | 0.4 | 1.4 | 2.8 | 2.3 |
| All Time 30 Day Rain Accumulation | 1.2 | 1.5 | 1.6 | 3.4 | 6.7 | 6.7 |
| Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| Percent of Rainy Days | 0.2 | 0.2 | 0.2 | 0.2 | 0.1 | 0.0 |
| Avg. Rainfall (in) on Rainy Day | 0.2 | 0.2 | 0.2 | 0.1 | 0.1 | 0.0 |
| All Time Rainfall (in) on Rainy Day | 1.3 | 3.2 | 1.0 | 1.6 | 0.6 | 0.1 |
| 30 Day Rain Accumulation | 1.3 | 1.3 | 1.2 | 1.1 | 0.5 | 0.3 |
| All Time 30 Day Rain Accumulation | 4.0 | 6.1 | 3.1 | 4.0 | 1.8 | 0.7 |
| Jan | Feb | Mar | Apr | May | Jun | |
|---|---|---|---|---|---|---|
| Percent of Days with Snowfall | 0.2 | 0.2 | 0.1 | 0.2 | 0.1 | 0.0 |
| Avg. Snowfall Depth (in) | 1.4 | 1.2 | 0.7 | 1.0 | 0.9 | 0.0 |
| 30 Day Snowfall Total (in) | 6.9 | 7.1 | 3.1 | 6.2 | 1.5 | 0.0 |
| All Time Snowfall Depth (in) | 18.0 | 15.0 | 7.6 | 12.8 | 9.0 | 0.0 |
| All Time 30 Day Snowfall Total (in) | 30.2 | 48.6 | 18.4 | 17.9 | 9.8 | 0.0 |
| Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| Percent of Days with Snowfall | 0.0 | 0.0 | 0.0 | 0.1 | 0.2 | 0.2 |
| Avg. Snowfall Depth (in) | 0.0 | 0.0 | 0.7 | 0.9 | 1.3 | 1.1 |
| 30 Day Snowfall Total (in) | 0.0 | 0.0 | 0.6 | 3.3 | 5.7 | 5.4 |
| All Time Snowfall Depth (in) | 0.0 | 0.0 | 4.7 | 6.2 | 10.2 | 12.0 |
| All Time 30 Day Snowfall Total (in) | 0.0 | 0.0 | 4.8 | 16.8 | 23.5 | 16.7 |
Instead of using humidity directly we use dew point to measure what people commonly mean when saying it feels humid. Dew point is classified into 4 categories: Dry (under 25°F), Comfortable (25°F to 60°F), Muggy (60°F to 70°F) and Oppressive (70°F or greater). The table below shows the percentage of days with a dew point within a particular class.
| Jan | Feb | Mar | Apr | May | Jun | |
|---|---|---|---|---|---|---|
| Dry | 81.9 | 84.5 | 64.9 | 38.4 | 5.6 | 0.1 |
| Comfortable | 18.1 | 15.5 | 35.1 | 61.6 | 94.4 | 99.7 |
| Muggy | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 |
| Oppressive | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| Dry | 0.0 | 0.1 | 3.1 | 24.8 | 65.4 | 84.9 |
| Comfortable | 99.5 | 99.7 | 96.9 | 75.2 | 34.6 | 15.1 |
| Muggy | 0.5 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 |
| Oppressive | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
The table below shows the distribution of average wind speeds in miles per hour for a given month or day. Wind speed may vary throughout a day and we show the average speed. Peak gusts or sustained maximum speeds may be significantly higher.
| Jan | Feb | Mar | Apr | May | Jun | |
|---|---|---|---|---|---|---|
| 10th | 4.0 | 4.3 | 4.6 | 4.7 | 4.7 | 4.7 |
| 25th | 5.8 | 5.8 | 5.8 | 6.2 | 5.8 | 5.8 |
| 50th | 8.2 | 8.6 | 8.2 | 8.8 | 8.1 | 8.1 |
| 75th | 12.7 | 12.9 | 12.0 | 12.5 | 11.4 | 11.3 |
| 90th | 17.2 | 17.8 | 16.1 | 16.4 | 14.8 | 14.7 |
| Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| 10th | 4.7 | 4.7 | 4.6 | 4.2 | 4.3 | 4.0 |
| 25th | 5.8 | 5.8 | 5.8 | 5.8 | 5.8 | 5.7 |
| 50th | 8.1 | 7.7 | 7.8 | 8.1 | 8.2 | 8.1 |
| 75th | 10.7 | 10.4 | 10.6 | 11.9 | 12.5 | 12.7 |
| 90th | 13.9 | 13.4 | 14.2 | 16.1 | 16.6 | 17.3 |
The table below shows the distribution of wind direction (wind coming out of a particular direction) for a given month or day. Wind direction may vary throughout a day and the computation accounts for all measured changes in direction througout the day or month.
| Jan | Feb | Mar | Apr | May | Jun | |
|---|---|---|---|---|---|---|
| North | 10.2 | 14.7 | 14.0 | 17.1 | 15.0 | 13.0 |
| NorthEast | 1.7 | 2.4 | 2.4 | 3.3 | 4.0 | 3.5 |
| East | 8.2 | 10.9 | 11.5 | 12.4 | 18.5 | 13.7 |
| SouthEast | 6.2 | 5.3 | 6.7 | 6.7 | 11.1 | 10.6 |
| South | 7.3 | 6.9 | 8.6 | 7.6 | 9.1 | 9.4 |
| SouthWest | 19.3 | 14.7 | 14.4 | 10.0 | 8.2 | 11.6 |
| West | 33.0 | 29.9 | 26.5 | 23.1 | 17.2 | 22.9 |
| NorthWest | 14.0 | 15.1 | 15.8 | 19.7 | 16.8 | 15.4 |
| Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|
| North | 14.8 | 14.7 | 14.6 | 14.2 | 13.2 | 9.7 |
| NorthEast | 5.1 | 4.7 | 4.3 | 2.0 | 2.0 | 1.7 |
| East | 15.0 | 14.7 | 15.0 | 10.0 | 7.6 | 9.0 |
| SouthEast | 14.0 | 14.6 | 13.0 | 9.1 | 6.8 | 6.8 |
| South | 12.3 | 11.6 | 10.2 | 10.8 | 8.1 | 8.3 |
| SouthWest | 10.1 | 9.5 | 11.3 | 13.5 | 19.0 | 20.3 |
| West | 16.4 | 15.9 | 17.5 | 23.5 | 30.3 | 33.5 |
| NorthWest | 12.1 | 14.2 | 14.0 | 16.9 | 13.0 | 10.7 |