Lewistown, MT Weather & Climate Normals
What a normal year in Lewistown actually looks like
On the 30-year record NOAA keeps for Lewistown, MT, the comfort score comes out to 45/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 4 months a year land in the 55–75°F range this site treats as mild.
How much Lewistown's weather actually swings
Average temperatures in Lewistown run from 24°F in Jan up to 66°F in Jul, a 42.5°F seasonal swing, a middling gap by national standards.
Lewistown, month by month
| Month | Avg high | Avg low | Precip |
|---|---|---|---|
| Jan | 34°F | 13°F | 0.58in |
| Feb | 35°F | 14°F | 0.49in |
| Mar | 44°F | 21°F | 0.87in |
| Apr | 53°F | 29°F | 1.71in |
| May | 63°F | 37°F | 2.88in |
| Jun | 71°F | 45°F | 3.35in |
| Jul | 82°F | 51°F | 1.76in |
| Aug | 81°F | 50°F | 1.69in |
| Sep | 70°F | 42°F | 1.39in |
| Oct | 56°F | 31°F | 1.27in |
| Nov | 43°F | 21°F | 0.67in |
| Dec | 35°F | 14°F | 0.51in |
If you're timing a visit, Jun, Jul, Aug, and Sep are Lewistown's mildest stretch; if you're moving there, you should plan around Jan's cold instead.
How wet Lewistown actually gets
Lewistown averages 17.17in of precipitation a year across roughly 116 days with measurable rain or snow; the nearest NOAA station does not record snowfall, so no snow figure is shown rather than guessed.
Lewistown against the rest of the country
Out of 4876 cities scored here, Lewistown comes in at 3583; within MT alone it ranks 6 of 19. Population is about 6,204.
Checking the actual forecast
These figures come from Lewistown Muni Ap, MT US, the NOAA station 0.3 miles from Lewistown, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why some cities show no snow or rain figure · Why this uses the nearest NOAA station