Norristown, PA Weather & Climate Normals
Norristown's real weather, in one number
Norristown, PA scores 42/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 4 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Norristown's hottest and coldest months
Norristown's hottest month is Jul, averaging 78°F; its coldest is Jan, averaging 32°F, a 45.5°F swing across the year, one of the widest gaps in this dataset.
Norristown's weather across the year
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 42°F | 23°F | 3.66in | 6.8in |
| Feb | 44°F | 25°F | 2.98in | 10.9in |
| Mar | 52°F | 32°F | 4.41in | 3in |
| Apr | 65°F | 42°F | 3.9in | 0.2in |
| May | 75°F | 52°F | 4.25in | 0in |
| Jun | 84°F | 62°F | 4.2in | 0in |
| Jul | 89°F | 67°F | 4.7in | 0in |
| Aug | 87°F | 65°F | 4.98in | 0in |
| Sep | 80°F | 58°F | 4.91in | 0in |
| Oct | 68°F | 45°F | 4.32in | 0.1in |
| Nov | 57°F | 35°F | 3.61in | 0.1in |
| Dec | 46°F | 28°F | 4.73in | 4.2in |
May, Jun, Sep, and Oct are the best time to see Norristown at its mildest; the rest of the year, plan around Jul's heat and Jan's cold.
Rain and snow in Norristown
Norristown averages 50.65in of precipitation a year across roughly 131 days with measurable rain or snow, and 25.3in of snow a year.
Where Norristown ranks
Norristown ranks 4182 of 4876 US cities in this dataset for comfort score, and 163 of 193 within PA. About 36,075 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Norristown, PA US, 0.9 miles from Norristown, not a prediction for any specific day.
More on how this is worked out
How the comfort score is calculated · Why some cities show no snow or rain figure