New Castle, PA Weather & Climate Normals
New Castle's real weather, in one number
New Castle, PA scores 46/100 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. 5 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
New Castle's hottest and coldest months
New Castle's hottest month is Jul, averaging 73°F; its coldest is Jan, averaging 28°F, a 45.2°F swing across the year, one of the widest gaps in this dataset.
New Castle's weather across the year
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 37°F | 19°F | 2.86in | 10.1in |
| Feb | 40°F | 20°F | 2.2in | 7.7in |
| Mar | 49°F | 27°F | 3.08in | 3.7in |
| Apr | 63°F | 36°F | 3.65in | 0.3in |
| May | 73°F | 47°F | 3.89in | 0in |
| Jun | 82°F | 56°F | 4.47in | 0in |
| Jul | 86°F | 60°F | 4.55in | 0in |
| Aug | 85°F | 59°F | 3.91in | 0in |
| Sep | 79°F | 52°F | 3.86in | 0in |
| Oct | 66°F | 41°F | 3.22in | 0in |
| Nov | 53°F | 32°F | 2.96in | 0.8in |
| Dec | 42°F | 25°F | 3.13in | 4.9in |
May, Jun, Jul, Aug, and Sep are the best time to see New Castle at its mildest; the rest of the year, plan around Jan's cold.
Rain and snow in New Castle
New Castle averages 41.78in of precipitation a year across roughly 156 days with measurable rain or snow, and 27.5in of snow a year.
Where New Castle ranks
New Castle ranks 3000 of 4876 US cities in this dataset for comfort score, and 99 of 193 within PA. About 21,332 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from New Castle 1 N, PA US, 1.7 miles from New Castle, not a prediction for any specific day.
More on how this is worked out
What a 30-year climate normal actually is · Why this uses the nearest NOAA station