New Castle, DE Weather & Climate Normals
New Castle's real weather, in one number
New Castle, DE scores 43/100 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.
New Castle's hottest and coldest months
New Castle's hottest month is Jul, averaging 78°F; its coldest is Jan, averaging 34°F, a 44.1°F swing across the year, a middling gap by national standards.
New Castle's weather across the year
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 41°F | 26°F | 3.23in | 6.1in |
| Feb | 44°F | 27°F | 2.83in | 7.8in |
| Mar | 53°F | 34°F | 4.16in | 3.1in |
| Apr | 64°F | 44°F | 3.51in | 0.1in |
| May | 74°F | 53°F | 3.57in | 0in |
| Jun | 82°F | 63°F | 4.67in | 0in |
| Jul | 87°F | 68°F | 4.41in | 0in |
| Aug | 85°F | 67°F | 3.98in | 0in |
| Sep | 79°F | 59°F | 4.38in | 0in |
| Oct | 67°F | 47°F | 3.68in | 0in |
| Nov | 56°F | 37°F | 3.06in | 0.2in |
| Dec | 46°F | 30°F | 3.85in | 2.9in |
May, Jun, Sep, and Oct are the best time to see New Castle at its mildest; the rest of the year, plan around Jul's heat and Jan's cold.
Rain and snow in New Castle
New Castle averages 45.33in of precipitation a year across roughly 122 days with measurable rain or snow, and 20.2in of snow a year.
Where New Castle ranks
New Castle ranks 4127 of 4876 US cities in this dataset for comfort score, and 11 of 11 within DE. About 5,715 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Wilmington New Castle Co Ap, DE US, 1.8 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