Average annual temperature is 14.2 °C
Absolute maximum temperature: 36.1 °C
Absolute minimum temperature: -9.2 °C
Number of sunny days: 184 days
Number of rainy days: 179 days
Number of snow days: 2 days
Look at detailed online map of New Castle County
* Weather data for New Castle County United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 17.4 | 20.9 | 19.8 | 28.7 | 29.4 | 34.5 | 35.0 | 33.1 | 36.1 | 28.2 | 20.2 | 16.2 |
| Average daytime temperature (°C) | 9.7 | 10.5 | 12.1 | 20.2 | 22.6 | 27.1 | 31.1 | 29.7 | 26.1 | 21.0 | 12.8 | 10.0 |
| Average temperature (°C) | 5.7 | 5.6 | 6.6 | 14.4 | 16.6 | 21.1 | 25.6 | 24.3 | 21.0 | 15.3 | 7.6 | 5.8 |
| Average night temperature (°C) | 2.5 | 1.5 | 2.0 | 9.6 | 11.1 | 16.2 | 20.9 | 19.8 | 16.8 | 11.0 | 3.3 | 2.4 |
| Absolute minimum temperature (°C) | -3.2 | -9.2 | -4.0 | 2.3 | 4.9 | 12.3 | 17.4 | 15.3 | 11.9 | 4.9 | -4.7 | -2.9 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.7 | 10.7 | 12.0 | 13.3 | 14.4 | 14.9 | 14.7 | 13.7 | 12.5 | 11.2 | 10.0 | 9.4 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 4.9 | 6.9 | 7.6 | 9.5 | 11.5 | 11.0 | 11.8 | 10.5 | 8.4 | 8.8 | 7.8 | 4.9 |
| Precipitation (mm) | 131 | 52 | 90 | 129 | 34 | 105 | 106 | 107 | 123 | 33 | 66 | 181 |
| Sunny days | 14 | 16 | 14 | 16 | 18 | 11 | 8 | 11 | 15 | 20 | 22 | 19 |
| Rainy days | 17 | 11 | 16 | 14 | 13 | 19 | 23 | 20 | 15 | 11 | 8 | 12 |
| Snow days | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit New Castle County during the most sunny months:
The largest precipitation sum in New Castle County is at