Average annual temperature is 12.6 °C
Absolute maximum temperature: 34.6 °C
Absolute minimum temperature: -17.0 °C
Number of sunny days: 170 days
Number of rainy days: 188 days
Number of snow days: 7 days
Look at detailed online map of Old Tappan
* Weather data for Old Tappan 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) | 18.8 | 19.8 | 15.4 | 31.1 | 28.9 | 34.1 | 33.4 | 31.3 | 34.6 | 28.8 | 19.7 | 16.7 |
| Average daytime temperature (°C) | 8.2 | 8.0 | 10.2 | 18.3 | 21.5 | 25.7 | 30.1 | 27.6 | 24.3 | 19.6 | 11.1 | 9.2 |
| Average temperature (°C) | 4.3 | 2.9 | 4.9 | 12.2 | 15.5 | 19.8 | 24.4 | 22.4 | 19.4 | 14.4 | 6.0 | 4.7 |
| Average night temperature (°C) | 1.0 | -1.2 | 0.7 | 7.4 | 9.9 | 15.2 | 19.9 | 18.1 | 15.6 | 10.3 | 1.9 | 1.3 |
| Absolute minimum temperature (°C) | -3.1 | -17.0 | -3.1 | -0.3 | 5.2 | 10.5 | 14.9 | 14.3 | 8.7 | 5.0 | -4.1 | -5.6 |
| 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 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.6 | 10.6 | 11.9 | 13.3 | 14.5 | 15.1 | 14.8 | 13.8 | 12.5 | 11.1 | 9.9 | 9.3 |
| 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 | 6.4 | 7.6 | 8.7 | 12.1 | 10.6 | 11.5 | 10.0 | 7.6 | 7.4 | 7.1 | 4.9 |
| Precipitation (mm) | 137 | 47 | 126 | 142 | 58 | 107 | 206 | 100 | 234 | 143 | 64 | 228 |
| Sunny days | 13 | 16 | 14 | 15 | 20 | 9 | 7 | 11 | 13 | 17 | 20 | 15 |
| Rainy days | 17 | 10 | 15 | 15 | 11 | 21 | 24 | 20 | 17 | 14 | 9 | 15 |
| Snow days | 1 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
The best time to visit Old Tappan during the most sunny months:
The largest precipitation sum in Old Tappan is at