Average annual temperature is 22.6 °C
Absolute maximum temperature: 35.7 °C
Absolute minimum temperature: 2.7 °C
Number of sunny days: 133 days
Number of rainy days: 232 days
Look at detailed online map of Isleboro
* Weather data for Isleboro 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) | 28.3 | 31.0 | 32.7 | 32.5 | 33.8 | 34.2 | 34.6 | 35.7 | 32.8 | 31.1 | 28.0 | 27.6 |
| Average daytime temperature (°C) | 22.6 | 26.0 | 26.1 | 26.7 | 27.8 | 30.5 | 32.1 | 32.3 | 29.3 | 26.6 | 23.3 | 20.9 |
| Average temperature (°C) | 17.0 | 20.1 | 20.8 | 22.5 | 23.5 | 25.6 | 27.2 | 28.0 | 25.7 | 23.2 | 19.8 | 17.5 |
| Average night temperature (°C) | 12.9 | 15.3 | 16.5 | 19.1 | 19.6 | 22.1 | 23.9 | 24.7 | 22.8 | 20.4 | 16.9 | 14.6 |
| Absolute minimum temperature (°C) | 2.7 | 7.4 | 7.5 | 14.0 | 14.9 | 18.8 | 21.5 | 22.8 | 17.5 | 11.6 | 7.7 | 4.8 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 14.0 | 13.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 |
| Daylight mean duration (h) | 10.5 | 11.2 | 12.0 | 12.9 | 13.6 | 14.0 | 13.8 | 13.2 | 12.3 | 11.5 | 10.7 | 10.3 |
| Daylight minimum duration (h) | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 13.0 | 13.0 | 12.0 | 11.0 | 11.0 | 10.0 | 10.0 |
| Sunshine mean duration (h) | 8.6 | 9.7 | 10.2 | 9.9 | 11.6 | 11.2 | 11.3 | 11.6 | 10.0 | 9.3 | 7.1 | 7.1 |
| Precipitation (mm) | 43 | 31 | 28 | 167 | 127 | 221 | 181 | 138 | 236 | 51 | 183 | 105 |
| Sunny days | 19 | 16 | 14 | 8 | 12 | 3 | 2 | 4 | 8 | 18 | 13 | 16 |
| Rainy days | 12 | 12 | 17 | 22 | 19 | 27 | 29 | 27 | 22 | 13 | 17 | 15 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Isleboro is at