Average annual temperature is 10.5 °C
Absolute maximum temperature: 31.9 °C
Absolute minimum temperature: -14.6 °C
Number of sunny days: 140 days
Number of rainy days: 196 days
Number of snow days: 29 days
Look at detailed online map of Costello
* Weather data for Costello 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) | 13.9 | 17.6 | 15.3 | 28.4 | 31.1 | 31.9 | 31.9 | 31.2 | 30.8 | 27.1 | 16.2 | 12.2 |
| Average daytime temperature (°C) | 4.9 | 8.2 | 7.1 | 17.3 | 20.8 | 24.1 | 27.8 | 25.2 | 22.2 | 16.3 | 8.9 | 6.7 |
| Average temperature (°C) | 1.7 | 1.5 | 1.8 | 10.2 | 13.8 | 18.3 | 22.0 | 19.9 | 17.1 | 11.8 | 4.1 | 3.3 |
| Average night temperature (°C) | -0.8 | -3.2 | -2.3 | 4.5 | 7.2 | 13.0 | 17.0 | 15.7 | 13.0 | 8.1 | 0.5 | 0.7 |
| Absolute minimum temperature (°C) | -6.6 | -14.6 | -11.3 | -4.4 | 0.8 | 7.5 | 13.8 | 11.4 | 7.9 | 0.3 | -7.5 | -4.9 |
| 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 | 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 | 9.2 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 14.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 2.8 | 6.3 | 5.9 | 8.4 | 11.0 | 10.5 | 11.7 | 9.9 | 8.5 | 6.0 | 6.6 | 3.2 |
| Precipitation (mm) | 104 | 72 | 97 | 70 | 34 | 124 | 107 | 144 | 46 | 77 | 47 | 97 |
| Sunny days | 7 | 11 | 5 | 11 | 21 | 10 | 9 | 9 | 15 | 13 | 16 | 13 |
| Rainy days | 16 | 13 | 17 | 17 | 10 | 20 | 22 | 22 | 15 | 18 | 11 | 15 |
| Snow days | 8 | 4 | 9 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 3 |
The best time to visit Costello during the most sunny months:
The largest precipitation sum in Costello is at