Average annual temperature is 11.9 °C
Absolute maximum temperature: 37.1 °C
Absolute minimum temperature: -18.3 °C
Number of sunny days: 221 days
Number of rainy days: 124 days
Number of snow days: 20 days
Look at detailed online map of Gretna
* Weather data for Gretna 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) | 8.9 | 13.1 | 22.1 | 29.4 | 30.6 | 32.7 | 35.4 | 37.1 | 34.5 | 32.3 | 19.5 | 15.6 |
| Average daytime temperature (°C) | 1.6 | 6.0 | 8.8 | 18.6 | 25.3 | 29.3 | 28.7 | 29.3 | 27.7 | 18.8 | 12.0 | 6.5 |
| Average temperature (°C) | -2.6 | -1.0 | 2.2 | 11.3 | 18.7 | 23.5 | 23.5 | 24.1 | 21.6 | 13.4 | 6.0 | 1.8 |
| Average night temperature (°C) | -5.7 | -5.6 | -2.3 | 5.5 | 12.9 | 17.8 | 18.9 | 19.6 | 16.5 | 8.9 | 1.2 | -1.9 |
| Absolute minimum temperature (°C) | -17.9 | -18.3 | -11.2 | -4.4 | 3.5 | 10.0 | 12.5 | 12.7 | 10.0 | -5.5 | -7.4 | -5.4 |
| 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) | 5.0 | 7.6 | 8.2 | 9.8 | 11.7 | 13.1 | 11.4 | 11.2 | 10.4 | 7.9 | 7.0 | 5.3 |
| Precipitation (mm) | 48 | 42 | 35 | 28 | 41 | 108 | 102 | 62 | 31 | 44 | 11 | 57 |
| Sunny days | 18 | 18 | 20 | 21 | 18 | 15 | 12 | 18 | 20 | 16 | 23 | 22 |
| Rainy days | 5 | 5 | 10 | 8 | 13 | 15 | 19 | 13 | 10 | 14 | 6 | 6 |
| Snow days | 8 | 5 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 3 |
The best time to visit Gretna during the most sunny months:
The largest precipitation sum in Gretna is at