Average annual temperature is 12.2 °C
Absolute maximum temperature: 33.3 °C
Absolute minimum temperature: -11.7 °C
Number of sunny days: 152 days
Number of rainy days: 204 days
Number of snow days: 9 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) | 16.7 | 20.8 | 21.1 | 27.6 | 30.0 | 31.9 | 32.8 | 32.0 | 33.3 | 27.8 | 18.5 | 16.1 |
| Average daytime temperature (°C) | 7.6 | 10.8 | 10.4 | 18.3 | 21.7 | 25.6 | 28.7 | 27.2 | 24.5 | 18.1 | 11.2 | 8.8 |
| Average temperature (°C) | 3.3 | 4.2 | 4.6 | 11.5 | 15.2 | 19.4 | 22.9 | 21.5 | 18.8 | 13.3 | 5.9 | 4.7 |
| Average night temperature (°C) | 0.4 | -0.5 | 0.1 | 5.9 | 9.2 | 14.0 | 18.4 | 16.9 | 14.1 | 9.3 | 1.9 | 1.6 |
| Absolute minimum temperature (°C) | -6.7 | -11.7 | -8.1 | -2.3 | 1.9 | 8.7 | 14.6 | 11.9 | 8.7 | 1.4 | -7.1 | -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 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.7 | 10.7 | 11.9 | 13.3 | 14.4 | 15.0 | 14.7 | 13.7 | 12.5 | 11.1 | 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) | 2.9 | 6.9 | 6.3 | 8.6 | 10.4 | 10.7 | 11.3 | 10.7 | 9.0 | 6.7 | 6.7 | 4.4 |
| Precipitation (mm) | 122 | 64 | 100 | 57 | 89 | 119 | 113 | 102 | 38 | 111 | 46 | 61 |
| Sunny days | 8 | 14 | 11 | 16 | 19 | 14 | 4 | 8 | 12 | 13 | 20 | 13 |
| Rainy days | 19 | 13 | 18 | 14 | 12 | 16 | 27 | 23 | 18 | 18 | 9 | 17 |
| Snow days | 4 | 1 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
The best time to visit Gretna during the most sunny months:
The largest precipitation sum in Gretna is at