Average annual temperature is 11.8 °C
Absolute maximum temperature: 32.1 °C
Absolute minimum temperature: -11.5 °C
Number of sunny days: 172 days
Number of rainy days: 180 days
Number of snow days: 13 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) | 16.5 | 19.3 | 19.3 | 25.5 | 29.0 | 32.1 | 31.4 | 31.6 | 32.0 | 29.0 | 20.7 | 15.9 |
| Average daytime temperature (°C) | 5.2 | 9.8 | 9.7 | 16.8 | 21.3 | 25.4 | 27.7 | 26.6 | 24.6 | 17.8 | 11.0 | 8.1 |
| Average temperature (°C) | 1.7 | 3.2 | 4.0 | 10.7 | 15.6 | 19.7 | 22.8 | 21.4 | 19.2 | 13.1 | 5.5 | 4.1 |
| Average night temperature (°C) | -1.3 | -1.3 | -0.3 | 5.3 | 10.3 | 14.4 | 18.2 | 16.6 | 14.4 | 9.0 | 1.6 | 1.2 |
| Absolute minimum temperature (°C) | -11.4 | -11.5 | -8.5 | -0.8 | 1.8 | 9.0 | 14.4 | 10.5 | 9.3 | -3.3 | -8.4 | -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) | 9.7 | 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) | 3.3 | 7.2 | 7.1 | 8.7 | 10.4 | 10.3 | 12.2 | 11.0 | 9.6 | 7.0 | 7.4 | 4.4 |
| Precipitation (mm) | 120 | 61 | 144 | 66 | 72 | 124 | 109 | 114 | 30 | 54 | 32 | 43 |
| Sunny days | 9 | 16 | 11 | 13 | 21 | 14 | 8 | 14 | 18 | 14 | 24 | 10 |
| Rainy days | 18 | 11 | 15 | 17 | 10 | 16 | 23 | 17 | 12 | 16 | 6 | 19 |
| Snow days | 4 | 1 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 2 |
The best time to visit Gretna during the most sunny months:
The largest precipitation sum in Gretna is at