Average annual temperature is 10.4 °C
Absolute maximum temperature: 34.6 °C
Absolute minimum temperature: -19.1 °C
Number of sunny days: 267 days
Number of rainy days: 78 days
Number of snow days: 20 days
Look at detailed online map of Īstī Sū
* Weather data for Īstī Sū Iran is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 5.8 | 12.9 | 17.4 | 23.1 | 26.2 | 32.3 | 34.6 | 34.1 | 32.0 | 22.8 | 16.9 | 12.0 |
| Average daytime temperature (°C) | -0.9 | 1.8 | 12.0 | 16.6 | 20.6 | 25.7 | 27.5 | 29.1 | 23.9 | 18.3 | 12.9 | 7.4 |
| Average temperature (°C) | -5.0 | -3.5 | 6.5 | 10.4 | 14.5 | 18.7 | 20.9 | 21.5 | 16.6 | 12.4 | 7.7 | 3.1 |
| Average night temperature (°C) | -9.3 | -9.4 | 1.0 | 4.2 | 8.2 | 11.6 | 14.4 | 13.6 | 10.0 | 6.4 | 2.4 | -1.1 |
| Absolute minimum temperature (°C) | -18.7 | -19.1 | -6.5 | -5.0 | -0.4 | 7.2 | 11.8 | 9.5 | 5.0 | 2.7 | -3.9 | -8.3 |
| 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 | 14.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.9 | 10.8 | 12.0 | 13.2 | 14.2 | 14.7 | 14.5 | 13.6 | 12.4 | 11.2 | 10.2 | 9.6 |
| 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) | 7.3 | 8.3 | 8.7 | 11.2 | 11.3 | 13.0 | 12.8 | 12.0 | 10.9 | 9.6 | 8.2 | 7.4 |
| Precipitation (mm) | 29 | 22 | 95 | 28 | 45 | 9 | 1 | 1 | 3 | 11 | 22 | 40 |
| Sunny days | 22 | 17 | 14 | 18 | 18 | 24 | 30 | 28 | 28 | 25 | 21 | 22 |
| Rainy days | 1 | 1 | 17 | 11 | 13 | 6 | 1 | 3 | 2 | 6 | 9 | 8 |
| Snow days | 8 | 10 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The best time to visit Īstī Sū during the most sunny months:
The largest precipitation sum in Īstī Sū is at