Average annual temperature is 11.8 °C
Absolute maximum temperature: 37.8 °C
Absolute minimum temperature: -26.2 °C
Number of sunny days: 214 days
Number of rainy days: 135 days
Number of snow days: 16 days
Look at detailed online map of Johnston
* Weather data for Johnston 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) | 12.2 | 13.3 | 23.0 | 26.6 | 31.4 | 32.7 | 35.5 | 37.8 | 35.4 | 32.4 | 18.7 | 14.8 |
| Average daytime temperature (°C) | 1.0 | 4.8 | 8.1 | 17.7 | 25.0 | 29.1 | 29.3 | 29.2 | 27.2 | 18.5 | 11.3 | 7.1 |
| Average temperature (°C) | -3.2 | -1.6 | 2.2 | 10.6 | 18.4 | 23.1 | 23.8 | 24.1 | 21.1 | 13.5 | 5.7 | 2.7 |
| Average night temperature (°C) | -6.5 | -6.2 | -2.0 | 5.1 | 12.0 | 17.5 | 18.8 | 19.7 | 16.2 | 9.5 | 1.4 | -0.4 |
| Absolute minimum temperature (°C) | -26.2 | -24.5 | -12.3 | -4.2 | 2.1 | 9.6 | 13.4 | 13.4 | 11.5 | -3.4 | -11.0 | -5.8 |
| 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 | 14.9 | 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) | 4.8 | 7.1 | 7.2 | 9.3 | 11.2 | 12.5 | 12.2 | 11.4 | 10.7 | 7.5 | 7.2 | 4.8 |
| Precipitation (mm) | 70 | 40 | 61 | 45 | 37 | 34 | 107 | 90 | 35 | 95 | 8 | 45 |
| Sunny days | 18 | 17 | 15 | 19 | 19 | 17 | 16 | 15 | 17 | 16 | 25 | 20 |
| Rainy days | 6 | 9 | 15 | 11 | 12 | 13 | 15 | 16 | 13 | 14 | 3 | 8 |
| Snow days | 7 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 3 |
The best time to visit Johnston during the most sunny months:
The largest precipitation sum in Johnston is at