Average annual temperature is 11.9 °C
Absolute maximum temperature: 33.7 °C
Absolute minimum temperature: -22.8 °C
Number of sunny days: 161 days
Number of rainy days: 197 days
Number of snow days: 7 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) | 12.5 | 18.3 | 15.3 | 32.3 | 28.3 | 30.7 | 32.3 | 29.9 | 33.7 | 27.7 | 18.7 | 16.3 |
| Average daytime temperature (°C) | 7.0 | 6.8 | 9.1 | 17.0 | 21.0 | 24.1 | 28.5 | 26.1 | 23.3 | 19.1 | 10.2 | 8.5 |
| Average temperature (°C) | 3.3 | 1.9 | 4.1 | 11.3 | 14.9 | 18.5 | 23.8 | 21.5 | 19.0 | 14.2 | 5.3 | 4.4 |
| Average night temperature (°C) | 0.0 | -2.6 | -0.1 | 6.3 | 9.4 | 14.1 | 20.0 | 17.6 | 15.7 | 10.6 | 1.4 | 1.1 |
| Absolute minimum temperature (°C) | -5.5 | -22.8 | -4.2 | -2.5 | 3.0 | 7.8 | 15.1 | 13.6 | 8.6 | 4.7 | -4.0 | -6.1 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 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) | 9.5 | 10.6 | 11.9 | 13.3 | 14.5 | 15.2 | 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 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 3.9 | 6.4 | 7.4 | 8.4 | 11.6 | 9.5 | 10.9 | 9.4 | 7.3 | 7.7 | 7.0 | 5.3 |
| Precipitation (mm) | 182 | 53 | 115 | 81 | 86 | 88 | 184 | 142 | 248 | 120 | 56 | 189 |
| Sunny days | 9 | 14 | 17 | 15 | 21 | 3 | 8 | 12 | 13 | 14 | 20 | 15 |
| Rainy days | 19 | 11 | 14 | 15 | 10 | 27 | 23 | 19 | 17 | 17 | 10 | 15 |
| Snow days | 3 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The best time to visit Johnston during the most sunny months:
The largest precipitation sum in Johnston is at