Average annual temperature is 11.8 °C
Absolute maximum temperature: 33.5 °C
Absolute minimum temperature: -10.9 °C
Number of sunny days: 156 days
Number of rainy days: 199 days
Number of snow days: 10 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) | 15.1 | 20.9 | 19.8 | 27.1 | 30.2 | 32.8 | 33.5 | 32.1 | 32.9 | 27.9 | 18.5 | 15.6 |
| Average daytime temperature (°C) | 6.7 | 10.5 | 9.9 | 17.9 | 22.0 | 25.9 | 29.3 | 27.2 | 24.5 | 17.9 | 10.8 | 8.4 |
| Average temperature (°C) | 2.5 | 3.5 | 4.1 | 10.9 | 15.1 | 19.5 | 23.1 | 21.3 | 18.7 | 12.9 | 5.5 | 4.3 |
| Average night temperature (°C) | -0.5 | -1.3 | -0.3 | 5.2 | 9.2 | 13.9 | 18.0 | 16.5 | 14.0 | 9.0 | 1.6 | 1.5 |
| Absolute minimum temperature (°C) | -6.8 | -10.9 | -7.5 | -2.1 | 1.9 | 8.8 | 13.8 | 11.6 | 8.7 | -0.1 | -7.4 | -5.1 |
| 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 | 9.3 |
| 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 | 6.6 | 6.6 | 8.8 | 10.6 | 10.8 | 11.8 | 11.0 | 8.9 | 6.9 | 6.7 | 4.1 |
| Precipitation (mm) | 151 | 55 | 124 | 92 | 77 | 114 | 112 | 92 | 41 | 69 | 48 | 67 |
| Sunny days | 9 | 12 | 12 | 14 | 20 | 13 | 4 | 11 | 14 | 16 | 19 | 12 |
| Rainy days | 20 | 15 | 15 | 16 | 11 | 17 | 27 | 20 | 16 | 15 | 9 | 18 |
| Snow days | 2 | 1 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 1 |
The best time to visit Johnston during the most sunny months:
The largest precipitation sum in Johnston is at