Average annual temperature is 8.6 °C
Absolute maximum temperature: 32.4 °C
Absolute minimum temperature: -32.0 °C
Number of sunny days: 107 days
Number of rainy days: 219 days
Number of snow days: 39 days
Look at detailed online map of St. Lawrence County
* Weather data for St. Lawrence County 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) | 8.5 | 14.7 | 9.3 | 27.1 | 30.4 | 32.4 | 31.6 | 26.2 | 30.6 | 29.6 | 15.1 | 12.3 |
| Average daytime temperature (°C) | 0.9 | 2.1 | 4.0 | 14.7 | 18.6 | 23.3 | 26.1 | 22.7 | 22.1 | 15.5 | 6.0 | 4.5 |
| Average temperature (°C) | -2.7 | -4.0 | -0.7 | 8.5 | 12.3 | 17.8 | 21.2 | 18.4 | 17.1 | 11.7 | 2.0 | 1.0 |
| Average night temperature (°C) | -6.1 | -9.1 | -4.9 | 3.3 | 6.5 | 13.1 | 17.2 | 14.8 | 13.1 | 8.5 | -1.4 | -1.8 |
| Absolute minimum temperature (°C) | -16.5 | -32.0 | -14.8 | -8.5 | -0.4 | 6.4 | 11.6 | 9.3 | 8.4 | -2.5 | -7.4 | -10.5 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.3 | 10.4 | 11.9 | 13.5 | 14.8 | 15.5 | 15.2 | 14.0 | 12.5 | 11.0 | 9.6 | 8.9 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 8.0 |
| Sunshine mean duration (h) | 2.4 | 4.9 | 5.3 | 8.1 | 11.1 | 9.9 | 10.9 | 9.9 | 9.5 | 5.1 | 4.9 | 2.5 |
| Precipitation (mm) | 132 | 94 | 79 | 87 | 99 | 156 | 151 | 148 | 67 | 126 | 73 | 155 |
| Sunny days | 4 | 4 | 8 | 10 | 20 | 9 | 5 | 3 | 18 | 9 | 10 | 7 |
| Rainy days | 17 | 15 | 15 | 19 | 11 | 21 | 26 | 28 | 12 | 22 | 14 | 19 |
| Snow days | 10 | 9 | 8 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 5 |
The best time to visit St. Lawrence County during the most sunny months:
Months with the longest average daylight duration in St. Lawrence County:
The largest precipitation sum in St. Lawrence County is at