Average annual temperature is 9.5 °C
Absolute maximum temperature: 34.7 °C
Absolute minimum temperature: -28.7 °C
Number of sunny days: 157 days
Number of rainy days: 185 days
Number of snow days: 23 days
Look at detailed online map of Merrimack County
* Weather data for Merrimack 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) | 8.9 | 13.0 | 11.7 | 29.0 | 32.0 | 34.7 | 31.3 | 27.6 | 31.7 | 28.0 | 17.3 | 14.6 |
| Average daytime temperature (°C) | 3.4 | 3.3 | 6.0 | 14.4 | 20.8 | 23.2 | 27.1 | 24.6 | 22.4 | 17.5 | 7.5 | 6.1 |
| Average temperature (°C) | -0.6 | -3.1 | 1.0 | 8.3 | 14.0 | 17.6 | 22.1 | 19.6 | 17.7 | 12.4 | 2.5 | 1.7 |
| Average night temperature (°C) | -4.2 | -8.8 | -3.4 | 3.7 | 7.9 | 12.7 | 17.8 | 15.4 | 13.8 | 8.3 | -1.3 | -1.4 |
| Absolute minimum temperature (°C) | -14.9 | -28.7 | -9.8 | -4.8 | 0.5 | 7.1 | 13.0 | 10.8 | 6.4 | 0.5 | -6.1 | -8.5 |
| 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) | 9.4 | 10.5 | 11.9 | 13.4 | 14.7 | 15.3 | 15.0 | 13.9 | 12.5 | 11.0 | 9.7 | 9.0 |
| Daylight minimum duration (h) | 9.0 | 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) | 3.9 | 6.3 | 7.2 | 7.6 | 11.5 | 8.2 | 10.1 | 9.6 | 7.7 | 6.9 | 6.9 | 4.7 |
| Precipitation (mm) | 150 | 41 | 100 | 111 | 95 | 181 | 229 | 141 | 113 | 125 | 61 | 173 |
| Sunny days | 9 | 13 | 13 | 14 | 21 | 4 | 4 | 12 | 15 | 15 | 21 | 16 |
| Rainy days | 16 | 7 | 12 | 16 | 10 | 26 | 27 | 19 | 15 | 16 | 7 | 14 |
| Snow days | 6 | 8 | 6 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 1 |
The best time to visit Merrimack County during the most sunny months:
Months with the longest average daylight duration in Merrimack County:
The largest precipitation sum in Merrimack County is at