Merrimack Climate: Weather by Month and Best Time to Visit
Best months for Merrimack: September, August, June, July.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 1°C | -7°C | 80 mm | 9 | – | – | 3.9 |
| February | 3°C | -6°C | 76 mm | 9 | – | – | 4.3 |
| March | 7°C | -2°C | 103 mm | 10 | – | – | 4.9 |
| April | 14°C | 4°C | 94 mm | 10 | – | – | 6.4 |
| May | 20°C | 9°C | 80 mm | 11 | – | – | 7.3 |
| June | 25°C | 15°C | 91 mm | 11 | – | – | 7.6 |
| July | 28°C | 18°C | 86 mm | 11 | – | – | 7.6 |
| August | 27°C | 17°C | 86 mm | 10 | – | – | 7.8 |
| September | 23°C | 13°C | 86 mm | 8 | – | – | 8.0 |
| October | 16°C | 7°C | 97 mm | 10 | – | – | 6.8 |
| November | 10°C | 1°C | 85 mm | 9 | – | – | 5.7 |
| December | 4°C | -4°C | 106 mm | 10 | – | – | 4.3 |