Merrimac, Massachusetts Climate
United States
Pop. 6,245 Elev. 36 m / 118 ft
TZ: America/New_York (UTC-4) ·
Merrimac has mild summers with average highs of 82°F (28°C) in July, and frigid winters averaging 20°F (-7°C) in January. Humidity pushes the summer feels-like temperature to 87°F (31°C), while wind chill can drive winter lows to 11°F (-12°C). Rain falls on about 56 days per year (34.8 in / 883 mm total), with snow on 10 days and 48 in (1219 mm) of annual accumulation. The city averages 136 sunny days per year. Ocean water temperatures reach 68°F (20°C) in summer.
| Temperature | 82°F (28°C) high | 20°F (-6°C) low |
| Feels like | 87°F (30°C) high | 11°F (-12°C) low |
| Rain | 56 days | 34.8 in (883 mm) /yr |
| Snow | 10 days | 48.0 in (1219 mm) /yr |
| Sky | 136 sunny | 16 stormy |
| Wind | 3.5 mph (1.6 m/s) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: Jun, Jul, Aug, Sep
Sky & Air by Month
Cloud cover (%)
41
Jan 57
Feb 62
Mar 66
Apr 76
May 60
Jun 55
Jul 44
Aug 53
Sep 45
Oct 49
Nov 53
Dec Humidity (%)
59
Jan 65
Feb 61
Mar 60
Apr 73
May 72
Jun 72
Jul 69
Aug 77
Sep 71
Oct 67
Nov 63
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 19 mi Portsmouth International Airport at Pease (PSM)
Ski resort 7 mi Ski Bradford
National park 88 mi Fort Baldwin State Historic Site
Mountain peak
(5,460 ft) 99 mi Boott Spur
Hospital 5 mi Merrimack Health Lawrence Hospital
Hiking trail 9 mi River Trail
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 33°F 1°C | 20°F -6°C | 1.0 in 25 mm | 6.7 in169 mm | 16 |
| February | 34°F 1°C | 21°F -6°C | 1.3 in 32 mm | 23.7 in601 mm | 9 |
| March | 49°F 9°C | 33°F 1°C | 4.0 in 101 mm | 0.4 in11 mm | 9 |
| April | 58°F 14°C | 43°F 6°C | 4.0 in 101 mm | 5.2 in132 mm | 9 |
| May | 64°F 18°C | 52°F 11°C | 6.8 in 171 mm | — | 4 |
| June | 76°F 24°C | 61°F 16°C | 2.0 in 50 mm | — | 10 |
| July | 82°F 28°C | 67°F 20°C | 2.8 in 71 mm | — | 11 |
| August | 77°F 25°C | 61°F 16°C | 1.6 in 40 mm | — | 18 |
| September | 72°F 22°C | 57°F 14°C | 2.5 in 62 mm | — | 10 |
| October | 62°F 17°C | 48°F 9°C | 4.3 in 110 mm | — | 17 |
| November | 48°F 9°C | 36°F 2°C | 2.6 in 66 mm | 0.1 in2 mm | 12 |
| December | 36°F 2°C | 23°F -5°C | 2.1 in 54 mm | 12.0 in304 mm | 11 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 16 | 0 |
| February | 9 | 0 |
| March | 9 | 0 |
| April | 9 | 2 |
| May | 4 | 4 |
| June | 10 | 0 |
| July | 11 | 3 |
| August | 18 | 1 |
| September | 10 | 2 |
| October | 17 | 2 |
| November | 12 | 1 |
| December | 11 | 1 |
Water Temperatures Data
↑ See chart| Month | Ocean Avg High | Lake Avg High |
|---|---|---|
| January | 44°F 6°C | 32°F 0°C |
| February | 39°F 4°C | 32°F 0°C |
| March | 40°F 5°C | 36°F 2°C |
| April | 46°F 8°C | 44°F 7°C |
| May | 53°F 12°C | 56°F 13°C |
| June | 64°F 18°C | 66°F 19°C |
| July | 68°F 20°C | 75°F 24°C |
| August | 68°F 20°C | 70°F 21°C |
| September | 65°F 18°C | 65°F 19°C |
| October | 63°F 17°C | 55°F 13°C |
| November | 54°F 12°C | 42°F 5°C |
| December | 48°F 9°C | 33°F 0°C |