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Climate & Weather Averages in Merrimack, New Hampshire, USA

Currently: 75 °F. Light rain. Overcast. (Weather station: Manchester Airport, USA). See more current weather

Annual Weather Averages Near Merrimack

Averages are for Manchester Airport, which is 5 miles from Merrimack.

Based on weather reports collected during 1992–2021.

All Year Climate & Weather Averages in Merrimack

High Temp: 84 °F

Low Temp: 16 °F

Mean Temp: 49 °F

Precipitation: 3.32"

Humidity: 64%

Dew Point: 37 °F

Wind: 10 mph

Pressure: 30.04 "Hg

Visibility: 10 mi

January Climate & Weather Averages in Merrimack

High Temp: 34 °F

Low Temp: 16 °F

Mean Temp: 25 °F

Precipitation: 2.46"

Humidity: 65%

Dew Point: 15 °F

Wind: 11 mph

Pressure: 30.07 "Hg

Visibility: 10 mi

February Climate & Weather Averages in Merrimack

High Temp: 37 °F

Low Temp: 18 °F

Mean Temp: 27 °F

Precipitation: 2.62"

Humidity: 61%

Dew Point: 16 °F

Wind: 12 mph

Pressure: 30.06 "Hg

Visibility: 10 mi

March Climate & Weather Averages in Merrimack

High Temp: 45 °F

Low Temp: 26 °F

Mean Temp: 35 °F

Precipitation: 3.39"

Humidity: 58%

Dew Point: 22 °F

Wind: 12 mph

Pressure: 30.06 "Hg

Visibility: 10 mi

April Climate & Weather Averages in Merrimack

High Temp: 58 °F

Low Temp: 36 °F

Mean Temp: 47 °F

Precipitation: 3.41"

Humidity: 54%

Dew Point: 31 °F

Wind: 12 mph

Pressure: 30.00 "Hg

Visibility: 10 mi

May Climate & Weather Averages in Merrimack

High Temp: 69 °F

Low Temp: 47 °F

Mean Temp: 58 °F

Precipitation: 3.41"

Humidity: 59%

Dew Point: 43 °F

Wind: 10 mph

Pressure: 30.01 "Hg

Visibility: 11 mi

June Climate & Weather Averages in Merrimack

High Temp: 79 °F

Low Temp: 57 °F

Mean Temp: 67 °F

Precipitation: 3.64"

Humidity: 64%

Dew Point: 55 °F

Wind: 9 mph

Pressure: 29.96 "Hg

Visibility: 10 mi

July Climate & Weather Averages in Merrimack

High Temp: 84 °F

Low Temp: 62 °F

Mean Temp: 73 °F

Precipitation: 3.61"

Humidity: 64%

Dew Point: 61 °F

Wind: 9 mph

Pressure: 29.96 "Hg

Visibility: 10 mi

August Climate & Weather Averages in Merrimack

High Temp: 82 °F

Low Temp: 61 °F

Mean Temp: 72 °F

Precipitation: 3.07"

Humidity: 66%

Dew Point: 60 °F

Wind: 8 mph

Pressure: 30.01 "Hg

Visibility: 10 mi

September Climate & Weather Averages in Merrimack

High Temp: 74 °F

Low Temp: 53 °F

Mean Temp: 64 °F

Precipitation: 3.45"

Humidity: 69%

Dew Point: 53 °F

Wind: 9 mph

Pressure: 30.07 "Hg

Visibility: 10 mi

October Climate & Weather Averages in Merrimack

High Temp: 62 °F

Low Temp: 41 °F

Mean Temp: 51 °F

Precipitation: 4.10"

Humidity: 69%

Dew Point: 42 °F

Wind: 9 mph

Pressure: 30.08 "Hg

Visibility: 10 mi

November Climate & Weather Averages in Merrimack

High Temp: 50 °F

Low Temp: 31 °F

Mean Temp: 41 °F

Precipitation: 3.32"

Humidity: 67%

Dew Point: 30 °F

Wind: 10 mph

Pressure: 30.11 "Hg

Visibility: 10 mi

December Climate & Weather Averages in Merrimack

High Temp: 39 °F

Low Temp: 23 °F

Mean Temp: 31 °F

Precipitation: 3.42"

Humidity: 67%

Dew Point: 22 °F

Wind: 10 mph

Pressure: 30.09 "Hg

Visibility: 9 mi

Quick Climate Info

Hottest MonthJuly (73 °F avg)
Coldest MonthJanuary (25 °F avg)
Wettest MonthOctober (4.10" avg)
Windiest MonthMarch (12 mph avg)
Annual precip.39.87" (per year)

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