Merrimack, NH Climate


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United States / New Hampshire / Manchester-Nashua Metro Area / Hillsborough County / Merrimack / Zip Codes
Merrimack, NH has a humid continental climate with four distinct seasons. Summers in Merrimack are generally warm and humid with temperatures reaching the 80s and 90s degrees Fahrenheit during the hottest days of summer. Winters are cold and snowy, usually with temperatures below freezing and snowfall throughout the season. Spring is mild with temperatures warming up to the 50s, while autumn is crisp with temperatures ranging from the 50s to 70s degrees Fahrenheit. Precipitation is evenly distributed throughout the year, averaging around 40 inches annually.

Merrimack, New Hampshire gets 46 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Merrimack averages 58 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 199 sunny days per year in Merrimack. The US average is 205 sunny days.

Merrimack gets some kind of precipitation, on average, 126 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 83 degrees
Winter Low: the January low is 13
Rain: averages 46 inches of rain a year
Snow: averages 58 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Merrimack is 6.7 (10=best), which means it is more comfortable than most places in New Hampshire.

9.2 Summer - 4.5 Winter
August, July and June are the most pleasant months in Merrimack, while January and February are the least comfortable months.

  ClimateMerrimack, New HampshireUnited States
  46.1 in.38.1 in.
  57.5 in.27.8 in.
  125.6 days106.2 days
  199 days205 days
  82.5°85.8°
  12.8°21.7°
  6.77
  3.24.3
  154 ft.2443 ft.
Climate
YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

July is the hottest month for Merrimack with an average high temperature of 82.5°, which ranks it as one of the hottest places in New Hampshire. In Merrimack, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Merrimack are June, August and July.
In Merrimack, there are 10.5 days annually when the high temperature is over 90°, which is one of the hottest places in New Hampshire.
January has the coldest nighttime temperatures for Merrimack with an average of 12.8°. This is warmer than most places in New Hampshire.
In Merrimack, there are 149.9 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in New Hampshire.
In Merrimack, there are 7.9 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in New Hampshire.
Humidity in Merrimack is generally low and comfortable. But there some days when the humidity becomes unpleasant, especially in July and August. The most humid months (but still comfortable) are July, August and June.
October is the wettest month in Merrimack with 4.3 inches of rain, and the driest month is February with 3.1 inches. The wettest season is Summer with 27% of yearly precipitation and 22% occurs in Spring, which is the driest season. The annual rainfall of 46.1 inches in Merrimack means that it is about average compared to other places in New Hampshire.
May is the rainiest month in Merrimack with 12.2 days of rain, and September is the driest month with only 9.1 rainy days. There are 125.6 rainy days annually in Merrimack, which is less rainy than most places in New Hampshire. The rainiest season is Summer when it rains 27% of the time and the driest is Spring with only a 23% chance of a rainy day.
An annual snowfall of 57.5 inches in Merrimack means that it is less snowy than most places in New Hampshire. January is the snowiest month in Merrimack with 17.2 inches of snow, and 6 months of the year have significant snowfall.
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