Best year time to visit Merrimack

General weather information about Merrimack

Average annual temperature is 10.5 °C

Absolute maximum temperature: 33.3 °C

Absolute minimum temperature: -26.1 °C

Number of sunny days: 165 days

Number of rainy days: 185 days

Number of snow days: 15 days

Look at detailed online map of Merrimack

* Weather data for Merrimack United States is based on climate observations for 2026 year

Merrimack air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)10.914.616.231.631.033.332.429.032.928.318.316.1
Average daytime temperature (°C)4.95.17.515.621.423.728.025.523.218.68.77.5
Average temperature (°C)0.7-1.02.29.414.517.922.920.418.213.43.52.8
Average night temperature (°C)-3.2-6.0-2.24.68.413.218.616.214.59.2-0.3-0.4
Absolute minimum temperature (°C)-14.2-26.1-6.8-4.11.37.213.611.86.90.8-5.6-7.4

Merrimack monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)9.011.012.014.015.015.015.014.013.011.010.09.0
Daylight mean duration (h)9.410.511.913.414.615.315.013.912.511.09.89.1
Daylight minimum duration (h)9.09.011.012.014.015.014.013.011.010.09.09.0
Sunshine mean duration (h)4.16.36.97.811.38.29.99.37.57.16.95.1
Precipitation (mm)1644412877881602081891919943160
Sunny days914141620761113162217
Rainy days16101414112325201715713
Snow days643000000011

Merrimack - weather forecast by months

Merrimack weather in januaryMerrimack weather in februaryMerrimack weather in marchMerrimack weather in aprilMerrimack weather in mayMerrimack weather in juneMerrimack weather in julyMerrimack weather in augustMerrimack weather in septemberMerrimack weather in octoberMerrimack weather in novemberMerrimack weather in december

Best time to visit Merrimack:

The best time to visit Merrimack during the most sunny months:

  • May — 11.3(h)
  • July — 9.9(h)

Months with the longest average daylight duration in Merrimack:

  • June — 15.3(h)

The largest precipitation sum in Merrimack is at

  • January — 164(mm)
  • July — 208(mm)
  • August — 189(mm)
  • September — 191(mm)

    • Weather forecast in the closest to Merrimack admin centers

    Weather forecast in the closest towns to Merrimack

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    MapTrains schedule
    Plan your trip
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    Frequently asked questions

    When is the best time to visit Merrimack?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Merrimack.
    What is the weather like in Merrimack?
    See average temperature, rainfall and daylight hours for Merrimack by month in the table above.
    How many sunny days does Merrimack have?
    The monthly weather statistics above show sunshine and rainfall patterns for Merrimack throughout the year.