Climate and monthly weather forecast
Merrimac, MA

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Weather in January

January, the same as December, is another cold winter month in Merrimac, Massachusetts, with an average temperature fluctuating between 20.5°F (-6.4°C) and 32.5°F (0.3°C). In Merrimac, January is the coldest month, with temperatures averaging a high of 32.5°F (0.3°C) and a low of 20.5°F (-6.4°C). Weather in January »

Weather in February

The last month of the winter, February, is another cold month in Merrimac, Massachusetts, with an average temperature ranging between max 34.7°F (1.5°C) and min 21.6°F (-5.8°C). Merrimac sees the arrival of February with an average high-temperature of a still icy 34.7°F (1.5°C), indicating a subtle variation from January. Weather in February »

Weather in March

March, the first month of the spring in Merrimac, is still a cold month, with an average temperature ranging between min 28.8°F (-1.8°C) and max 41.9°F (5.5°C). March's arrival coincides with a marginal rise in the average high-temperature, moving from February's 34.7°F (1.5°C) to a still cold 41.9°F (5.5°C). Weather in March »

Weather in April

April in Merrimac, Massachusetts, is a cool spring month, with temperature in the range of an average low of 38.8°F (3.8°C) and an average high of 54.5°F (12.5°C). With the beginning of April, Merrimac's average high-temperature sees an increase, transitioning from a wintry 41.9°F (5.5°C) in March to a fresh 54.5°F (12.5°C). Weather in April »

Weather in May

May, the last month of the spring in Merrimac, is an enjoyable month, with temperature in the range of an average high of 65.5°F (18.6°C) and an average low of 48.7°F (9.3°C). With the arrival of May, the average high-temperature transitions from a cool 54.5°F (12.5°C) in April to a refreshing 65.5°F (18.6°C). Weather in May »

Weather in June

June, the first month of the summer in Merrimac, is a moderately hot month, with an average temperature ranging between max 73.8°F (23.2°C) and min 55.9°F (13.3°C). As Merrimac transitions into June, a marginal rise in the average high-temperature is observed, moving from a comfortable 65.5°F (18.6°C) in May to a moderately hot 73.8°F (23.2°C). Weather in June »

Weather in July

July, the same as June, is another warm summer month in Merrimac, Massachusetts, with temperature in the range of an average low of 63°F (17.2°C) and an average high of 80.8°F (27.1°C). In Merrimac, July records the highest average temperatures, peaking at 80.8°F (27.1°C) and reaching a low of 63°F (17.2°C). July's mean heat index is computed to be 84.2°F (29°C). Weather in July »

Weather in August

August, the last month of the summer in Merrimac, is also a moderately hot month, with an average temperature varying between 61.9°F (16.6°C) and 79.9°F (26.6°C). Merrimac observes an average high-temperature of a still moderately hot 79.9°F (26.6°C) in August, barely different from 80.8°F (27.1°C) in July. Weather in August »

Weather in September

The first month of the autumn, September, is also an agreeable month in Merrimac, Massachusetts, with an average temperature ranging between max 72.3°F (22.4°C) and min 55.6°F (13.1°C). With September's onset, the weather reveals a slight temperature decrease, transitioning from a warm 79.9°F (26.6°C) in August to a pleasant 72.3°F (22.4°C). Weather in September »

Weather in October

October, like September, is another mild autumn month in Merrimac, Massachusetts, with temperature in the range of an average high of 59.9°F (15.5°C) and an average low of 46.6°F (8.1°C). Onset of October comes with a temperature decline, the average high falling from a pleasant 72.3°F (22.4°C) in September to a moderate 59.9°F (15.5°C). Weather in October »

Weather in November

The last month of the autumn, November, is another chilly month in Merrimac, Massachusetts, with an average temperature fluctuating between 35.6°F (2°C) and 48.2°F (9°C). Merrimac's weather changes with the onset of November, slightly falling from a mild 59.9°F (15.5°C) in October to a chilly 48.2°F (9°C). Weather in November »

Weather in December

The first month of the winter, December, is also an icy month in Merrimac, Massachusetts, with an average temperature fluctuating between 37.9°F (3.3°C) and 27.7°F (-2.4°C). During Merrimac's transition into December, the average high-temperature lessens, moving from a chilly 48.2°F (9°C) in November to a cold 37.9°F (3.3°C). Weather in December »
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Frequently asked questions

What is the coldest month in Merrimac?

During the coldest month in Merrimac, January, temperatures average a high of 32.5°F (0.3°C) and a low of 20.5°F (-6.4°C).

How much does it rain in Merrimac?

In Merrimac, during the entire year, the rain falls for 78.3 days and collects up to 5.43" (138mm) of precipitation.

When does it snow in Merrimac?

Months with snowfall are January through May, November and December.

How many days does it snow in Merrimac?

Throughout the year, there are 17.2 snowfall days, and 2.6" (66mm) of snow is accumulated.

What are the months with the lowest UV index in Merrimac?

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Merrimac.

What is the most humid month in Merrimac?

With an average relative humidity of 79%, February is the most humid month in Merrimac.

What is the month with the least sunshine in Merrimac?

February has the least sunshine of the year, with an average of 4.7h of sunshine.

When is Daylight Saving Time (DST) in Merrimac?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Merrimac, Massachusetts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.

What is the least humid month in Merrimac?

April is the least humid month in Merrimac, with an average relative humidity of 71%.

When it does not snow in Merrimac?

In Merrimac, Massachusetts, snow does not fall in June through October.

When are the longest days in Merrimac?

The month with the longest days in Merrimac, Massachusetts, is June, with an average of 15h and 18min of daylight.

What is the month with the highest UV index in Merrimac?

The months with the highest UV index are June through August, with an average maximum UV index of 6.

What time of the year is the hottest in Merrimac?

Merrimac's warmest temperatures are experienced in July, with average high temperatures of 80.8°F (27.1°C) and lows of 63°F (17.2°C).

What month has the most sunshine in Merrimac?

The month with the most sunshine in Merrimac, Massachusetts, is August, with an average of 10.6h of sunshine.

What is the driest month in Merrimac?

The month with the least rainfall in Merrimac is September, when the rain falls for 6 days and typically collects 0.2" (5mm) of precipitation.

What is the wettest month in Merrimac?

The month with the most rainfall is November, when the rain falls for 5 days and typically aggregates up to 0.67" (17mm) of precipitation.

What is the snowiest month in Merrimac?

December is the month with the most snowfall in Merrimac. Snow falls for 2.6 days and accumulates 0.71" (18mm) of snow.

What is the month with the shortest days in Merrimac?

With an average of 9h and 6min of daylight, December has the shortest days of the year in Merrimac, Massachusetts.

Average temperature
Merrimac, MA

Average temperature - Merrimac, MA

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (32.5°F).

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (20.5°F).

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Average pressure
Merrimac, MA

Average pressure - Merrimac, MA

The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed
Merrimac, MA

Average wind speed - Merrimac, MA

The windiest month (with the highest average wind speed) is January (9.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

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Average rainfall
Merrimac, MA

Average rainfall - Merrimac, MA

The wettest month (with the highest rainfall) is November (0.67").
The driest month (with the least rainfall) is September (0.2").

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Average rainfall days
Merrimac, MA

Average rainfall days - Merrimac, MA

The month with the highest number of rainy days is July (8.8 days).
The month with the least rainy days is January (3.6 days).

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Average snowfall
Merrimac, MA

Average snowfall - Merrimac, MA

The month with the highest snowfall is December (0.71").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days
Merrimac, MA

Average snowfall days - Merrimac, MA

The month with the highest number of snowfall days is February (5.3 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average daylight / Average sunshine
Merrimac, MA

Average daylight / Average sunshine - Merrimac, MA

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

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Average sunshine days
Merrimac, MA

Average sunshine days - Merrimac, MA

The month with the most sunshine days is January (24.5 days).
The month with the least sunshine days is April (18.4 days).

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Average UV index
Merrimac, MA

Average UV index - Merrimac, MA

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average visibility
Merrimac, MA

Average visibility - Merrimac, MA

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Merrimac, Massachusetts, USA

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