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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, the same as December, is an icy winter month in Merrimac, Massachusetts, with an average temperature varying between 20.5°F (-6.4°C) and 32.5°F (0.3°C). The coldest time of the year is January, 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
February, the last month of the winter in Merrimac, is also a wintry month, with an average temperature fluctuating between 34.7°F (1.5°C) and 21.6°F (-5.8°C). February's onset records a minor alteration in the average high-temperature to a still icy 34.7°F (1.5°C) from January's 32.5°F (0.3°C). Weather in February »
Weather in March
March, the first month of the spring in Merrimac, is also an icy month, with an average temperature varying between 28.8°F (-1.8°C) and 41.9°F (5.5°C). With the onset of March, Merrimac's weather sees a minor temperature rise, transitioning from 34.7°F (1.5°C) in February to a still wintry 41.9°F (5.5°C). Weather in March »
Weather in April
April is a fresh spring month in Merrimac, Massachusetts, with an average temperature varying between 38.8°F (3.8°C) and 54.5°F (12.5°C). The start of April brings a rise in the average high-temperature, moving 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 a refreshing 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). The start of May signals an increase in the average high-temperature, moving from a cool 54.5°F (12.5°C) in April to a comfortable 65.5°F (18.6°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Merrimac, Massachusetts, with an average temperature varying between 55.9°F (13.3°C) and 73.8°F (23.2°C). June witnesses a minor rise in the average high-temperature, transitioning from a comfortable 65.5°F (18.6°C) in May to a warm 73.8°F (23.2°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Merrimac, Massachusetts, with an average temperature fluctuating between 63°F (17.2°C) and 80.8°F (27.1°C). 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). In July, the heat index is appraised at 84.2°F (29°C). Weather in July »
Weather in August
August, the last month of the summer in Merrimac, is another warm month, with an average temperature ranging between min 61.9°F (16.6°C) and max 79.9°F (26.6°C). In Merrimac, August's average high-temperature stands at a still warm 79.9°F (26.6°C), closely related to the preceding month. Weather in August »
Weather in September
September, the first month of the autumn in Merrimac, is still a pleasant month, with temperature in the range of an average low of 55.6°F (13.1°C) and an average high of 72.3°F (22.4°C). Merrimac records a mild change in average high-temperature during September, easing 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 an average temperature ranging between min 46.6°F (8.1°C) and max 59.9°F (15.5°C). Merrimac's October weather shows a moderate shift in high-temperatures, falling from September's agreeable 72.3°F (22.4°C) to a mild 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 48.2°F (9°C) and 35.6°F (2°C). Merrimac's progression into November includes a drop in the average high-temperature, from a moderate 59.9°F (15.5°C) in October to a frosty 48.2°F (9°C). Weather in November »
Weather in December
The first month of the winter, December, is also a wintry month in Merrimac, Massachusetts, with an average temperature fluctuating between 37.9°F (3.3°C) and 27.7°F (-2.4°C). December's onset brings a slight change in high-temperatures, falling from a frosty 48.2°F (9°C) in November to a cold 37.9°F (3.3°C). Weather in December »
Updated: Aug 1, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the coldest months?
January, with an average high of 32.5°F (0.3°C) and a low of 20.5°F (-6.4°C), signifies the coldest month of the year.
How many days does it rain?
Throughout the year, there are 78.3 rainfall days, and 5.43" (138mm) of precipitation is accumulated.
When does it snow?
Months with snowfall are January through May, November and December.
How much does it snow?
In Merrimac, during the entire year, snow falls for 17.2 days and aggregates up to 2.6" (66mm) of snow.
What are the months with the lowest UV index?
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.
What is the most humid month?
With an average relative humidity of 79%, February is the most humid month.
What is the month with the least sunshine?
February has the least sunshine of the year, with an average of 4.7h of sunshine.
When is Daylight Saving Time (DST)?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, 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?
The least humid month is April, with an average relative humidity of 71%.
When it does not snow?
In Merrimac, snow does not fall in June through October.
When are the longest days?
With an average of 15h and 18min of daylight, June has the longest days of the year.
What are the months with the highest UV index?
June through August, with an average maximum UV index of 6, are months with the highest UV index.
What is the hottest time of year?
July is the month when Merrimac's temperatures reach their peak, with averages of 80.8°F (27.1°C) and lows of 63°F (17.2°C).
What month has the most sunshine?
August has the most sunshine of the year, with an average of 10.6h of sunshine.
What is the driest month?
The month with the least rainfall is September, when the rain falls for 6 days and typically collects 0.2" (5mm) of precipitation.
What is the rainiest month?
November is the month with the most rainfall. Rain falls for 5 days and accumulates 0.67" (17mm) of precipitation.
When does it snow the most?
The month with the most snowfall is December, when snow falls for 2.6 days and typically aggregates up to 0.71" (18mm) of snow.
What is the month with the shortest days?
With an average of 9h and 6min of daylight, December has the shortest days of the year.
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).
Average pressure
Merrimac, MA
- Average pressure in January:
30"Hg - Average pressure in February:
29.98"Hg - Average pressure in March:
30.03"Hg - Average pressure in April:
29.96"Hg - Average pressure in May:
30"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.94"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.05"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.06"Hg - Average pressure in December:
30.03"Hg
The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Merrimac, MA
- Average wind speed in January:
9.5mph - Average wind speed in February:
9.2mph - Average wind speed in March:
8.9mph - Average wind speed in April:
8.2mph - Average wind speed in May:
6.9mph - Average wind speed in June:
6.3mph
- Average wind speed in July:
5.7mph - Average wind speed in August:
5.7mph - Average wind speed in September:
6.2mph - Average wind speed in October:
7.6mph - Average wind speed in November:
8.1mph - Average wind speed in December:
8.9mph
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).
Average humidity
Merrimac, MA
The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is April (71%).
Average rainfall
Merrimac, MA
- Average rainfall in January:
0.39" - Average rainfall in February:
0.35" - Average rainfall in March:
0.39" - Average rainfall in April:
0.55" - Average rainfall in May:
0.39" - Average rainfall in June:
0.55"
- Average rainfall in July:
0.47" - Average rainfall in August:
0.35" - Average rainfall in September:
0.2" - Average rainfall in October:
0.59" - Average rainfall in November:
0.67" - Average rainfall in December:
0.51"
The wettest month (with the highest rainfall) is November (0.67").
The driest month (with the least rainfall) is September (0.2").
Average rainfall days
Merrimac, MA
- Average rainfall days in January:
3.6 days - Average rainfall days in February:
4.2 days - Average rainfall days in March:
7.2 days - Average rainfall days in April:
8.7 days - Average rainfall days in May:
7.8 days - Average rainfall days in June:
7.9 days
- Average rainfall days in July:
8.8 days - Average rainfall days in August:
7.8 days - Average rainfall days in September:
6 days - Average rainfall days in October:
6.5 days - Average rainfall days in November:
5 days - Average rainfall days in December:
4.8 days
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).
Average snowfall
Merrimac, MA
- Average snowfall in January:
0.43" - Average snowfall in February:
0.67" - Average snowfall in March:
0.39" - Average snowfall in April:
0.2" - Average snowfall in May:
0.04" - Average snowfall in June:
0"
The month with the highest snowfall is December (0.71").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days
Merrimac, MA
- Average snowfall days in January:
3.7 days - Average snowfall days in February:
5.3 days - Average snowfall days in March:
4.1 days - Average snowfall days in April:
0.8 days - Average snowfall days in May:
0.1 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.6 days - Average snowfall days in December:
2.6 days
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).
Average daylight / Average sunshine
Merrimac, MA
- Average daylight in January:
9h and 3min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 4min - Average daylight in June:
15h and 2min
- Average daylight in July:
15h and 0min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 1min
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).
- Average sunshine in January:
5h and 1min - Average sunshine in February:
4h and 4min - Average sunshine in March:
5h and 5min - Average sunshine in April:
8h and 1min - Average sunshine in May:
8h and 3min - Average sunshine in June:
9h and 1min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
10h and 4min - Average sunshine in September:
8h and 3min - Average sunshine in October:
6h and 0min - Average sunshine in November:
5h and 3min - Average sunshine in December:
4h and 5min
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).
Average sunshine days
Merrimac, MA
- Average sunshine days in January:
24.5 days - Average sunshine days in February:
20.4 days - Average sunshine days in March:
20.6 days - Average sunshine days in April:
18.4 days - Average sunshine days in May:
20.3 days - Average sunshine days in June:
19.2 days
- Average sunshine days in July:
18.8 days - Average sunshine days in August:
20.3 days - Average sunshine days in September:
21.9 days - Average sunshine days in October:
21.7 days - Average sunshine days in November:
22.6 days - Average sunshine days in December:
23 days
The month with the most sunshine days is January (24.5 days).
The month with the least sunshine days is April (18.4 days).
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).
Average cloud cover
Merrimac, MA
The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 31).
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).
Merrimac, Massachusetts, USA
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