May weather forecastMerrimac, MA
May
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).Temperature
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). Merrimac cools down to an average low-temperature of 48.7°F (9.3°C) throughout the month of May.Humidity
The average relative humidity in May is 74%.Rainfall
In May, the rain falls for 7.8 days. Throughout May, 0.39" (10mm) of precipitation is accumulated. Throughout the year, there are 78.3 rainfall days, and 5.43" (138mm) of precipitation is accumulated.Snowfall
Months with snowfall in Merrimac are January through May, November and December. May is the last month it regularly snows. During 0.1 snowfall days, in May, Merrimac aggregates 0.04" (1mm) of snow. In Merrimac, during the entire year, snow falls for 17.2 days and aggregates up to 2.6" (66mm) of snow.Daylight
In May, the average length of the day is 14h and 40min.On the first day of the month, sunrise is at 5:36 am and sunset at 7:45 pm. On the last day of May, sunrise is at 5:08 am and sunset at 8:15 pm EDT.
Sunshine
In May, the average sunshine is 8.5h.UV index
In Merrimac, the average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A daily high UV index of 5 in May leads to these guidelines:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Merrimac, MA
- Average high temperature in May: 65.5°F
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).
- Average low temperature in May: 48.7°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 in May
Merrimac, MA
- Average pressure in May: 30"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 in May
Merrimac, MA
- Average wind speed in May: 6.9mph
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 in May
Merrimac, MA
- Average humidity in May: 74%
The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is April (71%).
Average rainfall in May
Merrimac, MA
- Average rainfall in May: 0.39"
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 in May
Merrimac, MA
- Average rainfall days in May: 7.8 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 in May
Merrimac, MA
- Average snowfall in May: 0.04"
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 in May
Merrimac, MA
- Average snowfall days in May: 0.1 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 in May /
Average sunshine in May
Merrimac, MA
- Average daylight in May: 14h and 42min
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 May: 8h and 30min
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 in May
Merrimac, MA
- Average sunshine days in May: 20.3 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 in May
Merrimac, MA
- Average UV index in May: 5
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 in May
Merrimac, MA
- Average cloud cover in May: 46
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 in May
Merrimac, MA
- Average visibility in May: 6mi
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).
