May weather forecastLancaster, MA
May
Weather in May
The last month of the spring, May, is a refreshing month in Lancaster, Massachusetts, with an average temperature ranging between min 47.8°F (8.8°C) and max 67.5°F (19.7°C).Temperature
May's arrival sees a rise in the average high-temperature, jumping from April's refreshing 55.6°F (13.1°C) to a comfortable 67.5°F (19.7°C). Lancaster's nighttime temperature in May drops to an average of 47.8°F (8.8°C).Humidity
In Lancaster, Massachusetts, the average relative humidity in May is 74%.Rainfall
In May, the rain falls for 15.8 days. Throughout May, 2.2" (56mm) of precipitation is accumulated. In Lancaster, during the entire year, the rain falls for 150.4 days and collects up to 28.86" (733mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. May is the last month it regularly snows. During 0.1 snowfall days, in May, Lancaster aggregates 0.12" (3mm) of snow. In Lancaster, during the entire year, snow falls for 36.5 days and aggregates up to 23.82" (605mm) of snow.Daylight
In May, the average length of the day is 14h and 37min.On the first day of the month, sunrise is at 5:40 am and sunset at 7:46 pm. On the last day of May, sunrise is at 5:12 am and sunset at 8:16 pm EDT.
Sunshine
In May, the average sunshine is 8.3h.UV index
The average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the average person.Note: The average daily UV index of 5 in May transforms into the following instructions:
Act with care - Obligation to protect against skin and eye damage is highlighted. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Lancaster, MA
- Average high temperature in May: 67.5°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (31.5°F).
- Average low temperature in May: 47.8°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in May
Lancaster, MA
- Average pressure in May: 30.01"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in May
Lancaster, MA
- Average wind speed in May: 6.7mph
The windiest month (with the highest average wind speed) is January (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in May
Lancaster, MA
- Average humidity in May: 74%
The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is April (71%).
Average rainfall in May
Lancaster, MA
- Average rainfall in May: 2.2"
The wettest month (with the highest rainfall) is December (2.91").
The driest month (with the least rainfall) is September (1.57").
Average rainfall days in May
Lancaster, MA
- Average rainfall days in May: 15.8 days
The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is February (7.3 days).
Average snowfall in May
Lancaster, MA
- Average snowfall in May: 0.12"
The month with the highest snowfall is February (6.1").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Lancaster, MA
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is February (9.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Lancaster, MA
- Average daylight in May: 14h and 36min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in May: 8h and 18min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in May
Lancaster, MA
- Average sunshine days in May: 13.8 days
The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is July (12.8 days).
Average UV index in May
Lancaster, 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
Lancaster, MA
- Average cloud cover in May: 47
The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in May
Lancaster, MA
- Average visibility in May: 5mi
The months with the highest visibility are March, April, October, November and December (6mi).
The months with the lowest visibility are January, February, May, June, July, August and September (5mi).
