Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
May's onset witnesses a shift in the average high-temperature, moving from a mild 60.1°F (15.6°C) in April to a pleasant 70.7°F (21.5°C). During the month of May, the nighttime temperature in Harleysville falls to an average of 52°F (11.1°C).Humidity
In May, the average relative humidity is 78%.Rainfall
In May, in Harleysville, the rain falls for 14 days. Throughout May, 1.38" (35mm) of precipitation is accumulated. In Harleysville, during the entire year, the rain falls for 128.6 days and collects up to 15.16" (385mm) of precipitation.Snowfall
January through May, November and December are months with snowfall. May is the last month it regularly snows. During 0.1 snowfall days, in May, Harleysville aggregates 0.16" (4mm) of snow. Throughout the year, in Harleysville, there are 17 snowfall days, and 5.43" (138mm) of snow is accumulated.Daylight
In Harleysville, the average length of the day in May is 14h and 26min.On the first day of the month, sunrise is at 5:59 am and sunset at 7:57 pm. On the last day of May, in Harleysville, Pennsylvania, sunrise is at 5:33 am and sunset at 8:24 pm EDT.
Sunshine
In May, the average sunshine in Harleysville is 8.4h.UV index
May through August, with an average maximum UV index of 6, are months with the highest UV index in Harleysville. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for average individuals.Note: In May, the maximum UV index of 6 translates into these guidelines:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Frequently asked questions
What is the usual temperature for Harleysville in May?
What is the average humidity in May in Harleysville?
How many days does it rain in May in Harleysville?
What is the last month it snows in Harleysville?
What is the average length of the day in May in Harleysville?
When are sunrise and sunset in May in Harleysville?
How many hours of sunshine does Harleysville have in May?
What are the months with the highest UV index in Harleysville?
What is the UV index intensity in May in Harleysville?
Average temperature in May
Harleysville, PA
- Average high temperature in May: 70.7°F
The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is January (35.2°F).
- Average low temperature in May: 52°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (22.8°F).
Average pressure in May
Harleysville, PA
- Average pressure in May: 30.01"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in May
Harleysville, PA
- Average wind speed in May: 6.3mph
The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in May
Harleysville, PA
- Average humidity in May: 78%
The month with the highest relative humidity is February (81%).
The months with the lowest relative humidity are April and July (75%).
Average rainfall in May
Harleysville, PA
- Average rainfall in May: 1.38"
The wettest month (with the highest rainfall) is July (1.97").
The driest month (with the least rainfall) is January (0.87").
Average rainfall days in May
Harleysville, PA
- Average rainfall days in May: 14 days
The month with the highest number of rainy days is July (15.7 days).
The month with the least rainy days is January (5.7 days).
Average snowfall in May
Harleysville, PA
- Average snowfall in May: 0.16"
The month with the highest snowfall is March (1.46").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in May
Harleysville, PA
- 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 and September (0 days).
Average daylight in May /
Average sunshine in May
Harleysville, PA
- Average daylight in May: 14h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in May: 8h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in May
Harleysville, PA
- Average sunshine days in May: 14.8 days
The month with the most sunshine days is November (21.4 days).
The month with the least sunshine days is July (12.8 days).
Average UV index in May
Harleysville, PA
- Average UV index in May: 6
The months with the highest UV index are May, 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
Harleysville, PA
- Average cloud cover in May: 48
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in May
Harleysville, PA
- Average visibility in May: 5mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
Harleysville, Pennsylvania, USA
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