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
With the transition into May, Harrow experiences an increase in average high-temperatures, moving up from a refreshing 59.5°F (15.3°C) in April to a pleasant 69.8°F (21°C). In May, the nighttime temperature in Harrow lowers to an average of 51.1°F (10.6°C).Humidity
In May, the average relative humidity in Harrow is 79%.Rainfall
In Harrow, during May, the rain falls for 10.1 days and regularly aggregates up to 0.75" (19mm) of precipitation. Throughout the year, in Harrow, there are 91.3 rainfall days, and 7.28" (185mm) of precipitation is accumulated.Snowfall
Months with snowfall in Harrow are January through May, November and December. May is the last month it regularly snows in Harrow. During 0.1 snowfall days, in May, Harrow aggregates 0.2" (5mm) of snow. Throughout the year, in Harrow, there are 14.8 snowfall days, and 2.24" (57mm) of snow is accumulated.Daylight
In Harrow, the average length of the day in May is 14h and 27min.On the first day of the month, sunrise is at 5:58 am and sunset at 7:56 pm. On the last day of May, in Harrow, sunrise is at 5:32 am and sunset at 8:24 pm EDT.
Sunshine
In May, the average sunshine in Harrow is 8.3h.UV index
In May, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: A maximum high UV index of 5 in May translates into the following recommendations:
Take precautions - Protection against sunburn is recommended. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average May temperature in Harrow?
What is the average humidity in May in Harrow?
How many days does it rain in May in Harrow?
What is the last month it snows in Harrow?
How many hours of daylight does Harrow have in May?
When are sunrise and sunset in May in Harrow?
How long on average sun shines in May in Harrow?
What is the UV index intensity in May in Harrow?
Average temperature in May
Harrow, PA
- Average high temperature in May: 69.8°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (34.9°F).
- Average low temperature in May: 51.1°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).
Average pressure in May
Harrow, 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
Harrow, PA
- Average wind speed in May: 6.4mph
The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in May
Harrow, PA
- Average humidity in May: 79%
The month with the highest relative humidity is February (81%).
The months with the lowest relative humidity are April and July (76%).
Average rainfall in May
Harrow, PA
- Average rainfall in May: 0.75"
The wettest month (with the highest rainfall) is July (0.91").
The driest month (with the least rainfall) is September (0.28").
Average rainfall days in May
Harrow, PA
- Average rainfall days in May: 10.1 days
The months with the highest number of rainy days are June and July (10.2 days).
The month with the least rainy days is January (4.3 days).
Average snowfall in May
Harrow, PA
- Average snowfall in May: 0.2"
The month with the highest snowfall is March (0.63").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in May
Harrow, PA
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is February (4.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Harrow, 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 18min).
- Average sunshine in May: 8h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in May
Harrow, PA
- Average sunshine days in May: 17.3 days
The month with the most sunshine days is January (23.8 days).
The month with the least sunshine days is June (16.7 days).
Average UV index in May
Harrow, PA
- Average UV index in May: 5
The months with the highest UV index are June and July (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
Harrow, PA
- Average cloud cover in May: 49
The months with the most cloud cover are February and December (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in May
Harrow, PA
- Average visibility in May: 5mi
The months with the highest visibility are January, February, March, April, November and December (6mi).
The months with the lowest visibility are May, June, July, August, September and October (5mi).
Harrow, Pennsylvania, USA
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