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 brings a temperature change, with average high-temperatures moving from April's refreshing 59°F (15°C) to an agreeable 69.8°F (21°C). Nighttime temperature in Mertztown lowers to an average of 50.7°F (10.4°C) in May.Humidity
In May, the average relative humidity in Mertztown is 79%.Rainfall
In May, in Mertztown, the rain falls for 17.3 days. Throughout May, 2.91" (74mm) of precipitation is accumulated. In Mertztown, during the entire year, the rain falls for 155.8 days and collects up to 30.75" (781mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. May is the last month it regularly snows in Mertztown. During 0.1 snowfall days, in May, Mertztown aggregates 0.12" (3mm) of snow. Throughout the year, there are 29.4 snowfall days, and 15.87" (403mm) of snow is accumulated.Daylight
In Mertztown, Pennsylvania, the average length of the day in May is 14h and 27min.On the first day of the month, sunrise is at 6:00 am and sunset at 7:58 pm. On the last day of May, in Mertztown, sunrise is at 5:34 am and sunset at 8:26 pm EDT.
Sunshine
In May, the average sunshine in Mertztown is 8.2h.UV index
In May, the average daily maximum UV index in Mertztown is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: A typical high UV index of 5 in May suggests the following recommendations:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Frequently asked questions
What are May temperatures in Mertztown?
What is the average humidity in May in Mertztown?
How many days does it rain in May in Mertztown?
What is the last month it snows in Mertztown?
What is the average length of the day in May in Mertztown?
When are sunrise and sunset in May in Mertztown?
How many hours of sunshine does Mertztown have in May?
How high is the UV index in May in Mertztown?
Average temperature in May
Mertztown, 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 (34.3°F).
- Average low temperature in May: 50.7°F
The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in May
Mertztown, 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
Mertztown, PA
- Average wind speed in May: 6.2mph
The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in May
Mertztown, PA
- Average humidity in May: 79%
The month with the highest relative humidity is February (82%).
The months with the lowest relative humidity are April and July (76%).
Average rainfall in May
Mertztown, PA
- Average rainfall in May: 2.91"
The wettest month (with the highest rainfall) is April (2.99").
The driest month (with the least rainfall) is September (1.77").
Average rainfall days in May
Mertztown, PA
- Average rainfall days in May: 17.3 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (8.5 days).
Average snowfall in May
Mertztown, PA
- Average snowfall in May: 0.12"
The month with the highest snowfall is March (4.29").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Mertztown, PA
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is January (8.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Mertztown, PA
- Average daylight in May: 14h and 3min
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 1min
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 24min).
Average sunshine days in May
Mertztown, PA
- Average sunshine days in May: 11.3 days
The month with the most sunshine days is November (17.9 days).
The month with the least sunshine days is April (11.2 days).
Average UV index in May
Mertztown, 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
Mertztown, PA
- Average cloud cover in May: 48
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in May
Mertztown, PA
- Average visibility in May: 5mi
The months with the highest visibility are April, June, July and November (6mi).
The months with the lowest visibility are January, February, March, May, August, September, October and December (5mi).
Mertztown, Pennsylvania, USA
Weather forecast for your location
2. Allow the app to use your location
