May weather forecastLancaster, PA
May
Weather in May
May marks the official beginning of the warm season in Lancaster, Pennsylvania. Displaying substantial heat compared to the preceding months, temperatures climb to an average high of about 70.3°F (21.3°C). The extended daylight hours and persistent rainfall provide optimal growth conditions for plant life. An increase in relative humidity augments the general sense of warmth. As the temperatures rise steadily, it is an ideal time to engage in various outdoor activities, adorning summer wear.Temperature
The arrival of May signals an increase in the average high-temperature, moving from a moderate 60.3°F (15.7°C) in April to a pleasant 70.3°F (21.3°C). Nighttime temperatures hover around an average low of 52.5°F (11.4°C) in May.Humidity
With an average relative humidity of 81%, May is the most humid month.Rainfall
In Lancaster, in May, during 17.8 rainfall days, 2.8" (71mm) of precipitation is typically accumulated. In Lancaster, during the entire year, the rain falls for 153.4 days and collects up to 28.27" (718mm) of precipitation.Snowfall
In Lancaster, snow does not fall in May through October.Daylight
In Lancaster, the average length of the day in May is 14h and 25min.On the first day of May, sunrise is at 6:04 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 5:38 am and sunset at 8:27 pm EDT.
Sunshine
In May, the average sunshine in Lancaster is 8.2h.UV index
The months with the highest UV index are May through July, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for average individuals.Note: The maximum UV index, 6 during May, leads to the following recommendations:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Lancaster, PA
- Average high temperature in May: 70.3°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (35.4°F).
- Average low temperature in May: 52.5°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (23.2°F).
Average pressure in May
Lancaster, PA
- Average pressure in May: 30.01"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in May
Lancaster, PA
- Average wind speed in May: 6.8mph
The windiest month (with the highest average wind speed) is March (9mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in May
Lancaster, PA
- Average humidity in May: 81%
The month with the highest relative humidity is May (81%).
The month with the lowest relative humidity is April (76%).
Average rainfall in May
Lancaster, PA
- Average rainfall in May: 2.8"
The wettest month (with the highest rainfall) is August (3.35").
The driest months (with the least rainfall) are February and September (1.89").
Average rainfall days in May
Lancaster, PA
- Average rainfall days in May: 17.8 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is February (8 days).
Average snowfall in May
Lancaster, PA
- Average snowfall in May: 0"
The month with the highest snowfall is March (3.66").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Lancaster, PA
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in May /
Average sunshine in May
Lancaster, PA
- Average daylight in May: 14h and 24min
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 12min
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
Lancaster, PA
- Average sunshine days in May: 11.3 days
The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is May (11.3 days).
Average UV index in May
Lancaster, PA
- Average UV index in May: 6
The months with the highest UV index are May, June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Lancaster, 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 33).
Average visibility in May
Lancaster, PA
- Average visibility in May: 5mi
The months with the highest visibility are January, February, March, April, June, July, October, November and December (6mi).
The months with the lowest visibility are May, August and September (5mi).
