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
Preston in May sees a temperature change, with average high-temperatures moving from an enjoyable 62.6°F (17°C) in April to an agreeable 71.6°F (22°C). Preston records an average nighttime low-temperature of 56.8°F (13.8°C) throughout May.Humidity
May, August and September, with an average relative humidity of 79%, are the most humid months.Rainfall
In May, the rain falls for 14.5 days. Throughout May, 1.34" (34mm) of precipitation is accumulated. Throughout the year, there are 135.7 rainfall days, and 16.34" (415mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through March, May, November and December. May is the first month it typically snows. Throughout May, in the average 0.1 snowfall days, it receives 0.16" (4mm) of snow. Throughout the year, there are 9.5 snowfall days, and 3.35" (85mm) of snow is accumulated.Daylight
In May, the average length of the day in Preston is 14h and 18min.On the first day of the month, sunrise is at 6:05 am and sunset at 7:56 pm. On the last day of May, sunrise is at 5:40 am and sunset at 8:22 pm EDT.
Sunshine
In Preston, the average sunshine in May is 9.3h.UV index
May through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the average person.Note: In May, an average UV index of 6 transforms into the following instructions:
Apply measures and align with sun safety principles. Safeguarding against skin and eye injury is pivotal. 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. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are May temperatures?
What is the most humid month?
What is the average humidity in May?
How much does it rain in May?
When does it start to snow?
What is the average length of the day in May?
What time are sunrise and sunset in May?
How many hours of sunshine does Preston have in May?
When is the highest UV index?
What is the UV index intensity in May?
Average temperature in May
Preston, MD
- Average high temperature in May: 71.6°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 (41.2°F).
- Average low temperature in May: 56.8°F
The month with the highest average low temperature is July (70.3°F).
The coldest month (with the lowest average low temperature) is January (29.3°F).
Average pressure in May
Preston, MD
- Average pressure in May: 30.02"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
Preston, MD
- Average wind speed in May: 7.9mph
The windiest month (with the highest average wind speed) is February (9.7mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in May
Preston, MD
- Average humidity in May: 79%
The months with the highest relative humidity are May, August and September (79%).
The months with the lowest relative humidity are January, March and November (74%).
Average rainfall in May
Preston, MD
- Average rainfall in May: 1.34"
The wettest months (with the highest rainfall) are July and August (2.01").
The driest months (with the least rainfall) are January and September (0.94").
Average rainfall days in May
Preston, MD
- Average rainfall days in May: 14.5 days
The month with the highest number of rainy days is July (16.1 days).
The month with the least rainy days is November (7.2 days).
Average snowfall in May
Preston, MD
- Average snowfall in May: 0.16"
The month with the highest snowfall is January (1.02").
The months with the least snowfall are April, June, July, August, September and October (0").
Average snowfall days in May
Preston, MD
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is January (3 days).
The months with the least snowfall days are April, June, July, August, September and October (0 days).
Average daylight in May /
Average sunshine in May
Preston, MD
- Average daylight in May: 14h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in May: 9h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).
Average sunshine days in May
Preston, MD
- Average sunshine days in May: 13.8 days
The month with the most sunshine days is November (21 days).
The month with the least sunshine days is July (11.5 days).
Average UV index in May
Preston, MD
- 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, November and December (UV index 2).
Average cloud cover in May
Preston, MD
- Average cloud cover in May: 40
The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in May
Preston, MD
- Average visibility in May: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Preston, Maryland, USA
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