May weather forecastPrinceton, NJ
May
Weather in May
May sees a significant soar in temperature, heralding the onset of summer in Princeton. While the rainfall slightly increases from previous months, totaling 1.22" (31mm). The rising mercury and amplifying sunlight duration attune to the summer rhythm. It showcases a firmly controlled weather pattern, less volatile than the transitional April or spring's remaining. May, in comparison to April, experiences a sharp rise in temperature, marks the cessation of snowfall, and enhances daylight duration.Temperature
As May arrives, Princeton's weather shows an increase in high-temperatures, moving from April's mild 60.4°F (15.8°C) to an agreeable 70.5°F (21.4°C). Throughout May, an average nighttime temperature of 53.2°F (11.8°C) is experienced.Humidity
In May, the average relative humidity is 78%.Rainfall
In Princeton, in May, during 12.6 rainfall days, 1.22" (31mm) of precipitation is typically accumulated. In Princeton, during the entire year, the rain falls for 119.3 days and collects up to 12.72" (323mm) of precipitation.Snowfall
Months with snowfall are January through May, November and December. May is the last month it regularly snows. During 0.1 snowfall days, in May, Princeton aggregates 0.2" (5mm) of snow. Throughout the year, there are 16.4 snowfall days, and 4.41" (112mm) of snow is accumulated.Daylight
In Princeton, the average length of the day in May is 14h and 26min.On the first day of the month, sunrise is at 5:56 am and sunset at 7:54 pm. On the last day of May, sunrise is at 5:30 am and sunset at 8:22 pm EDT.
Sunshine
In Princeton, the average sunshine in May is 8.6h.UV index
In Princeton, the average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 5 during May translates into the following guidance:
Exercise care. People with light skin might get burns in fewer than 30 minutes. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Princeton, NJ
- Average high temperature in May: 70.5°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (36.9°F).
- Average low temperature in May: 53.2°F
The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure in May
Princeton, NJ
- Average pressure in May: 30.01"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in May
Princeton, NJ
- Average wind speed in May: 6.9mph
The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).
Average humidity in May
Princeton, NJ
- Average humidity in May: 78%
The month with the highest relative humidity is October (79%).
The month with the lowest relative humidity is April (73%).
Average rainfall in May
Princeton, NJ
- Average rainfall in May: 1.22"
The wettest month (with the highest rainfall) is July (1.69").
The driest month (with the least rainfall) is September (0.67").
Average rainfall days in May
Princeton, NJ
- Average rainfall days in May: 12.6 days
The month with the highest number of rainy days is July (13.9 days).
The month with the least rainy days is January (6.1 days).
Average snowfall in May
Princeton, NJ
- Average snowfall in May: 0.2"
The month with the highest snowfall is March (1.42").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in May
Princeton, NJ
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is January (4.6 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in May /
Average sunshine in May
Princeton, NJ
- 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 36min
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 48min).
Average sunshine days in May
Princeton, NJ
- Average sunshine days in May: 15 days
The month with the most sunshine days is January (21.8 days).
The month with the least sunshine days is July (13.3 days).
Average UV index in May
Princeton, NJ
- Average UV index in May: 5
The months with the highest UV index are 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
Princeton, NJ
- Average cloud cover in May: 46
The months with the most cloud cover are February, March and December (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 33).
Average visibility in May
Princeton, NJ
- Average visibility in May: 5mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
