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 indicates a change in the average high-temperature, moving up from a frosty 49.6°F (9.8°C) in April to a mild 60.6°F (15.9°C). May nights are marked by an average temperature drop to a frosty 48.7°F (9.3°C).Humidity
The average relative humidity in May is 80%.Rainfall
In Alton, in May, during 16.7 rainfall days, 3.46" (88mm) of precipitation is typically accumulated. Throughout the year, there are 171.8 rainfall days, and 32.76" (832mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. May is the last month it regularly snows. During 0.5 snowfall days, in May, Alton aggregates 0.28" (7mm) of snow. In Alton, during the entire year, snow falls for 67.1 days and aggregates up to 22.99" (584mm) of snow.Daylight
In May, the average length of the day is 14h and 42min.On the first day of the month, sunrise is at 6:00 am and sunset at 8:09 pm. On the last day of May, sunrise is at 5:30 am and sunset at 8:40 pm EDT.
Sunshine
The average sunshine in May is 9.4h.UV index
The average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: In May, a daily UV index of 4 turns into the following recommendations:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused 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 average humidity in May?
How much does it rain in May?
What is the last month it snows?
What is the average length of the day in May?
What time are sunrise and sunset in May?
How long on average sun shines in May?
What is the UV index reading in May?
Average temperature in May
Alton, NY
- Average high temperature in May: 60.6°F
The warmest month (with the highest average high temperature) is July (76.5°F).
The month with the lowest average high temperature is January (29.7°F).
- Average low temperature in May: 48.7°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (21°F).
Average pressure in May
Alton, NY
- Average pressure in May: 29.98"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in May
Alton, NY
- Average wind speed in May: 8.8mph
The windiest month (with the highest average wind speed) is January (13.1mph).
The calmest month (with the lowest average wind speed) is July (7.5mph).
Average humidity in May
Alton, NY
- Average humidity in May: 80%
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is September (76%).
Average rainfall in May
Alton, NY
- Average rainfall in May: 3.46"
The wettest month (with the highest rainfall) is October (3.62").
The driest month (with the least rainfall) is January (2.05").
Average rainfall days in May
Alton, NY
- Average rainfall days in May: 16.7 days
The month with the highest number of rainy days is July (18.1 days).
The month with the least rainy days is February (7.9 days).
Average snowfall in May
Alton, NY
- Average snowfall in May: 0.28"
The month with the highest snowfall is February (6.26").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Alton, NY
- Average snowfall days in May: 0.5 days
The month with the highest number of snowfall days is January (16.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Alton, NY
- Average daylight in May: 14h and 4min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in May: 9h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is January (Average sunshine: 2h and 36min).
Average sunshine days in May
Alton, NY
- Average sunshine days in May: 12.7 days
The month with the most sunshine days is May (12.7 days).
The month with the least sunshine days is February (6.3 days).
Average UV index in May
Alton, NY
- Average UV index in May: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in May
Alton, NY
- Average cloud cover in May: 38
The month with the most cloud cover is January (Cloud cover 75).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility in May
Alton, NY
- Average visibility in May: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
Alton, New York, USA
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