May weather forecastDerby, NY
May
Weather in May
May, the last month of the spring in Derby, is an enjoyable month, with an average temperature varying between 47.7°F (8.7°C) and 64.2°F (17.9°C).Temperature
The start of May signals an increase in the average high-temperature, moving from a cool 51.4°F (10.8°C) in April to a refreshing 64.2°F (17.9°C). An average minimum temperature of 47.7°F (8.7°C) is recorded during the month of May.Humidity
In May, the average relative humidity is 79%.Rainfall
In Derby, in May, during 16.4 rainfall days, 2.48" (63mm) of precipitation is typically accumulated. Throughout the year, there are 160.5 rainfall days, and 24.17" (614mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. May is the last month it regularly snows. During 0.4 snowfall days, in May, Derby aggregates 0.2" (5mm) of snow. In Derby, during the entire year, snow falls for 62.9 days and aggregates up to 19.65" (499mm) of snow.Daylight
In Derby, the average length of the day in May is 14h and 39min.On the first day of the month, sunrise is at 6:09 am and sunset at 8:16 pm. On the last day of May, sunrise is at 5:40 am and sunset at 8:46 pm EDT.
Sunshine
In May, the average sunshine in Derby is 8.9h.UV index
The average daily maximum UV index in May is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: The daily high UV index of 5 during May translates into the following recommendations:
Exercise prevention - Precautions against solar damage are endorsed. Avoiding the Sun during its peak radiation time around midday is a healthy practice. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Derby, NY
- Average high temperature in May: 64.2°F
The warmest month (with the highest average high temperature) is July (77.2°F).
The month with the lowest average high temperature is January (28.8°F).
- Average low temperature in May: 47.7°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in May
Derby, NY
- Average pressure in May: 29.99"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in May
Derby, NY
- Average wind speed in May: 8.1mph
The windiest month (with the highest average wind speed) is January (11.8mph).
The calmest month (with the lowest average wind speed) is July (6.9mph).
Average humidity in May
Derby, NY
- Average humidity in May: 79%
The month with the highest relative humidity is February (87%).
The months with the lowest relative humidity are August and September (78%).
Average rainfall in May
Derby, NY
- Average rainfall in May: 2.48"
The wettest month (with the highest rainfall) is July (2.52").
The driest month (with the least rainfall) is January (1.54").
Average rainfall days in May
Derby, NY
- Average rainfall days in May: 16.4 days
The months with the highest number of rainy days are July and October (18.1 days).
The month with the least rainy days is February (7 days).
Average snowfall in May
Derby, NY
- Average snowfall in May: 0.2"
The month with the highest snowfall is February (5.43").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Derby, NY
- Average snowfall days in May: 0.4 days
The month with the highest number of snowfall days is January (15.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Derby, NY
- Average daylight in May: 14h and 36min
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 6min).
- Average sunshine in May: 8h and 54min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 2h and 24min).
Average sunshine days in May
Derby, NY
- Average sunshine days in May: 12.6 days
The month with the most sunshine days is March (13 days).
The month with the least sunshine days is January (8.3 days).
Average UV index in May
Derby, NY
- Average UV index in May: 5
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
Derby, NY
- Average cloud cover in May: 42
The month with the most cloud cover is January (Cloud cover 76).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in May
Derby, NY
- Average visibility in May: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
