May weather forecastKeystone, NE
May
Weather in May
May, the last month of the spring in Keystone, is a pleasant month, with an average temperature varying between 48.7°F (9.3°C) and 68.4°F (20.2°C).Temperature
In Keystone, the average high-temperature in May slightly rises, from a moderate 59.5°F (15.3°C) in April, to a pleasant 68.4°F (20.2°C). During the month of May, an average low-temperature of 48.7°F (9.3°C) is recorded.Humidity
In Keystone, the average relative humidity in May is 61%.Rainfall
May is the month with the most rainfall. Rain falls for 17 days and accumulates 3.39" (86mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. May is the last month it regularly snows. During 0.6 snowfall days, in May, Keystone aggregates 0.43" (11mm) of snow. Throughout the year, there are 35 snowfall days, and 14.65" (372mm) of snow is accumulated.Daylight
In May, the average length of the day is 14h and 31min.On the first day of the month, sunrise is at 5:42 am and sunset at 7:44 pm. On the last day of May, sunrise is at 5:15 am and sunset at 8:12 pm MDT.
Sunshine
In May, the average sunshine is 9.8h.UV index
The average daily maximum UV index in May is 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: In May, the average maximum UV index of 5 translates into the following recommendations:
Undertake precautions - Obligation exists to protect against skin and eye damage. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Keystone, NE
- Average high temperature in May: 68.4°F
The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is December (37.4°F).
- Average low temperature in May: 48.7°F
The month with the highest average low temperature is July (65.8°F).
The coldest months (with the lowest average low temperature) are January and December (22.3°F).
Average pressure in May
Keystone, NE
- Average pressure in May: 29.89"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).
Average wind speed in May
Keystone, NE
- Average wind speed in May: 11.4mph
The windiest month (with the highest average wind speed) is April (12.6mph).
The calmest month (with the lowest average wind speed) is August (9.6mph).
Average humidity in May
Keystone, NE
- Average humidity in May: 61%
The month with the highest relative humidity is January (70%).
The month with the lowest relative humidity is September (53%).
Average rainfall in May
Keystone, NE
- Average rainfall in May: 3.39"
The wettest month (with the highest rainfall) is May (3.39").
The driest month (with the least rainfall) is January (0.39").
Average rainfall days in May
Keystone, NE
- Average rainfall days in May: 17 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is December (3.8 days).
Average snowfall in May
Keystone, NE
- Average snowfall in May: 0.43"
The month with the highest snowfall is February (3.23").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Keystone, NE
- Average snowfall days in May: 0.6 days
The month with the highest number of snowfall days is February (8.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Keystone, NE
- Average daylight in May: 14h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in May: 9h and 48min
The months with the most sunshine are July and August (Average sunshine: 11h and 24min).
The month with the least sunshine is February (Average sunshine: 6h and 0min).
Average sunshine days in May
Keystone, NE
- Average sunshine days in May: 10.6 days
The month with the most sunshine days is November (22.7 days).
The months with the least sunshine days are May and June (10.6 days).
Average UV index in May
Keystone, NE
- Average UV index in May: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Keystone, NE
- Average cloud cover in May: 33
The month with the most cloud cover is February (Cloud cover 36).
The months with the least cloud cover are July, August and September (Cloud cover 20).
Average visibility in May
Keystone, NE
- 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).
