May weather forecastJefferson, CO
May
Weather in May
The last month of the spring, May, is a frosty month in Jefferson, Colorado, with an average temperature ranging between min 23.4°F (-4.8°C) and max 45.5°F (7.5°C).Temperature
Jefferson, Colorado, sees a rise in temperature during May, with average high-temperatures transitioning from a cold 33.6°F (0.9°C) in April to a chilly 45.5°F (7.5°C). Jefferson experiences a significant reduction from daytime highs with an average low-temperature of 23.4°F (-4.8°C) in May.Humidity
In Jefferson, the average relative humidity in May is 71%.Rainfall
In Jefferson, during May, the rain falls for 12.3 days and regularly aggregates up to 3.23" (82mm) of precipitation. In Jefferson, Colorado, during the entire year, the rain falls for 110.4 days and collects up to 24.09" (612mm) of precipitation.Snowfall
Months with snowfall are January through December. The month with the most snowfall is May, when snow falls for 19 days and typically aggregates up to 19.69" (500mm) of snow.Daylight
The average length of the day in May is 14h and 22min.On the first day of May, sunrise is at 6:03 am and sunset at 7:57 pm. On the last day of the month, sunrise is at 5:38 am and sunset at 8:23 pm MDT.
Sunshine
In Jefferson, the average sunshine in May is 9.9h.UV index
The months with the highest UV index are May through August, with an average maximum UV index of 3. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum UV index of 3 during May translates into these guidelines:
Take necessary precautions - Protection from skin and eye injury is mandatory. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Jefferson, CO
- Average high temperature in May: 45.5°F
The warmest month (with the highest average high temperature) is July (65.8°F).
The month with the lowest average high temperature is December (21.2°F).
- Average low temperature in May: 23.4°F
The month with the highest average low temperature is July (40.1°F).
The coldest months (with the lowest average low temperature) are January and December (0.7°F).
Average pressure in May
Jefferson, CO
- Average pressure in May: 29.94"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The months with the lowest atmospheric pressure are April and May (29.94"Hg).
Average wind speed in May
Jefferson, CO
- Average wind speed in May: 6.1mph
The windiest month (with the highest average wind speed) is February (7mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in May
Jefferson, CO
- Average humidity in May: 71%
The month with the highest relative humidity is February (89%).
The month with the lowest relative humidity is June (54%).
Average rainfall in May
Jefferson, CO
- Average rainfall in May: 3.23"
The wettest month (with the highest rainfall) is July (3.35").
The driest month (with the least rainfall) is November (1.14").
Average rainfall days in May
Jefferson, CO
- Average rainfall days in May: 12.3 days
The month with the highest number of rainy days is July (22.8 days).
The month with the least rainy days is November (2.8 days).
Average snowfall in May
Jefferson, CO
- Average snowfall in May: 19.69"
The month with the highest snowfall is May (19.69").
The month with the least snowfall is July (0.24").
Average snowfall days in May
Jefferson, CO
- Average snowfall days in May: 19 days
The month with the highest number of snowfall days is April (22.8 days).
The month with the least snowfall days is July (1.3 days).
Average daylight in May /
Average sunshine in May
Jefferson, CO
- Average daylight in May: 14h and 24min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in May: 9h and 54min
The month with the most sunshine is June (Average sunshine: 11h and 24min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).
Average sunshine days in May
Jefferson, CO
- Average sunshine days in May: 7.5 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is July (5.8 days).
Average UV index in May
Jefferson, CO
- Average UV index in May: 3
The months with the highest UV index are May, June, July and August (UV index 3).
The months with the lowest UV index are February and December (UV index 1).
Average cloud cover in May
Jefferson, CO
- Average cloud cover in May: 36
The month with the most cloud cover is February (Cloud cover 54).
The month with the least cloud cover is June (Cloud cover 19).
Average visibility in May
Jefferson, CO
- Average visibility in May: 5mi
The months with the highest visibility are June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, April and December (4mi).
