May weather forecastLongmont, CO
May
Weather in May
May is a clear departure from the cooling confines of winter and an open invitation to pleasant spring weather in Longmont. This month experiences the highest recorded rainfall of the year, accumulating to 1.69" (43mm) spread over an average of 15 days. Blossoms achieve full bloom, and migrating birds return, making it a popular choice for outdoor activities and reconnecting with nature. With longer daylight hours, Longmont highlights the vitality of the locale, embracing the dynamic environment of the spring season.Temperature
Longmont's May weather indicates a minor ascent in high-temperatures, adjusting from a mild 57.7°F (14.3°C) in April to a comfortable 66.4°F (19.1°C). Longmont, amid May nights, sees a noteworthy disparity from daily highs with an average temperature of 42.6°F (5.9°C).Humidity
In May, the average relative humidity in Longmont, Colorado, is 54%.Rainfall
May is the month with the most rainfall. Rain falls for 15 days and accumulates 1.69" (43mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. May is the last month it regularly snows. During 1.3 snowfall days, in May, Longmont aggregates 1.42" (36mm) of snow. Throughout the year, there are 37.1 snowfall days, and 26.73" (679mm) of snow is accumulated.Daylight
In May, the average length of the day in Longmont is 14h and 25min.On the first day of the month, sunrise is at 5:58 am and sunset at 7:55 pm. On the last day of May, sunrise is at 5:33 am and sunset at 8:23 pm MDT.
Sunshine
In Longmont, Colorado, the average sunshine in May is 11h.UV index
The average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: In May, a regular UV index of 5 translates into these guidelines:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Longmont, CO
- Average high temperature in May: 66.4°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is December (39°F).
- Average low temperature in May: 42.6°F
The month with the highest average low temperature is July (59.2°F).
The coldest month (with the lowest average low temperature) is December (19.9°F).
Average pressure in May
Longmont, CO
- Average pressure in May: 29.92"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The months with the lowest atmospheric pressure are April and June (29.91"Hg).
Average wind speed in May
Longmont, CO
- Average wind speed in May: 5.9mph
The windiest months (with the highest average wind speed) are March and April (6.6mph).
The calmest months (with the lowest average wind speed) are August and September (5.6mph).
Average humidity in May
Longmont, CO
- Average humidity in May: 54%
The month with the highest relative humidity is February (66%).
The month with the lowest relative humidity is August (42%).
Average rainfall in May
Longmont, CO
- Average rainfall in May: 1.69"
The wettest month (with the highest rainfall) is May (1.69").
The driest month (with the least rainfall) is January (0.35").
Average rainfall days in May
Longmont, CO
- Average rainfall days in May: 15 days
The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is January (3.5 days).
Average snowfall in May
Longmont, CO
- Average snowfall in May: 1.42"
The month with the highest snowfall is November (4.41").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Longmont, CO
- Average snowfall days in May: 1.3 days
The month with the highest number of snowfall days is February (7.7 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in May /
Average sunshine in May
Longmont, CO
- 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: 11h and 0min
The month with the most sunshine is June (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 48min).
Average sunshine days in May
Longmont, CO
- Average sunshine days in May: 13 days
The month with the most sunshine days is January (23.4 days).
The month with the least sunshine days is July (9.3 days).
Average UV index in May
Longmont, CO
- Average UV index in May: 5
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Longmont, CO
- Average cloud cover in May: 26
The months with the most cloud cover are April and May (Cloud cover 26).
The months with the least cloud cover are June and September (Cloud cover 16).
Average visibility in May
Longmont, CO
- 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).
