May weather forecastNiwot, CO
May
Weather in May
The last month of the spring, May, is a refreshing month in Niwot, Colorado, with temperature in the range of an average low of 42.6°F (5.9°C) and an average high of 66.4°F (19.1°C).Temperature
The start of May brings a subtle shift in the average high-temperature, edging up from April's mild 57.7°F (14.3°C) to a comfortable 66.4°F (19.1°C). Niwot logs a substantial downturn to a cold 42.6°F (5.9°C) during May nights, a considerable shift from daytime highs.Humidity
In Niwot, Colorado, the average relative humidity in May is 54%.Rainfall
The month with the most rainfall is May, when the rain falls for 15 days and typically aggregates up to 1.69" (43mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. May is the last month it regularly snows. During 1.3 snowfall days, in May, Niwot aggregates 1.42" (36mm) of snow. Throughout the year, in Niwot, there are 37.1 snowfall days, and 26.73" (679mm) of snow is accumulated.Daylight
The average length of the day in May in Niwot is 14h and 25min.On the first day of May, sunrise is at 5:59 am and sunset at 7:56 pm. On the last day of the month, sunrise is at 5:33 am and sunset at 8:23 pm MDT.
Sunshine
In Niwot, the average sunshine in May is 11h.UV index
In May, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the average person.Note: In May, a daily maximum UV index of 5 leads to the following instructions:
Exercise prevention - Warding off sunburn is urged. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. 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
Niwot, 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
Niwot, 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
Niwot, 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
Niwot, 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
Niwot, 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
Niwot, 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
Niwot, 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
Niwot, 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
Niwot, 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
Niwot, 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
Niwot, 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
Niwot, 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
Niwot, 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).
