Contents
- Weather in April
- Frequently asked questions
- Average temperature in April
- Average pressure in April
- Average wind speed in April
- Average humidity in April
- Average rainfall in April
- Average rainfall days in April
- Average snowfall in April
- Average snowfall days in April
- Average daylight in April
- Average sunshine in April
- Average sunshine days in April
- Average UV index in April
- Average cloud cover in April
- Average visibility in April
Weather in April
Temperature
With the onset of April, Boulder's average high-temperature sees a modest rise, moving from March's chilly 46.4°F (8°C) to a fresh 52.3°F (11.3°C). Boulder reports a considerable drop from daytime temperatures in April, recording an average nighttime figure of 30.7°F (-0.7°C).Humidity
In April, the average relative humidity is 58%.Rainfall
In April, the rain falls for 12.3 days. Throughout April, 1.65" (42mm) of precipitation is accumulated. In Boulder, Colorado, during the entire year, the rain falls for 117.3 days and collects up to 14.17" (360mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. April is the month with the most snowfall. Snow falls for 4.9 days and accumulates 7.76" (197mm) of snow.Daylight
In Boulder, Colorado, the average length of the day in April is 13h and 18min.On the first day of April, sunrise is at 6:43 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:01 am and sunset at 7:55 pm MDT.
Sunshine
The average sunshine in April is 10.3h.UV index
In Boulder, the average daily maximum UV index in April is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A maximum UV index of 3 in April translates into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Enhance your sun protection with tightly woven, yet airy clothing. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average April temperature?
What is the average humidity in April?
How many days does it rain in April?
When does it snow the most in Boulder?
How many days does it snow in April?
What is the average length of the day in April?
What time are sunrise and sunset in April?
How many hours of sunshine does Boulder have in April?
What is the UV index intensity in April?
Average temperature in April
Boulder, CO
- Average high temperature in April: 52.3°F
The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is December (35.2°F).
- Average low temperature in April: 30.7°F
The month with the highest average low temperature is July (55.2°F).
The coldest month (with the lowest average low temperature) is February (18°F).
Average pressure in April
Boulder, CO
- Average pressure in April: 29.92"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The months with the lowest atmospheric pressure are April, May and June (29.92"Hg).
Average wind speed in April
Boulder, CO
- Average wind speed in April: 6.6mph
The windiest month (with the highest average wind speed) is January (7.3mph).
The calmest months (with the lowest average wind speed) are May, July, August and September (5.7mph).
Average humidity in April
Boulder, CO
- Average humidity in April: 58%
The month with the highest relative humidity is February (70%).
The months with the lowest relative humidity are June, August and September (45%).
Average rainfall in April
Boulder, CO
- Average rainfall in April: 1.65"
The wettest month (with the highest rainfall) is May (2.48").
The driest month (with the least rainfall) is January (0.39").
Average rainfall days in April
Boulder, CO
- Average rainfall days in April: 12.3 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is November (3.3 days).
Average snowfall in April
Boulder, CO
- Average snowfall in April: 7.76"
The month with the highest snowfall is April (7.76").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in April
Boulder, CO
- Average snowfall days in April: 4.9 days
The month with the highest number of snowfall days is February (10.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in April /
Average sunshine in April
Boulder, CO
- Average daylight in April: 13h and 2min
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 April: 10h and 2min
The months with the most sunshine are June and July (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 6h and 36min).
Average sunshine days in April
Boulder, CO
- Average sunshine days in April: 13.2 days
The month with the most sunshine days is January (22.2 days).
The month with the least sunshine days is July (9.9 days).
Average UV index in April
Boulder, CO
- Average UV index in April: 3
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in April
Boulder, CO
- Average cloud cover in April: 28
The months with the most cloud cover are April and May (Cloud cover 28).
The month with the least cloud cover is September (Cloud cover 16).
Average visibility in April
Boulder, CO
- Average visibility in April: 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).
Boulder, Colorado, USA
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