Average Weather On April 22 For Boulder, Colorado, USA

Location

This report describes the typical weather at the Boulder Municipal Airport (Boulder, Colorado, United States) weather station over the course of an average April 22. It is based on the historical records from 2010 to 2013. Earlier records are either unavailable or unreliable.

Boulder, Colorado has a humid continental climate with warm summers and no dry season. The area within 25 mi of this station is covered by grasslands (40%), forests (32%), shrublands (18%), built-up areas (8%), and croplands (3%).

Temperature

The temperature typically varies from 43°F to 61°F and is rarely below 38°F or above 69°F.

Temperature

Average hourly temperature (black) with percentil bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

The coolest hours of the day are from 2am to 8am with the coldest at 5am, at which time the temperature is below 47°F three days out of four.

The warmest hours of the day are from noon to 7pm with the hottest at 4pm, at which time the temperature is above 55°F three days out of four.

The day has gained half its heat by 10am and lost it again by 10pm.

Temperature Bands

The average fraction of time spent in various temperature bands: frigid (below 15°F), freezing (15°F to 32°F), cold (32°F to 50°F), cool (50°F to 65°F), comfortable (65°F to 75°F), warm (75°F to 85°F), hot (85°F to 100°F) and sweltering (above 100°F).

Sun

On April 22 the Sun rises at 6:12am and sets at 7:47pm.

Solar noon is at 12:59pm.

For reference, on the longest day of the year the Sun rises at 5:32am and sets at 8:32pm, while on the shortest day of the year it rises at 7:19am and sets at 4:39pm.

Astronomical twilight begins and ends 99 minutes before sunrise and after sunset at 4:33am and 9:26pm, respectively.

Nautical twilight begins and ends 63 minutes before sunrise and after sunset at 5:09am and 8:50pm, respectively.

Civil twilight begins and ends 29 minutes before sunrise and after sunset at 5:43am and 8:15pm, respectively.

Solar twilight begins and ends 36 minutes after sunrise and before sunset at 6:49am and 7:10pm, respectively.

Solar Elevation

Elevation of the Sun above (positive) or below (negative) the horizon (black line). Yellow and gray fills indicate day and night, respectively. Light gray lines are the corresponding curves for the winter and summer equinoxes.

Clouds

The median cloud cover is 28% (mostly clear) and does not vary substantially over the course of the day.

On average, the sky is clear or mostly clear 61% of the time, partly cloudy 10% of the time, and mostly cloudy or overcast 29% of the time.

Median Cloud Cover

Median hourly cloud coverage fraction (black line) with percentile bands (inner band from 40th to 60th percentile, outer band from 25th to 75th percentile).

Cloud Cover Types

The fraction of time spent in each of the five sky cover categories. From top (most blue) to bottom (most gray), the categories are clear, mostly clear, partly cloudy, mostly cloudy, and overcast. Pink indicates missing data. Outside the United States clear skies are often reported ambiguously, leading them to be lumped in with the missing data.

Precipitation

There is either very little precipitation at this location on April 22, or the weather station does not reliably report the conditions.

Snow

Either snow is exceptionally unlikely to fall at this location on April 22 or this station does not reliably report precipitation types.

Humidity

The relative humidity typically ranges from 32% (comfortable) to 61% (mildly humid), rarely dropping below 19% (dry), or exceeding 76% (humid).

The air is driest at 4pm, at which time the relative humidity is less than 40% (comfortable) three days out of four; it is most humid at 5am, exceeding 52% (mildly humid) three days out of four.

Relative Humidity

Average hourly humidity (black line) with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).

Dew Point

The dew point ranges from 25°F to 30°F with an average of 28°F.

For reference, comfortable indoor conditions should have a relative humidity between 30% and 50% with a dew point of less than 65°F.

Dew Point

Average hourly dew point (black line) with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).

Wind

Sustained wind speeds typically vary from 3 mph to 10 mph (light air to gentle breeze) over the course of the day.

The peak sustained wind speed typically occurs around 4pm and is rarely outside the range 5 mph to 15 mph (light breeze to moderate breeze).

The wind is most calm around 5am, rarely exceeding 6 mph (light breeze).

Wind Speed

Average hourly wind speed (black line) with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).

The wind is most often out of the west (17% of the time), north (15% of the time), south west (12% of the time), east (12% of the time), and north east (11% of the time).

Wind Directions

The fraction of time spent with the wind blowing from the various directions over the entire day. Values do not sum to 100% because the wind direction is undefined when the wind speed is zero.

Wind Directions Over Day

The fraction of time spent with the wind blowing from the various directions on an hourly basis. Values do not sum to 100% because the wind direction is undefined when the wind speed is zero.