This report describes the typical weather at the Chippewa Valley Regional Airport (Eau Claire, Wisconsin, United States) weather station over the course of an average year. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Eau Claire, Wisconsin has a humid continental climate with hot summers and no dry season. The area within 25 mi of this station is covered by grasslands (84%) and croplands (13%).
Over the course of a year, the temperature typically varies from 5°F to 83°F and is rarely below -15°F or above 91°F.
The warm season lasts from May 19 to September 16 with an average daily high temperature above 70°F. The hottest day of the year is July 23, with an average high of 83°F and low of 62°F.
The cold season lasts from November 27 to March 2 with an average daily high temperature below 34°F. The coldest day of the year is January 17, with an average low of 5°F and high of 22°F.
The length of the day varies significantly over the course of the year. The shortest day is December 21 with 8:46 hours of daylight; the longest day is June 20 with 15:37 hours of daylight.
The earliest sunrise is at 5:19am on June 17 and the latest sunset is at 8:57pm on June 24. The latest sunrise is at 7:47am on November 3 and the earliest sunset is at 4:24pm on December 9.
Daylight savings time (DST) is observed in this location during 2012, starting in the spring on March 11 and ending in the fall on November 4.
The median cloud cover ranges from 44% (partly cloudy) to 92% (mostly cloudy). The sky is cloudiest on December 3 and clearest on July 19. The clearer part of the year begins around May 1. The cloudier part of the year begins around October 14.
On July 19, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 64% of the time, and overcast or mostly cloudy 36% of the time.
On December 3, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 66% of the time, and clear or mostly clear 34% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around December 31, occurring in 60% of days. Precipitation is least likely around October 9, occurring in 47% of days.
Over the entire year, the most common forms of precipitation are light snow, light rain, and thunderstorms.
Light snow is the most severe precipitation observed during 33% of those days with precipitation. It is most likely around January 3, when it is observed during 47% of all days.
Light rain is the most severe precipitation observed during 24% of those days with precipitation. It is most likely around May 17, when it is observed during 23% of all days.
Thunderstorms are the most severe precipitation observed during 23% of those days with precipitation. They are most likely around July 5, when it is observed during 30% of all days.
During the warm season, which lasts from May 19 to September 16, there is a 50% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of thunderstorms (50% of days with precipitation have at worst thunderstorms), light rain (33%), and moderate rain (11%).
During the cold season, which lasts from November 27 to March 2, there is a 56% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of light snow (75% of days with precipitation have at worst light snow) and moderate snow (8%).
The likelihood of snow falling is highest around December 31, occurring in 54% of days. The season in which it is relatively likely for snow to fall spans from October 30 to April 10.
Either snow rarely accumulates at this location or snow depth measurements are unavailable or unreliable.
The relative humidity typically ranges from 36% (comfortable) to 93% (very humid) over the course of the year, rarely dropping below 20% (dry) and reaching as high as 100% (very humid).
The air is driest around April 26, at which time the relative humidity drops below 44% (comfortable) three days out of four; it is most humid around August 19, exceeding 91% (very humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a year, the dew point typically varies from -1°F (dry) to 66°F (muggy) and is rarely below -22°F (dry) or above 73°F (very muggy).
There are two periods in the year that are most comfortable: The first is between May 17 and July 12 and the second is between July 30 and September 29. The air feels neither too dry nor too muggy during these periods.
Over the course of the year typical wind speeds vary from 0 mph to 16 mph (calm to moderate breeze), rarely exceeding 23 mph (fresh breeze).
The highest average wind speed of 9 mph (gentle breeze) occurs around April 9, at which time the average daily maximum wind speed is 16 mph (moderate breeze).
The lowest average wind speed of 7 mph (light breeze) occurs around August 5, at which time the average daily maximum wind speed is 13 mph (moderate breeze).