This report describes the typical weather at the Dane County Regional Airport (Madison, Wisconsin, United States) weather station over the course of an average March 20. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Madison, 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 (49%), croplands (45%), and lakes and rivers (3%).
The temperature typically varies from 30Â°F to 44Â°F and is rarely below 17Â°F or above 59Â°F.
The coolest hours of the day are from 1am to 8am with the coldest at 6am, at which time the temperature is below 36Â°F three days out of four.
The warmest hours of the day are from noon to 6pm with the hottest at 3pm, at which time the temperature is above 36Â°F three days out of four.
The day has gained half its heat by 10am and lost it again by 9pm.
On March 20 the Sun rises at 6:59am and sets at 7:10pm.
Solar noon is at 1:04pm.
For reference, on the longest day of the year the Sun rises at 5:17am and sets at 8:40pm, while on the shortest day of the year it rises at 7:25am and sets at 4:25pm.
Astronomical twilight begins and ends 95 minutes before sunrise and after sunset at 5:24am and 8:45pm, respectively.
Nautical twilight begins and ends 61 minutes before sunrise and after sunset at 5:58am and 8:12pm, respectively.
Civil twilight begins and ends 28 minutes before sunrise and after sunset at 6:31am and 7:38pm, respectively.
Solar twilight begins and ends 37 minutes after sunrise and before sunset at 7:37am and 6:32pm, respectively.
The median cloud cover is 78% (partly cloudy) and does not vary substantially over the course of the day.
On average, the sky is clear or mostly clear 38% of the time, partly cloudy 9% of the time, and mostly cloudy or overcast 52% of the time.
There is a 53% chance that precipitation will be observed at some point during the day.
The average measured liquid-equivalent quantity of precipitation is 0.065". Among only those days for which there is at least some measured precipitation, the average is 0.196" and the total rarely exceeds 0.437".
When precipitation does occur it is most often in the form of slight snow (39% of days with precipitation have at worst slight snow), slight rain (20%), moderate rain (12%), thunderstorms (12%), and moderate snow (10%).
Precipitation is observed with more or less equal probability throughout the day.
There is a 29% chance that there will be snow on the ground. The average snow depth is 1.5". The snow depth is deeper than 3.0" one year in four and deeper than 4.7" one year in ten.
The relative humidity typically ranges from 56% (mildly humid) to 80% (humid), rarely dropping below 34% (comfortable), or exceeding 94% (very humid).
The air is driest at 3pm, at which time the relative humidity is less than 69% (mildly humid) three days out of four; it is most humid at 5am, exceeding 72% (humid) three days out of four.
The dew point ranges from 25Â°F to 27Â°F with an average of 27Â°F.
For reference, comfortable indoor conditions should have a relative humidity between 30% and 50% with a dew point of less than 65Â°F.
Sustained wind speeds typically vary from 8 mph to 13 mph (gentle breeze to moderate breeze) over the course of the day.
The peak sustained wind speed typically occurs around 2pm and is rarely outside the range 7 mph to 19 mph (light breeze to fresh breeze).
The wind is most calm around 4am, rarely exceeding 15 mph (moderate breeze).
The wind is most often out of the north west (17% of the time), south (15% of the time), north east (12% of the time), and north (11% of the time).