This report describes the typical weather at the Chicago Midway International Airport (Chicago, Illinois, United States) weather station over the course of an average November 9. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Chicago, Illinois has a humid continental climate with hot summers and no dry season. The area within 25 mi of this station is covered by built-up areas (36%), oceans and seas (24%), grasslands (23%), croplands (14%), and forests (3%).
The temperature typically varies from 41°F to 50°F and is rarely below 29°F or above 64°F.
The coolest hours of the day are from 2am to 9am with the coldest at 7am, at which time the temperature is below 47°F three days out of four.
The warmest hours of the day are from 11am to 5pm with the hottest at 2pm, at which time the temperature is above 43°F three days out of four.
The day has gained half its heat by 10am and lost it again by 9pm.
On November 9 the Sun rises at 6:33am and sets at 4:35pm.
Solar noon is at 11:34am.
For reference, on the longest day of the year the Sun rises at 5:15am and sets at 8:29pm, while on the shortest day of the year it rises at 7:15am and sets at 4:23pm.
Astronomical twilight begins and ends 95 minutes before sunrise and after sunset at 4:58am and 6:11pm, respectively.
Nautical twilight begins and ends 62 minutes before sunrise and after sunset at 5:30am and 5:38pm, respectively.
Civil twilight begins and ends 29 minutes before sunrise and after sunset at 6:04am and 5:05pm, respectively.
Solar twilight begins and ends 40 minutes after sunrise and before sunset at 7:14am and 3:54pm, respectively.
The median cloud cover is 88% (mostly cloudy) and does not vary substantially over the course of the day.
On average, the sky is clear or mostly clear 25% of the time, partly cloudy 13% of the time, and mostly cloudy or overcast 62% of the time.
There is a 46% chance that precipitation will be observed at some point during the day.
The average measured liquid-equivalent quantity of precipitation is 0.084". Among only those days for which there is at least some measured precipitation, the average is 0.301" and the total rarely exceeds 0.703".
When precipitation does occur it is most often in the form of slight rain (40% of days with precipitation have at worst slight rain), slight snow (21%), moderate rain (13%), thunderstorms (9%), drizzle (8%), and moderate snow (6%).
Precipitation is most likely around 10pm and least likely around noon.
Either snow is exceptionally unlikely to fall at this location on November 9 or this station does not reliably report precipitation types.
The relative humidity typically ranges from 61% (mildly humid) to 77% (humid), rarely dropping below 40% (comfortable), or exceeding 94% (very humid).
The air is driest at 2pm, at which time the relative humidity is less than 73% (humid) three days out of four; it is most humid at 5am, exceeding 68% (mildly humid) three days out of four.
The dew point ranges from 33°F to 35°F with an average of 34°F.
For reference, comfortable indoor conditions should have a relative humidity between 30% and 50% with a dew point of less than 65°F.
Sustained wind speeds typically vary from 9 mph to 13 mph (gentle breeze to moderate breeze) over the course of the day.
The peak sustained wind speed typically occurs around 3pm 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 south (22% of the time), west (18% of the time), south west (17% of the time), and north west (12% of the time). The wind is least often out of the south east (4% of the time).