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 17. 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 37°F to 46°F and is rarely below 26°F or above 59°F.
The coolest hours of the day are from 2am to 9am with the coldest at 7am, at which time the temperature is below 44°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 39°F three days out of four.
The day has gained half its heat by 10am and lost it again by 9pm.
On November 17 the Sun rises at 6:43am and sets at 4:28pm.
Solar noon is at 11:35am.
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 97 minutes before sunrise and after sunset at 5:06am and 6:05pm, respectively.
Nautical twilight begins and ends 63 minutes before sunrise and after sunset at 5:39am and 5:31pm, respectively.
Civil twilight begins and ends 30 minutes before sunrise and after sunset at 6:13am and 4:58pm, respectively.
Solar twilight begins and ends 42 minutes after sunrise and before sunset at 7:25am and 3:46pm, respectively.
The median cloud cover is 91% (mostly cloudy) and does not vary substantially over the course of the day.
On average, the sky is clear or mostly clear 24% of the time, partly cloudy 12% of the time, and mostly cloudy or overcast 64% of the time.
There is a 48% chance that precipitation will be observed at some point during the day.
The average measured liquid-equivalent quantity of precipitation is 0.081". Among only those days for which there is at least some measured precipitation, the average is 0.263" and the total rarely exceeds 0.615".
When precipitation does occur it is most often in the form of slight rain (36% of days with precipitation have at worst slight rain), slight snow (26%), moderate rain (10%), drizzle (8%), thunderstorms (8%), and moderate snow (7%).
Precipitation is most likely around 10pm and least likely around noon.
Either snow is exceptionally unlikely to fall at this location on November 17 or this station does not reliably report precipitation types.
The relative humidity typically ranges from 63% (mildly humid) to 77% (humid), rarely dropping below 42% (comfortable), or exceeding 94% (very humid).
The air is driest at 2pm, at which time the relative humidity is less than 75% (humid) three days out of four; it is most humid at 5am, exceeding 69% (mildly humid) three days out of four.
The dew point ranges from 30°F to 32°F with an average of 31°F.
For reference, comfortable indoor conditions should have a relative humidity between 30% and 50% with a dew point of less than 65°F.
The wind speed is 11 mph (gentle breeze) on average and is rarely outside the range 5 mph to 17 mph (light breeze to moderate breeze). The wind speed does not vary substantially during the course of the day.
The wind is most often out of the south (21% of the time), west (20% 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) and east (5% of the time).