Current data Radar/satellite images Forecast
University of Chicago weather
Ryerson Observatory
1100 E. 58th St., Chicago, IL 60637 : 41.8 N - 87.6 W - 690 ft
07/23/08 21:49:10
Sunrise: 05:37 - Sunset: 20:18 - Moon: Waning 71% Full
Click images for past data
Temperature
degC heat-index low high 		Wind
(km/hr) (mi/hr) high 		Humidity
low high
Today's rain/hr Today's barometric pressure
Today's solar radiation Today's ultraviolet radiation
Current radiation in the basement of the Regenstein Library: 10 μR/hr (info)
Temperature: 69.6 F
Wind Chill: 69.6 F
Heat Index: 69.6 F
Dewpoint: 57.7 F
Humidity: 66 %
Barometer: 30.119  in +
Wind: N  at   2  mph
High Wind: 25 mph at 11:07
Recent Avg Wind: 2 mph
Recent Beaufort Scale: Light Air
Today's Rain: 0.00  in
Rain Rate: 0.00  in/hr
High Rain Rate: 0.00 in/hr at -----
Storm Total: 0.00  in
Monthly Rain: 4.84  in
Yearly Rain (JAN): 13.66  in
Air Density: 1.201  kg/m^3
Est. Cumulus Base: 2707  ft
High Temperature: 74.2 F at 15:31
Low Temperature: 63.4 F at 05:44
High Heat Index: 74.2 F at 15:31
Low Wind Chill: 63.4 F at 05:44
High Humidity: 87 % at 05:33
Low Humidity: 54 % at 15:31
High Dewpoint: 60.8 F at 00:00
Low Dewpoint: 55.2 F at 13:37
High Barometer: 30.166 in at 11:58
Low Barometer: 30.087 in at 01:25
Current conditions Almanac Last 24 hours Last 7 days Last 28 days Archives
radar (precipitation) satellite (clouds) midway webcam
radar loop
(click to enlarge) 		satellite loop
(click to enlarge) 		midway
(click to enlarge)
National Weather Service forecast for Chicago: Last Update: 323 PM CDT WED JUL 23 2008
Tonight...Clear. Lows in the upper 50s...except in the lower 60s downtown. Northeast winds around 10 mph early in the evening becoming light and variable.

Thursday...Partly cloudy. Highs around 80. Light and variable winds in the morning becoming south around 10 mph in the afternoon.

Thursday Night...Mostly cloudy with a 30 percent chance of showers and thunderstorms. Lows in the mid 60s. South winds around 10 mph in the evening becoming light and variable.

Friday...Partly sunny with a 30 percent chance of showers and thunderstorms. Highs in the mid 80s. South winds around 10 mph.

Friday Night...Partly cloudy with a 20 percent chance of showers and thunderstorms. Lows in the mid 60s...except in the upper 60s downtown. South winds around 10 mph.

Saturday...Partly cloudy in the morning then becoming mostly sunny. Highs in the lower 80s.

Saturday Night...Mostly clear. Lows in the mid 60s.

Sunday...Mostly sunny. Highs in the upper 70s.

Sunday Night Through Wednesday...Mostly clear. Lows in the lower to mid 60s. Highs in the lower 80s...except a little cooler near the lake.

Hazardous Weather Outlook

Graphical hourly forecast (NWS):
NOAA graphical forecast

Chicago clear sky clock

Weather station and web page maintained by the Ryerson Astronomical Society at the University of Chicago. Send questions and comments to Joseph Cottral (current RAS president).

Local weather data collected using a Vantage Pro2 weather station from Davis Instruments. Thanks to the SGFC for providing funding to purchase this station.

Radar maps and forecasts are from the National Weather Service. Satellite images are from the Space Science and Engineering Center at UW-Madison. Clear sky clocks are from ClearDarkSky, using data from the Canadian Meteorological Center. Midway webcam images are from NSIT.

This site uses wview 3.8.0 VantagePro.
The wview daemon has been running for 0 years, 0 months, 6 days, 10 hours, 51 minutes, 58 seconds.

102 separate visits (50 unique IPs) since 07:35

SI/metric units: we're working on it.

No graphics? ASCII-only page!