Wednesday’s high of 47°F broke the record for the lowest daily high for May 20. The previous record as 51°F (2002).
The cold high was only the sixth time since 1906 that a high temperature hits cold was observed this far into the spring season. The last time it was this cold in May was a 47°F reading on May 28, 1984.
| D a t e |
Time (cst) |
Wind (mph) |
Vis. (mi.) |
Weather | Sky Cond. | Temperature (ºF) | Relative Humidity |
Wind Chill (°F) |
Heat Index (°F) |
Pressure | Precipitation (in.) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air | Dwpt | 6 hour | altimeter (in) |
sea level (mb) |
1 hr | 3 hr | 6 hr | ||||||||||
| Max. | |||||||||||||||||
| 20 | 23:51 | NW 10 | 10.00 | Overcast | OVC050 | 45 | 40 | 83% | 40 | NA | 30.13 | 1020.4 | |||||
| 20 | 22:51 | W 7 | 10.00 | Overcast | OVC050 | 45 | 40 | 83% | 41 | NA | 30.13 | 1020.6 | |||||
| 20 | 21:51 | NW 5 | 10.00 | Overcast | OVC060 | 44 | 38 | 79% | 41 | NA | 30.13 | 1020.5 | |||||
| 20 | 20:51 | W 5 | 10.00 | Overcast | OVC060 | 44 | 37 | 76% | 41 | NA | 30.13 | 1020.7 | |||||
| 20 | 19:51 | N 5 | 10.00 | Overcast | BKN048 OVC070 | 44 | 38 | 79% | 41 | NA | 30.13 | 1020.7 | |||||
| 20 | 18:51 | N 8 | 10.00 | Light Rain | OVC070 | 43 | 37 | 47 | 41 | 80% | 38 | NA | 30.13 | 1020.6 | 0.01 | 0.04 | |
| 20 | 17:51 | N 9 | 8.00 | Light Rain | SCT050 OVC060 | 42 | 38 | 85% | 37 | NA | 30.16 | 1021.8 | 0.02 | ||||
| 20 | 16:51 | N 12 | 10.00 | Light Rain | OVC055 | 41 | 37 | 86% | 34 | NA | 30.18 | 1022.4 | 0.01 | ||||
| 20 | 15:51 | N 14 | 10.00 | Light Rain | BKN055 OVC070 | 45 | 32 | 61% | 39 | NA | 30.18 | 1022.5 | |||||
| 20 | 14:51 | NE 7 | 10.00 | Overcast | BKN075 OVC090 | 47 | 27 | 46% | 44 | NA | 30.21 | 1023.4 | |||||
| 20 | 13:51 | N 15 | 10.00 | Overcast | OVC095 | 46 | 25 | 44% | 40 | NA | 30.22 | 1023.6 | |||||
| 20 | 12:51 | NE 13 | 10.00 | Overcast | OVC095 | 47 | 26 | 48 | 42 | 44% | 41 | NA | 30.22 | 1023.6 | |||
| 20 | 11:51 | NE 10 | 10.00 | Overcast | BKN100 OVC150 | 48 | 26 | 42% | 44 | NA | 30.23 | 1024.1 | |||||
| 20 | 10:51 | NE 12 | 10.00 | Overcast | OVC110 | 47 | 26 | 44% | 42 | NA | 30.23 | 1024.0 | |||||
| 20 | 09:51 | NE 13 | 10.00 | Overcast | BKN110 BKN140 OVC210 | 47 | 28 | 48% | 41 | NA | 30.24 | 1024.2 | |||||
| 20 | 08:51 | E 10 | 10.00 | Overcast | BKN140 OVC250 | 47 | 30 | 52% | 42 | NA | 30.24 | 1024.4 | |||||
| 20 | 07:51 | E 5 | 10.00 | Mostly Cloudy | BKN140 BKN170 BKN250 | 44 | 30 | 58% | 41 | NA | 30.25 | 1024.6 | |||||
| 20 | 06:51 | NE 3 | 10.00 | Mostly Cloudy | BKN140 | 42 | 31 | 42 | 39 | 65% | NA | NA | 30.24 | 1024.5 | |||
| 20 | 05:51 | E 7 | 10.00 | Mostly Cloudy | FEW130 BKN200 | 40 | 31 | 70% | 35 | NA | 30.22 | 1023.8 | |||||
| 20 | 04:51 | NE 10 | 10.00 | Mostly Cloudy | FEW130 BKN200 | 40 | 31 | 70% | 34 | NA | 30.20 | 1023.0 | |||||
| 20 | 03:51 | Calm | 10.00 | Overcast | OVC230 | 40 | 30 | 68% | NA | NA | 30.25 | 1024.6 | |||||
| 20 | 02:51 | NE 6 | 10.00 | Partly Cloudy | SCT250 | 40 | 29 | 65% | 36 | NA | 30.24 | 1024.5 | |||||
| 20 | 01:51 | NE 3 | 10.00 | Mostly Cloudy | SCT170 BKN250 | 41 | 30 | 65% | NA | NA | 30.25 | 1024.8 | |||||
| 20 | 00:51 | N 5 | 10.00 | Overcast | OVC180 | 41 | 29 | 48 | 40 | 62% | 38 | NA | 30.24 | 1024.3 |
CHICAGO O’HARE CURRENT AND HISTORY (3-DAY) … | NWS Chicago Office OBSERVED WEATHER REPORTS
SUMMARY: Developing
| Twitter group from National Weather Service Chicago, Local Chicago Media, and The Weather Channel. |
How the cold of Wed, May 20th stacked up to the late spring record books in northern Illinois http://t.co/6rdHvkoi8f pic.twitter.com/MRtFBZPIm5
— NWS Chicago (@NWSChicago) May 21, 2015
Rockford high today of 47° breaks the old record for May 20 of 51° (2002). Coldest May high since 47° on May 3, 2011. http://t.co/6rdHvkoi8f
— NWS Chicago (@NWSChicago) May 20, 2015
Slowly warming temperatures into the end of the work week. pic.twitter.com/okTIwZrJah
— NWS Chicago (@NWSChicago) May 20, 2015
Today’s will be more like November than late May, w/some rain expected, mainly south of I-80. Warmer tomorrow! pic.twitter.com/lx7qj5KLJw
— NWS Chicago (@NWSChicago) May 20, 2015
Receiving multiple reports of ice pellets mixing in with rain in Rockford area. Mix likely to be brief & then change to rain. #WhereIsSpring
— NWS Chicago (@NWSChicago) May 20, 2015
CLIMATE DATA FROM THE NATIONAL WEATHER SERVICE CHICAGO OFFICE …
+ + + +
000
CDUS43 KLOT 210632
CLIORD
CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
132 AM CDT THU MAY 21 2015
...................................
...THE CHICAGO-OHARE CLIMATE SUMMARY FOR MAY 20 2015...
CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1871 TO 2015
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
..................................................................
TEMPERATURE (F)
YESTERDAY
MAXIMUM 48 1111 AM 95 1977 71 -23 85
MINIMUM 39 240 AM 33 2002 49 -10 62
AVERAGE 44 60 -16 74
PRECIPITATION (IN)
YESTERDAY 0.04 2.54 1975 0.12 -0.08 0.82
MONTH TO DATE 3.12 2.36 0.76 4.73
SINCE MAR 1 7.09 8.24 -1.15 9.28
SINCE JAN 1 9.95 11.76 -1.81 14.58
SNOWFALL (IN)
YESTERDAY 0.0 0.0 MM 0.0 0.0 0.0
MONTH TO DATE 0.0 0.0 0.0 0.0
SINCE MAR 1 7.1 6.8 0.3 13.7
SINCE JUL 1 50.7 36.6 14.1 82.0
SNOW DEPTH 0
DEGREE DAYS
HEATING
YESTERDAY 21 6 15 0
MONTH TO DATE 146 170 -24 181
SINCE MAR 1 1516 1503 13 1694
SINCE JUL 1 6696 6237 459 7109
COOLING
YESTERDAY 0 2 -2 9
MONTH TO DATE 29 20 9 25
SINCE MAR 1 29 30 -1 26
SINCE JAN 1 29 30 -1 26
..................................................................
WIND (MPH)
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION N (20)
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION N (20)
AVERAGE WIND SPEED 8.2
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.9
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 86 400 PM
LOWEST 42 1100 AM
AVERAGE 64
..........................................................
THE CHICAGO-OHARE CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 72 92 1977
1934
MINIMUM TEMPERATURE (F) 50 31 2002
SUNRISE AND SUNSET
MAY 21 2015...........SUNRISE 526 AM CDT SUNSET 811 PM CDT
MAY 22 2015...........SUNRISE 525 AM CDT SUNSET 812 PM CDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
+ + + +
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