Wednesday’s High of 47°F Was a Record Cold Temperature for May 20

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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.








CLIMATE DATA FROM THE NATIONAL WEATHER SERVICE CHICAGO OFFICE …

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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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