Temperature Monitoring Station:
CHICAGO/O'HARE, ILLINOIS

Monthly Mean Temperature Data

Raw Data relative to Expected Monthly Means

Difference from Regional Expectation

Breakpoint Adjusted Annual Average Comparison

Mean Rate of Change ( °C / Century )

Raw monthly anomalies		0.01
After quality control		0.00
After breakpoint alignment		0.93
Regional expectation during same months		1.03 ± 0.17
National average during same months		0.88 ± 0.13
Global land average during same months		0.98 ± 0.06

Regional Consistency

Comparison of monthly mean station data to regional expectation

	Typical Difference (°C, 95% range)	Correlation (R value)
Raw Monthly Anomalies	± 4.3	0.68
After Quality Control	± 4.3	0.68
After Breakpoint Adjustment	± 4.2	0.70

Quality Control Summary

Months missing 10 or more days	1
Serially repeated daily or monthly values	1
Extreme local outliers	0
Regional climatology outliers	0
Abrupt jumps	0
Marked as bad or manually changed by source	0
Exceeds global climatological range	0
Isolated observations	0
Frame shift repetitions	0
TMAX / TMIN inconsistency	0
TAVG outside TMAX / TMIN range	0
Total Observations Rejected by Quality Control	1

Station ID Codes

COOP	111549
COOP	111577
FAA	MDW
FAA	ORD
GHCND	USC00111577
GHCND	USW00014819
GHCND	USW00094846
GHCNM	42572530000
GHCNM	42572534000
GSOD	725340-14819
GSOD	725340-99999
GSOD	999999-14819
GSOD	999999-94846
HADCRU	725300
HADCRU	725340
ICAO	KMDW
ICAO	KORD
NCDC	10003214
NCDC	20005916
NCDC	20006002
NWS	MDW
NWS	MDWI2
NWS	ORD
USAF	725340
WBAN	14819
WBAN	94846
WMO	72530
WMO	72534
WMSSC	725300
WWR	72530
WWR	72534

ID codes may be repeated if the identification of the station changed during its history or if two different records were found to contain the same data, in which case the records would be merged.