Temperature Monitoring Station:
SEATTLE SEATTLE-TACOMA INTL A

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		0.88
After quality control		0.86
After breakpoint alignment		0.70
Regional expectation during same months		0.74 ± 0.15
National average during same months		0.92 ± 0.10
Global land average during same months		1.06 ± 0.04

Regional Consistency

Comparison of monthly mean station data to regional expectation

	Typical Difference (°C, 95% range)	Correlation (R value)
Raw Monthly Anomalies	± 1.4	0.88
After Quality Control	± 1.4	0.87
After Breakpoint Adjustment	± 1.2	0.90

Quality Control Summary

Months missing 10 or more days	1
Serially repeated daily or monthly values	1
Extreme local outliers	2
Regional climatology outliers	0
Abrupt jumps	1
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	4

Station ID Codes

COOP	457458
COOP	457473
COOP	457478
COOP	457488
FAA	SEA
GHCND	USC00457478
GHCND	USW00024233
GHCND	USW00024281
GHCNM	42500457458
GHCNM	42572793000
GHCNM	42572793006
GSOD	727930-24233
GSOD	999999-24233
HADCRU	720558
HADCRU	727930
HADCRU	727931
ICAO	KSEA
NCDC	20027732
NCDC	20027760
NCDC	20027775
NCDC	20027777
NWS	SEA
NWS	SEUW1
USAF	727930
WBAN	24233
WBAN	24281
WMO	72793
WMSSC	727930
WWR	72793

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.