Temperature Monitoring Station:
HELENA/COUNTY-CITY, MT.

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		0.77
After quality control		0.78
After breakpoint alignment		0.96
Regional expectation during same months		0.94 ± 0.19
National average during same months		0.94 ± 0.12
Global land average during same months		1.06 ± 0.05

Regional Consistency

Comparison of monthly mean station data to regional expectation

	Typical Difference (°C, 95% range)	Correlation (R value)
Raw Monthly Anomalies	± 2.7	0.87
After Quality Control	± 2.7	0.87
After Breakpoint Adjustment	± 2.7	0.87

Quality Control Summary

Months missing 10 or more days	1
Serially repeated daily or monthly values	1
Extreme local outliers	0
Regional climatology outliers	2
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	3

Station ID Codes

COOP	244050
COOP	244055
COOP	244057
FAA	HLN
GHCND	USC00244050
GHCND	USW00024144
GHCND	USW00094104
GHCNM	42500244055
GHCNM	42572772000
GSOD	727720-24144
GSOD	999999-94104
HADCRU	727720
ICAO	KHLN
NCDC	20012431
NCDC	20012444
NCDC	20012456
NWS	HLN
USAF	727720
WBAN	24144
WBAN	94104
WMO	72772
WMSSC	727720
WWR	72772

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.