Temperature Monitoring Station:
ATI CHAD ATI

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		3.63
After quality control		2.43
After breakpoint alignment		0.79
Regional expectation during same months		0.66 ± 0.57
National average during same months		0.38 ± 0.72
Global land average during same months		0.24 ± 0.16

Regional Consistency

Comparison of monthly mean station data to regional expectation

	Typical Difference (°C, 95% range)	Correlation (R value)
Raw Monthly Anomalies	± 1.7	0.81
After Quality Control	± 1.0	0.91
After Breakpoint Adjustment	± 0.9	0.92

Quality Control Summary

Months missing 10 or more days	72
Serially repeated daily or monthly values	16
Extreme local outliers	5
Regional climatology outliers	0
Abrupt jumps	0
Marked as bad or manually changed by source	0
Exceeds global climatological range	0
Isolated observations	6
Frame shift repetitions	0
TMAX / TMIN inconsistency	0
TAVG outside TMAX / TMIN range	0
Total Observations Rejected by Quality Control	77

Station ID Codes

GHCND	CD000004751
GHCND	CD000064751
GHCNM	11064751000
GSOD	647510-99999
HADCRU	647510
USAF	647510
WMO	64751
WMSSC	647510

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.