Placerville Ca. CWOP Statistics and Data Quality

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Data Quality for Placerville, CA
Citizens Weather Observer Program
CWOP ID - C6129

Current Time Span Selected: 28 Days

Barometer Graph
Madis Value:	97%
Data Span:	28 Days
Average Barometer Error:	-4.6 milliBars
Error Standard Deviation:	3.3 milliBars

Temperature Graph
Madis Value:	99%
Data Span: 28 Days	24 Hours	Daytime	Nighttime
Average Temp. Error:	1.1 °F	0.7 °F	1.3 °F
Error Standard Deviation:	2.7 °F	3.6 °F	1.9 °F

Dewpoint Graph
Madis Value:	97%
Data Span: 28 Days	24 Hours	Daytime	Nighttime
Average Dewpoint Error:	-0.4 °F	-0.2 °F	-0.5 °F
Error Standard Deviation:	1.8 °F	1.9 °F	1.8 °F

Humidity Graph
Madis Value:	[ QC only available for Dewpoint ]
Data Span: 4 Weeks	24 hours:
Average Humidity Error:	-3.8 %
Error standard deviation
Error Standard Deviation:	7.8 %
Worst a

Todays Wind Chart
Madis Value:	%

Last 7 Days Wind Chart
Madis Value:	%

Barometric Pressure Last 14 Days Quality Spread Distribution

Temperature Last 14 Days (All Readings) Quality Spread Distribution

Daytime Temperature Last 14 Days Quality Spread Distribution

Nighttime Temperature Last 14 Days Quality Spread Distribution

Dew Point Last 14 Days Quality Spread Distribution

Wind Speed Last 14 Days Quality Spread Distribution

El Dorado Weather is a proud member of the Citizen Weather Observer Program (CWOP). The above charts represent data reported to CWOP for Placerville, CA (C6129 actuals in blue) with the predicted data based on surrounding stations (C6129 Analysis in red).

Data Quality: The MADIS value represents the percentage of observations that have successfully passed the MADIS QC checks. If the Madis rating is within the acceptable limits, a green check

will appear. Otherwise, a red x-mark

will appear indicating that the data has not passed quality control.

Errors: If the above errors are POSITIVE, this means that the analysis variable is HIGHER than the reported variable. This means that the sensor is reading a variable lower than expected. If the above errors are NEGATIVE, this means that the analysis variable is LOWER than the reported variable. This means that the sensor is reading a variable higher than expected.

CWOP: The Citizen Weather Observer Program (CWOP) is a private-public partnership with the National Oceanic & Atmospheric Administration. Its three main goals:
1. To collect weather data contributed by citizens.
2. To make these data available for weather services.
3. To provide feedback to the data contributors so that they have the tools to check and improve their data quality.

Many thanks go to Phillip Gladstone at CWOP for his dedication to providing the needed accuracy and quality checks for the amateur weather observer.

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