To assist Anthony Watts survey all of the Historical Climatology Sites in California, Ellen and I are visiting reachable Sierra Sites. Please note the cooling trend at Colfax since 1949. Grass Valley has experienced similar trends, so where it all that global warming caused by rising levels of CO2. However, plots starting from 1871, 20 years after the end of the Little Ice Age, it is possible to observe a slight warming trend. But, most of this warming came before a major rise in CO2 after 1980.
Colfax, CA (Location is CDF Facility on Iowa Hill Road)
05/17/07 at 3:10PM
Survey By: Russ and Ellen Steele
USHCN Reported Coordinates of Site: COLFAX (39.11°N, 120.95°W; 735 m)
Measured GPS Coordinates of site:
Lat./Long. 39.09028N, 120.94820W Elevation 707m( 2319 feet)
Site description and know history:
The site was recently moved in the last year from the waste water plant to the current location at the CDF facility, due to vandalism at the water plant.
Curator Notes: The site manager is Mike Crumm.(notes on request by e-mail)
Site Survey Notes:
1) The shelter is in good condition and appears to have been painted with latex paint, see pictures.
2) The site is on a grassy slope, with a small bush starting to grow next to the metal structure holding the shelter.
3) The nearest asphalt is a drive way near a house with some low concrete retaining walls about 50 feet from the shelter.
4) Shelter temperatures: Shady side: 77.5 Sunny side: 88.0
Images of the site: (Click for a larger image)
Temperature plot from 1871 to 2005, using the the USHCN corrected data. During this time period there was data missing in some records. These records were normalized for the historical data base. Note the very slight warming trend
Here is a plot from 1949 to 2006 using data provided by the Western Regional Climate Center, Reno Nevada Note the more pronounced cooling trend.