Category Archives: UHI

Articles on the Urban Heat Island anomaly relating to the surface record

realclimate and Disinformation on UHI

In a recent CNN interview discussed at RC here, Joe D’Aleo said: Those global data sets are contaminated by the fact that two-thirds of the globe’s stations dropped out in 1990. Most of them rural and they performed no urban adjustment. And, Lou, you know, and the people in your studio know that if they […]

Tucson Update

You may recall the post earlier this year where the USHCN official climate station with the largest positive trend in the USA turned out to be located in a parking lot at the University of Arizona in Tucson. See below: Click picture to see image gallery at The GISS surface temperature plot for Tucson: […]

The HO-83 Hygro- thermometer

In the discussion of the Tucson weather station, Ben Herman of the U of Arizona observed that there were serious biases with the HO-83 hygrothermometer – introduced in the early 1990s – which was said to be a contributor to the uptick to Tucson values. Although USHCN has implemented adjustments to U.S. data to deal […]

Trends in Peterson 2003

Peterson 2003 stated: Contrary to generally accepted wisdom, no statistically significant impact of urbanization could be found in annual temperatures. Last week, Peterson sent me a list of the 289 sites used in this study, together with the classification into urban and rural. As I noted previously, there are many puzzles in the allocation of […]

Peterson’s “Urban” Sites

I posted up the list of 289 sites from Peterson 2003 purporting to show that the difference between “urban” and rural sites was negligible. (See related posts here and here.) As noted before, the definition of “urban” includes such metropolises as Wahpeton ND and Hankinson ND. Cottage Grove 1S OR is classified as “urban”, while […]

Peterson (2003)

Peterson (2003) online here is an influential study cited by IPCC AR4 purporting to show that the urbanization effect is negligible. It concluded: Using satellite night-lights—derived urban/rural metadata, urban and rural temperatures from 289 stations in 40 clusters were compared using data from 1989 to 1991. Contrary to generally accepted wisdom, no statistically significant impact […]


A Tucson climate scientist commenting on the location of the University of Arizona weather station in parking lot acknowledged that: It’s true that situating a weather station in a parking lot is not the best location. An understatement to day the least. He argued against locating the weather station on a nearby lawn: The emissivity […]

Turbo Bias

Warren Meyers, who got the pictures of Tucson’s asphalt climate station, went to another USHCN station today. He writes in his blog: “I then went to visit Wickenburg. Though it has been growing of late, Wickenburg would still be considered by most to be a small town. So perhaps the Wickenburg measurement is without bias?” […]

Tucson's Amazing USHCN Station

Warren Meyer, one of the first volunteers, delivered Tucson today. You may remember from the “Red and Blue States” thread on CA that Tucson had the greatest positive temperature trend for any USHCN station after TOBS adjustment. I’ve been trying to find the words to describe this station, but the pictures really do a […]

USHCN Waste Water Treatment Plants

I’ve been involved in meteorology in one way or another since 1976, and while I knew of the vast number of COOP stations around the USA, I never knew that a good number of them are at sewage treatment plants until I started my project. It seems to me, that given the physical makeup […]