New paper finds 100% of the trend in number of "hot days" is artificial, due to poor-siting of thermometers, not global warming

A paper published today in Theoretical and Applied Climatology examines the effect of urbanization on extreme temperature readings in North China and finds statistically significant evidence that urbanization [the Urban Heat Island [UHI] effect] is responsible for 100% of the artificial trend in number of hot days, and 94.1% of the artificial trend in extreme maximum temperatures. In other words, 100% of the reported trends in the number of hot days are due to poor-siting of temperature stations, and have absolutely nothing to do with alleged man-made global warming.

The artificial urbanization contributions to overall trends reported by the authors are:

Urbanization contributions to the overall trends:

hot days 100%

cold days 38%

frost days 42.2%

diurnal temperature range (DTR) 40%

extreme maximum temperature 94.1%

extreme minimum temperature 47%

Urbanization effect on long-term trends of extreme temperature indices at Shijiazhuang station, North China

Latest Results for Theoretical and Applied Climatology 

Based on daily temperature data from an urban station and four rural stations of Shijiazhuang area in Hebei Province, North China, we analyzed the trends of extreme temperature indices series of the urban station (Shijiazhuang station) and rural stations during 1962–2011 and the urbanization effect on the extreme temperature indices of the urban station. The results showed that the trends of annual extreme temperature indices of the urban station and the rural stations are significantly different in the recent 50 years. Urbanization effect on the long-term trends of hot days, cold days, frost days, diurnal temperature range (DTR), extreme maximum temperature, and extreme minimum temperature at the urban station were all statistically significant, reaching 1.10 days/10 years, −2.30 days/10 years, −2.55 days/10 years, −0.20 °C/10 years, 0.16 °C/10 years, and 0.70 °C/10 years, respectively, with the urbanization contributions to the overall trends reaching 100, 38.0, 42.2, 40.0, 94.1, and 47.0 %, respectively. The urbanization effect on trend of ice days was also significant, reaching −0.47 days/10 years. However, no significant urbanization effect on trends of minimum values of maximum temperature and maximum values of minimum temperature had been detected. The urbanization effects in the DTR and extreme minimum temperature series of Shijiazhuang station in wintertime were highly significant.