Search Results for: tobs

There are 317 US HCN stations which took their readings at morning or night on July 15, 1936. Maximum temperatures at these stations are unaffected by TOBS (time of observation bias) and are less affected by UHI (urban heat island) … Continue reading →

Someone suggested that the divergence between measured US temperatures and NCDC published US temperatures is due to Time Of Observation Bias. I tested that out by comparing only versus stations which took morning or night readings on July 15, 1936. … Continue reading →

There are 318 US HCN stations which recorded temperatures at morning or night on July 15, 1936. These stations could not possibly have double counted 90 degree temperatures on that date, which is the theory that NCDC uses as justification … Continue reading →

Last week I showed some graphs like the ones below, which demonstrate that the TOBS (time of observation bias) adjustment is bogus. Stations which took their readings during the morning on July 15, 1936 are actually cooling slightly relative to the July … Continue reading →

Someone was suggesting earlier that the graph below showing NCDC TOBS adjustments are unwanted, might just be a coincidence. So I did a correlation between the two data sets, and found it is excellent. The important thing to remember is these two … Continue reading →

The graph below shows US summer afternoon temperatures since 1895, sorted into two groups based on the time of day when their reading was taken on July 15, 1936. The time of day data was taken from this 2008 archived … Continue reading →

Below is the list of morning and afternoon stations from July 15, 1936

The graph below organizes US HCN stations into two groups. Those that took morning readings (i.e. reset the thermometer in the morning or night) on July 15, 1936 and those which took afternoon readings (reset in the afternoon) on that date. … Continue reading →

The graph below is another TOBS killer. It shows the difference in summer temperature between US HCN stations which took morning readings on July 15, 1936 and those which took afternoon readings on that date. The trend is down, indicating … Continue reading →

One of the funnier claims about TOBS is that the frequency of 100 degree temperatures in the 1930’s was due to double counting at stations which reset their thermometers in the afternoon. I put that to the test by identifying … Continue reading →