Time of Observation Bias (TOBS) is the first refuge of climate scoundrels. It is normally described by alarmists as “they used to take temperatures in the afternoon, but now they take them in the morning.”
This explanation is complete nonsense. Min/Max thermometers record the lowest minimum and highest maximum since the last time they were reset. The actual claim is that people used to be incredibly stupid and reset their thermometer only once per day near the afternoon maximum, causing double counting of warm temperatures on cold days which fell after warm days.
Even using NCDC fake data, this claim doesn’t hold up. NCDC TOBS adjusted temperatures show no US warming over the past 25 years. All of the reported US warming over the past 25 years is due to infilling fake data. NCDC TOBS adjusted temperatures show no warming since 1990.
And TOBS is easy enough to test in the real world (as opposed to Zeke’s fake models) by simply excluding the claimed TOBS affected (afternoon) stations from the analysis. This experiment yields a result showing that TOBS has almost no effect on US temperature trends.
The trend for all stations (below) is nearly identical to the trend for non-TOBS affected stations.
Non-TOBS affected stations also show that the 1930’s were much hotter.
Global temperatures are not affected by TOBS, yet they do the same data tampering on global temperatures as they do on US temperatures.
TOBS is just one more way which government experts will attempt to defraud Congressmen and women in the upcoming hearings.