Dismantling The Time Of Observation Bias

The Time of Observation Bias (TOB) adjustment is the primary excuse for rewriting US temperature history.

NASA 1998

NASA 2019

I have new tools in place which show what a farce that is. The graph below plots the summer 1936 average daily maximum temperature of all Missouri stations which took their readings during morning/night in blue, and all stations which took their readings during afternoon/evening in red. The yellow line is the average for all Missouri stations this summer. The reason I used Missouri is that they have an excellent temperature record, the state is small, and had a nearly even mix of morning and afternoon stations during 1936.

Spreadsheet

As you can see, there is very little difference between the morning and afternoon stations from 1936, but there is a huge difference between 1936 and 2019. This summer has been thirteen degrees cooler than 1936.

The afternoon stations in the graph above average about 0.7F warmer than the morning stations.  Let’s look at what is causing this. The trend since 1895 is nearly identical for both groups, with the set of afternoon stations consistently warmer by about 0.7F until the most recent decade.

The cause of this is that the afternoon stations in 1936 averaged about half a degree of latitude (35 miles) further south, which corresponds to about 0.9F warmer temperatures.

The entire (tiny) difference between morning and afternoon stations can be completely accounted for by differences in latitude.  There is no indication TOB has any impact on measured temperatures. TOB is just one more lame excuse to erase America’s hot past.

Station information was taken from here.  NOAA is making it harder and harder to find this information, so I had to pull it off the web archive.

1936 Morning Stations
USC00232809.dly : FARMINGTON MO 37.7922 -90.4103
USC00234271.dly : JEFFERSON CITY WTP MO 38.5853 -92.1825
USC00234705.dly : LAMAR 7N MO 37.5983 -94.2842
USC00234825.dly : LEBANON 2W MO 37.685 -92.6939
USC00234850.dly : LEES SUMMIT REED WR MO 38.8803 -94.3358
USC00234904.dly : LEXINGTON 3E MO 39.1828 -93.855
USC00235541.dly : MEXICO MO 39.1756 -91.8861
USC00235671.dly : MOBERLY MO 39.4194 -92.4369
USC00235834.dly : MTN GROVE 2 N MO 37.1542 -92.2619
USC00238523.dly : UNIONVILLE MO 40.475 -93.0031

1936 Afternoon Stations
USC00230204.dly : APPLETON CITY MO 38.1872 -94.0283
USC00230856.dly : BOWLING GREEN 1 E MO 39.3444 -91.1711
USC00231037.dly : BRUNSWICK MO 39.4247 -93.1331
USC00231364.dly : CARUTHERSVILLE MO 36.1875 -89.66
USC00231711.dly : CLINTON MO 38.395 -93.7711
USC00231822.dly : CONCEPTION MO 40.2394 -94.6833
USC00232289.dly : DONIPHAN MO 36.6206 -90.8125
USC00235027.dly : LOCKWOOD MO 37.3908 -93.9492
USC00235253.dly : MARBLE HILL MO 37.3036 -89.9664
USC00235976.dly : NEOSHO MO 36.865 -94.3603
USC00237263.dly : ROLLA MISSOURI S&T MO 37.9567 -91.7761
USC00237963.dly : SPICKARD 7 W MO 40.2472 -93.7158
USC00238051.dly : STEFFENVILLE MO 39.97 -91.8875
USC00238223.dly : SWEET SPRINGS MO 38.9664 -93.4194
USC00238466.dly : TRUMAN DAM & RSVR MO 38.2597 -93.4136
USC00238725.dly : WARRENTON 1 N MO 38.835 -91.1386

If TOB doesn’t work in Missouri, it isn’t going to work anywhere.

About Tony Heller

Just having fun
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