NASA/NOAA US Data Tampering

The vast majority of the world’s high quality historical temperature data comes from the United States. NOAA has no long term daily temperature from most of the earth’s surface.

In 1999, NASA’s James Hansen was upset that the US temperature trend didn’t match the imaginary warming trend he had created for the rest of the world.

“in the U.S. there has been little temperature change in the past 50 years, the time of rapidly increasing greenhouse gases — in fact, there was a slight cooling throughout much of the country ….. climate trends have been fundamentally different in the U.S. than in the world as a whole.”

NASA GISS: Science Briefs: Whither U.S. Climate?

So NASA and NOAA did just what would expect them to, they altered the US temperature data to match the fake global temperature.

NASA 1999

NASA 2019

In 2005 the adjustments totaled 0.5F and tailed off after 1990.

Wayback Machine

The Time of Observation Bias adjustment totaled 0.3F and tailed off after 1995.

Wayback Machine

Wayback Machine

Now the adjustments are much larger.

The TOB adjustment has doubled in size and no longer tails off after 1990.

Here are the specifics of the current adjustments for maximum temperature.

I used a simple average of the data per year to generate these graphs. People have complained that the data needs to be gridded because of uneven distribution of stations, but the data doesn’t support that idea, NOAA temperature graphs are almost identical to the average of the final adjusted data set.

National Time Series | Climate at a Glance | National Centers for Environmental Information (NCEI)

An easy way to test time of observation bias is to split the stations into two groups – morning stations and afternoon stations.  The trends are almost identical, but morning stations are warmer because people in warmer climates are more likely to go outside and take readings during the morning.

This the split of groups for Missouri. The afternoon stations were more than half a degree cooler.

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

One adjustment has some legitimacy. There has been a large loss in stations over the past 30 years, which has caused the average latitude to move north.

Using only the set of stations with a 100 year long record, there is more warming over the past 30 years.

The number of hot days is not much affected however.