The UAH LT global anomaly image for January, 2018 should be available in the next few days here. The linear temperature trend of the global average lower tropospheric temperature anomalies from January 1979 through January 2018 remains at +0.13 C/decade. The last time the Southern Hemisphere was this cool (+0.06 deg. C one-month drop in January tropical temperatures was tied for the 3rd largest, beaten only by October 1991 (0.51 deg. Out of the 470 month satellite record, the 0.38 deg. The last time the tropics were cooler than this was June, 2012 (-0.15 deg. Note that La Nina cooling in the tropics has finally penetrated the troposphere, with a -0.12 deg. The global, hemispheric, and tropical LT anomalies from the 30-year (1981-2010) average for the last 13 months are: The inclusion of two of the same calendar months on the ends of the 13 month averaging period causes no issues with interpretation because the seasonal temperature cycle has been removed as has the distinction between calendar months. The 13-month centered average is meant to give an indication of the lower frequency variations in the data the choice of 13 months is somewhat arbitrary… an odd number of months allows centered plotting on months with no time lag between the two plotted time series. Global area-averaged lower tropospheric temperature anomalies (departures from 30-year calendar monthly means, 1981-2010).
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