![]() Last month started with rain and snow for most of the state, followed by two weeks when most of the state received less than half an inch of total precipitation. The preliminary statewide average January temperature was 28.8 degrees, 2.4 degrees above the 1981–2010 normal and the 36 th warmest on record going back to 1895.Ĭlimatologically, January is one of the drier months of the year in Illinois. January average temperature (left) and departure from the 1981-2010 normal (right). As the maps below show, January average temperatures ranged from the mid-20s in northern Illinois to the high 30s in southern Illinois, which was between 3 and 5 degrees above the 1981–2010 normal (Figure 2). This was the daily high minimum temperature record in Rockford. Daily temperature in Peoria, expressed as a departure from the long-term average.ĭespite the consistency of warmer than average conditions last month, only one daily temperature record was broken. For example, Marengo in McHenry County has accumulated just over 3,600 heating degree days in the winter season to date, compared to a 30-year normal of 4,100 by this time. The lack of very cold days and nights this winter season has resulted in below average heating degree days, a metric often used to estimate and predict energy demand for heating. Only 7 out of 31 January days were cooler than average in Peoria. ![]() Figure 1 (below) shows January daily average temperature as a departure from average in Peoria. Preliminary statewide average total January precipitation was 2.56 inches, 0.49 inches above the 1981–2010 normal and tied for the 32 nd wettest on record going back to 1895.ĭata are provisional and may change slightly over timeįollowing a warmer than average December, temperatures remained persistently above average throughout January. The preliminary statewide average January temperature was 28.8 degrees, 2.4 degrees above the 1981–2010 normal and tied for the 36 th warmest on record going back to 1895. Our first month of 2021 was quite a bit warmer and slightly wetter than average across the state.
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