Below are graphs of the monthly mean temperature trace at Cleveland for the period 1856 to the present for the months of January, February, and March. The downtown station averaged around 1-1.5F warmer during these months than the present airport site during periods of record overlap. This would tend to make the displayed trend smaller, but this effect is probably mitigated to some degree by the increasing urban character of the airport site with time. All three months show a warming trend. The trend for January is fairly small, but March shows a significant warming trend of 3F per century over the entire record. This is consistent with trends found by NCDC for the State of Ohio. In all three graphs, the top ten warmest and top ten coldest readings are depicted.Figure 1. January monthly mean air temperature at Cleveland, 1856-2012. The warmest month is 1932 with a mean temperature of 40.2F; the coldest is 1977 with a mean of 11.0F. The average for the period of record is 27.1F; the current 30-year (1981-2010) normal is 28.1F.

Figure 2. February monthly mean air temperature at Cleveland, 1856-2012. The warmest months are 1998 & 1857 with a mean temperature of 37.6F; the coldest is 1875 with a mean of 15.8F. February 2012 was the ninth warmest on record with a mean of 34.9F. The average for the period of record is 28.2F; the current 30-year (1981-2010) normal is 30.5F.

Figure 3. March monthly mean air temperature at Cleveland, 1856-2012. The warmest month is 2012 with a mean temperature of 51.4F; the coldest is 1960 with a mean of 24.0F. Prior to 2012, the warmest March occurred in 1946, with a mean temperature of 49.5F. The average for the period of record is 36.3F; the current 30-year (1981-2010) normal is 38.4F.

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