Figure 1. Comparison of Wauseon and Cleveland mean annual temperature traces. The two data sets track each other very closely, except that Wauseon has averaged around a degree or so less than Cleveland since the beginning of the records in 1870.

As displayed in the figure above, both Wauseon and Cleveland have demonstrated similar temperature trends since the late 19th Century. The top ten warmest and coldest years on record at both sites show strong correlation. At Cleveland, the warmest year on record was 1998 with a mean temperature of 53.5F. This was the seventh warmest year on record at Wauseon with a mean temperature of 51.9F. At Wauseon, the warmest year on record was 1931 with a mean temperature of 53.3F. This was the second warmest year on record at Cleveland with a mean temperature of 53.5F. At both locations, the coldest year on record occurred in 1875. The mean temperature at Cleveland was 45.4F, and at Wauseon 44.2F. Annual temperatures this low no longer occur at any location in the State of Ohio.

At both Wauseon and Cleveland, the first seven months of 2012 were the warmest such period on record. At Wauseon, the mean temperature was 53.2F. The existing record was 52.6F in 1921. The warmest year on record, 1931, had a mean temperature of 50.5F through July. At Cleveland, the mean temperature was 54.6F. The existing record was 52.9F in 1921. The warmest year on record, 1998, had a mean temperature of 52.5F through July. Given the large surpluses over existing record years, 2012 seems likely to take the top spot in both locations.

1998 53.5 1875 45.4
1931 53.4 1917 46.3
1953 53.0 1856 46.3
1921 53.0 1885 46.4
1949 52.9 1904 46.7
1991 52.8 1868 47.2
2010 52.7 1963 47.4
1938 52.7 1924 47.4
1973 52.6 1907 47.6
1946 52.5 1883 47.6

Table 1. Top ten warmest and coldest years on record at Cleveland, OH.

1931 53.3 1875 44.2
1991 52.5 1885 44.6
1941 52.5 1883 45.4
1987 52.4 1917 45.5
1921 52.3 1904 45.7
1990 52.2 1924 46.5
1998 51.9 1963 46.6
1938 51.9 1873 46.6
1939 51.7 1872 46.6
1933 51.4 1888 46.7

Table 2. Top ten warmest and coldest years on record at Wauseon, OH.

I will continue publishing the monthly data for Cleveland through December. When I get around to it, I intend to do the same for the Wauseon data. In the future, I plan on publishing additional high-quality, long-duration temperature records in the state. One of the oldest records was from North Lewisburg, in west-central Ohio. This record dates to 1823. Unfortunately, North Lewisburg is not a USHCN station and records ceased sometime in the early 1900s. There is an existing station in Urbana, Ohio, which is also in Champaign County. However, the North Lewisburg station averaged about 1.5F warmer during a period of overlap, which would make direct comparisons more difficult.

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