However, in addition to the overall higher summer average nighttime temperatures, the state has experienced an This lack of summer warming is reflected in a below average occurrence of very hot days (Figure 2a). Summer days have not warmed substantially in the state, a feature characteristic of much of

The second hottest year was 2012, with an average temperature of 54.0☏. Observations through 2020, 1998 was the hottest year on record, with an annual average temperature for the state ofĥ4.1☏. Since the 1970s, annual average temperature has risen more than 2☏. The 1930s through the mid-1950s were generally above the long-term average but were followed by the coldest The 2000s and 2010s were warmer than in any other historical period (Figure 1). Since the beginning of the 20th century, temperatures in Ohio have risen more than 1.5☏, and temperatures in Less warming is expected under a lower emissions future (the coldest end-of-century projections being about 3☏ warmer than the historical average green shading) and more warming under a higher emissions future (the hottest end-of-century projections being about 11☏ warmer than the hottest year in the historical record red shading). Historically unprecedented warming is projected to continue through this century. Observed temperatures are generally within the envelope of model simulations of the historical period (gray shading). Shading indicates the range of annual temperatures from the set of models. Temperatures in Ohio (orange line) have risen more than 1.5☏ since the beginning of the 20th century.

Projected changes for 2006–2100 are from global climate models for two possible futures: one in which greenhouse gas emissions continue to increase (higher emissions) and another in which greenhouse gas emissions increase at a slower rate (lower emissions). Figure 1: Observed and projected changes (compared to the 1901–1960 average) in near-surface air temperature for Ohio.

Columbus ohio weather records