Climate and Precipitation

F. Climate and Precipitation

The Darby Creek Watershed lies in the temperate climate of Central Ohio . The Midwestern Regional Climate Center (MRCC) collects historical climate data from various observer stations throughout the Midwest . In the Darby Creek Watershed, these stations are located in Irwin, Marysville, and Circleville. Data from the Irwin, Ohio, station is represented in Figure 11 as a representation of the climate in the Darby Watershed.

Figure 11: Irwin, Ohio Station
Data collected between 1991 and 1997
Temperature Range
Temperature Range	(January) 27.0 (F)	(July) 74.1 (F)
Mean Temperature	52.2 (F)
Growing Season
Growing Season Range	(Shortest) 123 days	(Longest) 197 days
Median Growing Season	151 days
Earliest Frost	September 13^th
Latest Frost	May 28^th
Precipitation
Precipitation Range	(February) 1.95"	(July) 4.65"
Average Annual Rainfall	38.14"

For the years 1991 to 1997, there was a mean temperature range of 27 degrees Fahrenheit (F) in January and 74.1 degrees F in July, with an annual mean temperature of 52.2 degrees. During the same period of time the growing season had a median of 151 days, with the shortest being 123 days and the longest 197 days. The median start date for planting was May 5 and for harvest was October 3. The earliest frost occurred on September 13 and the latest May 28. Normal precipitation for the area ranges from 1.95 inches in February to 4.65 inches in July with the heaviest normal rainfall occurring in June and July. The average annual rainfall is 38.14 inches.

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Last updated: August 18, 2008.