Spring Frost/Freeze Info for the Area

Growing season is almost underway across the area and it's that time of year when crops/fruit trees/gardens and other vegetation could become susceptible to the possibility for frost and near freezing temperatures at night. Typically, frost can occur when the temperature falls below 36°F, especially in rural areas. It is a localized phenomena and can be quite variable across a small area. While the National Weather Service does not keep track of "frost" in observations per se, we do keep track of when temperatures hit the freezing mark or fall below. Frost becomes more widespread when the temperature falls below 32°F with some freeze possible. A hard freeze is possible when temperatures fall below 28°F. The maps below, courtesy of the Midwestern Regional Climate Center, show dates for various spring freeze parameters. Click on the images for a larger resolution or see additonal maps here.

 


Freeze Information for the Local Area

The table below shows the normal last, earliest last, and latest date of temperatures at or below 32°F for the spring season at locations across the area.

Location Normal Last Date* Earliest Late Date Latest Date Record Period
Benton Harbor May 12 March 30 (1941) June 22 (1922)  1890-present
Defiance, OH  April 30 April 13 (2011) May 12 (2009) 1998-present
Fort Wayne April 23 April 1 (1922) May 27 (1961) 1912-present
Goshen, IN April 29
April 17 (2007) May 21 (2002) 1997-present
Lima, OH April 27 April 3 (2011) May 19 (2002) 1998-present
South Bend April 25
April 7 (1984) May 29 (1897) 1893-present

*Normals are computed for the 30 year period of 1981 to 2010.

The table below shows the normal last, earliest last, and latest date of temperatures at or below 28°F for the spring season at locations across the area.

Location Normal Last Date* Earliest Last Date Latest Date Record Period
Benton Harbor April 26 March 17 (1929) May 28 (1992)  1890-present
Defiance, OH  April 15 March 30 (1999) May 4 (2005) 1998-present
Fort Wayne April 11
March 10 (1929)  May 13 (1946) 1912-present
Goshen, IN April 20
March 27 (2010) May 4 (2010) 1997-present
Lima, OH  April 6
March 18 (2005) April 26 (2006) 1998-present
South Bend April 16
March 18 (1980) May 25 (1925) 1893-present

*Normals are computed for the 30 year period of 1981 to 2010.

 


Modified Growing Degree Days (GDD) - Season and Month To Date

***These maps will be updated with the start of growing season***

Modified Growing Degree Days are similar to Growing Degree Days with several temperature adjustments. If the daily maximum temperature is above 86°F, it is reset to 86°F. If the daily minimum temperature is below 50°F, it is reset to 50°F. Once the max/min temperatures have been modified (if needed), the average temperature for the day is computed and compared with a base temperature, which is usually 50°F for corn and soybeans. Modified Growing Degree Days are typically used to monitor the development of corn, the assumption being that development is limited once the temperature exceeds 86°F or falls below 50°F. For example, if the high for the day was 92°F and the low 68°F, the average for use in the Modified GDD calculation would be 86 + 68 = 154 / 2 = 77. Click on the maps below to go to the most recent versions of the data from Midwestern Regional Climate Center.

Season to Date

 This map shows the total growing degree days since start of the growing season.  The start of the season is defined as April 1.

Month to Date

This map shows the total growing degree days since start of the month.

   

Season Departure from Normal

Month Departure from Normal



 

Updated 4/18/2014
CEO



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