Cranberry Growing Degree-Days

The maps below show the degree day accumulations with weather data taken from 46 weather stations across Wisconsin. Currently, there will be a time lag between the creation and posting of each map and the present date. We are working on getting this information as timely as possible. Note: cranberry growing degree-days are calculated with base threshold 41 deg F, and upper threshold 85 deg F. Sparganothis degree-days are calculated with base threshold 50 deg F and upper threshold 86 deg F. And cranberry fruitworm degree-days are calculated with a base threshold 44 deg F and upper threshold of 87 deg F.

Click here for interactive maps.

To determine which Sparganothis life stage correlates with the current degree-day, refer to the six benchmarks for Sparganothis.

Six benchmarks for Sparganothis

 

Additionally, in collaboration with a citizen science group of Wisconsin cranberry growers, we are working on correlating growing degree days (DD) with cranberry phenology. Citizen science means that data is collected according to a standardized protocol by means of public participation. Daily high and low temperatures collected at the cranberry plant canopy are used to calculate growing degree days beginning on March 1. The mean cranberry growing degree days (provided by growers located in Juneau, Wood and Monroe Counties) will be updated weekly. If you have any questions, please contact Elissa at elissa.chasen@ars.usda.gov.

Date 2015 Plant DD 2016 Plant DD 2017 Plant DD 2017 Sparg DD
upper and 
lower 
thresholds
41°F, 85°F
41°F, 85°F
41°F, 85°F
50°F, 86°F
March 7 0.7 18.3 18.7  5.2
March 14 46.5 78.7  19.5  5.2
March 21 76.1 99.4 35.4  9.1
March 28 77.6 120.7 49.3 13.0
April 4 130.8  150.9 87.6 26.1
April 11 154.0 163.6 154.4 56.4
April 18 258.1  277.2 245.4 97.5
April 25 295.5 389.2 333.4 141.6
May 2 405.5 438.8  365.1 151.7
 May 9 563.3  559.0 451.0 195.3
  May 16  678.3  636.0 605.7 293.4
May 23  790.6 777.0 699.6 335.0
May 30 955.0 982.2 835.8 409.8
June 6 1,100  1,162 1,006 524.5
June 13 1,283 1,349 1,227 684.4
June 20 1,474 1,555 1,414 809.6
June 27 1,669 1,753 1,529 854.9
July 4  1,837 1,927
July 11 2,021  2,145
July 18 2,233 2,354
July 25 2,439 2,585
August 1 2,658  2,786
August 8 2,854  2,999
August 15 3,070  3,226
August 22 3,257  3,429
August 29 3,389  3,619
Sept. 5 3,618  3,796
Sept. 12 3,775
Sept. 19
Sept. 26