Degree Day Summary

Description:

The degree day product summarizes degree days for a selected station over a range of dates. The range of dates currently can not exceed one year, but can cross a calendar year boundary (i.e. July 1 to June 30 is an acceptable range). The types of degree days available are: heating degree days, cooling degree days, growing degree days, 86/50 growing degree days, and Baskerville-Emin growing degree days. A base temperature is specified by the user for all but the 86/50 GDD, where 50 degrees is assumed. Logical defaults are provided. The user can ask to display all the daily values during the selected interval or just the summary statistics.

The results consist of the daily maximum temperature, minimum temperature and degree days for the day. In addition, three seasonal accumulations are provided. The first is the accumulation since the first day the user requested. The second is the accumulation since the beginning of the degree day season. For HDD, this is July 1; for CDD, January 1; for all GDD, March 1. If the specified date range crosses this day, the count for the "season" is reset on that day. The third accumulation begins a few months after the second accumulation. For HDD, this is October 1; for CDD, May 1; for all GDD, May 1. This count is also reset on the first day of the season. Between the first day of the season and the beginning of this third accumulation period, the accumulation will be displayed as dashes (-). An "m" following an accumulation indicates that there were one or more days of missing data in the accumulation period.


Price

The price for this product is $0.25/summary.

Sample

Degree Day Summary

Station: NEWARK UNIVERSITY FA State: DE ID: 076410
Latitude: 39.67 Longitude: -75.73 Elevation: 90 feet
Station period of record: 8/1/1948-current

CLIMOD Product: Degree Day Summary Creation Time: 10/09/2000 14:46 EDT
Element: Growing Degree Days Temperature Units: degrees Fahrenheit
Base Temperature: 50.0

 Date   Max Temp   Min Temp    GDD    Accumulation 
  since May 25 
 Accumulation 
  since Mar 1 
 Accumulation 
  since May 1 
5/25/2000 79 50 15 15 605 404
5/26/2000 82 54 18 33 623 422
5/27/2000 81 50 16 49 639 438
5/28/2000 80 52 16 65 655 454
5/29/2000 76 51 14 79 669 468
5/30/2000 77 41 9 88 678 477
5/31/2000 79 50 15 103 693 492
6/1/2000 87 54 21 124 714 513
6/2/2000 93 66 30 154 744 543
6/3/2000 92 64 28 182 772 571
6/4/2000 88 62 25 207 797 596
6/5/2000 72 50 11 218 808 607
6/6/2000 67 56 12 230 820 619
6/7/2000 76 52 14 244 834 633
6/8/2000 83 54 19 263 853 652
6/9/2000 89 62 26 289 879 678
6/10/2000 91 65 28 317 907 706
6/11/2000 94 69 32 349 939 738
6/12/2000 94 71 33 382 972 771

Flags:
  m = for daily value: missing value
  m = for accumulated value: missing one or more days in accumulation period

Notes:
  - Average temperatures are rounded away from zero prior to computing degree days.

For additional assistance, you can contact the HPRCC.