Annual Degree Days

Yearly Comparisons:

Designing a correctly sized heating or cooling system for a home, or determining the proper amount of insulation requires having some idea of the local weather severity. One measure of weather severity commonly used is degree days. Degree days are the sum of the daily temperature variances from a 65°F base temperature, for an entire heating or cooling season. Heating degree days are accrued whenever the average outside temperature is below 65°F. Cooling degree days are accrued on days when the average outside temperature is over 65°F. The information below was gathered from the Rapid City Regional Airport.

2011

Month Heating Degree Days Average Cooling Degree Days Average Heating Degree Days Actual % Diff. from Average % Diff. from Last Yr. Cooling Degree Days Actual % Diff. From Average % Diff. From Last Yr. Heating 12-Month Ended Total Cooling 12-Month Ended Total
JAN 1314 0 1394 6.1% 3.7% 0 #N/A #N/A 7,322 532
FEB 1061 0 1276 20.3% 2.6% 0 #N/A #N/A 7,354 532
MAR 925 0 1037 12.1% 29.0% 0 #N/A #N/A 7,587 532
APR 595 2 643 8.1% 12.8% 0 -100% #N/A 7,660 532
MAY 313 13 440 40.6% 4.0% 0 -100% -100% 7,677 519
JUN 88 86 107 21.6% 12.6% 56 -34.9% 33.3% 7,689 523
JUL 16 227 0 -100% -100% 315 38.8% 166.9% 7,672 646
AUG 21 208 2 -90.5% -71.4% 260 25.0% 111.4% 7,667 661
SEP 190 59 151 -20.5% -7.9% 45 -23.7% -27.4% 7,654 687
OCT 521 3 458 -12.1% 25.8% 24 700.00% 118.2% 7,748 699
NOV 934 0 931 -0.3% -5.9% 0 #N/A #N/A 7,690 699
DEC 1233 0 1140 -7.5% -8.9% 0 #N/A #N/A 7,579 699
TOTAL 7211 598 7579     699        

2010

Month Heating Degree Days Average Cooling Degree Days Average Heating Degree Days Actual % Diff. from Average % Diff. from Last Yr. Cooling Degree Days Actual % Diff. From Average % Diff. From Last Yr. Heating 12-Month Ended Total Cooling 12-Month Ended Total
JAN 1314 0 1344 2.3% 8.5% 0 #N/A #N/A 7,858 354
FEB 1061 0 1244 17.2% 22.0% 0 #N/A #N/A 8,082 354
MAR 925 0 804 -13.1% -19.2% 0 #N/A #N/A 7,891 354
APR 595 2 570 -4.2% -23.5% 0 -100% #N/A 7,716 354
MAY 313 13 423 35.1% 24.4% 13 0.0% 44.4% 7,799 358
JUN 88 86 95 8.0% -49.5% 52 -39.5% 23.8% 7,706 368
JUL 16 227 17 6.3% 21.4% 192 -15.4% 62.7% 7,709 442
AUG 21 208 7 -66.7% -81.1% 245 17.8% 99.2% 7,679 564
SEP 190 59 164 -13.7% 29.1% 19 -67.8% -69.4% 7,716 521
OCT 521 3 364 -30.1% 55.0% 11 266.7% #N/A 7,271 532
NOV 934 0 989 5.9% 35.3% 0 #N/A #N/A 7,529 532
DEC 1233 0 1251 1.5% -17.0% 0 #N/A #N/A 7,272 532
TOTAL 7211 598 7272     532        

2009

Month Heating Degree Days Average Cooling Degree Days Average Heating Degree Days Actual % Diff. from Average % Diff. from Last Yr. Cooling Degree Days Actual % Diff. From Average % Diff. From Last Yr. Heating 12-Month Ended Total Cooling 12-Month Ended Total
JAN 1314 0 1239 -5.7% -7.7% 0 #N/A #N/A 7,572 482
FEB 1061 0 965 -9.0% -14.0% 0 #N/A #N/A 7,415 482
MAR 925 0 995 7.6% 11% 0 #N/A #N/A 7,569 482
APR 595 2 745 25.2% 8.3% 0 -100% #N/A 7,626 482
MAY 313 13 340 8.6% -20.4% 9 -30.8% #N/A 7,539 491
JUN 88 86 188 113.6% 63.5% 42 -51.2% 44.8% 7,612 504
JUL 16 227 14 -12.5% 55.6% 118 -48.0% -46.6% 7,617 401
AUG 21 208 37 76.2% 146.7% 123 -40.9% -40.3% 7,639 318
SEP 190 59 127 -33.2% -36.2% 62 5.1% 138.5% 7,567 354
OCT 521 3 809 55.3% 46.0% 0 -100.0% #N/A 7,822 354
NOV 934 0 731 -21.7% -14.3% 0 #N/A #N/A 7,700 354
DEC 1233 0                
TOTAL 7211 598 6245 - - 354 - - - -

2008

Month Heating Degree Days Average Cooling Degree Days Average Heating Degree Days Actual % Diff. from Average % Diff. from Last Yr. Cooling Degree Days Actual % Diff. From Average % Diff. From Last Yr. Heating 12-Month Ended Total Cooling 12-Month Ended Total
JAN 1314 0 1343 2.2% 12.1% 0 #N/A #N/A 6,772 1033
FEB 1061 0 1122 5.7% -8.1% 0 #N/A #N/A 6,673 1033
MAR 925 0 896 -3.1% 40.9% 0 #N/A #N/A 6,933 1033
APR 595 2 688 15.6% 9.7% 0 -100.0% #N/A 6,994 1033
MAY 313 13 427 36.4% 115.7% 0 -100.0% -100.0% 7,223 1000
JUN 88 86 115 30.7% 259.4% 29 -66.3% -82.9% 7,306 859
JUL 16 227 9 -43.8% #N/A 221 -2.6% -52.4% 7,315 616
AUG 21 208 15 -28.6% -40.0% 206 -1.0% -21.7% 7,305 559
SEP 190 59 199 4.7% 36.3% 26 -55.9% -74.8% 7,358 482
OCT 521 3 554 6.3% 29.1% 0 -100.0% #N/A 7,483 482
NOV 934 0 853 -8.7% 7.0% 0 #N/A #N/A 7,539 482
DEC 1233 0 1455 18.0% 10.4% 0 #N/A #N/A 7,676 482
TOTAL 7211 598 7676 - - 482 - - - -

2007

Month Heating Degree Days Average Cooling Degree Days Average Heating Degree Days Actual % Diff. from Average % Diff. from Last Yr. Cooling Degree Days Actual % Diff. From Average % Diff. From Last Yr. Heating 12-Month Ended Total Cooling 12-Month Ended Total
JAN 1314 0 1198 -8.8% 36.1% 0 #N/A #N/A 6,790 933
FEB 1061 0 1221 15.1% 13.5% 0 #N/A #N/A 6,935 933
MAR 925 0 636 -31.2% -35.8% 0 #N/A #N/A 6,581 933
APR 595 2 627 5.4% 41.2% 0 -100.0% 0.0% 6,764 932
MAY 313 13 198 -36.7% -23.3% 33 153.8% -19.5% 6,704 924
JUN 88 86 32 -63.6% 300.0% 170 97.7% 0.6% 6,728 925
JUL 16 227 0 -100.0% #N/A 464 104.4% 2.7% 6,728 937
AUG 21 208 25 19.0% 56.3% 263 0.0% 12.4% 6,737 966
SEP 190 59 146 -23.2% -37.6% 103 77.6% 243.3% 6,649 1039
OCT 521 3 429 -17.7% -30.7% 0 #N/A -100.0% 6,459 1033
NOV 934 0 797 -14.7% -5.9% 0 #N/A #N/A 6,409 1033
DEC 1233 0 1318 6.9% 19.8% 0 #N/A #N/A 6,627 1,033
TOTAL 7211 598 6627 - - 1033 - - - -

2006

Month Heating Degree Days Average Cooling Degree Days Average Heating Degree Days Actual % Diff. from Average % Diff. from Last Yr. Cooling Degree Days Actual % Diff. From Average % Diff. From Last Yr. Heating 12-Month Ended Total Cooling 12-Month Ended Total
JAN 1314 0 880 -33.0% -32.4% 0 #N/A #N/A 6,066 830
FEB 1061 0 1076 1.4% 20.2% 0 #N/A #N/A 6,247 830
MAR 925 0 990 7.0% 24.8% 0 #N/A #N/A 6,444 830
APR 595 2 444 -25.4% -12.9% 1  -50.0% -87.5% 6,378 823
MAY 313 13 258 -17.6% -27.1% 41 215.4% 272.7% 6,282 853
JUN 88 86 8 -90.9% -88.4% 169 96.5% 31.0% 6,221 893
JUL 16 227 0 -100.0% -100.0% 452 99.1%  27.0% 6,213 989
AUG 21 208 16 -23.8% 6.7% 234 12.5% 14.7% 6,214 1019
SEP 190 59 234 23.2% 141.2% 28 -52.5%  -75.2%  6,351 934
OCT 521 3 619 18.8% 32.3% 6 100.0%  -33.3%  6,502 931
NOV 934 0 847 -9.3% 12.0% 0 #N/A #N/A 6,303 931
DEC 1233 0 1100 -10.8% -11.0% 0 #N/A #N/A 6,472 931
TOTAL 7211 598 6472     931        

2005

Month Heating Degree Days Average Cooling Degree Days Average Heating Degree Days Actual % Diff. from Average % Diff. from Last Yr. Cooling Degree Days Actual % Diff. From Average % Diff. From Last Yr. Heating 12-Month Ended Total Cooling 12-Month Ended Total
JAN 1314 0 1302 -0.9% 0.4% 0 #N/A #N/A 6,558 522
FEB 1061 0 895 -15.6% -15.0% 0 #N/A #N/A 6,400 522
MAR 925 0 793 -14.3% 4.6% 0 #N/A #N/A 6,435 522
APR 595 2 510 -14.3% 0.8% 8 300.0% #N/A 6,439 530
MAY 313 13 354 13.1% 18.8% 11 -15.4% -35.3% 6,495 524
JUN 88 86 69 -21.6% -49.3% 129 50.0% 207.1% 6,428 611
JUL 16 227  8  -50.0%  -52.9%  356  56.8%  44.7% 6,419   721
AUG 21 208  15 -28.6%   -66.7%  204 -1.9% 37.8% 6,389  777
SEP 190 59 97   -48.9%  -28.7% 113  91.5%  63.8%  6,350 821 
OCT 521 3 468   -10.2% 3.1%  9  200.0%  #N/A  6,364 830 
NOV 934 0 758 -18.8% -7.8% 0 #N/A #N/A 6,300 830
DEC 1233 0 1219 -1.1% 18.2% 0 #N/A #N/A 6,488 830
TOTAL 7211 598 6488     830        

2004

Month Heating Degree Days Average Cooling Degree Days Average Heating Degree Days Actual % Diff. from Average % Diff. from Last Yr. Cooling Degree Days Actual % Diff. From Average % Diff. From Last Yr. Heating 12-Month Ended Total Cooling 12-Month Ended Total
JAN 1314 0 1297 -1.3% 8.3% 0 #N/A #N/A 7,164 891
FEB 1061 0 1053 -0.8% -13.1% 0 #N/A #N/A 7,005 891
MAR 925 0 758 -18.1% -18.0% 0 #N/A #N/A 6,839 891
APR  595  2  506  -15.0%  0.2%  0  -100.0%  #N/A  6,840  891
MAY 313 13  298 -4.8%  -7.2%  17   30.8% -15.0%   6,817  888
JUN 88 86 136 54.5% 1.5% 42 -51.2% -22.2% 6,819 876
JUL 16 227 17 6.3% #N/A 246 8.4% -35.4% 6,836 741
AUG 21 208 45 114.3% 164.7% 148 -28.8% -59.3% 6,864 525
SEP 190 59 136 -28.4% -38.2% 69 16.9% 6.2% 6,780 529
OCT 521 3 454 -12.9% 17.9% 0 -100.0% -100.0% 6,849 522
NOV 934 0 822 -12.0% -24.3% 0 #N/A #N/A 6,585 522
DEC 1233 0                
TOTAL 7211 598 5522     522        

2003

Month Heating Degree Days Average Cooling Degree Days Average Heating Degree Days Actual % Diff. from Average % Diff. from Last Yr. Cooling Degree Days Actual % Diff. From Average % Diff. From Last Yr. Heating 12-Month Ended Total Cooling 12-Month Ended Total
JAN 1314 0 1198 -8.8% 4.3% 0 #N/A #N/A 7,085 936
FEB 1061 0 1212 14.2% 27.2% 0 #N/A #N/A 7,344 936
MAR 925 0 924 -0.1% -29.8% 0 #N/A #N/A 6,952 936
APR 595 2 505 -15.1% 46.0% 0 -100.0% #N/A 7,111 936
MAY 313 13 321 2.6% -23.0% 20 53.8% 33.3% 7,015 941
JUN 88 86 134 52.3% 204.5% 54 -37.2% -72.0% 7,105 802
JUL 16 227 0 -100.0% #N/A 381 67.8% -6.8% 7,105 774
AUG 21 208 17  -19.0%  0.0%  364  75.0%  68.5%  7,105  922 
SEP 190 59 220  15.8%  16.4%  65  10.2%   -36.9% 7,136  884
OCT 521 3 385  -26.1%  -51.7%  7   133.3%  #N/A  6,724 891 
NOV 934 0 1086  16.3%   32.9% 0   #N/A #N/A  6,993  891 
DEC 1233 0 1063  -13.8%   7.3% 0   #N/A #N/A   7,065 891 
TOTAL 7211 598 7065     891        


2002

Month Heating Degree Days Average Cooling Degree Days Average Heating Degree Days Actual % Diff. from Average % Diff. from Last Yr. Cooling Degree Days Actual % Diff. From Average % Diff. From Last Yr. Heating 12-Month Ended Total Cooling 12-Month Ended Total
JAN 1324 0 1149 -13.2% 5.8% 0 #N/A #N/A 6,935 821
FEB 1072 0 953 -11.1% -28.6% 0 #N/A #N/A 6,554 821
MAR 958 0 1316 37.4% 39.4% 0 #N/A #N/A 6,926 821
APR 597 0 346 -42.0% -38.8% 0 #N/A -100.0% 6,707 817
MAY 311 7 417 34.1% 50.0% 15 114.3% 36.4% 6,846 821
JUN 103 97 44 -57.3% -65.4% 193 99.0% 80.4% 6,763 907
JUL 18 241 0 -100.0% -100.0% 409 69.7% 27.8% 6,754 996
AUG 31 205 17 -45.2% #N/A 216 5.4% -28.0% 6,771 912
SEP 211 61 189 -10.4% 26.8% 103 68.9% 32.1% 6,811 937
OCT 505 0 797 57.8% 52.4% 0 #N/A -100.0% 7,085 936
NOV 906 0 817 -9.8% 9.5% 0 #N/A #N/A 7,156 936
DEC 1265 0 991 -21.7% -10.8% 0 #N/A #N/A 7,036 936
TOTAL 7301 611 7036     936        


2001

Month Heating Degree Days Average Cooling Degree Days Average Heating Degree Days Actual % Diff. from Average % Diff. from Last Yr. Cooling Degree Days Actual % Diff. From Average % Diff. From Last Yr. Heating 12-Month Ended Total Cooling 12-Month Ended Total
JAN 1324 0 1086 -18.0% -9.2% 0 #N/A #N/A 7,129 766
FEB 1072 0 1334 24.4% 46.0% 0 #N/A #N/A 7,549 766
MAR 958 0 944 -1.5% 16.8% 0 #N/A #N/A 7,685 766
APR 597 0 565 -5.4% -13.3% 4 #N/A #N/A 7,598 770
MAY 311 7 278 -10.6% -1.1% 11 57.1% 10.0% 7,595 771
JUN 103 97 127 23.3% -8.6% 107 10.3% 59.7% 7,583 811
JUL 18 241 9 -50.0% -10.0% 320 32.8% 13.5% 7,582 849
AUG 31 205 0 -100.0% -100.0% 300 46.3% 0.3% 7,581 850
SEP 211 61 149 -29.4% -2.0% 78 27.9% -27.8% 7,578 820
OCT 505 0 523 3.6% 13.2% 1 #N/A #N/A 7,639 821
NOV 906 0 746 -17.7% -34.2% 0 #N/A #N/A 7,251 821
DEC 1265 0 1111 -12.2% -25.4% 0 #N/A #N/A 8,362 821
TOTAL 7301 611                


2000

Month Heating Degree Days Average Cooling Degree Days Average Heating Degree Days Actual % Diff. from Average % Diff. from Last Yr. Cooling Degree Days Actual % Diff. From Average % Diff. From Last Yr. Heating 12-Month Ended Total Cooling 12-Month Ended Total
JAN 1324 0 1196 -9.7% -1.5% 0 #N/A #N/A 6,364 488
FEB 1072 0 914 -14.7% 15.7% 0 #N/A #N/A 6,488 488
MAR 958 0 808 -15.7% -8.7% 0 #N/A #N/A 6,411 488
APR 597 0 652 9.2% -2.1% 0 #N/A #N/A 6,397 488
MAY 311 7 281 -9.6% -23.2% 10 42.9% 400.0% 6,312 496
JUN 103 97 139 35.0% 33.7% 67 -30.9% 67.5% 6,347 523
JUL 18 241 10 -44.4% -54.5% 282 17.0% 25.3% 6,335 580
AUG 31 205 1 -96.8% -83.3% 299 45.9% 41.0% 6,330 667
SEP 211 61 152 -28.0% -46.5% 108 77.0% 1100.0% 6,198 766
OCT 505 0 462 -8.5% 0.4% 0 #N/A #N/A 6,200 766
NOV 906 0 1134 25.2% 86.2% 0 #N/A #N/A 6,725 766
DEC 1265 0 1490 17.8% 52.7% 0 #N/A #N/A 7,239 766
TOTAL 7301 611                


1999

Month Heating Degree Days Average Cooling Degree Days Average Heating Degree Days Actual % Diff. from Average % Diff. from Last Yr. Cooling Degree Days Actual % Diff. From Average % Diff. From Last Yr. Heating 12-Month Ended Total Cooling 12-Month Ended Total
JAN 1324 0 1214 -8.3% -3.3% 0 #N/A #N/A 6,865 665
FEB 1072 0 790 -26.3% -5.6% 0 #N/A #N/A 6,818 665
MAR 958 0 885 -7.6% -23.1% 0 #N/A #N/A 6,552 665
APR 597 0 666 11.6% 19.4% 0 #N/A #N/A 6,660 665
MAY 311 7 366 17.7% 34.6% 2 -71.4% -75.0% 6,754 659
JUN 103 97 104 1.0% -47.5% 40 -58.8% 166.7% 6,660 684
JUL 18 241 22 22.2% 633.3% 225 -6.6% -10.0% 6,679 659
AUG 31 205 6 -80.6% #N/A 212 3.4% -8.6% 6,685 639
SEP 211 61 284 34.6% 212.1% 9 -85.2% -94.4% 6,878 488
OCT 505 0 460 -8.9% -11.9% 0 #N/A #N/A 6,816 488
NOV 906 0 609 -32.8% -27.5% 0 #N/A #N/A 6,585 488
DEC 1265 0 976 -22.8% -17.2% 0 #N/A #N/A 6,382 488
TOTAL 7301 611 6382 -12.6% -7.6% 488 -20.1% -26.6%    


1998

Month Heating Degree Days Average Cooling Degree Days Average Heating Degree Days Actual % Diff. from Average % Diff. from Last Yr. Cooling Degree Days Actual % Diff. From Average % Diff. From Last Yr. Heating 12-Month Ended Total Cooling 12-Month Ended Total
JAN 1324 0 1256 -5.1% -13.4% 0 #N/A #N/A 7,023 504
FEB 1072 0 837 -21.9% -17.0% 0 #N/A #N/A 6,852 504
MAR 958 0 1151 20.1% 32.0% 0 #N/A #N/A 7,131 504
APR 597 0 558 -6.5% -28.8% 0 #N/A #N/A 6,905 504
MAY 311 7 272 -12.5% -27.1% 8 14.3% 100.0% 6,804 508
JUN 103 97 198 92.2% 560.0% 15 -84.5% -80.3% 6,972 447
JUL 18 241 3 -83.3% -87.0% 250 3.7% 18.5% 6,952 486
AUG 31 205 0 -100.0% -100.0% 232 13.2% 56.8% 6,926 570
SEP 211 61 91 -56.9% -28.3% 160 162.3% 175.9% 6,890 672
OCT 505 0 522 3.4% 2.4% 0 #N/A -100.0% 6,902 665
NOV 906 0 840 -7.3% -11.3% 0 #N/A #N/A 6,795 665
DEC 1265 0 1179 -6.8% 10.5% 0 #N/A #N/A 7,974 665
TOTAL 7301 611 6907 -5.4% -4.3% 665 8.8% 31.9%    

 
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