What are degree days?
Growing degree days (DD) are a weather-based indicator for assessing crop and pest development. It is a calculation used by crop producers that measures heat accumulation used to predict plant and pest development rates. Growing degrees are defined as the mean daily temperature (average of daily maximum and minimum temperatures) above a certain threshold base temperature accumulated on a daily basis over a period of time. Daily growing degree day values are added together from the beginning of the season. Degree day totals are also used for comparing the progress of a growing season to the long-term average.
Degree Day Development Table
The codling moth, like all insects, is cold blooded. Meaning, the temperature around it determines how fast it grows and how active it is as an adult moth. We can take advantage of this to predict what life stage the majority of the codling moths population are in. Scientists have developed a model that uses degree–days to predict codling moth development. These predictions are summarized in this table.
Degree day total (+/- 3-5 DD) | Codling moth stage of development |
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100 | Emergence of 1st brood moths from overwintering larvae |
150 | Beginning of 1st brood egg laying |
220 | Start of 1st egg hatch (first brood larvae) |
500 | End of emergence of 1st brood moths |
575 | Start of emergence of 2nd brood moths |
650 | End of 1st brood egg hatch |
700 | Start of 2nd brood egg hatch (2nd brood larvae) |
1140 | End of 2nd brood moth emergence |
1160 | Start of 3rd brood moth emergence |
1275 | End of 2nd brood egg hatch |
1300 | Start of 3rd brood egg hatch |
A complete codling moth degree day development table is also available as a PDF – Full Codling Moth Degree Day Development Table.
More information about the codling moth stages of development, see Codling Moth.
Degree Day Tables
The degree day totals in the table below indicate the predicted stage of development of codling moth populations near specific weather stations located around the valley. Growers and advisors can use the values to determine the life stages of the codling moth in their area. This will help determine the proper time to apply ovicidal and larvicidal products to control each of the codling moth generations if needed.
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2020 Degree Days-South
Weather Station Osoyoos Oliver South Oliver Central Cawston Keremeos Penticton Airport Summerland North September 16, 2020 1474 1383 1385 1434 1495 1193 1133 September 14, 2020 1452 1362 1364 1415 1479 1174 1112 September 11, 2020 1425 1337 1336 1383 1456 1154 1094 September 9, 2020 1406 1321 1317 1367 1430 1131 1077 September 4, 2020 1351 1270 1262 1304 1363 1091 1034 September 2, 2020 1328 1248 1239 1276 1332 1075 1014 August 31, 2020 1308 1230 1221 1256 1311 1057 1000 August 28, 2020 1278 1203 1192 1225 1281 1031 979 August 26, 2020 1252 1178 1166 1207 1263 1010 961 August 24, 2020 1233 1162 1149 1184 1239 994 946 August 21, 2020 1194 1126 1110 1146 1200 962 916 August 19, 2020 1170 1105 1086 1118 1173 938 893 August 17, 2020 1140 1079 1057 1088 1142 913 868 August 14, 2020 1088 1032 1006 1035 1087 862 825 August 10, 2020 1054 1002 973 1001 1052 832 800 July 29, 2020 889 851 811 831 878 679 655 July 27, 2020 861 825 783 802 847 653 631 July 24, 2020 813 782 739 760 801 616 591 July 22, 2020 787 758 713 734 774 592 569 July 20, 2020 758 731 688 706 744 567 547 July 17, 2020 713 689 648 661 698 531 512 July 10, 2020 643 625 584 589 622 475 461 July 6, 2020 603 585 547 550 578 441 429 July 2, 2020 565 552 516 519 545 413 403 June 29, 2020 538 526 491 496 523 389 384 June 26, 2020 501 491 456 463 486 361 356 June 22, 2020 449 442 408 413 437 319 316 June 19, 2020 413 407 375 377 399 291 289 June 17, 2020 398 392 361 362 384 279 274 June 15, 2020 384 377 347 349 370 267 262 June 12, 2020 369 362 334 337 359 260 256 June 8,2020 341 337 309 314 334 238 236 June 5, 2020 322 321 294 302 320 226 225 June 3, 2020 308 308 281 290 306 216 215 June 1, 2020 293 294 269 278 293 207 207 May 27, 2020 245 246 224 232 245 172 173 May 21, 2020 207 210 187 199 209 145 142 May 19, 2020 198 204 181 191 201 141 137 May 15, 2020 176 182 160 173 181 122 120 May 11, 2020 150 157 138 149 155 102 99 May 4, 2020 116 122 106 113 119 75 73 April 23, 2020 72 80 67 72 76 44 42 April 17, 2020 49 55 44 47 50 27 25 -
2020 Degree Days-Central
Weather Station West Kelowna Kelowna South Kelowna East Benvoulin Belgo Glenmore Ellison September 16, 2020 1236 1272 1263 1117 1247 1159 1187 September 14, 2020 1218 1253 1244 1099 1229 1140 1169 September 11, 2020 1191 1225 1217 1080 1199 1117 1144 September 9, 2020 1175 1207 1199 1065 1179 1101 1124 September 4, 2020 1126 1154 1145 1027 1127 1059 1080 September 2, 2020 1101 1131 1122 1010 1104 1039 1060 August 31, 2020 1085 1113 1105 996 1088 1024 1044 August 28, 2020 1062 1089 1081 979 1065 1004 1023 August 26, 2020 1043 1069 1059 962 1045 986 1005 August 24, 2020 1029 1054 1045 951 1031 974 994 August 21, 2020 994 1017 1012 924 998 944 962 August 19, 2020 970 992 987 906 972 922 939 August 17, 2020 942 967 962 884 946 898 913 August 14, 2020 893 919 915 840 899 853 867 August 10, 2020 867 890 887 818 873 830 841 July 29, 2020 710 726 732 683 715 682 693 July 27, 2020 684 698 707 661 688 658 670 July 24, 2020 644 660 669 625 650 620 634 July 22, 2020 621 636 646 607 627 598 611 July 20, 2020 596 610 620 586 602 575 587 July 17, 2020 559 572 583 553 565 539 553 July 10, 2020 499 512 523 502 503 481 495 July 6, 2020 462 475 487 470 467 446 457 July 1, 2020 435 447 461 444 440 421 431 June 29, 2020 414 425 440 425 419 402 410 June 26, 2020 384 394 410 398 389 373 380 June 22, 2020 338 347 363 357 343 330 337 June 19, 2020 306 314 331 328 311 299 306 June 17, 2020 290 296 314 312 294 283 290 June 15, 2020 276 284 302 301 283 272 277 June 12, 2020 267 277 294 294 274 265 271 June 8, 2020 245 254 271 272 252 246 248 June 5, 2020 234 241 258 260 240 235 235 June 3, 2020 222 228 246 249 228 223 223 June 1, 2020 215 221 239 242 221 217 216 May 19, 2020 143 151 165 172 149 151 150 May 15, 2020 125 133 145 151 130 132 129 May 11, 2020 102 108 118 125 106 106 105 May 4, 2020 76 79 88 95 78 80 79 April 23, 2020 44 47 53 58 47 46 46 April 17, 2020 25 28 31 36 26 26 26 -
2020 Degree Days-North
Weather Stations Winfield North Winfield South Bella Vista Vernon North & BX Salmon Arm September 16, 2020 1172 1141 1227 1178 1069 September 14, 2020 1155 1124 1210 1162 1055 September 11, 2020 1130 1099 1179 1134 1037 September 9, 2020 1115 1083 1162 1117 1024 September 4, 2020 1069 1035 1107 1067 974 September 2, 2020 1048 1014 1084 1046 954 August 31, 2020 1034 999 1069 1032 939 August 28, 2020 1012 977 1046 1009 915 August 26, 2020 994 959 1029 990 898 August 24, 2020 982 946 1016 977 885 August 21, 2020 948 913 981 946 853 August 19, 2020 927 889 955 919 823 August 17, 2020 901 862 927 892 796 August 14, 2020 857 818 882 847 753 August 10, 2020 829 793 856 822 727 July 29, 2020 677 643 698 671 588 July 27, 2020 653 619 672 646 567 July 24, 2020 612 579 634 609 535 July 22, 2020 589 557 612 588 515 July 20, 2020 565 534 586 563 491 July 17, 2020 531 542 553 530 462 July 10, 2020 479 447 494 474 414 July 6, 2020 444 413 457 438 382 July 2, 2020 420 390 430 414 361 June 29, 2020 339 372 410 394 341 June 26, 2020 373 346 383 368 320 June 22, 2020 332 306 340 326 282 June 19, 2020 301 277 312 297 253 June 17, 2020 284 296 294 280 241 June 15, 2020 271 284 279 267 229 June 12, 2020 263 240 270 258 222 June 8, 2020 241 222 248 239 204 June 5, 2020 230 211 237 227 192 June 3, 2020 218 200 224 215 182 June 1, 2020 212 221 217 208 176 May 27, 2020 179 162 186 176 151 May 21, 2020 148 133 154 148 128 May 19, 2020 143 129 148 142 121 May 15, 2020 124 112 127 121 103 May 11, 2020 100 91 102 97 81 May 4, 2020 74 66 73 71 60 April 23, 2020 42 35 40 39 28 April 17, 2020 23 18 22 20 13 -
2019 Degree Days - South
Weather Station Location
Osoyoos Oliver South Oliver Central Cawston Keremeos Penticton Airport Summerland North September 12, 2019 1504 1451 1476 1444 1457 1294 1213 September 10, 2019 1488 1436 1462 1430 1444 1280 1201 September 5, 2019 1449 1397 1423 1394 1408 1244 1169 August 28, 2019 1374 1323 1350 1325 1342 1175 1109 August 26, 2019 1354 1303 1330 1306 1324 1155 1091 August 23, 2019 1323 1272 1299 1277 1296 1126 1064 August 21, 2019 1302 1251 1279 1257 1277 1106 1047 August 19, 2019 1279 1229 1256 1236 1256 1085 1027 August 16, 2019 1243 1193 1221 1202 1224 1050 996 August 14, 2019 1219 1169 1197 1179 1201 1027 975 August 12, 2019 1193 1144 1172 1155 1178 1003 953 August 8, 2019 1143 1093 1122 1108 1132 955 909 August 6, 2019 1107 1058 1087 1074 1099 920 877 August 2, 2019 1041 994 1023 1014 1042 859 820 July 31, 2019 1010 965 991 987 1013 833 794 July 29, 2019 981 940 965 960 986 812 774 July 24, 2019 914 879 900 892 915 754 721 July 22, 2019 890 857 878 870 894 733 703 July 19, 2019 857 827 848 836 859 702 678 July 17, 2019 834 805 827 815 836 684 661 July 11, 2019 754 735 750 742 764 619 597 July 9, 2019 731 715 731 723 743 600 579 July 4, 2019 675 662 679 670 690 553 537 July 2, 2019 652 641 657 647 666 533 520 June 26, 2019 596 589 604 596 614 483 476 June 24, 2019 580 574 589 580 598 466 463 June 21, 2019 551 544 561 552 570 439 441 June 19, 2019 539 535 550 541 558 433 435 June 17, 2019 518 514 529 523 539 413 415 June 12, 2019 450 452 466 455 466 352 362 June 7, 2019 406 408 423 408 415 319 327 June 5, 2019 398 401 417 404 408 312 317 June 3, 2019 375 385 396 388 390 298 300 May 29, 2019 316 328 337 326 332 243 246 May 27, 2019 295 308 315 301 309 227 228 May 24, 2019 273 288 296 283 289 209 211 May 16, 2019 217 234 242 231 236 161 160 May 13, 2019 200 215 224 213 217 146 145 May 10, 2019 172 187 195 179 182 122 131 May 8, 2019 156 170 178 161 163 107 106 May 6, 2019 139 153 161 144 145 94 87 May 3, 2019 117 131 138 123 122 80 78
Data from Oliver south, Oliver north, Cawston, and Keremeos comes from Growers Supply's weather network. -
2019 Degree Days - Central
Weather Station Location West Kelowna Kelowna South Kelowna East Benvoulin Belgo Glenmore Ellison 12-Sep 2019 1272 1304 1320 1237 1245 1221 1246 10-Sep-19 1259 1291 1308 1224 1233 1209 1234 05-Sep-19 1227 1258 1276 1190 1204 1179 1203 28-Aug-2019 1166 1195 1213 1125 1148 1120 1144 26-Aug-2019 1147 1176 1195 1106 1131 1102 1127 23-Aug-2019 1121 1149 1168 1077 1106 1077 1101 21-Aug-2019 1103 1130 1150 1058 1090 1059 1083 19-Aug-2019 1083 1110 1130 1038 1071 1040 1064 16-Aug-2019 1052 1078 1098 1005 1042 1010 1034 14-Aug-2019 1030 1056 1077 982 1022 989 1013 12-Aug-2019 1008 1033 1054 959 1001 967 991 08-Aug-2019 963 988 1009 912 960 924 948 06-Aug-2019 931 955 976 879 927 891 915 02-Aug-2019 874 897 918 820 869 835 858 31-Jul-2019 844 867 889 797 841 808 828 29-Jul-2019 823 845 867 779 820 788 807 24-Jul-2019 768 789 810 732 766 738 756 22-Jul-2019 747 767 789 715 744 719 736 19-Jul-2019 N/A 741 762 691 719 696 709 17-Jul-2019 703 722 745 674 700 678 690 11-Jul-2019 633 652 675 607 633 610 620 09-Jul-2019 612 630 654 587 612 590 599 04-Jul-2019 569 584 610 546 568 548 554 02-Jul-2019 550 563 590 529 549 531 536 26-Jun-2019 504 517 541 487 504 486 489 24-Jun-2019 489 503 526 473 490 472 474 21-Jun-2019 465 476 502 449 464 448 448 19-Jun-2019 459 471 497 444 461 443 444 17-Jun-2019 435 448 474 426 439 423 423 12-Jun-2019 374 386 412 375 377 363 365 07-Jun-2019 340 352 376 342 344 329 328 05-Jun-2019 328 339 364 334 334 318 318 03-Jun-2019 310 323 345 319 318 302 302 27-May-2019 232 242 263 253 238 230 229 24-May-2019 216 227 246 238 224 214 214 16-May-2019 168 175 191 190 175 170 169 13-May-2019 152 160 176 178 160 157 156 10-May-2019 134 130 144 149 128 140 126 08-May-2019 108 113 128 134 114 115 114 06-May-2019 96 101 113 121 101 102 102 03-May-2019 84 87 99 107 88 90 89 -
2019 Degree Days - North
Weather Station
LocationWinfield North Winfield South Bella Vista Vernon North & BX Salmon Arm September 12, 2019 1206 1163 1254 1201 1084 September 10, 2019 1195 1152 1243 1190 1073 September 5, 2019 1165 1258 1215 1163 1045 August 28, 2019 1106 1195 1159 1110 990 August 26, 2019 1089 1050 1143 1094 973 August 23, 2019 1064 1149 1119 1071 949 August 21, 2019 1046 1130 1102 1056 933 August 19, 2019 1027 991 1084 1038 915 August 16, 2019 997 1078 1055 1011 886 August 14, 2019 977 942 1036 992 867 August 12, 2019 955 921 1015 972 846 August 8, 2019 912 879 973 932 805 August 6, 2019 880 955 942 901 775 August 2, 2019 826 793 893 850 726 July 31, 2019 799 867 863 821 701 July 29, 2019 778 845 840 800 683 July 24, 2019 728 697 785 748 639 July 22, 2019 708 767 765 728 618 July 19, 2019 684 655 741 703 595 July 17, 2019 667 722 724 686 579 July 11, 2019 600 652 656 626 523 July 9, 2019 580 557 633 605 504 July 4, 2019 536 515 588 559 462 July 2, 2019 520 499 572 544 446 June 26, 2019 474 456 521 500 405 June 24, 2019 461 445 506 484 391 June 21, 2019 435 421 481 462 375 June 19, 2019 431 418 474 456 370 June 17, 2019 411 448 450 435 350 June 12, 2019 351 337 385 375 296 June 7, 2019 315 304 345 340 265 June 5, 2019 404 294 331 328 257 June 3, 2019 290 280 312 311 241 May 29, 2019 236 224 253 252 192 May 27, 2019 216 242 234 231 176 May 24, 2019 201 191 214 211 158 May 16, 2019 154 149 161 163 119 May 13, 2019 140 135 143 147 105 May 10, 2019 120 114 125 130 92 May 8, 2019 95 91 98 103 66 May 6, 2019 84 79 85 90 56 May 3, 2019 73 69 72 78 46
Data from Oyama, Winfield South, OK Landing & Bella Vista, and Vernon North & BX comes from Growers Supply's weather network.