Degree Days

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 degreedays to predict codling moth development. These predictions are summarized in this table.

Degree day total
(+/- 3-5 DD)
Codling moth stage of development
100Emergence of 1st brood moths from overwintering larvae
150Beginning of 1st brood egg laying
220Start of 1st egg hatch (first brood larvae)
500End of emergence of 1st brood moths
575Start of emergence of 2nd brood moths
650End of 1st brood egg hatch
700Start of 2nd brood egg hatch (2nd brood larvae)
1140End of 2nd brood moth emergence
1160Start of 3rd brood moth emergence
1275End of 2nd brood egg hatch
1300Start 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.

  • 2020 Degree Days-South
    Weather StationOsoyoosOliver South Oliver CentralCawstonKeremeosPenticton AirportSummerland North
    September 16, 20201474138313851434149511931133
    September 14, 20201452136213641415147911741112
    September 11, 20201425133713361383145611541094
    September 9, 20201406132113171367143011311077
    September 4, 20201351127012621304136310911034
    September 2, 20201328124812391276133210751014
    August 31, 20201308123012211256131110571000
    August 28, 2020127812031192122512811031979
    August 26, 2020125211781166120712631010961
    August 24, 202012331162114911841239994946
    August 21, 202011941126111011461200962916
    August 19, 202011701105108611181173938893
    August 17, 202011401079105710881142913868
    August 14, 202010881032100610351087862825
    August 10, 20201054100297310011052832800
    July 29, 2020889851811831878679655
    July 27, 2020861825783802847653631
    July 24, 2020813782739760801616591
    July 22, 2020787758713734774592569
    July 20, 2020758731688706744567547
    July 17, 2020713689648661698531512
    July 10, 2020643625584589622475461
    July 6, 2020603585547550578441429
    July 2, 2020565552516519545413403
    June 29, 2020538526491496523389384
    June 26, 2020501491456463486361356
    June 22, 2020449442408413437319316
    June 19, 2020413407375377399291289
    June 17, 2020398392361362384279274
    June 15, 2020384377347349370267262
    June 12, 2020369362334337359260256
    June 8,2020341337309314334238236
    June 5, 2020322321294302320226225
    June 3, 2020308308281290306216215
    June 1, 2020293294269278293207207
    May 27, 2020245246224232245172173
    May 21, 2020207210187199209145142
    May 19, 2020198204181191201141137
    May 15, 2020176182160173181122120
    May 11, 202015015713814915510299
    May 4, 20201161221061131197573
    April 23, 202072806772764442
    April 17, 202049554447502725
  • 2020 Degree Days-Central
    Weather StationWest KelownaKelowna SouthKelowna EastBenvoulinBelgoGlenmoreEllison
    September 16, 20201236127212631117124711591187
    September 14, 20201218125312441099122911401169
    September 11, 20201191122512171080119911171144
    September 9, 20201175120711991065117911011124
    September 4, 20201126115411451027112710591080
    September 2, 20201101113111221010110410391060
    August 31, 2020108511131105996108810241044
    August 28, 2020106210891081979106510041023
    August 26, 202010431069105996210459861005
    August 24, 20201029105410459511031974994
    August 21, 202099410171012924998944962
    August 19, 2020970992987906972922939
    August 17, 2020942967962884946898913
    August 14, 2020893919915840899853867
    August 10, 2020867890887818873830841
    July 29, 2020710726732683715682693
    July 27, 2020684698707661688658670
    July 24, 2020644660669625650620634
    July 22, 2020621636646607627598611
    July 20, 2020596610620586602575587
    July 17, 2020559572583553565539553
    July 10, 2020499512523502503481495
    July 6, 2020462475487470467446457
    July 1, 2020435447461444440421431
    June 29, 2020414425440425419402410
    June 26, 2020384394410398389373380
    June 22, 2020338347363357343330337
    June 19, 2020306314331328311299306
    June 17, 2020290296314312294283290
    June 15, 2020276284302301283272277
    June 12, 2020267277294294274265271
    June 8, 2020245254271272252246248
    June 5, 2020234241258260240235235
    June 3, 2020222228246249228223223
    June 1, 2020215221239242221217216
    May 19, 2020143151165172149151150
    May 15, 2020125133145151130132129
    May 11, 2020102108118125106106105
    May 4, 202076798895788079
    April 23, 202044475358474646
    April 17, 202025283136262626
  • 2020 Degree Days-North
    Weather StationsWinfield NorthWinfield SouthBella VistaVernon North & BXSalmon Arm
    September 16, 202011721141122711781069
    September 14, 202011551124121011621055
    September 11, 202011301099117911341037
    September 9, 202011151083116211171024
    September 4, 20201069103511071067974
    September 2, 20201048101410841046954
    August 31, 2020103499910691032939
    August 28, 2020101297710461009915
    August 26, 20209949591029990898
    August 24, 20209829461016977885
    August 21, 2020948913981946853
    August 19, 2020927889955919823
    August 17, 2020901862927892796
    August 14, 2020857818882847753
    August 10, 2020829793856822727
    July 29, 2020677643698671588
    July 27, 2020653619672646567
    July 24, 2020612579634609535
    July 22, 2020589557612588515
    July 20, 2020565534586563491
    July 17, 2020531542553530462
    July 10, 2020479447494474414
    July 6, 2020444413457438382
    July 2, 2020420390430414361
    June 29, 2020339372410394341
    June 26, 2020373346383368320
    June 22, 2020332306340326282
    June 19, 2020301277312297253
    June 17, 2020284296294280241
    June 15, 2020271284279267229
    June 12, 2020263240270258222
    June 8, 2020241222248239204
    June 5, 2020230211237227192
    June 3, 2020218200224215182
    June 1, 2020212221217208176
    May 27, 2020179162186176151
    May 21, 2020148133154148128
    May 19, 2020143129148142121
    May 15, 2020124112127121103
    May 11, 2020100911029781
    May 4, 20207466737160
    April 23, 20204235403928
    April 17, 20202318222013
  • 2019 Degree Days - South
    Weather Station Location
    Osoyoos Oliver SouthOliver CentralCawstonKeremeosPenticton AirportSummerland North
    September 12, 20191504145114761444145712941213
    September 10, 20191488143614621430144412801201
    September 5, 20191449139714231394140812441169
    August 28, 20191374132313501325134211751109
    August 26, 20191354130313301306132411551091
    August 23, 20191323127212991277129611261064
    August 21, 20191302125112791257127711061047
    August 19, 20191279122912561236125610851027
    August 16, 2019124311931221120212241050996
    August 14, 2019121911691197117912011027975
    August 12, 2019119311441172115511781003953
    August 8, 201911431093112211081132955909
    August 6, 201911071058108710741099920877
    August 2, 20191041994102310141042859820
    July 31, 201910109659919871013833794
    July 29, 2019981940965960986812774
    July 24, 2019914879900892915754721
    July 22, 2019890857878870894733703
    July 19, 2019857827848836859702678
    July 17, 2019834805827815836684661
    July 11, 2019754735750742764619597
    July 9, 2019731715731723743600579
    July 4, 2019675662679670690553537
    July 2, 2019652641657647666533520
    June 26, 2019596589604596614483476
    June 24, 2019580574589580598466463
    June 21, 2019551544561552570439441
    June 19, 2019539535550541558433435
    June 17, 2019518514529523539413415
    June 12, 2019450452466455466352362
    June 7, 2019406408423408415319327
    June 5, 2019398401417404408312317
    June 3, 2019375385396388390298300
    May 29, 2019316328337326332243246
    May 27, 2019295308315301309227228
    May 24, 2019273288296283289209211
    May 16, 2019217234242231236161160
    May 13, 2019200215224213217146145
    May 10, 2019172187195179182122131
    May 8, 2019156170178161163107106
    May 6, 20191391531611441459487
    May 3, 20191171311381231228078
    Data from Osoyoos, Penticton and Summerland comes from Environment Canada.
    Data from Oliver south, Oliver north, Cawston, and Keremeos comes from Growers Supply's weather network.
  • 2019 Degree Days - Central
    Weather Station LocationWest KelownaKelowna SouthKelowna EastBenvoulinBelgoGlenmoreEllison
    12-Sep 20191272130413201237124512211246
    10-Sep-191259129113081224123312091234
    05-Sep-191227125812761190120411791203
    28-Aug-20191166119512131125114811201144
    26-Aug-20191147117611951106113111021127
    23-Aug-20191121114911681077110610771101
    21-Aug-20191103113011501058109010591083
    19-Aug-20191083111011301038107110401064
    16-Aug-20191052107810981005104210101034
    14-Aug-201910301056107798210229891013
    12-Aug-20191008103310549591001967991
    08-Aug-20199639881009912960924948
    06-Aug-2019931955976879927891915
    02-Aug-2019874897918820869835858
    31-Jul-2019844867889797841808828
    29-Jul-2019823845867779820788807
    24-Jul-2019768789810732766738756
    22-Jul-2019747767789715744719736
    19-Jul-2019N/A741762691719696709
    17-Jul-2019703722745674700678690
    11-Jul-2019633652675607633610620
    09-Jul-2019612630654587612590599
    04-Jul-2019569584610546568548554
    02-Jul-2019550563590529549531536
    26-Jun-2019504517541487504486489
    24-Jun-2019489503526473490472474
    21-Jun-2019465476502449464448448
    19-Jun-2019459471497444461443444
    17-Jun-2019435448474426439423423
    12-Jun-2019374386412375377363365
    07-Jun-2019340352376342344329328
    05-Jun-2019328339364334334318318
    03-Jun-2019310323345319318302302
    27-May-2019232242263253238230229
    24-May-2019216227246238224214214
    16-May-2019168175191190175170169
    13-May-2019152160176178160157156
    10-May-2019134130144149128140126
    08-May-2019108113128134114115114
    06-May-201996101113121101102102
    03-May-2019848799107889089
  • 2019 Degree Days - North
    Weather Station
    Location
    Winfield NorthWinfield SouthBella VistaVernon North & BX Salmon Arm
    September 12, 201912061163125412011084
    September 10, 201911951152124311901073
    September 5, 201911651258121511631045
    August 28, 20191106119511591110990
    August 26, 20191089105011431094973
    August 23, 20191064114911191071949
    August 21, 20191046113011021056933
    August 19, 2019102799110841038915
    August 16, 2019997107810551011886
    August 14, 20199779421036992867
    August 12, 20199559211015972846
    August 8, 2019912879973932805
    August 6, 2019880955942901775
    August 2, 2019826793893850726
    July 31, 2019799867863821701
    July 29, 2019778845840800683
    July 24, 2019728697785748639
    July 22, 2019708767765728618
    July 19, 2019684655741703595
    July 17, 2019667722724686579
    July 11, 2019600652656626523
    July 9, 2019580557633605504
    July 4, 2019536515588559462
    July 2, 2019520499572544446
    June 26, 2019474456521500405
    June 24, 2019461445506484391
    June 21, 2019435421481462375
    June 19, 2019431418474456370
    June 17, 2019411448450435350
    June 12, 2019351337385375296
    June 7, 2019315304345340265
    June 5, 2019404294331328257
    June 3, 2019290280312311241
    May 29, 2019236224253252192
    May 27, 2019216242234231176
    May 24, 2019201191214211158
    May 16, 2019154149161163119
    May 13, 2019140135143147105
    May 10, 201912011412513092
    May 8, 201995919810366
    May 6, 20198479859056
    May 3, 20197369727846
    Data from Salmon Arm comes from Environment Canada.
    Data from Oyama, Winfield South, OK Landing & Bella Vista, and Vernon North & BX comes from Growers Supply's weather network.