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Cumulative Chilling Hours

Traditional chilling hour accumulations are provided from November 1 through February 28/29 - the usual dormant season for California's tree fruit and nut crops. Hourly temperatures are downloaded nightly for more than 100 CIMIS weather stations.

The table below reflects accumulated chilling hours using two traditional calculation methods: hours below 45°F; and hours between 32°F and 45°F.

  • To retrieve daily and historical chilling units, select a station name, below. Then specify calculation method and dates on the following pages.
  • If you need information about the location of a station, select a county name. A county map will be displayed, showing this symbol  red circle to designate a CIMIS weather station.

Cumulative Chilling Hours 
Only historical data available until the day after season starts on Nov. 1

Link to county names:   A B C E F G I K L M N O P R S T V Y

County
Name
Station
Number
Station
Name
Hours
 < 45°F
   Hours  >32°
    and <45°F
 
Alameda 191 Pleasanton 1113 953
  171 Union City 953 881
 
Amador 227 Plymouth 1129 1019
 
Butte 012 Durham 1162 949
 
Colusa 032 Colusa 1095 889
 
Contra Costa 047 Brentwood 921 814
  170 Concord 1080 944
  213 El Cerrito 250 245
  178 Moraga 1226 951
 
El Dorado 013 Camino 813 703
  228 Diamond Springs 592 507
 
Fresno 205 Coalinga 766 678
  007 Firebaugh/Telles 1021 876
  190 Five Points South West 1025 803
  002 FivePoints/WSFS USDA 1164 934
  080 Fresno State 996 881
  142 Orange Cove 1080 946
  124 Panoche 1017 868
  039 Parlier 989 871
  105 Westlands 1065 819
 
Imperial 041 Calipatria/Mulberry 629 595
  087 Meloland 346 346
  175 Palo Verde II 818 753
  128 Salton Sea East
  127 Salton Sea West
  068 Seeley 386 386
  201 UC-Andrade 299 299
  186 UC-San Luis 440 438
  181 Westmorland North 656 647
 
Inyo 035 Bishop 1769 765
  183 Owens Lake North 1675 1227
  189 Owens Lake South 1788 916
 
Kern 125 Arvin-Edison 916 816
  146 Belridge 983 822
  054 Blackwells Corner 925 819
  138 Famoso 1014 906
  005 Shafter/USDA 1432 1078
 
Kings 021 Kettleman 477 436
  015 Stratford 1053 860
 
Lassen 057 Buntingville 2239 766
 
Los Angeles 216 Arleta 195 191
  215 Chatsworth 154 154
  133 Glendale 236 234
  174 Long Beach 361 361
  159 Monrovia 185 185
  197 Palmdale 1435 1004
  220 Palmdale Central 1130 945
  078 Pomona 286 284
  204 Santa Clarita 282 271
  099 Santa Monica 29 29
  219 West Hills 247 242
 
Madera 145 Madera
  188 Madera II 1300 1033
 
Marin 187 Black Point 1154 888
  157 Point San Pedro 977 905
 
Mendocino 085 Hopland FS 931 826
  106 Sanel Valley 1403 872
 
Merced 092 Kesterson 1149 797
  056 Los Banos 1157 892
  148 Merced 1361 944
 
Modoc 090 Alturas 2399 930
 
Monterey 114 Arroyo Seco 978 892
  210 Carmel 820 765
  019 Castroville 1244 1151
  113 King City-Oasis Rd. 1071 951
  193 Pacific Grove 246 246
  129 Pajaro 661 630
  116 Salinas North 663 619
  214 Salinas South II 570 536
 
Napa 109 Carneros 1233 916
  077 Oakville 1100 970
 
Orange 075 Irvine 166 159
 
Placer 195 Auburn 567 507
 
Riverside 135 Blythe NE 585 574
  118 Cathedral City 108 105
  200 Indio 2 351 345
  208 La Quinta II 333 327
  238 Moreno Valley 276 276
  136 Oasis 105 105
  240 Perris 754 715
  151 Ripley 692 661
  062 Temecula 125 125
  237 Temecula East III 278 278
  218 Thermal South 626 597
  044 U.C. Riverside 173 173
  179 Winchester 798 764
 
Sacramento 131 Fair Oaks 868 795
  140 Twitchell Island 942 885
 
San Benito 126 San Benito 920 829
  143 San Juan Valley 1023 917
 
San Bernardino 134 Barstow NE 42 39
  199 Big Bear Lake 2155 715
  233 Joshua Tree 959 876
  192 Lake Arrowhead 1999 1062
  117 Victorville 1190 992
 
San Diego 207 Borrego Springs 566 540
  153 Escondido SPV 537 510
  173 La Jolla 12 12
  150 Miramar 159 159
  147 Otay Lake 129 129
  184 San Diego II 49 49
 
San Joaquin 166 Lodi West 1230 1030
  070 Manteca 1203 969
  167 Tracy 928 832
 
San Luis Obispo 163 Atascadero 1229 858
  202 Nipomo 351 346
  052 San Luis Obispo 469 465
  160 San Luis Obispo West 567 560
 
Santa Barbara 088 Cuyama 1355 1070
  094 Goleta Foothills 19 19
  231 Lompoc 834 761
  107 Santa Barbara 218 218
  230 Santa Barbara II 15 15
  232 Santa Maria II 522 490
  064 Santa Ynez 1081 811
  165 Sisquoc 705 646
 
Santa Clara 211 Gilroy 1009 781
 
Santa Cruz 104 De Laveaga 701 660
  209 Watsonville West II 342 317
 
Shasta 043 McArthur 2240 986
  224 Shasta College 1169 760
 
Siskiyou 091 Tulelake FS 2431 968
 
Solano 121 Dixon 1213 1031
  212 Hastings Tract East 1128 881
  139 Winters 1010 882
 
Sonoma 158 Bennett Valley 1466 1223
  144 Petaluma East 1310 1020
  083 Santa Rosa 1339 873
  103 Windsor 1287 816
 
Stanislaus 206 Denair 952 840
  071 Modesto 1255 999
  194 Oakdale 899 800
  161 Patterson 896 845
 
Sutter 235 Verona 1258 979
 
Tehama 008 Gerber 987 819
 
Tulare 203 Alpaugh 1324 953
  182 Delano 1166 995
  086 Lindcove 1008 882
  169 Porterville 1162 965
 
Ventura 152 Camarillo 324 324
  156 Oxnard 160 160
  198 Santa Paula 369 369
 
Yolo 155 Bryte 866 814
  006 Davis 957 871
  196 Esparto 622 591
  226 Woodland 950 856
 
Yuba 084 Browns Valley 525 483
 
 *  Cumulative Chilling Hours
    Hours below 45°F
    Hours between 32°F and 45°F
    November 1 thru February 28/29
 *  Cumulative Chilling Portions
    Portions (Dynamic Model)
    September 1 through August 31
 *  Cumulative Chilling - Research
    Hours below 45°F
    Hours between 32°F and 45°F
    Units (Utah Model)
    September 1 through August 31
   *  Harvest Prediction Module
    for Peaches, Plums, and Nectarines
    February 1 through May 31
 *  Fruit & Nut Research and Information Center
 *  Weather-Related Models
 *  Harvest Prediction: About Growing Degree Hours