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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 149 Oakland Foothills 664 642
  191 Pleasanton 947 782
  171 Union City 836 765
 
Amador 227 Plymouth 1625 1468
 
Butte 012 Durham 77 64
 
Colusa 032 Colusa 1012 825
 
Contra Costa 047 Brentwood 982 843
  170 Concord 993 816
  178 Moraga 1113 842
 
El Dorado 013 Camino 1143 1122
  228 Diamond Springs 942 924
 
Fresno 205 Coalinga 1040 969
  007 Firebaugh/Telles 1019 824
  190 Five Points South West 1098 827
  002 FivePoints/WSFS USDA 1089 842
  080 Fresno State 1060 874
  142 Orange Cove 1184 957
  124 Panoche 1021 829
  039 Parlier 1097 879
  105 Westlands 1066 775
 
Imperial 041 Calipatria/Mulberry 670 633
  087 Meloland 468 463
  175 Palo Verde II 833 742
  128 Salton Sea East 515 507
  127 Salton Sea West 104 104
  068 Seeley 280 279
  201 UC-Andrade 395 391
  186 UC-San Luis 529 504
  181 Westmorland North 586 576
 
Inyo 035 Bishop 1734 729
  183 Owens Lake North 1747 1291
  189 Owens Lake South 1766 911
 
Kern 125 Arvin-Edison 950 831
  146 Belridge 1099 920
  054 Blackwells Corner 1113 981
  138 Famoso 1173 1029
  005 Shafter/USDA 1102 862
 
Kings 021 Kettleman 824 775
  015 Stratford 1132 868
 
Lassen 057 Buntingville 2115 908
 
Los Angeles 216 Arleta 292 292
  215 Chatsworth 142 142
  133 Glendale 397 397
  174 Long Beach 521 515
  159 Monrovia 318 318
  197 Palmdale 1415 908
  220 Palmdale Central 1150 890
  078 Pomona 533 515
  204 Santa Clarita 448 448
  099 Santa Monica 43 43
  219 West Hills 328 328
 
Madera 145 Madera 1363 968
 
Marin 187 Black Point 1181 937
  157 Point San Pedro 915 842
 
Mendocino 085 Hopland FS 1100 1063
  106 Sanel Valley 1362 846
 
Merced 092 Kesterson 1347 933
  056 Los Banos 1209 878
  148 Merced 1287 893
 
Modoc 090 Alturas 2128 832
 
Monterey 114 Arroyo Seco 1035 911
  210 Carmel 926 898
  019 Castroville 873 824
  113 King City-Oasis Rd. 1112 937
  193 Pacific Grove 7 7
  129 Pajaro 749 693
  116 Salinas North 819 796
  089 Salinas South 864 817
 
Napa 109 Carneros 1172 871
  077 Oakville 1077 906
 
Orange 075 Irvine 326 326
 
Placer 195 Auburn 912 875
 
Riverside 135 Blythe NE 726 684
  118 Cathedral City 188 186
  200 Indio 2 384 377
  208 La Quinta II 378 374
  136 Oasis 137 137
  151 Ripley 766 703
  062 Temecula 104 104
  218 Thermal South 716 648
  044 U.C. Riverside 286 286
  179 Winchester 996 868
 
Sacramento 131 Fair Oaks 898 851
  140 Twitchell Island 1152 884
 
San Benito 126 San Benito 940 810
  143 San Juan Valley 996 845
 
San Bernardino 134 Barstow NE 1099 889
  199 Big Bear Lake 2129 667
  192 Lake Arrowhead 2062 990
  117 Victorville 1211 934
 
San Diego 207 Borrego Springs 627 584
  153 Escondido SPV 765 684
  173 La Jolla 10 10
  150 Miramar 310 310
  147 Otay Lake 259 259
  184 San Diego II 97 97
 
San Joaquin 166 Lodi West 1160 924
  070 Manteca 1062 861
  167 Tracy 957 822
 
San Luis Obispo 163 Atascadero 1249 855
  202 Nipomo 666 653
  052 San Luis Obispo 498 495
  160 San Luis Obispo West 726 714
 
Santa Barbara 088 Cuyama 1330 941
  094 Goleta Foothills 0 0
  231 Lompoc 890 763
  107 Santa Barbara 323 323
  230 Santa Barbara II 269 269
  232 Santa Maria II 632 620
  064 Santa Ynez 1122 848
  165 Sisquoc 782 749
 
Santa Clara 211 Gilroy 981 757
 
Santa Cruz 104 De Laveaga 900 879
  209 Watsonville West II 496 491
 
Shasta 043 McArthur 2108 929
 
Siskiyou 091 Tulelake FS 2195 960
 
Solano 121 Dixon 1126 923
  212 Hastings Tract East 1093 890
  139 Winters 1062 903
 
Sonoma 158 Bennett Valley 1494 1170
  144 Petaluma East 1123 905
  083 Santa Rosa 1222 847
  103 Windsor 1402 914
 
Stanislaus 206 Denair 1073 796
  071 Modesto 1203 923
  194 Oakdale 661 588
  161 Patterson 922 856
 
Tehama 008 Gerber 1068 903
 
Tulare 203 Alpaugh 1271 864
  086 Lindcove 1074 873
  169 Porterville 1307 997
 
Ventura 152 Camarillo 630 605
  156 Oxnard 339 339
  198 Santa Paula 452 452
 
Yolo 155 Bryte 904 872
  006 Davis 990 842
  196 Esparto 667 647
  226 Woodland 886 787
 
Yuba 084 Browns Valley 655 646
 
 *  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