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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 831 828
  191 Pleasanton 1002 927
  171 Union City 828 780
 
Butte 012 Durham 1153 1039
 
Colusa 032 Colusa 1117 1030
 
Contra Costa 047 Brentwood 920 884
  170 Concord 967 899
  178 Moraga 1202 982
 
El Dorado 013 Camino 1671 1504
 
Fresno 007 Firebaugh/Telles 1023 884
  190 Five Points South West 1208 1006
  002 FivePoints/WSFS USDA 1098 945
  080 Fresno State 1032 930
  142 Orange Cove 1136 990
  124 Panoche 1009 910
  039 Parlier 1054 923
  105 Westlands 1082 869
 
Glenn 061 Orland 1027 959
 
Imperial 041 Calipatria/Mulberry 683 614
  087 Meloland 513 505
  175 Palo Verde II 871 725
  128 Salton Sea East 448 446
  127 Salton Sea West 80 80
  068 Seeley 554 534
  181 Westmorland North 638 596
 
Inyo 035 Bishop 2114 1053
  183 Owens Lake North 1958 1373
  189 Owens Lake South 1963 1151
 
Kern 125 Arvin-Edison 863 789
  146 Belridge 939 813
  054 Blackwells Corner 981 917
  138 Famoso 1091 944
  005 Shafter/USDA 1106 921
 
Kings 021 Kettleman 798 767
  015 Stratford 1092 906
 
Lassen 057 Buntingville 2523 962
 
Los Angeles 082 Claremont
  133 Glendale 538 538
  174 Long Beach 450 450
  159 Monrovia 381 381
  197 Palmdale 1548 1066
  078 Pomona 508 506
  204 Santa Clarita 510 510
  099 Santa Monica 54 54
 
Madera 145 Madera 1147 993
 
Marin 187 Black Point 1938 1544
  157 Point San Pedro 1047 952
 
Mendocino 085 Hopland FS 1327 1252
  106 Sanel Valley 1405 1052
 
Merced 092 Kesterson 1243 1046
  056 Los Banos 1178 994
  148 Merced 1248 1014
 
Modoc 090 Alturas 2642 843
 
Monterey 114 Arroyo Seco 1019 907
  019 Castroville 825 800
  113 King City-Oasis Rd. 1088 961
  129 Pajaro 726 710
  116 Salinas North 928 910
  089 Salinas South 1029 1011
 
Napa 109 Carneros 1068 891
  077 Oakville 1087 994
 
Orange 075 Irvine 193 193
 
Placer 195 Auburn 1150 1097
 
Riverside 135 Blythe NE 754 714
  118 Cathedral City 363 363
  200 Indio 2 469 399
  136 Oasis 302 300
  151 Ripley 833 757
  154 Salton Sea North
  062 Temecula 248 248
  137 Temecula East II 936 881
  044 U.C. Riverside 348 348
  179 Winchester 967 892
 
Sacramento 131 Fair Oaks 944 922
  140 Twitchell Island 988 935
 
San Benito 126 San Benito 971 898
  143 San Juan Valley 1075 979
 
San Bernardino 134 Barstow NE 1092 876
  199 Big Bear Lake 2387 780
  192 Lake Arrowhead 2309 1041
  117 Victorville 1391 1086
 
San Diego 153 Escondido SPV 493 439
  173 La Jolla 31 31
  150 Miramar 145 142
  147 Otay Lake 214 211
  184 San Diego II 145 142
 
San Joaquin 166 Lodi West 1131 1045
  070 Manteca 1045 972
  167 Tracy 928 880
 
San Luis Obispo 163 Atascadero 1214 883
  202 Nipomo 548 547
  052 San Luis Obispo 426 424
  160 San Luis Obispo West 601 598
 
Santa Barbara 088 Cuyama 847 847
  094 Goleta Foothills
  107 Santa Barbara 260 252
  064 Santa Ynez 1016 762
  165 Sisquoc 834 818
 
Santa Clara 132 Morgan Hill 829 788
 
Santa Cruz 104 De Laveaga 824 820
  111 Green Valley Road 928 845
 
Shasta 043 McArthur 2571 1141
 
Siskiyou 091 Tulelake FS 2661 874
 
Solano 121 Dixon 1515 1308
  122 Hastings Tract 964 890
  123 Suisun Valley 947 898
  139 Winters 1052 953
 
Sonoma 158 Bennett Valley 1081 922
  144 Petaluma East 1137 1000
  083 Santa Rosa 1235 997
  103 Windsor 1201 980
 
Stanislaus 168 Denair 1374 1141
  071 Modesto 1268 1102
  194 Oakdale 1157 1073
  161 Patterson 917 884
 
Sutter 030 Nicolaus 1193 1071
 
Tehama 008 Gerber 1123 1068
 
Tulare 203 Alpaugh 1305 972
  182 Delano 1110 918
  086 Lindcove 742 689
  169 Porterville 1092 900
 
Ventura 152 Camarillo 445 445
  156 Oxnard 318 318
  101 Piru
  198 Santa Paula 493 492
 
Yolo 155 Bryte 896 886
  006 Davis 1097 1032
  196 Esparto 653 648
  027 Zamora
 
Yuba 084 Browns Valley 855 844
 
 *  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
 *  About Growing Degree Hours (GDH)
 *  About Pomology Weather Services
 *  About Weather Stations
 *  Weather-related Links
 *  About Chilling

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