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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 580 571
  191 Pleasanton 962 892
  171 Union City 797 771
 
Butte 012 Durham 1195 1077
 
Colusa 032 Colusa 1129 1028
 
Contra Costa 047 Brentwood 758 714
  170 Concord 916 870
  178 Moraga 1140 1001
 
El Dorado 013 Camino 1256 1046
 
Fresno 007 Firebaugh/Telles 1035 922
  190 Five Points South West 1254 1007
  002 FivePoints/WSFS USDA 1212 969
  080 Fresno State 1052 1004
  142 Orange Cove 1166 1093
  124 Panoche 1097 979
  039 Parlier 1047 999
  105 Westlands 1056 854
 
Glenn 061 Orland 1129 1061
 
Imperial 041 Calipatria/Mulberry 539 523
  087 Meloland 347 346
  175 Palo Verde II 673 642
  128 Salton Sea East 462 446
  127 Salton Sea West 36 36
  068 Seeley 395 389
  181 Westmorland North 380 374
 
Inyo 035 Bishop 1863 849
  183 Owens Lake North 1616 1197
  189 Owens Lake South 1738 1012
 
Kern 125 Arvin-Edison 936 890
  146 Belridge 967 892
  054 Blackwells Corner 1011 952
  138 Famoso 1137 1066
  005 Shafter/USDA 1140 1041
 
Kings 021 Kettleman 789 768
  015 Stratford 1114 979
 
Lassen 057 Buntingville 2376 877
 
Los Angeles 082 Claremont
  133 Glendale 311 307
  174 Long Beach 388 387
  159 Monrovia 311 307
  197 Palmdale 1492 1059
  078 Pomona 427 423
  204 Santa Clarita 457 454
  099 Santa Monica 113 113
 
Madera 145 Madera 1231 1094
 
Marin 187 Black Point 1575 1211
  157 Point San Pedro 914 850
 
Mendocino 085 Hopland FS 1090 984
  106 Sanel Valley 1324 974
 
Merced 092 Kesterson 1258 999
  056 Los Banos 1221 1031
  148 Merced 1280 1036
 
Modoc 090 Alturas 2457 980
 
Monterey 114 Arroyo Seco 895 841
  019 Castroville 645 616
  113 King City-Oasis Rd. 970 864
  129 Pajaro 523 496
  116 Salinas North 683 670
  089 Salinas South 916 888
 
Napa 109 Carneros 1067 904
  077 Oakville 987 903
 
Orange 075 Irvine 229 229
 
Placer 195 Auburn 1084 1033
 
Riverside 135 Blythe NE 659 629
  118 Cathedral City 242 242
  200 Indio 2 374 253
  136 Oasis 307 306
  151 Ripley 666 636
  154 Salton Sea North
  062 Temecula 418 415
  137 Temecula East II 807 725
  044 U.C. Riverside 278 278
  179 Winchester 848 778
 
Sacramento 131 Fair Oaks 947 914
  140 Twitchell Island 1135 1073
 
San Benito 126 San Benito 866 836
  143 San Juan Valley 910 863
 
San Bernardino 134 Barstow NE 1063 926
  199 Big Bear Lake 2289 815
  192 Lake Arrowhead 1847 1183
  117 Victorville 1335 1074
 
San Diego 153 Escondido SPV 653 612
  173 La Jolla 41 41
  150 Miramar 198 198
  147 Otay Lake 171 171
  184 San Diego II 89 89
 
San Joaquin 166 Lodi West 1043 967
  070 Manteca 1044 980
  167 Tracy 986 943
 
San Luis Obispo 163 Atascadero 1174 861
  202 Nipomo 444 443
  052 San Luis Obispo 372 366
  160 San Luis Obispo West 531 518
 
Santa Barbara 088 Cuyama 1432 1087
  094 Goleta Foothills 17 17
  107 Santa Barbara 316 316
  064 Santa Ynez 890 734
  165 Sisquoc 674 637
 
Santa Clara 132 Morgan Hill
 
Santa Cruz 104 De Laveaga 678 664
  111 Green Valley Road 799 739
 
Shasta 043 McArthur 2462 1059
 
Siskiyou 091 Tulelake FS 2502 1021
 
Solano 121 Dixon 1075 971
  122 Hastings Tract 1091 1008
  123 Suisun Valley 1018 946
  139 Winters 1107 1032
 
Sonoma 158 Bennett Valley 1127 961
  144 Petaluma East 1020 870
  083 Santa Rosa 1207 927
  103 Windsor 1444 1120
 
Stanislaus 168 Denair 1504 1158
  071 Modesto 1275 1108
  194 Oakdale 1132 1073
  161 Patterson 988 952
 
Sutter 030 Nicolaus 1254 1062
 
Tehama 008 Gerber 1161 1059
 
Tulare 203 Alpaugh 1347 1034
  182 Delano 1235 1096
  086 Lindcove 1009 969
  169 Porterville 1192 1068
 
Ventura 152 Camarillo 337 332
  156 Oxnard 245 245
  101 Piru
  198 Santa Paula 353 353
 
Yolo 155 Bryte 1007 974
  006 Davis 1212 1130
  196 Esparto 697 688
  027 Zamora
 
Yuba 084 Browns Valley 860 852
 
*  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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