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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 609 587
  191 Pleasanton 835 670
  171 Union City 747 676
 
Amador 227 Plymouth 1393 1264
 
Butte 012 Durham 1976 64
 
Colusa 032 Colusa 913 729
 
Contra Costa 047 Brentwood 874 735
  170 Concord 889 712
  178 Moraga 973 705
 
El Dorado 013 Camino 988 967
  228 Diamond Springs 858 825
 
Fresno 205 Coalinga 945 874
  007 Firebaugh/Telles 903 710
  190 Five Points South West 975 713
  002 FivePoints/WSFS USDA 970 724
  080 Fresno State 959 773
  142 Orange Cove 1086 859
  124 Panoche 914 722
  039 Parlier 1000 782
  105 Westlands 939 658
 
Imperial 041 Calipatria/Mulberry 569 532
  087 Meloland 406 401
  175 Palo Verde II 724 638
  128 Salton Sea East 445 437
  127 Salton Sea West 103 103
  068 Seeley 277 276
  201 UC-Andrade 338 334
  186 UC-San Luis 472 440
  181 Westmorland North 504 494
 
Inyo 035 Bishop 1495 615
  183 Owens Lake North 1520 1110
  189 Owens Lake South 1550 792
 
Kern 125 Arvin-Edison 897 776
  146 Belridge 1003 824
  054 Blackwells Corner 999 867
  138 Famoso 1068 924
  005 Shafter/USDA 994 760
 
Kings 021 Kettleman 763 714
  015 Stratford 1014 750
 
Lassen 057 Buntingville 1800 757
 
Los Angeles 216 Arleta 269 269
  215 Chatsworth 137 137
  133 Glendale 365 365
  174 Long Beach 466 460
  159 Monrovia 294 294
  197 Palmdale 1215 763
  220 Palmdale Central 994 770
  078 Pomona 478 460
  204 Santa Clarita 418 418
  099 Santa Monica 25 23
  219 West Hills 316 316
 
Madera 145 Madera 1215 829
 
Marin 187 Black Point 1033 800
  157 Point San Pedro 807 736
 
Mendocino 085 Hopland FS 980 943
  106 Sanel Valley 1201 723
 
Merced 092 Kesterson 1180 790
  056 Los Banos 1055 743
  148 Merced 1142 759
 
Modoc 090 Alturas 1821 688
 
Monterey 114 Arroyo Seco 923 799
  210 Carmel 819 791
  019 Castroville 767 718
  113 King City-Oasis Rd. 996 823
  129 Pajaro 675 619
  116 Salinas North 734 711
  089 Salinas South 776 729
 
Napa 109 Carneros 1094 746
  077 Oakville 960 792
 
Orange 075 Irvine 290 290
 
Placer 195 Auburn 839 802
 
Riverside 135 Blythe NE 629 587
  118 Cathedral City 180 178
  200 Indio 2 451 350
  208 La Quinta II 344 340
  136 Oasis 135 135
  151 Ripley 665 602
  062 Temecula 99 99
  218 Thermal South 633 568
  044 U.C. Riverside 268 268
  179 Winchester 854 748
 
Sacramento 131 Fair Oaks 819 772
  140 Twitchell Island 1060 787
 
San Benito 126 San Benito 845 715
  143 San Juan Valley 889 740
 
San Bernardino 134 Barstow NE 964 779
  199 Big Bear Lake 1823 559
  192 Lake Arrowhead 1794 854
  117 Victorville 1098 822
 
San Diego 207 Borrego Springs 525 482
  153 Escondido SPV 672 593
  173 La Jolla 10 10
  150 Miramar 277 277
  147 Otay Lake 237 233
  184 San Diego II 95 95
 
San Joaquin 166 Lodi West 1041 805
  070 Manteca 944 744
  167 Tracy 861 727
 
San Luis Obispo 163 Atascadero 1107 746
  202 Nipomo 603 590
  052 San Luis Obispo 439 436
  160 San Luis Obispo West 653 641
 
Santa Barbara 088 Cuyama 1170 812
  094 Goleta Foothills 0 0
  231 Lompoc 799 675
  107 Santa Barbara 313 310
  230 Santa Barbara II 385 269
  232 Santa Maria II 574 562
  064 Santa Ynez 975 727
  165 Sisquoc 717 684
 
Santa Clara 211 Gilroy 871 651
 
Santa Cruz 104 De Laveaga 789 768
  209 Watsonville West II 462 457
 
Shasta 043 McArthur 1819 782
 
Siskiyou 091 Tulelake FS 1885 810
 
Solano 121 Dixon 1010 811
  212 Hastings Tract East 964 762
  139 Winters 964 806
 
Sonoma 158 Bennett Valley 1290 998
  144 Petaluma East 985 780
  083 Santa Rosa 1053 703
  103 Windsor 1199 748
 
Stanislaus 206 Denair 1052 751
  071 Modesto 1059 786
  194 Oakdale 1337 443
  161 Patterson 837 771
 
Tehama 008 Gerber 941 776
 
Tulare 203 Alpaugh 1150 760
  086 Lindcove 980 779
  169 Porterville 1187 881
 
Ventura 152 Camarillo 583 558
  156 Oxnard 324 324
  198 Santa Paula 433 433
 
Yolo 155 Bryte 827 795
  006 Davis 888 740
  196 Esparto 624 604
  226 Woodland 804 705
 
Yuba 084 Browns Valley 608 599
 
*  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

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