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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 490 480
  191 Pleasanton 851 787
  171 Union City 639 613
 
Butte 012 Durham 869 726
 
Colusa 032 Colusa 789 687
 
Contra Costa 047 Brentwood 761 711
  170 Concord 821 762
  178 Moraga 1009 880
 
El Dorado 013 Camino 1178 1075
 
Fresno 007 Firebaugh/Telles 766 700
  190 Five Points South West 823 742
  002 FivePoints/WSFS USDA 1001 797
  080 Fresno State 790 746
  142 Orange Cove 938 886
  124 Panoche 680 639
  039 Parlier 793 739
  105 Westlands 812 715
 
Glenn 061 Orland 872 747
 
Imperial 041 Calipatria/Mulberry 534 517
  087 Meloland 280 280
  175 Palo Verde II 703 614
  128 Salton Sea East 302 302
  127 Salton Sea West 16 16
  068 Seeley 354 342
  181 Westmorland North 262 262
 
Inyo 035 Bishop 1777 742
  183 Owens Lake North 1615 1175
  189 Owens Lake South 1648 898
 
Kern 125 Arvin-Edison 765 730
  146 Belridge 861 809
  054 Blackwells Corner 832 722
  138 Famoso 978 927
  005 Shafter/USDA 961 879
 
Kings 021 Kettleman 573 552
  015 Stratford 858 790
 
Lassen 057 Buntingville 2128 704
 
Los Angeles 133 Glendale 286 284
  174 Long Beach 304 303
  159 Monrovia 176 176
  197 Palmdale 1396 949
  078 Pomona 316 316
  204 Santa Clarita 66 66
  099 Santa Monica 48 48
 
Madera 145 Madera 945 830
 
Marin 187 Black Point 724 668
  157 Point San Pedro 737 711
 
Mendocino 085 Hopland FS 822 757
  106 Sanel Valley 956 733
 
Merced 092 Kesterson 991 858
  056 Los Banos 923 830
  148 Merced 1322 908
 
Modoc 090 Alturas 2027 1053
 
Monterey 114 Arroyo Seco 671 621
  019 Castroville 515 487
  113 King City-Oasis Rd. 771 717
  129 Pajaro 391 373
  116 Salinas North 739 712
  089 Salinas South 841 813
 
Napa 109 Carneros 706 585
  077 Oakville 782 688
 
Orange 075 Irvine 81 81
 
Placer 195 Auburn 869 810
 
Riverside 135 Blythe NE 517 504
  118 Cathedral City 236 230
  200 Indio 2 397 281
  136 Oasis 123 123
  151 Ripley 599 580
  062 Temecula 162 161
  137 Temecula East II 755 738
  044 U.C. Riverside 202 202
  179 Winchester 770 752
 
Sacramento 131 Fair Oaks 647 608
  140 Twitchell Island 878 816
 
San Benito 126 San Benito 674 636
  143 San Juan Valley 734 690
 
San Bernardino 134 Barstow NE 1022 881
  199 Big Bear Lake 2019 634
  192 Lake Arrowhead 1859 962
  117 Victorville 1189 941
 
San Diego 153 Escondido SPV 529 509
  173 La Jolla 3 3
  150 Miramar 107 107
  147 Otay Lake 78 78
  184 San Diego II 17 17
 
San Joaquin 166 Lodi West 785 695
  070 Manteca 687 623
  167 Tracy 744 694
 
San Luis Obispo 163 Atascadero 1047 844
  202 Nipomo 258 257
  052 San Luis Obispo 312 311
  160 San Luis Obispo West 451 443
 
Santa Barbara 088 Cuyama 1229 1006
  094 Goleta Foothills 25 25
  107 Santa Barbara 252 251
  064 Santa Ynez 951 839
  165 Sisquoc 611 594
 
Santa Clara 211 Gilroy 104 104
 
Santa Cruz 104 De Laveaga 539 516
  111 Green Valley Road 372 360
 
Shasta 043 McArthur 2114 1208
 
Siskiyou 091 Tulelake FS 2104 1084
 
Solano 121 Dixon 753 731
  122 Hastings Tract
  212 Hastings Tract East 116 116
  123 Suisun Valley 711 653
  139 Winters 861 761
 
Sonoma 158 Bennett Valley 1176 1039
  144 Petaluma East 826 735
  083 Santa Rosa 861 712
  103 Windsor 848 699
 
Stanislaus 206 Denair 103 103
  071 Modesto 947 819
  194 Oakdale 887 833
  161 Patterson 751 725
 
Sutter 030 Nicolaus 827 730
 
Tehama 008 Gerber 883 777
 
Tulare 203 Alpaugh 1243 1013
  182 Delano 980 916
  086 Lindcove 751 714
  169 Porterville 1132 1003
 
Ventura 152 Camarillo 332 332
  156 Oxnard 82 82
  198 Santa Paula 384 384
 
Yolo 155 Bryte 691 658
  006 Davis 855 766
  196 Esparto 495 469
 
Yuba 084 Browns Valley 614 582
 
 *  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