Text-only Site Map

 
Fruit & Nut Research and Information Center Home Page
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 505 495
  191 Pleasanton 922 858
  171 Union City 672 646
 
Butte 012 Durham 941 798
 
Colusa 032 Colusa 829 727
 
Contra Costa 047 Brentwood 791 741
  170 Concord 896 837
  178 Moraga 1127 998
 
El Dorado 013 Camino 1404 1301
 
Fresno 007 Firebaugh/Telles 808 742
  190 Five Points South West 889 808
  002 FivePoints/WSFS USDA 1071 867
  080 Fresno State 872 828
  142 Orange Cove 1029 977
  124 Panoche 705 664
  039 Parlier 854 800
  105 Westlands 878 781
 
Glenn 061 Orland 935 810
 
Imperial 041 Calipatria/Mulberry 607 590
  087 Meloland 303 303
  175 Palo Verde II 755 666
  128 Salton Sea East 301 301
  127 Salton Sea West 16 16
  068 Seeley 374 362
  181 Westmorland North 294 294
 
Inyo 035 Bishop 2077 917
  183 Owens Lake North 1831 1386
  189 Owens Lake South 1905 1114
 
Kern 125 Arvin-Edison 824 789
  146 Belridge 942 890
  054 Blackwells Corner 950 840
  138 Famoso 1051 1000
  005 Shafter/USDA 1039 957
 
Kings 021 Kettleman 611 590
  015 Stratford 944 876
 
Lassen 057 Buntingville 2506 914
 
Los Angeles 133 Glendale 341 339
  174 Long Beach 323 322
  159 Monrovia 213 213
  197 Palmdale 1606 1136
  078 Pomona 373 373
  204 Santa Clarita 73 73
  099 Santa Monica 59 59
 
Madera 145 Madera 1039 924
 
Marin 187 Black Point 773 717
  157 Point San Pedro 815 788
 
Mendocino 085 Hopland FS 916 851
  106 Sanel Valley 1056 830
 
Merced 092 Kesterson 1067 934
  056 Los Banos 1000 907
  148 Merced 1545 1084
 
Modoc 090 Alturas 2410 1252
 
Monterey 114 Arroyo Seco 733 683
  019 Castroville 552 524
  113 King City-Oasis Rd. 864 810
  129 Pajaro 413 395
  116 Salinas North 832 805
  089 Salinas South 1072 1044
 
Napa 109 Carneros 751 630
  077 Oakville 854 760
 
Orange 075 Irvine 95 95
 
Placer 195 Auburn 935 876
 
Riverside 135 Blythe NE 550 537
  118 Cathedral City 237 231
  200 Indio 2 427 291
  136 Oasis 123 123
  151 Ripley 657 638
  062 Temecula 193 192
  137 Temecula East II 867 845
  044 U.C. Riverside 239 239
  179 Winchester 882 859
 
Sacramento 131 Fair Oaks 690 651
  140 Twitchell Island 935 873
 
San Benito 126 San Benito 732 694
  143 San Juan Valley 799 755
 
San Bernardino 134 Barstow NE 1129 985
  199 Big Bear Lake 2426 761
  192 Lake Arrowhead 2257 1187
  117 Victorville 1359 1101
 
San Diego 153 Escondido SPV 617 597
  173 La Jolla 3 3
  150 Miramar 124 124
  147 Otay Lake 106 106
  184 San Diego II 28 28
 
San Joaquin 166 Lodi West 824 734
  070 Manteca 717 653
  167 Tracy 772 722
 
San Luis Obispo 163 Atascadero 1176 966
  202 Nipomo 284 283
  052 San Luis Obispo 338 337
  160 San Luis Obispo West 509 501
 
Santa Barbara 088 Cuyama 1444 1205
  094 Goleta Foothills 27 27
  107 Santa Barbara 282 281
  064 Santa Ynez 1060 948
  165 Sisquoc 711 694
 
Santa Clara 211 Gilroy 165 165
 
Santa Cruz 104 De Laveaga 601 578
  111 Green Valley Road 394 382
 
Shasta 043 McArthur 2472 1463
 
Siskiyou 091 Tulelake FS 2504 1316
 
Solano 121 Dixon 896 872
  122 Hastings Tract
  212 Hastings Tract East 181 181
  123 Suisun Valley 761 703
  139 Winters 919 819
 
Sonoma 158 Bennett Valley 1327 1186
  144 Petaluma East 904 812
  083 Santa Rosa 962 813
  103 Windsor 950 801
 
Stanislaus 206 Denair 169 169
  071 Modesto 1048 920
  194 Oakdale 947 893
  161 Patterson 788 762
 
Sutter 030 Nicolaus 895 798
 
Tehama 008 Gerber 950 844
 
Tulare 203 Alpaugh 1428 1185
  182 Delano 1058 994
  086 Lindcove 814 777
  169 Porterville 1253 1124
 
Ventura 152 Camarillo 377 377
  156 Oxnard 82 82
  198 Santa Paula 424 424
 
Yolo 155 Bryte 712 679
  006 Davis 959 870
  196 Esparto 514 488
 
Yuba 084 Browns Valley 638 606
 
 *  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