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 191 Pleasanton 539 507
  171 Union City 417 399
 
Amador 227 Plymouth 901 805
 
Butte 012 Durham 636 567
 
Colusa 032 Colusa 425 393
 
Contra Costa 047 Brentwood 232 230
  170 Concord 1133 836
  213 El Cerrito 128 128
  178 Moraga 704 648
 
El Dorado 013 Camino 576 556
  228 Diamond Springs 467 455
 
Fresno 205 Coalinga 483 463
  007 Firebaugh/Telles 499 461
  190 Five Points South West 534 475
  002 FivePoints/WSFS USDA 588 522
  080 Fresno State 543 483
  142 Orange Cove 608 548
  124 Panoche 516 469
  039 Parlier 1026 940
  105 Westlands 530 474
 
Imperial 041 Calipatria/Mulberry 427 365
  087 Meloland 267 250
  175 Palo Verde II 548 485
  128 Salton Sea East
  127 Salton Sea West
  068 Seeley 310 293
  201 UC-Andrade 447 169
  186 UC-San Luis 11 11
  181 Westmorland North 383 325
 
Inyo 035 Bishop 1370 733
  183 Owens Lake North 1220 937
  189 Owens Lake South 1204 814
 
Kern 125 Arvin-Edison 491 434
  146 Belridge 543 498
  054 Blackwells Corner 709 622
  138 Famoso 671 634
  005 Shafter/USDA 1141 766
 
Kings 021 Kettleman 497 384
  015 Stratford 537 484
 
Lassen 057 Buntingville 1764 800
 
Los Angeles 216 Arleta 142 142
  215 Chatsworth 130 126
  133 Glendale 153 153
  174 Long Beach 248 245
  159 Monrovia 116 114
  197 Palmdale 1000 733
  220 Palmdale Central 756 651
  078 Pomona 179 178
  204 Santa Clarita 219 205
  099 Santa Monica 41 41
  219 West Hills 160 146
 
Madera 145 Madera
  188 Madera II 553 499
 
Marin 187 Black Point 503 484
  157 Point San Pedro 291 286
 
Mendocino 085 Hopland FS 449 433
  106 Sanel Valley 654 550
 
Merced 092 Kesterson 1032 906
  056 Los Banos 582 524
  148 Merced 859 762
 
Modoc 090 Alturas 1754 1084
 
Monterey 114 Arroyo Seco 374 351
  210 Carmel 362 332
  019 Castroville 692 671
  113 King City-Oasis Rd. 533 487
  193 Pacific Grove 61 61
  129 Pajaro 230 223
  116 Salinas North 249 249
  214 Salinas South II 225 224
 
Napa 109 Carneros 596 567
  077 Oakville 521 504
 
Orange 075 Irvine 76 76
 
Placer 195 Auburn 340 323
 
Riverside 135 Blythe NE 459 403
  118 Cathedral City 0 0
  200 Indio 2 235 203
  208 La Quinta II 365 346
  238 Moreno Valley 204 192
  136 Oasis 162 104
  240 Perris 498 453
  151 Ripley 513 454
  062 Temecula 106 96
  237 Temecula East III 178 171
  218 Thermal South 394 344
  044 U.C. Riverside 147 138
  179 Winchester 493 455
 
Sacramento 131 Fair Oaks 425 412
  140 Twitchell Island 489 466
 
San Benito 126 San Benito 440 336
  143 San Juan Valley 498 458
 
San Bernardino 134 Barstow NE
  199 Big Bear Lake 1760 772
  233 Joshua Tree 695 592
  192 Lake Arrowhead 1457 934
  117 Victorville 798 673
 
San Diego 207 Borrego Springs 399 361
  153 Escondido SPV 389 379
  173 La Jolla 52 52
  150 Miramar 90 90
  147 Otay Lake 87 84
  184 San Diego II 45 45
 
San Joaquin 166 Lodi West 594 559
  070 Manteca 576 521
  167 Tracy 522 487
 
San Luis Obispo 163 Atascadero 732 533
  202 Nipomo 162 162
  052 San Luis Obispo 150 136
  160 San Luis Obispo West 260 245
 
Santa Barbara 088 Cuyama 869 725
  094 Goleta Foothills 1 1
  231 Lompoc 418 385
  107 Santa Barbara 87 83
  230 Santa Barbara II 14 0
  232 Santa Maria II 236 236
  064 Santa Ynez 598 492
  165 Sisquoc 488 212
 
Santa Clara 211 Gilroy 588 529
 
Santa Cruz 104 De Laveaga 439 175
  209 Watsonville West II 165 163
 
Shasta 043 McArthur 1686 1140
  224 Shasta College 599 504
 
Siskiyou 091 Tulelake FS 1733 1076
 
Solano 121 Dixon 1109 1012
  212 Hastings Tract East 652 607
  139 Winters 555 512
 
Sonoma 158 Bennett Valley 825 790
  144 Petaluma East 1194 1035
  083 Santa Rosa 654 602
  103 Windsor 757 700
 
Stanislaus 206 Denair 682 529
  071 Modesto 628 566
  194 Oakdale 626 577
  161 Patterson 1083 959
 
Sutter 235 Verona 614 572
 
Tehama 008 Gerber
  222 Gerber South 504 476
 
Tulare 203 Alpaugh 1024 803
  182 Delano 800 671
  086 Lindcove 478 442
  169 Porterville 1001 861
 
Ventura 152 Camarillo 118 118
  156 Oxnard 152 152
  198 Santa Paula 386 345
 
Yolo 155 Bryte 407 398
  006 Davis 462 444
  196 Esparto 302 295
  226 Woodland 455 437
 
Yuba 084 Browns Valley 306 297
 
 *  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