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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 191 Pleasanton 134 134
  171 Union City 80 80
 
Amador 227 Plymouth 292 292
 
Butte 012 Durham 187 185
 
Colusa 032 Colusa 117 117
 
Contra Costa 047 Brentwood 80 80
  170 Concord 584 392
  213 El Cerrito 0 0
  178 Moraga 216 216
 
El Dorado 013 Camino 248 248
  228 Diamond Springs 148 148
 
Fresno 205 Coalinga 98 98
  007 Firebaugh/Telles 111 111
  190 Five Points South West 138 138
  002 FivePoints/WSFS USDA 166 166
  080 Fresno State 140 140
  142 Orange Cove 138 138
  124 Panoche 119 119
  039 Parlier 570 528
  105 Westlands 126 126
 
Imperial 041 Calipatria/Mulberry 108 108
  087 Meloland 34 34
  175 Palo Verde II 209 209
  128 Salton Sea East
  127 Salton Sea West
  068 Seeley 62 62
  201 UC-Andrade 35 35
  186 UC-San Luis 11 11
  181 Westmorland North 79 77
 
Inyo 035 Bishop 670 437
  183 Owens Lake North 517 469
  189 Owens Lake South 515 413
 
Kern 125 Arvin-Edison 134 134
  146 Belridge 158 158
  054 Blackwells Corner 198 198
  138 Famoso 216 216
  005 Shafter/USDA 575 420
 
Kings 021 Kettleman 64 64
  015 Stratford 156 155
 
Lassen 057 Buntingville 870 438
 
Los Angeles 216 Arleta 18 18
  215 Chatsworth 10 10
  133 Glendale 17 17
  174 Long Beach 101 101
  159 Monrovia 8 8
  197 Palmdale 408 337
  220 Palmdale Central 266 259
  078 Pomona 12 12
  204 Santa Clarita 43 43
  099 Santa Monica 0 0
  219 West Hills 28 28
 
Madera 145 Madera
  188 Madera II 160 160
 
Marin 187 Black Point 119 119
  157 Point San Pedro 47 47
 
Mendocino 085 Hopland FS 118 118
  106 Sanel Valley 201 195
 
Merced 092 Kesterson 357 347
  056 Los Banos 138 138
  148 Merced 247 247
 
Modoc 090 Alturas 884 640
 
Monterey 114 Arroyo Seco 83 83
  210 Carmel 84 84
  019 Castroville 190 190
  113 King City-Oasis Rd. 124 124
  193 Pacific Grove 2 2
  129 Pajaro 39 39
  116 Salinas North 32 32
  214 Salinas South II 24 24
 
Napa 109 Carneros 177 175
  077 Oakville 160 160
 
Orange 075 Irvine 0 0
 
Placer 195 Auburn 48 48
 
Riverside 135 Blythe NE 136 136
  118 Cathedral City 0 0
  200 Indio 2 37 37
  208 La Quinta II 129 128
  238 Moreno Valley 19 19
  136 Oasis 0 0
  240 Perris 143 143
  151 Ripley 159 159
  062 Temecula 0 0
  237 Temecula East III 8 8
  218 Thermal South 111 111
  044 U.C. Riverside 15 15
  179 Winchester 131 131
 
Sacramento 131 Fair Oaks 82 82
  140 Twitchell Island 83 83
 
San Benito 126 San Benito 78 78
  143 San Juan Valley 114 114
 
San Bernardino 134 Barstow NE
  199 Big Bear Lake 862 427
  233 Joshua Tree 257 254
  192 Lake Arrowhead 699 544
  117 Victorville 295 284
 
San Diego 207 Borrego Springs 109 109
  153 Escondido SPV 151 151
  173 La Jolla 0 0
  150 Miramar 0 0
  147 Otay Lake 0 0
  184 San Diego II 0 0
 
San Joaquin 166 Lodi West 167 167
  070 Manteca 141 141
  167 Tracy 108 108
 
San Luis Obispo 163 Atascadero 242 223
  202 Nipomo 46 46
  052 San Luis Obispo 28 28
  160 San Luis Obispo West 45 45
 
Santa Barbara 088 Cuyama 349 340
  094 Goleta Foothills 0 0
  231 Lompoc 120 120
  107 Santa Barbara 0 0
  230 Santa Barbara II 0 0
  232 Santa Maria II 38 38
  064 Santa Ynez 204 194
  165 Sisquoc 92 92
 
Santa Clara 211 Gilroy 176 175
 
Santa Cruz 104 De Laveaga 71 71
  209 Watsonville West II 19 19
 
Shasta 043 McArthur 852 662
  224 Shasta College 205 187
 
Siskiyou 091 Tulelake FS 886 650
 
Solano 121 Dixon 442 436
  212 Hastings Tract East 148 148
  139 Winters 150 148
 
Sonoma 158 Bennett Valley 274 274
  144 Petaluma East 434 427
  083 Santa Rosa 209 207
  103 Windsor 270 270
 
Stanislaus 206 Denair 87 87
  071 Modesto 161 161
  194 Oakdale 126 126
  161 Patterson 397 306
 
Sutter 235 Verona 172 172
 
Tehama 008 Gerber
 
Tulare 203 Alpaugh 302 249
  182 Delano 202 198
  086 Lindcove 101 101
  169 Porterville 286 286
 
Ventura 152 Camarillo 11 11
  156 Oxnard 18 18
  198 Santa Paula 191 150
 
Yolo 155 Bryte 61 61
  006 Davis 81 81
  196 Esparto 26 26
  226 Woodland 83 83
 
Yuba 084 Browns Valley 38 38
 
 *  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