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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 82 82
  171 Union City 47 47
 
Amador 227 Plymouth 8 8
 
Butte 012 Durham 148 146
 
Colusa 032 Colusa 79 79
 
Contra Costa 047 Brentwood 45 45
  170 Concord 216 199
  213 El Cerrito 0 0
  178 Moraga 147 147
 
El Dorado 013 Camino 106 106
  228 Diamond Springs 106 106
 
Fresno 205 Coalinga 54 54
  007 Firebaugh/Telles 44 44
  190 Five Points South West 81 81
  002 FivePoints/WSFS USDA 92 92
  080 Fresno State 71 71
  142 Orange Cove 60 60
  124 Panoche 58 58
  039 Parlier 226 214
  105 Westlands 64 64
 
Imperial 041 Calipatria/Mulberry 51 51
  087 Meloland 14 14
  175 Palo Verde II 104 104
  128 Salton Sea East
  127 Salton Sea West
  068 Seeley 29 29
  201 UC-Andrade 12 12
  186 UC-San Luis 0 0
  181 Westmorland North 42 40
 
Inyo 035 Bishop 318 206
  183 Owens Lake North 215 196
  189 Owens Lake South 214 169
 
Kern 125 Arvin-Edison 59 59
  146 Belridge 68 68
  054 Blackwells Corner 53 53
  138 Famoso 59 59
  005 Shafter/USDA 230 214
 
Kings 021 Kettleman 14 14
  015 Stratford 76 75
 
Lassen 057 Buntingville 420 231
 
Los Angeles 216 Arleta 1 1
  215 Chatsworth 13 13
  133 Glendale 1 1
  174 Long Beach 62 62
  159 Monrovia 0 0
  197 Palmdale 193 152
  220 Palmdale Central 10 10
  078 Pomona 5 5
  204 Santa Clarita 13 13
  099 Santa Monica 0 0
  219 West Hills 13 13
 
Madera 145 Madera
  188 Madera II 85 85
 
Marin 187 Black Point 89 89
  157 Point San Pedro 34 34
 
Mendocino 085 Hopland FS 79 79
  106 Sanel Valley 161 159
 
Merced 092 Kesterson 144 134
  056 Los Banos 66 66
  148 Merced 128 128
 
Modoc 090 Alturas 471 308
 
Monterey 114 Arroyo Seco 46 46
  210 Carmel 5 5
  019 Castroville 50 50
  113 King City-Oasis Rd. 64 64
  193 Pacific Grove 0 0
  129 Pajaro 18 18
  116 Salinas North 25 25
  214 Salinas South II 25 25
 
Napa 109 Carneros 127 127
  077 Oakville 113 113
 
Orange 075 Irvine 0 0
 
Placer 195 Auburn 27 27
 
Riverside 135 Blythe NE 37 37
  118 Cathedral City 0 0
  200 Indio 2 16 16
  208 La Quinta II 10 10
  238 Moreno Valley 9 9
  136 Oasis 0 0
  240 Perris 86 86
  151 Ripley 68 68
  062 Temecula 0 0
  237 Temecula East III 0 0
  218 Thermal South 52 52
  044 U.C. Riverside 0 0
  179 Winchester 75 75
 
Sacramento 131 Fair Oaks 52 52
  140 Twitchell Island 0 0
 
San Benito 126 San Benito 47 47
  143 San Juan Valley 55 55
 
San Bernardino 134 Barstow NE
  199 Big Bear Lake 438 239
  233 Joshua Tree 0 0
  192 Lake Arrowhead 368 273
  117 Victorville 142 135
 
San Diego 207 Borrego Springs 56 56
  153 Escondido SPV 84 84
  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 0 0
  070 Manteca 8 8
  167 Tracy 53 53
 
San Luis Obispo 163 Atascadero 127 119
  202 Nipomo 26 26
  052 San Luis Obispo 0 0
  160 San Luis Obispo West 2 2
 
Santa Barbara 088 Cuyama 158 152
  094 Goleta Foothills 0 0
  231 Lompoc 0 0
  107 Santa Barbara 0 0
  230 Santa Barbara II 0 0
  232 Santa Maria II 0 0
  064 Santa Ynez 121 115
  165 Sisquoc 52 52
 
Santa Clara 211 Gilroy 64 64
 
Santa Cruz 104 De Laveaga 36 36
  209 Watsonville West II 5 5
 
Shasta 043 McArthur 414 276
  224 Shasta College 118 109
 
Siskiyou 091 Tulelake FS 450 298
 
Solano 121 Dixon 179 179
  212 Hastings Tract East 89 89
  139 Winters 96 96
 
Sonoma 158 Bennett Valley 154 154
  144 Petaluma East 232 229
  083 Santa Rosa 161 160
  103 Windsor 164 164
 
Stanislaus 206 Denair 57 57
  071 Modesto 97 97
  194 Oakdale 72 72
  161 Patterson 84 84
 
Sutter 235 Verona 69 69
 
Tehama 008 Gerber
 
Tulare 203 Alpaugh 107 106
  182 Delano 72 72
  086 Lindcove 35 35
  169 Porterville 94 94
 
Ventura 152 Camarillo 2 2
  156 Oxnard 4 4
  198 Santa Paula 77 59
 
Yolo 155 Bryte 0 0
  006 Davis 10 10
  196 Esparto 17 17
  226 Woodland 0 0
 
Yuba 084 Browns Valley 23 23
 
 *  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