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 146 146
  191 Pleasanton 226 210
  171 Union City 165 165
 
Butte 012 Durham 182 160
 
Colusa 032 Colusa 228 208
 
Contra Costa 047 Brentwood 149 149
  170 Concord 191 190
  178 Moraga 322 250
 
El Dorado 013 Camino 256 256
 
Fresno 007 Firebaugh/Telles 106 106
  190 Five Points South West 202 188
  002 FivePoints/WSFS USDA 149 136
  080 Fresno State 221 221
  142 Orange Cove 220 220
  124 Panoche 169 161
  039 Parlier 245 245
  105 Westlands 195 183
 
Glenn 061 Orland 221 193
 
Imperial 041 Calipatria/Mulberry 82 82
  087 Meloland 36 36
  175 Palo Verde II 136 122
  128 Salton Sea East 36 36
  127 Salton Sea West 0 0
  068 Seeley 66 66
  181 Westmorland North
 
Inyo 035 Bishop 414 179
  183 Owens Lake North 299 267
  189 Owens Lake South 360 225
 
Kern 125 Arvin-Edison 154 154
  146 Belridge 209 209
  054 Blackwells Corner 202 202
  138 Famoso 222 222
  005 Shafter/USDA 164 153
 
Kings 021 Kettleman 98 98
  015 Stratford 196 190
 
Lassen 057 Buntingville 472 242
 
Los Angeles 082 Claremont
  133 Glendale 22 22
  174 Long Beach 50 50
  159 Monrovia 8 8
  197 Palmdale 326 223
  078 Pomona 38 38
  204 Santa Clarita 18 2
  099 Santa Monica 0 0
 
Madera 145 Madera 242 212
 
Marin 187 Black Point 187 175
  157 Point San Pedro 187 187
 
Mendocino 085 Hopland FS 213 213
  106 Sanel Valley 299 235
 
Merced 092 Kesterson 174 156
  056 Los Banos 214 192
  148 Merced 312 266
 
Modoc 090 Alturas 530 263
 
Monterey 114 Arroyo Seco 257 241
  019 Castroville 211 211
  113 King City-Oasis Rd. 219 210
  129 Pajaro 111 111
  116 Salinas North 237 237
  089 Salinas South 195 189
 
Napa 109 Carneros 265 210
  077 Oakville 264 236
 
Orange 075 Irvine 0 0
 
Placer 195 Auburn 169 169
 
Riverside 135 Blythe NE 90 90
  118 Cathedral City 24 24
  200 Indio 2 87 30
  136 Oasis 12 12
  151 Ripley 102 102
  154 Salton Sea North
  062 Temecula 0 0
  137 Temecula East II 175 175
  044 U.C. Riverside 12 12
  179 Winchester 201 199
 
Sacramento 131 Fair Oaks 179 179
  140 Twitchell Island 191 187
 
San Benito 126 San Benito 196 190
  143 San Juan Valley 225 221
 
San Bernardino 134 Barstow NE 180 164
  199 Big Bear Lake 531 231
  192 Lake Arrowhead 432 228
  117 Victorville 221 179
 
San Diego 153 Escondido SPV 141 125
  173 La Jolla 0 0
  150 Miramar 20 20
  147 Otay Lake 10 10
  184 San Diego II 0 0
 
San Joaquin 166 Lodi West 225 205
  070 Manteca 166 146
  167 Tracy 112 112
 
San Luis Obispo 163 Atascadero 321 253
  202 Nipomo 60 60
  052 San Luis Obispo 57 57
  160 San Luis Obispo West 113 113
 
Santa Barbara 088 Cuyama 343 261
  094 Goleta Foothills 0 0
  107 Santa Barbara 10 10
  064 Santa Ynez 323 279
  165 Sisquoc 187 181
 
Santa Clara 132 Morgan Hill
 
Santa Cruz 104 De Laveaga 161 161
  111 Green Valley Road 154 154
 
Shasta 043 McArthur 557 304
 
Siskiyou 091 Tulelake FS 528 257
 
Solano 121 Dixon 145 145
  122 Hastings Tract
  123 Suisun Valley 197 195
  139 Winters 220 204
 
Sonoma 158 Bennett Valley 321 269
  144 Petaluma East 268 246
  083 Santa Rosa 285 203
  103 Windsor 298 218
 
Stanislaus 168 Denair
  071 Modesto 287 253
  194 Oakdale 190 186
  161 Patterson 143 143
 
Sutter 030 Nicolaus 246 232
 
Tehama 008 Gerber 146 141
 
Tulare 203 Alpaugh 264 214
  182 Delano 229 227
  086 Lindcove 152 152
  169 Porterville 254 248
 
Ventura 152 Camarillo 74 74
  156 Oxnard 4 4
  101 Piru
  198 Santa Paula 82 82
 
Yolo 155 Bryte 144 144
  006 Davis 113 110
  196 Esparto 116 116
  027 Zamora
 
Yuba 084 Browns Valley 73 73
 
 *  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