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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 149 Oakland Foothills 103 103
  191 Pleasanton 170 161
  171 Union City 128 128
 
Butte 012 Durham 141 127
 
Colusa 032 Colusa 162 152
 
Contra Costa 047 Brentwood 101 101
  170 Concord 150 149
  178 Moraga 250 208
 
El Dorado 013 Camino 187 187
 
Fresno 007 Firebaugh/Telles 118 118
  190 Five Points South West 143 136
  002 FivePoints/WSFS USDA 157 144
  080 Fresno State 156 156
  142 Orange Cove 144 144
  124 Panoche 118 114
  039 Parlier 169 169
  105 Westlands 138 132
 
Glenn 061 Orland 156 137
 
Imperial 041 Calipatria/Mulberry 43 43
  087 Meloland 18 18
  175 Palo Verde II 83 76
  128 Salton Sea East 28 28
  127 Salton Sea West 0 0
  068 Seeley 33 33
  181 Westmorland North
 
Inyo 035 Bishop 327 156
  183 Owens Lake North 218 202
  189 Owens Lake South 271 193
 
Kern 125 Arvin-Edison 90 90
  146 Belridge 136 136
  054 Blackwells Corner 135 135
  138 Famoso 147 147
  005 Shafter/USDA 167 156
 
Kings 021 Kettleman 60 60
  015 Stratford 132 129
 
Lassen 057 Buntingville 363 194
 
Los Angeles 082 Claremont
  133 Glendale 11 11
  174 Long Beach 25 25
  159 Monrovia 4 4
  197 Palmdale 243 187
  078 Pomona 19 19
  204 Santa Clarita 0 0
  099 Santa Monica 0 0
 
Madera 145 Madera 184 169
 
Marin 187 Black Point 124 118
  157 Point San Pedro 127 127
 
Mendocino 085 Hopland FS 150 150
  106 Sanel Valley 217 177
 
Merced 092 Kesterson 189 171
  056 Los Banos 159 148
  148 Merced 246 223
 
Modoc 090 Alturas 432 213
 
Monterey 114 Arroyo Seco 195 187
  019 Castroville 153 153
  113 King City-Oasis Rd. 172 167
  129 Pajaro 94 94
  116 Salinas North 179 179
  089 Salinas South 138 135
 
Napa 109 Carneros 188 156
  077 Oakville 185 171
 
Orange 075 Irvine 0 0
 
Placer 195 Auburn 125 125
 
Riverside 135 Blythe NE 52 52
  118 Cathedral City 12 12
  200 Indio 2 54 15
  136 Oasis 6 6
  151 Ripley 58 58
  154 Salton Sea North
  062 Temecula 0 0
  137 Temecula East II 115 115
  044 U.C. Riverside 6 6
  179 Winchester 143 142
 
Sacramento 131 Fair Oaks 134 134
  140 Twitchell Island 143 141
 
San Benito 126 San Benito 139 136
  143 San Juan Valley 167 165
 
San Bernardino 134 Barstow NE 107 99
  199 Big Bear Lake 428 216
  192 Lake Arrowhead 334 204
  117 Victorville 145 124
 
San Diego 153 Escondido SPV 90 82
  173 La Jolla 0 0
  150 Miramar 10 10
  147 Otay Lake 5 5
  184 San Diego II 0 0
 
San Joaquin 166 Lodi West 164 154
  070 Manteca 122 112
  167 Tracy 71 71
 
San Luis Obispo 163 Atascadero 233 186
  202 Nipomo 30 30
  052 San Luis Obispo 29 29
  160 San Luis Obispo West 67 67
 
Santa Barbara 088 Cuyama 260 214
  094 Goleta Foothills 0 0
  107 Santa Barbara 7 7
  064 Santa Ynez 249 227
  165 Sisquoc 128 125
 
Santa Clara 132 Morgan Hill
 
Santa Cruz 104 De Laveaga 111 111
  111 Green Valley Road 106 106
 
Shasta 043 McArthur 436 254
 
Siskiyou 091 Tulelake FS 450 222
 
Solano 121 Dixon 104 104
  122 Hastings Tract
  123 Suisun Valley 129 128
  139 Winters 147 139
 
Sonoma 158 Bennett Valley 239 203
  144 Petaluma East 192 181
  083 Santa Rosa 207 154
  103 Windsor 212 163
 
Stanislaus 168 Denair
  071 Modesto 216 197
  194 Oakdale 137 135
  161 Patterson 101 101
 
Sutter 030 Nicolaus 177 168
 
Tehama 008 Gerber 156 151
 
Tulare 203 Alpaugh 193 168
  182 Delano 148 147
  086 Lindcove 89 89
  169 Porterville 170 167
 
Ventura 152 Camarillo 38 38
  156 Oxnard 2 2
  101 Piru
  198 Santa Paula 55 55
 
Yolo 155 Bryte 102 102
  006 Davis 128 119
  196 Esparto 72 72
  027 Zamora
 
Yuba 084 Browns Valley 54 54
 
 *  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