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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 48 48
  171 Union City 14 14
 
Amador 227 Plymouth 0 0
 
Butte 012 Durham 90 88
 
Colusa 032 Colusa 42 42
 
Contra Costa 047 Brentwood 23 23
  170 Concord 156 150
  213 El Cerrito 0 0
  178 Moraga 96 96
 
El Dorado 013 Camino 77 77
  228 Diamond Springs 68 68
 
Fresno 205 Coalinga 21 21
  007 Firebaugh/Telles 21 21
  190 Five Points South West 37 37
  002 FivePoints/WSFS USDA 43 43
  080 Fresno State 39 39
  142 Orange Cove 34 34
  124 Panoche 22 22
  039 Parlier 148 147
  105 Westlands 25 25
 
Imperial 041 Calipatria/Mulberry 24 24
  087 Meloland 7 7
  175 Palo Verde II 52 52
  128 Salton Sea East
  127 Salton Sea West
  068 Seeley 19 19
  201 UC-Andrade 9 9
  186 UC-San Luis 0 0
  181 Westmorland North 24 22
 
Inyo 035 Bishop 253 181
  183 Owens Lake North 152 144
  189 Owens Lake South 147 139
 
Kern 125 Arvin-Edison 21 21
  146 Belridge 25 25
  054 Blackwells Corner 19 19
  138 Famoso 22 22
  005 Shafter/USDA 168 165
 
Kings 021 Kettleman 1 1
  015 Stratford 34 34
 
Lassen 057 Buntingville 333 197
 
Los Angeles 216 Arleta 1 1
  215 Chatsworth 9 9
  133 Glendale 1 1
  174 Long Beach 27 27
  159 Monrovia 0 0
  197 Palmdale 135 115
  220 Palmdale Central 0 0
  078 Pomona 4 4
  204 Santa Clarita 9 9
  099 Santa Monica 0 0
  219 West Hills 9 9
 
Madera 145 Madera
  188 Madera II 45 45
 
Marin 187 Black Point 52 52
  157 Point San Pedro 24 24
 
Mendocino 085 Hopland FS 44 44
  106 Sanel Valley 103 101
 
Merced 092 Kesterson 91 89
  056 Los Banos 29 29
  148 Merced 81 81
 
Modoc 090 Alturas 366 257
 
Monterey 114 Arroyo Seco 16 16
  210 Carmel 0 0
  019 Castroville 47 47
  113 King City-Oasis Rd. 32 32
  193 Pacific Grove 0 0
  129 Pajaro 13 13
  116 Salinas North 9 9
  214 Salinas South II 9 9
 
Napa 109 Carneros 79 79
  077 Oakville 73 73
 
Orange 075 Irvine 0 0
 
Placer 195 Auburn 13 13
 
Riverside 135 Blythe NE 1 1
  118 Cathedral City 0 0
  200 Indio 2 3 3
  208 La Quinta II 0 0
  238 Moreno Valley 6 6
  136 Oasis 0 0
  240 Perris 56 56
  151 Ripley 33 33
  062 Temecula 0 0
  237 Temecula East III 0 0
  218 Thermal South 24 24
  044 U.C. Riverside 0 0
  179 Winchester 46 46
 
Sacramento 131 Fair Oaks 20 20
  140 Twitchell Island 0 0
 
San Benito 126 San Benito 17 17
  143 San Juan Valley 25 25
 
San Bernardino 134 Barstow NE
  199 Big Bear Lake 345 193
  233 Joshua Tree 0 0
  192 Lake Arrowhead 293 240
  117 Victorville 95 91
 
San Diego 207 Borrego Springs 31 31
  153 Escondido SPV 64 64
  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 0 0
  167 Tracy 19 19
 
San Luis Obispo 163 Atascadero 84 84
  202 Nipomo 26 26
  052 San Luis Obispo 0 0
  160 San Luis Obispo West 0 0
 
Santa Barbara 088 Cuyama 108 108
  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 78 78
  165 Sisquoc 33 33
 
Santa Clara 211 Gilroy 64 64
 
Santa Cruz 104 De Laveaga 23 23
  209 Watsonville West II 0 0
 
Shasta 043 McArthur 320 236
  224 Shasta College 63 54
 
Siskiyou 091 Tulelake FS 346 233
 
Solano 121 Dixon 129 129
  212 Hastings Tract East 51 51
  139 Winters 53 53
 
Sonoma 158 Bennett Valley 108 108
  144 Petaluma East 178 178
  083 Santa Rosa 112 111
  103 Windsor 115 115
 
Stanislaus 206 Denair 26 26
  071 Modesto 56 56
  194 Oakdale 38 38
  161 Patterson 53 53
 
Sutter 235 Verona 42 42
 
Tehama 008 Gerber
 
Tulare 203 Alpaugh 60 60
  182 Delano 26 26
  086 Lindcove 21 21
  169 Porterville 49 49
 
Ventura 152 Camarillo 1 1
  156 Oxnard 4 4
  198 Santa Paula 74 56
 
Yolo 155 Bryte 0 0
  006 Davis 2 2
  196 Esparto 5 5
  226 Woodland 0 0
 
Yuba 084 Browns Valley 11 11
 
 *  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