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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 0 0
  191 Pleasanton 8 8
  171 Union City 3 3
 
Butte 012 Durham 9 9
 
Colusa 032 Colusa 11 11
 
Contra Costa 047 Brentwood 0 0
  170 Concord 2 2
  178 Moraga 31 31
 
El Dorado 013 Camino 0 0
 
Fresno 007 Firebaugh/Telles 0 0
  190 Five Points South West 5 5
  002 FivePoints/WSFS USDA 9 9
  080 Fresno State 11 11
  142 Orange Cove 9 9
  124 Panoche 0 0
  039 Parlier 11 11
  105 Westlands 8 8
 
Glenn 061 Orland 9 9
 
Imperial 041 Calipatria/Mulberry 0 0
  087 Meloland 0 0
  175 Palo Verde II 8 8
  128 Salton Sea East 0 0
  127 Salton Sea West 0 0
  068 Seeley 0 0
  181 Westmorland North
 
Inyo 035 Bishop 53 41
  183 Owens Lake North 23 23
  189 Owens Lake South 37 35
 
Kern 125 Arvin-Edison 6 6
  146 Belridge 8 8
  054 Blackwells Corner 7 7
  138 Famoso 5 5
  005 Shafter/USDA 22 22
 
Kings 021 Kettleman 0 0
  015 Stratford 6 6
 
Lassen 057 Buntingville 52 28
 
Los Angeles 082 Claremont
  133 Glendale 0 0
  174 Long Beach 0 0
  159 Monrovia 0 0
  197 Palmdale 43 43
  078 Pomona 0 0
  204 Santa Clarita 0 0
  099 Santa Monica 0 0
 
Madera 145 Madera 11 11
 
Marin 187 Black Point 6 6
  157 Point San Pedro 0 0
 
Mendocino 085 Hopland FS 0 0
  106 Sanel Valley 26 26
 
Merced 092 Kesterson 19 19
  056 Los Banos 11 11
  148 Merced 32 32
 
Modoc 090 Alturas 59 26
 
Monterey 114 Arroyo Seco 14 14
  019 Castroville 6 6
  113 King City-Oasis Rd. 6 6
  129 Pajaro 1 1
  116 Salinas North 9 9
  089 Salinas South 6 6
 
Napa 109 Carneros 12 12
  077 Oakville 5 5
 
Orange 075 Irvine 0 0
 
Placer 195 Auburn 0 0
 
Riverside 135 Blythe NE 0 0
  118 Cathedral City 0 0
  200 Indio 2 5 0
  136 Oasis 0 0
  151 Ripley 0 0
  154 Salton Sea North
  062 Temecula 0 0
  137 Temecula East II 4 4
  044 U.C. Riverside 0 0
  179 Winchester 20 20
 
Sacramento 131 Fair Oaks 0 0
  140 Twitchell Island 26 26
 
San Benito 126 San Benito 1 1
  143 San Juan Valley 7 7
 
San Bernardino 134 Barstow NE 4 4
  199 Big Bear Lake 70 44
  192 Lake Arrowhead 48 32
  117 Victorville 14 14
 
San Diego 153 Escondido SPV 24 24
  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 4 4
  070 Manteca 4 4
  167 Tracy 1 1
 
San Luis Obispo 163 Atascadero 7 7
  202 Nipomo 0 0
  052 San Luis Obispo 0 0
  160 San Luis Obispo West 0 0
 
Santa Barbara 088 Cuyama 37 37
  094 Goleta Foothills 0 0
  107 Santa Barbara 0 0
  064 Santa Ynez 42 42
  165 Sisquoc 17 17
 
Santa Clara 132 Morgan Hill
 
Santa Cruz 104 De Laveaga 0 0
  111 Green Valley Road 1 1
 
Shasta 043 McArthur 64 32
 
Siskiyou 091 Tulelake FS 56 25
 
Solano 121 Dixon 0 0
  122 Hastings Tract
  123 Suisun Valley 3 3
  139 Winters 1 1
 
Sonoma 158 Bennett Valley 26 26
  144 Petaluma East 11 11
  083 Santa Rosa 25 25
  103 Windsor 22 22
 
Stanislaus 168 Denair
  071 Modesto 29 29
  194 Oakdale 0 0
  161 Patterson 0 0
 
Sutter 030 Nicolaus 15 15
 
Tehama 008 Gerber 4 4
 
Tulare 203 Alpaugh 24 24
  182 Delano 13 13
  086 Lindcove 6 6
  169 Porterville 21 21
 
Ventura 152 Camarillo 0 0
  156 Oxnard 0 0
  101 Piru
  198 Santa Paula 1 1
 
Yolo 155 Bryte 0 0
  006 Davis 1 1
  196 Esparto 0 0
  027 Zamora
 
Yuba 084 Browns Valley 0 0
 
 *  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