Heat Stress Monitoring. Management Information System) weather stations. Modified Chill Hours, & Chill Units (Utah Model) Hours below 45° F model Hours between 32° F and 45° F model. Chill Hours (sometimes called Chill Units) are an approximation of how many hours of weather between 32 degrees and 45 degrees (F) a plant requires to properly go dormant so it can wake up and blossom and/or set fruit. The map is not exact, and Mother Nature can always change her mind from one year to the next, but it can be used to estimate the chill hours for your area. Weather Stations. Select a station from drop down list below ... Average Chilling Hours Calculator. Chill Hours Map. Monitoring. Utah model. About CIMIS Weather Stations Prune Chilling Prediction Model Nitrogen Prediction Models for Almond & Pistachio ... Chill Hours, Modified Chill Hours, & Chill Units (Utah Model) Hours below 45° F Hours between 32° F and 45° F September 1 through August 31. September 1 through August 31. Citrus Advisory System. Cotton Pest in Florida. Citrus Copper Application Scheduler. Chill Hours Calculator. Some plants, like fruit trees and certain flowers, require a minimum number of chill hours to thrive. The chill hours for a region are below and between the line on the map and the next line down. Home. The chill hour map seen below is a result of research done at the University of Maryland. View Station Map . Blueberry Advisory System. There are 4 CIMIS weather stations located in Contra Costa County – Brentwood, Concord, Moraga, and El Cerrito. Strawberry Advisory System. Alameda; Amador; Butte; Colusa; Contra Costa; El Dorado; Fresno; Imperial; Inyo; Kern; Kings The weather station problem. : Method 2: Chilling hours were calculated by counting the number of hours at or below 45 degrees F, from October 1st through February 28th/29th. Pests and Diseases. Most weather stations are cluttered, complicated, and frustrating to install and maintain. Freeze Risk Probabilities. Crop Yield & Development. Climatology – Caribbean. Wiring and programming all the components can be a nightmare, and finding room to mount everything can be a challenge.. All-in-one weather stations solve many of these problems, but the tradeoff is flexibility. There is no weather station located in the western part of Contra Costa County (Richmond area), so the chill hours for that area can be approximated by data measured by the former Oakland Hills (Alameda County) CIMIS station. Climate. A how-to guide (pdf) by Kitren Glozer, retired Project Scientist, Dept. : Historical Date of First and Last Frost and Chilling Hour Data Weather Stations. Climatology – USA. Tools. Dynamic Model & Chill Portions Accumulation Guide. Cumulative Chilling Hours Please select a station from the list. Calculating Chilling Hours: Method 1: Chilling hours were calculated by counting the number of hours between 32 and 45 degrees F, from October 1st through February 28th/29th. Rainfall and Temp. Harvest Prediction Model: for Peaches, Plums and Nectarines.