SPDSS_Task53-2_Collect and Fill Missing Monthly Climate Data

• Title: SPDSS Task 53.2 - Collect and Fill Missing Monthly Climate Data
• Description: SPDSS Task 53.2 –Collect and Fill Missing Monthly Climate Data memo discusses the identification of and filling techniques for the key climate stations selected to represent climatic conditions throughout the South Platte, North Platte and Laramie River basins ‎(SPDSS study area)‎.
• Decision Support - Doc Type: Task Memorandum
• Date: 2/7/2005
• DSS Category: Consumptive Use
• DSS: South Platte
• Basin: South Platte
• Contract/PO #: C153954
• Grant Type: Non-Reimbursable
• Bill Number: SB01-157, HB02-1152, SB03-110, HB04-1221, SB05-084, HB06-1313, SB07-122
• Prepared By: Leonard Rice Engineering

3.2 Frost Dates
The first step in filling missing frost dates was to fill the daily minimum temperature data.
Generally, the same independent stations selected for filling mean monthly temperature data
were used in the regression of daily minimum temperature. In a few instances, the stations used
to fill the monthly temperature data could not completely fill the missing daily data. In these
instances, the next closest station was used to fill the daily data. The resulting range of R-values
was very similar to those produced from the monthly temperature regression, presented in Table
3. The frost dates were then calculated from the filled minimum daily temperature records.
Table 7 shows the average annual frost dates resulting from frost date selection using minimum
temperature regression. The TSTooI input command file used to fill minimum temperature data
and to compile the frost dates from all the stations is provided in Appendix B.
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