![]() ![]() This value represents the threshold for which 30 percent of precipitation amounts will be greater than or equal to the value shown. "30% Chance More Than" Values for Monthly Precipitation and Annual Precipitation (Column 7) Accordingly, monthly totals are used to calculate the monthly threshold values and annual totals are used to calculate the annual threshold values. all January totals) and annual precipitation totals possess different statistical distributions which must be modeled separately with the gamma distribution. It should be noted that the annual threshold shown in Column 6 is not the sum of the individual monthly thresholds. These thresholds are calculated from the fitted two-parameter gamma distributions ( Soil Conservation Service, 1985). Viewed inversely, 70 percent of all precipitation amounts can be expected to exceed this value. This value represents the threshold for which 30 percent of precipitation amounts will be less than or equal to the value shown. "30% Chance Less Than" Values for Monthly Precipitation and Annual Precipitation (Column 6) The Yearly Total is the sum of the averages for individual months shown in Column 5. All monthly amounts are then summed and divided by the number of months used in the period (years) selected. Monthly precipitation is calculated by summing the daily precipitation for each month. The WETS Table uses daily precipitation to determine average monthly precipitation. ![]() Average Monthly and Annual Precipitation (Column 5) The value represents the average over the period selected. The value represents the average over the period selected.Īverage Daily Temperature for a Month and Yearly Average (Column 4)Īverage daily temperature for a month is calculated by adding the individual monthly average daily maximum temperatures and average daily minimum temperatures shown in columns 2 and 3 and dividing by two.Īverage yearly temperature is calculated by summing the monthly averages shown in Column 4 and dividing by 12. The yearly average is calculated by summing the monthly average minimums and dividing by 12. The monthly averages are then summed and divided by the number of months used in the period (years) selected. Average Daily Minimum Temperature for a Month and Yearly Average (Column 3)Īverage daily minimum temperatures are calculated by summing the daily minimum temperatures for an individual month and dividing by the number of values used in the summation for that month. The yearly average is calculated by summing the monthly average maximums and dividing by 12. The WETS table uses daily maximum (TMAX) and minimum (TMIN) observations to calculate average daily maximum and minimum temperatures for each month.Īverage daily maximum temperatures are calculated by summing the daily maximum temperatures for an individual month and dividing by the number of values used in the summation for that month. An example follows.Īverage Daily Maximum Temperature for a Month and Yearly Average (Column 2) The user has control over the starting and ending year and growing season threshold temperatures. The table can be generated from any NWS Cooperative Climate Station with 20 or more years of data. ![]() The table provides the normal range for monthly and annual precipitation and growing season dates required to assess the climatic characteristics for a geographic area over a representative time period. Rainfall totals are given for the past 7, 10, 14, 30, 60, and 90 days up to the current date, as well as the total for the current month, year, and previous year.The WETS program summarizes temperature and precipitation, growing season lengths, and last and first freezing dates. The Recent Rainfall table shows the total rainfall (in inches) for each Mesonet site. Add estimated values Mesonet Rainfall Totals (in inches)ĭata complete through 7:00 pm CDT Station Name ![]()
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