Missouri Weather Stations
Definition of terms used in
Daily Weather Report and Hourly Weather Data
Max - refers to the highest value reported in the 24 hour period
Min - refers to the lowest value report in a 24 hours period
Avg - average value for the time period (hour, day)
Temp - temperature
Wind - speed of wind
Wind Dir - Wind direction in degrees (45 northeast, 90 east, 180 south, 270
RH or Rel Hum - relative humidity
Bare soil - a fallow seedbed
Corn residue soil - a soil surface covered with decaying corn stalks
Wheat residue soil - a soil surface covered with decaying wheat straw
vapor press - the pressure exerted by the water vapor in the air
Precip - amount of rain or melted snow or ice
Solar Rad - The total amount of energy received from the sun during the
daylight period for the day.
Potential evapotranspiration (PET) - a calculated value of the maximum daily
evaporation and transpiration, i.e. water loss from a surface. It is
expressed in term of the equivalent depth of water (inches).
Growing degree days (GDD) - A calculated index related to the rate of
development of a plant. The daily value is equal to the average
temperature for the day minus the minimum temperature for a particular
crop. The minimum temperatures used are 45, 50 and 55 degrees
Heating degree days (HDD) - A calculated index to the demand for heat in a
residence during the heating season. It is equal to the 65 degrees
Fahrenheit minus the average temperature for the day.
Cooling degree days (CDD) - A calculated index to the demand for cooling in a
residence during the warm season. It is equal to the average
temperature for the day minus 65 degrees Fahrenheit.
Livestock Heat Stress (HTI) - An index related to the heat stress on an animal
in terms of categories ranging from an "alert" to "emergency"
MM - missing value due to transmission or instrument error.
Calculated Weather Indices and
Accumulated Weather Summaries, Year to Date
Acc refers to the total accumulation of values for the past seven days.
Other terms and abbreviations are defined in Definition of Terms used in Daily
Weather Report and Hourly Weather Data.
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