How to Read the
Monthly Summary Form

The Preliminary Local Climatological Data tables use what the National Weather Service refers to as the F-6 form. The form may be a little confusing to read at first. So, the following list should help to explain the meaning of each column.

Column 1DayThe day of the month.
Column 2MaxThe day's high temperature.
Column 3MinThe day's low temperature.
Column 4AvgThe day's average temperature.
Column 5DepThe average temperature's departure from normal.
Column 6aHDDHeating Degree Days (65 - Avg = # of HDD). Use when the average temperature (Avg) is less than 65.
Column 6bCDDCooling Degree Days (Avg - 65 = # of CDD). Use when the average temperature (Avg) is greater than 65.
Column 7WtrThe water equivalent of the day's precipitation.
Column 8SnwThe day's snowfall in inches.
Column 9DpthThe depth of the snow, measured at midnight in inches.
Column 10AvgThe average wind speed in miles per hour.
Column 11SpdThe fastest 2 minute wind speed (in mph).
Column 12DirThe average direction of the wind speed, using 360 degrees of a compass. Where 90 is a wind from the east, 360 a wind from the north, etc.
Column 13MinThe number of minutes of sunshine received during the day.
Column 14DayThe percentage of possible minutes of sunshine.
Column 15S-SThe sky condition from sunrise to sunset, reported to the nearest okta (nearest one-tenth of the sky.)
Column 16WxWeather (wx) codes for the day (see list of codes on bottom of summary).
Column 17SpdThe highest wind gust for the day (in mph).
Column 18DrThe direction of the day's peak wind gust.


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