Monthly Climate Summaries
The monthly climate summaries provide daily climate data for all days in
a month. For Ithaca, the summarization period is currently the 24 hours ending at
8am on the date indicated. For example, the maximum temperature that is
provided for December 8th is the highest temperature that occurred between
8am on December 7th and 8am on December 8th.
The columns of data that are displayed are:
- Date - day of observation
- Max Temperature - maximum temperature recorded for the last 24 hours (degrees F)
- Min Temperature - minimum temperature recorded for the last 24 hours (degrees F)
- Avg Temperature - average temperature (average of max and min temperatures)
- Avg Temperature Departure - departure of the average temperature from the 30-year normal
- HDD - daily heating degree days (base 65)
- CDD - daily cooling degree days (base 65)
- Precipitation - liquid precipitation (rain and/or liquid equivalent of snow) (inches)
- Snowfall - daily snowfall (i.e. new snow) (inches)
- Snow Depth - depth of snow on the ground at the time of observation (inches)
- A normal is a 30-year average consisting of three consecutive decades as computed by the
National Climatic Date Center. The current normal period is 1981-2010.
- Values of "M" indicate missing data.
- A value of "T" indicates "a trace" (less than 0.01 inch of precipitation,
less than 0.1 inch of snowfall, or less than 1 inch for snow depth).
- These values are subject to change as additional quality control is performed.