The Maproom explores historical daily temperature by calculating simple seasonal statistics.

Many options can be specified to produce yearly time series of a chosen seasonal diagnostic of the daily temperature data. The user can then choose to map the mean, standard deviation or probability of exceeding a chosen threshold, over years; clicking on the map will then produce a local yearly time series of the chosen diagnostic.

**Years and Season**:
Specify the range of years over which to perform the analysis and choose the start
and end dates of the season , over which the diagnostics are to be performed.

**Seasonal Data Coverage**:
A minimum fraction of non-missing days per season can be required in order for the
seasonal diagnostic to be defined at that station — if this minimum threshold is not
met, then the seasonal diagnostic is assigned a missing value at that station, for
that season and year.

**Hot/Cold Day Definition**:
This threshold is used to define in Celsius degrees (non inclusive) the temperature
under which a day is considered cold if the minimum temperature is below it; or the
temperature above which a days is considered hot if the maximum temperature is above
it; or the reference temperature for to compute the heating degree days.
**Seasonal daily statistcis**: Choose the seasonal diagnostic quantity (i.e the statistic of the daily data) to
be computed for each season, from the following choices.
**Mean, Minimum and Maximum Temperature**: average mean, minimum or maximum daily temperature over the season.
**Heating and Cooling Degree Days**: Heating/Cooling degree days are summations of negative/positive differences between
the mean daily temperature and user-defined reference base temperature during the
season. The mean temperature is defined as the average of the minimum and the maximum.
**Number of Cold and Hot days**:
the number of cold or hot days during the season according to the user-defined threshold
and according respectively to the minumim temperature and the maximum temperature.

**Percentage of Data Available**: the percentage of days with non missing values within the season.

**Yearly seasonal statistics**: a choice of yearly statistics over the chosen season of the selected range of years
to produce the map among: the mean, the standard deviation, the probability of exceeding
a user specified threshold, the coefficient of variation and the value of a user specified
percentile.

**Data**: SMNH network of meteorological stations here.

Contact help@iri.columbia.edu with any technical questions or problems with this Map Room.