Observations for

Lao Historical Temperature Monitoring -- CCROM-ASEAN

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 to compute the heating degree days.

Seasonal daily statistics: Choose the seasonal diagnostic quantity (i.e the statistic of the daily data) to be computed for each season, from the following choices.
Minimum and Maximum Temperature: average minimum or maximum daily temperature over the season.
Heating Degree Days: Heating degree days are summations of negative 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.

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.

Dataset Documentation

Data: CCROM-ASEAN network of meteorological stations here.


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