Station pages
Help - Canadian station weather data and extreme winter events

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The station pages are intended to make available all the results for the various calculations using all the weather variables and indices for each station. On each station page the results are separated by weather variable then by index.

Tables at top of page
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• Top row with station attributes
• Station latitude, longitude, and elevation are shown. The label of each provides a link to the entry of that station in a table sorted by that attribute.
• The small Canadian flag provides a link to the map of all Canadian stations from which any station page may be selected.
• The small provincial or territorial flag on the right provides a link to a list of all stations for that province or territory from which a station page may be selected.

• Row showing station location
• The location of the station is shown by an orange star on both the national map and provincial/territorial map.
• The ten other stations nearest to that station are shown along with the distance and cardinal direction to each. The station name provides a link to the page for that station.

• Observations table
• Each weather variable TMAX, TMIN, TEMP, PRCP, SNOW, and RAIN has a row for the number of observations of that variable.
• The variable name in the table provides a link to jump down the station page to the data for that weather variable.
• Total observations are the number of observations from throughout the entire year over the period 1948-1997. There are 18263 days (and thus possible observations) over that period, and the percentage of those days with observations at the station is shown.
• Calculations were only performed using observations from only the months of the winter season (November, December, January, February, March) over the period 1948-1997. There are 7563 NDJFM days (and thus possible observations) over that period, and the percentage number and of those days with observations at the station is shown

Tables for weather variables
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• The number of winter observations of the weather variable over 1948-1997 are shown. The "by year" link opens a histogram showing how many observations were taken and how many events of interest occurred each winter. {Example of help page for observations by year} Also the mean value for the weather variable over all observations is shown. For precipitation data, this included days with zero amount. For temperature data, the standard deviation is also shown.

• The overall distribution link opens a histogram showing the number of days of different weather variable values. {Example of help page for overall distributions}. Also shown are histograms for only days during which the values of an index is considered extreme. {Example of help page for extreme index days weather variable distributions}

Tables for weather variables during an extreme index
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• This table shows the data for the weather variable of interest under extremes of the index of interest.

• Scatterplots showing the daily index value versus the weather variable value for the full record are available for all weather variables and the daily-defined NAM and PNA. {Example of help page for scatterplots}

• For temperature data one row is for extreme high temperature variable days and the other is for extreme low temperature variable days, while for precipitation data one row is for all days with that type of precipitation and the other is for extreme days of that type of precipitation variable. The thresholds for these events of interest are shown in the first column.

• The days column shows the number of days over the entire station record with such events of interest. The "by month" link at the top of the column opens a table showing how many of those events occurred during each winter month. {Example of help page for observations by month} For precipitation data, the mean amount for those event days is also shown.

• The columns fully in an index color concern the event days under extremes of that index. For the daily-defined NAM and PNA, the mean daily index values for those event days are shown. For all indices, the number of days with such events occurring when the index is extreme high and extreme low are shown. The ratio of events days under high:low index conditions is computed from those values. The color of the cell background is determined by which index extreme had more weather variable event days. Also, if the ratio number is followed by an asterisk (*), the ratio passed the test for statistical significance.

• Lastly, the "map" links provide a jump to the ratio maps for that weather variable and index, and the "table" links connect to the entry of that station in a table sorted by the magnitude of that ratio.

Tables for weather variables under two index extremes
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• This table involves days where more than one index is considered extreme. {Example of help page for 2 index extremes days}

• The "station table" link opens a table showing the data for that station under each combination of two index extremes. {See more on 2 index extremes tables}

• Also provided are links to maps for the weather variable under two index extremes. Choose one of the extremes given, and the link then allows selection of the second extreme.