Hourly Data: By default, the page will display all data for a given time period.Observation Type: The page will display coded Meteorological Aerodrome Reports (METAR), and Special Reports (SPECI).Gather Historical Data: When 'On' is checked, you will be able to select the starting and ending dates you are interested in getting data for (limit of 30 days).See Chart: Toggle 'on' or 'off' the data chart.Page Headers: Select how much of the 'top' of the page you'd like to see.Number of hours: Up to 720 hours (30 days) of data can be displayed on this page.Units of measurement: toggle between 'standard (with speeds in mph)', 'standard (with speeds in knots)' and 'metric' measurements.Mouse over Chart Headings to reveal Magnifying Glass, Then Click for ChartĬlicking the 'Settings' icon will open an area where you can select different viewing parameters. Note: Data availability varies by station. The following weather elements are available for viewing in a chart. If a 'magnifying glass' cursor appears, it means that if you click on that heading, data for that element will load into the chart. To view charts for additional elements, using a mouse, move the cursor over the element headings. Example 2: A station that reports 4 times an hour will begin trimming data after 250 hours.After 76 hours, data will be trimmed in the chart. Example 1: A NWS ASOS reports 12 - 13 times an hour.If you require high resolution charts, the 'Historical Data' option will be helpful. Therefore, data will be trimmed when it exceeds 1000 datapoints, and will then display every 2nd, 3rd, etc point. For longer duration datasets, with multiple reports per hour, this will exceed the charting capability. The chart has a limitation where 1000 data points per element can be displayed. If a station has not reported any of those elements during the requested period, no chart will be available. The default station chart contains Temperature, Dew Point Temperature, and Relative Humidity.

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