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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