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Figure 5.--Plot showing dates of landslide events in relation to the first yearly occurrence of a 6-day moving average of daily maximum temperature greater thatn or equal to 58°F at the respective sites. As shown, a high percentage ofthe 27 landslide events (85%) occurred within 2 weeks after the first yearly occurrence of the 58°F threshold and all occurred within 3 weeks of its occurrence. Also, the graph shows that a high percentage occurred during the calendar period April 25 to May 31. Numbers are keyed to landslide events in Tables 1 and 2.
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