Table 2 Estimates of annual and seasonal 99th percentile rainfall thresholds for 15-min, hourly (1-h) and daily (1-d) durations. Thresholds were estimated for the 30-year reference period from 1971–2000 using declustered 15-min, hourly, and daily rainfall time series.

From: Trends in extreme rainfall over the past 55 years suggest springtime subhourly rainfall extremes have intensified in Mahantango Creek, Pennsylvania

Duration

99th percentile precipitation threshold, mm (1971–2000)

Annual

Spring

Summer

Fall

Winter

15-min

10.2

7.6

15.2

9.4

2.5

1-h

15.2

12.7

23.0

15.2

7.6

1-d

35.6

35.6

40.6

39.9

27.9

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