600
500
400
300
200
100
0
0.25
0.50
0.75
100
Streamflow Ratio
Figure 2. Distribution of streamflow ratios inferred from selected ice-affected periods
at St. John River at Dickey, Maine, gage from 1971 through 1993.
streamflow and climatolological data were analyzed. The periods included WY 197174, 197879,
and 198393; intervening periods were omitted owing to intervals of missing stage or climatololog-
ical data. Within the selected periods, 37.1% (2303 days) of the daily values were from ice-affected
conditions, as shown by streamflow ratios of less than 1. The distribution of streamflow ratios,
inferred by dividing published values by corresponding apparent values, is right skewed, with a
mode class of 0.15 (Fig. 2). For the selected periods, the minimum streamflow ratio was 0.014 and
the mean of ice-affected streamflow ratios was 0.23. The corresponding distribution of daily mean
air temperature values, computed as the average of the daily maximum and minimum values, on
days of ice effects is approximately symmetrically distributed with a mean of 9.4C (Fig. 3).
350
300
250
200
150
100
50
35
30
25
20
15
10
5
0
5
10
15
Average Air Temperature (C)
Figure 3. Distribution of average daily air temperatures at Fort Kent, Maine, during
selected ice-affected periods at St. John River at Dickey, Maine, gage from 1971 through
1993.
3
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