Record envelope, standing records and threshold days for Squa Pan Dam (USC00178398), Maine, United States, with 73 years of record.
Key Facts for Squa Pan Dam
Squa Pan Dam (USC00178398) is a weather station in Maine, United States at 46.55 latitude and -68.33 longitude, 186 m (610 ft) above sea level.
The station reports from 1927 to 1999, 73 years of record.
1,464 records set at Squa Pan Dam still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Squa Pan Dam set a daily record high maximum temperature of 13.3 C (55.9 F) on 7 April 1999.
About the Station
Location: Maine, United States, 46.55 latitude, -68.33 longitude.
Elevation: 186 m (610 ft).
Period of record: 1927 to 1999, 73 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 days at or beyond a record
Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Squa Pan Dam. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Squa Pan Dam, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
13.3 C (55.9 F)
-42.2 C (-44.0 F)
n/a
n/a
Feb
18.3 C (64.9 F)
-42.8 C (-45.0 F)
n/a
n/a
Mar
22.2 C (72.0 F)
-41.1 C (-42.0 F)
n/a
n/a
Apr
28.9 C (84.0 F)
-25.6 C (-14.1 F)
n/a
n/a
May
34.4 C (93.9 F)
-12.2 C (10.0 F)
n/a
n/a
Jun
40.0 C (104.0 F)
-3.3 C (26.1 F)
n/a
n/a
Jul
36.7 C (98.1 F)
-1.7 C (28.9 F)
n/a
n/a
Aug
37.8 C (100.0 F)
-2.8 C (27.0 F)
n/a
n/a
Sep
34.4 C (93.9 F)
-7.2 C (19.0 F)
n/a
n/a
Oct
26.1 C (79.0 F)
-11.7 C (10.9 F)
n/a
n/a
Nov
20.6 C (69.1 F)
-26.7 C (-16.1 F)
n/a
n/a
Dec
15.6 C (60.1 F)
-38.9 C (-38.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Squa Pan Dam still stand. 1930 holds the most, with 54.
Standing records at Squa Pan Dam by the year they were set
Year set
Standing records
1928
2
1930
54
1931
13
1932
43
1933
45
1934
54
1935
28
1936
43
1937
13
1938
34
1939
19
1940
17
1941
12
1942
34
1943
19
1944
26
1945
41
1946
32
1947
44
1948
22
1956
1
1957
32
1958
14
1959
24
1960
20
1961
22
1962
15
1963
21
1964
34
1965
18
1966
30
1967
18
1968
24
1969
21
1970
23
1971
21
1972
31
1973
18
1974
28
1975
17
1976
30
1977
27
1978
22
1979
42
1980
9
1981
19
1982
28
1983
18
1984
16
1985
10
1986
20
1987
17
1988
15
1989
17
1990
17
1991
22
1992
11
1993
14
1994
21
1995
15
1996
18
1997
10
1998
14
1999
5
All-Time Record Progression
1 new records
1 all-time records were set at Squa Pan Dam between 18 January 1994 and 18 January 1994. Each dot is a new record.
When Squa Pan Dam set new all-time records
Date
Kind
Detail
1994-01-18
Record daily snowfall
Record daily snowfall 61.0 cm (24.0 in)
Wettest Day of Each Month
Sep: 116.3 mm (4.6 in)
The wettest day on record for each calendar month at Squa Pan Dam. The most was 116.3 mm (4.6 in) on 12 September 1954.
Record daily precipitation for each month at Squa Pan Dam
Month
Record daily precipitation (mm)
Date
Jan
59.9 mm (2.4 in)
28 January 1996
Feb
48.3 mm (1.9 in)
21 February 1929
Mar
39.1 mm (1.5 in)
18 March 1981
Apr
53.3 mm (2.1 in)
13 April 1940
May
53.1 mm (2.1 in)
17 May 1997
Jun
87.4 mm (3.4 in)
28 June 1954
Jul
90.4 mm (3.6 in)
6 July 1951
Aug
71.9 mm (2.8 in)
18 August 1958
Sep
116.3 mm (4.6 in)
12 September 1954
Oct
104.1 mm (4.1 in)
4 October 1970
Nov
86.4 mm (3.4 in)
5 November 1927
Dec
73.2 mm (2.9 in)
18 December 1973
Period of Record Coverage
1928 to 1999
Complete yearUnder 90 percent of days
64 years of record at Squa Pan Dam, 1928 to 1999. 28 years have data for under 90 percent of days and are left out of rankings: 1928, 1930, 1931, 1932, 1933, 1934, 1935, 1936 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 38 complete years at Squa Pan Dam, 1932 to 1991. Blue stripes are years cooler than the station's own mean of 2.9 C (37.2 F); red stripes are warmer. The coolest year was 1934, at 1.1 C (33.9 F), and the warmest was 1960, at 4.6 C (40.3 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Squa Pan Dam as warming stripes, 1932 to 1991
Year
Annual mean temperature
Difference from the station mean
1932
2.7 C
-0.26 C
1933
1.5 C
-1.42 C
1934
1.1 C
-1.86 C
1936
2.0 C
-0.92 C
1940
3.7 C
+0.76 C
1941
3.9 C
+0.96 C
1942
3.5 C
+0.63 C
1943
2.7 C
-0.18 C
1944
3.7 C
+0.83 C
1957
4.3 C
+1.37 C
1958
3.7 C
+0.80 C
1959
4.1 C
+1.22 C
1960
4.6 C
+1.69 C
1961
4.0 C
+1.05 C
1962
2.6 C
-0.27 C
1964
2.3 C
-0.64 C
1965
1.9 C
-1.00 C
1966
3.1 C
+0.20 C
1967
1.9 C
-1.01 C
1968
2.1 C
-0.83 C
1969
3.1 C
+0.22 C
1970
2.5 C
-0.42 C
1971
2.3 C
-0.62 C
1972
1.5 C
-1.46 C
1973
3.9 C
+0.94 C
1974
1.8 C
-1.11 C
1975
2.8 C
-0.12 C
1976
2.1 C
-0.80 C
1977
2.6 C
-0.27 C
1978
2.0 C
-0.93 C
1979
4.0 C
+1.07 C
1981
4.0 C
+1.10 C
1982
2.5 C
-0.40 C
1983
4.1 C
+1.17 C
1984
3.5 C
+0.60 C
1989
2.0 C
-0.94 C
1990
3.7 C
+0.75 C
1991
3.1 C
+0.15 C
The fitted trend in annual mean temperature here over 1932 to 1991 is 0.04 C (-0.14 to 0.23) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.3 to 0.4) per decade. The slope is a straight line fitted to 38 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Squa Pan Dam
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.04 C (-0.14 to 0.23) per decade
0.1 F (-0.3 to 0.4) per decade
1932 to 1991
38
Not clearly different from zero
Mean daily maximum
0.5 C (0.3 to 0.7) per decade
0.9 F (0.5 to 1.3) per decade
1932 to 1991
38
Rise
Mean daily minimum
-0.4 C (-0.7 to -0.2) per decade
-0.8 F (-1.2 to -0.4) per decade
1932 to 1991
38
Fall
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1927 to 1999
Yearly extremes at Squa Pan Dam: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
40.0 C (104.0 F)
1930
33.3 C (91.9 F)
64
Coldest night (TNn)
-42.8 C (-45.0 F)
1934
-36.7 C (-34.1 F)
64
Wettest day (Rx1day)
116.3 mm (4.6 in)
1954
45.7 mm (1.8 in)
73
Wettest five days (Rx5day)
128.2 mm (5.0 in)
1954
70.4 mm (2.8 in)
73
Longest dry spell (CDD)
26 days
1944
14 days
73
Hottest day (TXx)
The hottest day of the year at Squa Pan Dam, 1927 to 1999. The record is 40.0 C (104.0 F) in 1930, marked on the chart; the median year is 33.3 C (91.9 F).
Hottest day (TXx) at Squa Pan Dam by year
Year
Hottest day (TXx)
1927
n/a
1928
14.4 C (57.9 F)
1929
n/a
1930
40.0 C (104.0 F)
1931
32.2 C (90.0 F)
1932
26.7 C (80.1 F)
1933
26.7 C (80.1 F)
1934
27.2 C (81.0 F)
1935
29.4 C (84.9 F)
1936
27.8 C (82.0 F)
1937
33.9 C (93.0 F)
1938
33.9 C (93.0 F)
1939
34.4 C (93.9 F)
1940
31.7 C (89.1 F)
1941
33.9 C (93.0 F)
1942
33.9 C (93.0 F)
1943
35.6 C (96.1 F)
1944
37.8 C (100.0 F)
1945
35.6 C (96.1 F)
1946
34.4 C (93.9 F)
1947
36.7 C (98.1 F)
1948
26.7 C (80.1 F)
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
n/a
1954
n/a
1955
n/a
1956
20.6 C (69.1 F)
1957
33.3 C (91.9 F)
1958
31.1 C (88.0 F)
1959
33.9 C (93.0 F)
1960
33.3 C (91.9 F)
1961
32.8 C (91.0 F)
1962
31.7 C (89.1 F)
1963
33.9 C (93.0 F)
1964
34.4 C (93.9 F)
1965
32.8 C (91.0 F)
1966
31.1 C (88.0 F)
1967
33.3 C (91.9 F)
1968
33.9 C (93.0 F)
1969
33.9 C (93.0 F)
1970
33.3 C (91.9 F)
1971
31.7 C (89.1 F)
1972
32.2 C (90.0 F)
1973
32.8 C (91.0 F)
1974
31.7 C (89.1 F)
1975
35.6 C (96.1 F)
1976
34.4 C (93.9 F)
1977
34.4 C (93.9 F)
1978
33.3 C (91.9 F)
1979
32.2 C (90.0 F)
1980
31.1 C (88.0 F)
1981
31.7 C (89.1 F)
1982
33.3 C (91.9 F)
1983
34.4 C (93.9 F)
1984
33.3 C (91.9 F)
1985
30.6 C (87.1 F)
1986
30.6 C (87.1 F)
1987
32.2 C (90.0 F)
1988
35.0 C (95.0 F)
1989
35.6 C (96.1 F)
1990
32.2 C (90.0 F)
1991
35.6 C (96.1 F)
1992
34.4 C (93.9 F)
1993
33.9 C (93.0 F)
1994
33.3 C (91.9 F)
1995
34.4 C (93.9 F)
1996
33.9 C (93.0 F)
1997
32.8 C (91.0 F)
1998
32.8 C (91.0 F)
1999
16.1 C (61.0 F)
Coldest night (TNn)
The coldest night of the year at Squa Pan Dam, 1927 to 1999. The record is -42.8 C (-45.0 F) in 1934, marked on the chart; the median year is -36.7 C (-34.1 F).
Coldest night (TNn) at Squa Pan Dam by year
Year
Coldest night (TNn)
1927
n/a
1928
-22.2 C (-8.0 F)
1929
n/a
1930
-38.3 C (-36.9 F)
1931
-41.1 C (-42.0 F)
1932
-35.6 C (-32.1 F)
1933
-38.9 C (-38.0 F)
1934
-42.8 C (-45.0 F)
1935
-38.9 C (-38.0 F)
1936
-34.4 C (-29.9 F)
1937
-36.7 C (-34.1 F)
1938
-41.1 C (-42.0 F)
1939
-34.4 C (-29.9 F)
1940
-37.2 C (-35.0 F)
1941
-36.7 C (-34.1 F)
1942
-36.7 C (-34.1 F)
1943
-42.2 C (-44.0 F)
1944
-37.2 C (-35.0 F)
1945
-34.4 C (-29.9 F)
1946
-34.4 C (-29.9 F)
1947
-35.6 C (-32.1 F)
1948
-41.1 C (-42.0 F)
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
n/a
1954
n/a
1955
n/a
1956
-28.3 C (-18.9 F)
1957
-40.6 C (-41.1 F)
1958
-35.0 C (-31.0 F)
1959
-35.6 C (-32.1 F)
1960
-36.7 C (-34.1 F)
1961
-38.3 C (-36.9 F)
1962
-38.9 C (-38.0 F)
1963
-37.8 C (-36.0 F)
1964
-33.3 C (-27.9 F)
1965
-33.3 C (-27.9 F)
1966
-41.1 C (-42.0 F)
1967
-41.7 C (-43.1 F)
1968
-37.8 C (-36.0 F)
1969
-37.2 C (-35.0 F)
1970
-35.6 C (-32.1 F)
1971
-38.9 C (-38.0 F)
1972
-40.0 C (-40.0 F)
1973
-37.2 C (-35.0 F)
1974
-37.8 C (-36.0 F)
1975
-38.3 C (-36.9 F)
1976
-38.9 C (-38.0 F)
1977
-36.1 C (-33.0 F)
1978
-33.3 C (-27.9 F)
1979
-36.7 C (-34.1 F)
1980
-35.0 C (-31.0 F)
1981
-34.4 C (-29.9 F)
1982
-36.1 C (-33.0 F)
1983
-29.4 C (-20.9 F)
1984
-37.2 C (-35.0 F)
1985
-31.7 C (-25.1 F)
1986
-35.6 C (-32.1 F)
1987
-35.0 C (-31.0 F)
1988
-32.8 C (-27.0 F)
1989
-37.2 C (-35.0 F)
1990
-33.9 C (-29.0 F)
1991
-36.7 C (-34.1 F)
1992
-32.8 C (-27.0 F)
1993
-40.0 C (-40.0 F)
1994
-42.2 C (-44.0 F)
1995
-42.2 C (-44.0 F)
1996
-35.6 C (-32.1 F)
1997
-40.6 C (-41.1 F)
1998
-34.4 C (-29.9 F)
1999
-40.0 C (-40.0 F)
Wettest day (Rx1day)
The wettest day of the year at Squa Pan Dam, 1927 to 1999. The record is 116.3 mm (4.6 in) in 1954, marked on the chart; the median year is 45.7 mm (1.8 in).
Wettest day (Rx1day) at Squa Pan Dam by year
Year
Wettest day (Rx1day)
1927
86.4 mm (3.4 in)
1928
42.4 mm (1.7 in)
1929
48.3 mm (1.9 in)
1930
42.2 mm (1.7 in)
1931
58.7 mm (2.3 in)
1932
86.4 mm (3.4 in)
1933
27.7 mm (1.1 in)
1934
36.8 mm (1.4 in)
1935
24.1 mm (0.9 in)
1936
43.7 mm (1.7 in)
1937
45.7 mm (1.8 in)
1938
31.2 mm (1.2 in)
1939
31.8 mm (1.3 in)
1940
53.3 mm (2.1 in)
1941
42.7 mm (1.7 in)
1942
43.7 mm (1.7 in)
1943
52.3 mm (2.1 in)
1944
30.0 mm (1.2 in)
1945
50.8 mm (2.0 in)
1946
31.8 mm (1.3 in)
1947
28.2 mm (1.1 in)
1948
35.1 mm (1.4 in)
1949
53.3 mm (2.1 in)
1950
62.7 mm (2.5 in)
1951
90.4 mm (3.6 in)
1952
45.7 mm (1.8 in)
1953
45.2 mm (1.8 in)
1954
116.3 mm (4.6 in)
1955
36.8 mm (1.4 in)
1956
32.3 mm (1.3 in)
1957
49.0 mm (1.9 in)
1958
71.9 mm (2.8 in)
1959
71.1 mm (2.8 in)
1960
55.1 mm (2.2 in)
1961
54.4 mm (2.1 in)
1962
61.0 mm (2.4 in)
1963
38.6 mm (1.5 in)
1964
36.6 mm (1.4 in)
1965
35.6 mm (1.4 in)
1966
61.0 mm (2.4 in)
1967
45.7 mm (1.8 in)
1968
38.6 mm (1.5 in)
1969
46.7 mm (1.8 in)
1970
104.1 mm (4.1 in)
1971
36.1 mm (1.4 in)
1972
51.3 mm (2.0 in)
1973
73.2 mm (2.9 in)
1974
53.8 mm (2.1 in)
1975
32.3 mm (1.3 in)
1976
61.0 mm (2.4 in)
1977
47.0 mm (1.9 in)
1978
35.1 mm (1.4 in)
1979
48.3 mm (1.9 in)
1980
47.0 mm (1.9 in)
1981
55.9 mm (2.2 in)
1982
55.1 mm (2.2 in)
1983
43.9 mm (1.7 in)
1984
46.0 mm (1.8 in)
1985
28.4 mm (1.1 in)
1986
38.1 mm (1.5 in)
1987
34.8 mm (1.4 in)
1988
48.8 mm (1.9 in)
1989
40.6 mm (1.6 in)
1990
44.2 mm (1.7 in)
1991
44.7 mm (1.8 in)
1992
44.2 mm (1.7 in)
1993
55.1 mm (2.2 in)
1994
43.2 mm (1.7 in)
1995
46.7 mm (1.8 in)
1996
59.9 mm (2.4 in)
1997
53.1 mm (2.1 in)
1998
35.1 mm (1.4 in)
1999
28.2 mm (1.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Squa Pan Dam, 1927 to 1999. The record is 128.2 mm (5.0 in) in 1954, marked on the chart; the median year is 70.4 mm (2.8 in).
Wettest five days (Rx5day) at Squa Pan Dam by year
Year
Wettest five days (Rx5day)
1927
94.0 mm (3.7 in)
1928
68.1 mm (2.7 in)
1929
51.5 mm (2.0 in)
1930
67.1 mm (2.6 in)
1931
68.6 mm (2.7 in)
1932
112.1 mm (4.4 in)
1933
58.7 mm (2.3 in)
1934
55.2 mm (2.2 in)
1935
67.1 mm (2.6 in)
1936
60.8 mm (2.4 in)
1937
77.2 mm (3.0 in)
1938
55.3 mm (2.2 in)
1939
43.2 mm (1.7 in)
1940
77.5 mm (3.1 in)
1941
75.7 mm (3.0 in)
1942
98.6 mm (3.9 in)
1943
70.4 mm (2.8 in)
1944
61.5 mm (2.4 in)
1945
78.2 mm (3.1 in)
1946
58.2 mm (2.3 in)
1947
51.2 mm (2.0 in)
1948
65.6 mm (2.6 in)
1949
63.5 mm (2.5 in)
1950
87.9 mm (3.5 in)
1951
103.6 mm (4.1 in)
1952
103.9 mm (4.1 in)
1953
67.6 mm (2.7 in)
1954
128.2 mm (5.0 in)
1955
59.7 mm (2.4 in)
1956
48.8 mm (1.9 in)
1957
62.7 mm (2.5 in)
1958
115.9 mm (4.6 in)
1959
120.4 mm (4.7 in)
1960
80.7 mm (3.2 in)
1961
117.1 mm (4.6 in)
1962
88.3 mm (3.5 in)
1963
82.1 mm (3.2 in)
1964
78.0 mm (3.1 in)
1965
46.5 mm (1.8 in)
1966
68.1 mm (2.7 in)
1967
95.2 mm (3.7 in)
1968
65.6 mm (2.6 in)
1969
103.8 mm (4.1 in)
1970
119.4 mm (4.7 in)
1971
52.9 mm (2.1 in)
1972
84.1 mm (3.3 in)
1973
110.4 mm (4.3 in)
1974
61.2 mm (2.4 in)
1975
49.1 mm (1.9 in)
1976
93.7 mm (3.7 in)
1977
93.0 mm (3.7 in)
1978
54.2 mm (2.1 in)
1979
67.5 mm (2.7 in)
1980
56.2 mm (2.2 in)
1981
103.4 mm (4.1 in)
1982
63.6 mm (2.5 in)
1983
100.3 mm (3.9 in)
1984
107.3 mm (4.2 in)
1985
41.5 mm (1.6 in)
1986
56.4 mm (2.2 in)
1987
60.0 mm (2.4 in)
1988
75.0 mm (3.0 in)
1989
77.9 mm (3.1 in)
1990
85.4 mm (3.4 in)
1991
72.2 mm (2.8 in)
1992
67.2 mm (2.6 in)
1993
71.1 mm (2.8 in)
1994
61.8 mm (2.4 in)
1995
69.8 mm (2.7 in)
1996
77.2 mm (3.0 in)
1997
73.1 mm (2.9 in)
1998
76.7 mm (3.0 in)
1999
40.9 mm (1.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at Squa Pan Dam, 1927 to 1999. The record is 26 days in 1944, marked on the chart; the median year is 14 days.
Longest dry spell (CDD) at Squa Pan Dam by year
Year
Longest dry spell (CDD)
1927
7 days
1928
20 days
1929
10 days
1930
15 days
1931
12 days
1932
18 days
1933
14 days
1934
13 days
1935
15 days
1936
10 days
1937
19 days
1938
14 days
1939
17 days
1940
11 days
1941
14 days
1942
14 days
1943
13 days
1944
26 days
1945
18 days
1946
16 days
1947
19 days
1948
15 days
1949
12 days
1950
17 days
1951
12 days
1952
13 days
1953
9 days
1954
16 days
1955
17 days
1956
16 days
1957
16 days
1958
10 days
1959
12 days
1960
12 days
1961
17 days
1962
20 days
1963
13 days
1964
14 days
1965
12 days
1966
13 days
1967
13 days
1968
19 days
1969
11 days
1970
14 days
1971
15 days
1972
14 days
1973
16 days
1974
12 days
1975
13 days
1976
14 days
1977
13 days
1978
20 days
1979
15 days
1980
15 days
1981
13 days
1982
16 days
1983
16 days
1984
13 days
1985
18 days
1986
18 days
1987
20 days
1988
15 days
1989
16 days
1990
14 days
1991
15 days
1992
14 days
1993
16 days
1994
15 days
1995
13 days
1996
12 days
1997
14 days
1998
12 days
1999
10 days
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
38 years with a frost
Across 38 years with a frost, the median last spring frost at Squa Pan Dam falls on 7 June and the median first autumn frost on 3 September, which leaves a median of 85 days between them.
Fitted over all years, the growing season changes by -5.8 days per decade at this station.
Frost dates and growing season at Squa Pan Dam
Measure
Median, all years
Earliest period
Recent period (1944 to 1991)
Recent against earliest
Fitted trend
Last spring frost
7 June
n/a
9 June
n/a
+3.4 days per decade
First autumn frost
3 September
n/a
2 September
n/a
-2.4 days per decade
Growing days
85 days
n/a
80 days
n/a
-5.8 days per decade
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
53 years, 1932 to 1994
A day with at least 45.5 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 119.2 mm (4.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Squa Pan Dam: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
45.5 mm (1.8 in)
5 years
60.7 mm (2.4 in)
10 years
72.3 mm (2.8 in)
25 years
89.2 mm (3.5 in)
50 years
103.4 mm (4.1 in)
100 years
119.2 mm (4.7 in)
Longer than the 53 years of record
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 53 years of values from 1932 to 1994.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 116.3 mm (4.6 in) in 1954; 104.1 mm (4.1 in) in 1970; 90.4 mm (3.6 in) in 1951.
Download the Data
Data for Squa Pan Dam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Squa Pan Dam threshold days by year: CSV or JSON. Field meanings are on the data page.
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-14 (14 October 2026). Records are computed by this site and are not official.