Record envelope, standing records and threshold days for Long Falls Dam (USC00174781), Maine, United States, with 61 years of record.
Key Facts for Long Falls Dam
Long Falls Dam (USC00174781) is a weather station in Maine, United States at 45.22 latitude and -70.20 longitude, 354 m (1,160 ft) above sea level.
The station reports from 1953 to 2013, 61 years of record.
1,464 records set at Long Falls Dam still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Long Falls Dam set a daily record low maximum temperature of -8.3 C (17.1 F) on 25 November 2013.
About the Station
Location: Maine, United States, 45.22 latitude, -70.20 longitude.
Elevation: 354 m (1,160 ft).
Period of record: 1953 to 2013, 61 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 Long Falls 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 Long Falls 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)
-38.3 C (-36.9 F)
n/a
n/a
Feb
15.6 C (60.1 F)
-38.3 C (-36.9 F)
n/a
n/a
Mar
25.6 C (78.1 F)
-30.6 C (-23.1 F)
n/a
n/a
Apr
28.3 C (82.9 F)
-22.8 C (-9.0 F)
n/a
n/a
May
32.2 C (90.0 F)
-6.7 C (19.9 F)
n/a
n/a
Jun
33.9 C (93.0 F)
-1.7 C (28.9 F)
n/a
n/a
Jul
34.4 C (93.9 F)
1.1 C (34.0 F)
n/a
n/a
Aug
36.7 C (98.1 F)
-1.1 C (30.0 F)
n/a
n/a
Sep
34.4 C (93.9 F)
-6.7 C (19.9 F)
n/a
n/a
Oct
26.7 C (80.1 F)
-10.0 C (14.0 F)
n/a
n/a
Nov
20.0 C (68.0 F)
-22.8 C (-9.0 F)
n/a
n/a
Dec
17.2 C (63.0 F)
-31.7 C (-25.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Long Falls Dam still stand. 1956 holds the most, with 44.
Standing records at Long Falls Dam by the year they were set
Year set
Standing records
1953
17
1954
19
1955
29
1956
44
1957
40
1958
26
1959
28
1960
11
1961
19
1962
21
1963
40
1964
35
1965
27
1966
38
1967
27
1968
36
1969
21
1970
19
1971
25
1972
25
1973
22
1974
28
1975
22
1976
31
1977
27
1978
22
1979
36
1980
6
1981
32
1982
19
1983
19
1984
37
1985
11
1986
32
1987
22
1988
20
1989
30
1990
34
1991
25
1992
22
1993
25
1994
22
1995
26
1996
19
1997
8
1998
13
1999
23
2000
11
2001
22
2002
31
2003
31
2004
11
2005
18
2006
10
2007
27
2008
20
2009
19
2010
23
2011
18
2012
24
2013
19
All-Time Record Progression
5 new records
5 all-time records were set at Long Falls Dam between 1 April 1987 and 29 August 2011. Each dot is a new record.
When Long Falls Dam set new all-time records
Date
Kind
Detail
1987-04-01
Record daily precipitation
Record daily precipitation 90.7 mm (3.6 in)
1991-08-20
Record daily precipitation
Record daily precipitation 96.8 mm (3.8 in)
1999-09-17
Record daily precipitation
Record daily precipitation 99.8 mm (3.9 in)
2000-12-21
Record daily precipitation
Record daily precipitation 106.7 mm (4.2 in)
2011-08-29
Record daily precipitation
Record daily precipitation 113.3 mm (4.5 in)
Wettest Day of Each Month
Aug: 113.3 mm (4.5 in)
The wettest day on record for each calendar month at Long Falls Dam. The most was 113.3 mm (4.5 in) on 29 August 2011.
Record daily precipitation for each month at Long Falls Dam
Month
Record daily precipitation (mm)
Date
Jan
68.6 mm (2.7 in)
26 January 1986
Feb
66.8 mm (2.6 in)
26 February 1969
Mar
53.1 mm (2.1 in)
23 March 2001
Apr
90.7 mm (3.6 in)
1 April 1987
May
57.7 mm (2.3 in)
28 May 2011
Jun
67.6 mm (2.7 in)
27 June 2009
Jul
64.0 mm (2.5 in)
14 July 1996
Aug
113.3 mm (4.5 in)
29 August 2011
Sep
99.8 mm (3.9 in)
17 September 1999
Oct
70.1 mm (2.8 in)
22 October 1995
Nov
83.1 mm (3.3 in)
26 November 2008
Dec
106.7 mm (4.2 in)
21 December 2000
Period of Record Coverage
1953 to 2013
Complete yearUnder 90 percent of days
61 years of record at Long Falls Dam, 1953 to 2013. 3 years have data for under 90 percent of days and are left out of rankings: 1953, 1980, 1982.
Cooler than the station meanWarmer than the station mean
One stripe for each of 57 complete years at Long Falls Dam, 1954 to 2012. Blue stripes are years cooler than the station's own mean of 4.0 C (39.2 F); red stripes are warmer. The coolest year was 1972, at 2.7 C (36.8 F), and the warmest was 2012, at 6.0 C (42.8 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Long Falls Dam as warming stripes, 1954 to 2012
Year
Annual mean temperature
Difference from the station mean
1954
3.9 C
-0.07 C
1955
4.1 C
+0.07 C
1956
3.2 C
-0.82 C
1957
4.3 C
+0.32 C
1958
3.1 C
-0.86 C
1959
4.2 C
+0.15 C
1960
4.2 C
+0.17 C
1961
4.1 C
+0.06 C
1962
3.0 C
-1.03 C
1963
3.6 C
-0.38 C
1964
3.6 C
-0.38 C
1965
3.1 C
-0.86 C
1966
3.9 C
-0.14 C
1967
3.1 C
-0.90 C
1968
3.3 C
-0.72 C
1969
3.6 C
-0.43 C
1970
3.6 C
-0.44 C
1971
3.6 C
-0.42 C
1972
2.7 C
-1.31 C
1973
5.0 C
+1.04 C
1974
3.4 C
-0.59 C
1975
3.9 C
-0.14 C
1976
3.0 C
-1.03 C
1977
3.8 C
-0.19 C
1978
2.9 C
-1.09 C
1979
4.3 C
+0.31 C
1981
4.6 C
+0.64 C
1983
4.8 C
+0.75 C
1984
4.4 C
+0.43 C
1985
3.6 C
-0.45 C
1986
4.0 C
+0.01 C
1987
4.3 C
+0.32 C
1988
3.9 C
-0.10 C
1989
3.2 C
-0.83 C
1990
5.0 C
+0.99 C
1991
4.4 C
+0.43 C
1992
3.5 C
-0.54 C
1993
3.5 C
-0.50 C
1994
3.9 C
-0.12 C
1995
4.2 C
+0.18 C
1996
4.1 C
+0.11 C
1997
3.7 C
-0.34 C
1998
5.7 C
+1.73 C
1999
5.7 C
+1.66 C
2000
4.0 C
+0.03 C
2001
5.0 C
+1.02 C
2002
4.6 C
+0.63 C
2003
3.4 C
-0.57 C
2004
3.2 C
-0.78 C
2005
4.4 C
+0.35 C
2006
5.3 C
+1.34 C
2007
3.4 C
-0.65 C
2008
3.9 C
-0.14 C
2009
3.4 C
-0.64 C
2010
5.3 C
+1.33 C
2011
5.1 C
+1.12 C
2012
6.0 C
+2.01 C
The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1954 to 2012. In Fahrenheit: 0.3 F (0.1 to 0.5) per decade. The slope is a straight line fitted to 57 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Long Falls Dam
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.2 C (0.1 to 0.3) per decade
0.3 F (0.1 to 0.5) per decade
1954 to 2012
57
Rise
Mean daily maximum
0.10 C (0.00 to 0.21) per decade
0.19 F (0.00 to 0.37) per decade
1954 to 2012
57
Rise
Mean daily minimum
0.3 C (0.1 to 0.4) per decade
0.5 F (0.3 to 0.7) per decade
1954 to 2012
57
Rise
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
1953 to 2013
Yearly extremes at Long Falls Dam: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
36.7 C (98.1 F)
1975
31.7 C (89.1 F)
61
Coldest night (TNn)
-38.3 C (-36.9 F)
1962
-30.0 C (-22.0 F)
61
Wettest day (Rx1day)
113.3 mm (4.5 in)
2011
53.8 mm (2.1 in)
61
Wettest five days (Rx5day)
165.9 mm (6.5 in)
1969
90.7 mm (3.6 in)
61
Longest dry spell (CDD)
29 days
2001
17 days
61
Hottest day (TXx)
The hottest day of the year at Long Falls Dam, 1953 to 2013. The record is 36.7 C (98.1 F) in 1975, marked on the chart; the median year is 31.7 C (89.1 F).
Hottest day (TXx) at Long Falls Dam by year
Year
Hottest day (TXx)
1953
31.7 C (89.1 F)
1954
29.4 C (84.9 F)
1955
34.4 C (93.9 F)
1956
32.2 C (90.0 F)
1957
31.7 C (89.1 F)
1958
28.9 C (84.0 F)
1959
31.7 C (89.1 F)
1960
29.4 C (84.9 F)
1961
31.1 C (88.0 F)
1962
32.2 C (90.0 F)
1963
32.8 C (91.0 F)
1964
31.7 C (89.1 F)
1965
31.1 C (88.0 F)
1966
31.7 C (89.1 F)
1967
29.4 C (84.9 F)
1968
31.1 C (88.0 F)
1969
32.2 C (90.0 F)
1970
31.1 C (88.0 F)
1971
32.8 C (91.0 F)
1972
30.0 C (86.0 F)
1973
33.3 C (91.9 F)
1974
30.0 C (86.0 F)
1975
36.7 C (98.1 F)
1976
31.7 C (89.1 F)
1977
33.3 C (91.9 F)
1978
31.7 C (89.1 F)
1979
30.6 C (87.1 F)
1980
30.0 C (86.0 F)
1981
30.6 C (87.1 F)
1982
26.1 C (79.0 F)
1983
31.1 C (88.0 F)
1984
31.1 C (88.0 F)
1985
28.9 C (84.0 F)
1986
30.6 C (87.1 F)
1987
31.7 C (89.1 F)
1988
32.2 C (90.0 F)
1989
32.8 C (91.0 F)
1990
29.4 C (84.9 F)
1991
32.8 C (91.0 F)
1992
31.1 C (88.0 F)
1993
31.1 C (88.0 F)
1994
33.3 C (91.9 F)
1995
33.9 C (93.0 F)
1996
29.4 C (84.9 F)
1997
32.8 C (91.0 F)
1998
32.2 C (90.0 F)
1999
33.3 C (91.9 F)
2000
29.4 C (84.9 F)
2001
32.8 C (91.0 F)
2002
34.4 C (93.9 F)
2003
32.8 C (91.0 F)
2004
27.8 C (82.0 F)
2005
32.2 C (90.0 F)
2006
31.7 C (89.1 F)
2007
31.1 C (88.0 F)
2008
31.1 C (88.0 F)
2009
30.6 C (87.1 F)
2010
31.7 C (89.1 F)
2011
32.2 C (90.0 F)
2012
32.8 C (91.0 F)
2013
32.8 C (91.0 F)
Coldest night (TNn)
The coldest night of the year at Long Falls Dam, 1953 to 2013. The record is -38.3 C (-36.9 F) in 1962, marked on the chart; the median year is -30.0 C (-22.0 F).
Coldest night (TNn) at Long Falls Dam by year
Year
Coldest night (TNn)
1953
-20.6 C (-5.1 F)
1954
-28.3 C (-18.9 F)
1955
-32.2 C (-26.0 F)
1956
-28.9 C (-20.0 F)
1957
-35.6 C (-32.1 F)
1958
-32.2 C (-26.0 F)
1959
-28.9 C (-20.0 F)
1960
-30.0 C (-22.0 F)
1961
-31.7 C (-25.1 F)
1962
-38.3 C (-36.9 F)
1963
-31.1 C (-24.0 F)
1964
-28.9 C (-20.0 F)
1965
-31.1 C (-24.0 F)
1966
-29.4 C (-20.9 F)
1967
-32.8 C (-27.0 F)
1968
-31.1 C (-24.0 F)
1969
-27.8 C (-18.0 F)
1970
-31.7 C (-25.1 F)
1971
-35.6 C (-32.1 F)
1972
-38.3 C (-36.9 F)
1973
-29.4 C (-20.9 F)
1974
-32.2 C (-26.0 F)
1975
-31.1 C (-24.0 F)
1976
-33.3 C (-27.9 F)
1977
-27.8 C (-18.0 F)
1978
-28.3 C (-18.9 F)
1979
-31.7 C (-25.1 F)
1980
-22.2 C (-8.0 F)
1981
-33.3 C (-27.9 F)
1982
-30.0 C (-22.0 F)
1983
-26.7 C (-16.1 F)
1984
-33.9 C (-29.0 F)
1985
-25.6 C (-14.1 F)
1986
-26.7 C (-16.1 F)
1987
-28.3 C (-18.9 F)
1988
-30.0 C (-22.0 F)
1989
-31.7 C (-25.1 F)
1990
-25.6 C (-14.1 F)
1991
-28.3 C (-18.9 F)
1992
-27.8 C (-18.0 F)
1993
-33.9 C (-29.0 F)
1994
-36.7 C (-34.1 F)
1995
-36.1 C (-33.0 F)
1996
-28.9 C (-20.0 F)
1997
-30.6 C (-23.1 F)
1998
-31.1 C (-24.0 F)
1999
-30.6 C (-23.1 F)
2000
-30.0 C (-22.0 F)
2001
-28.3 C (-18.9 F)
2002
-23.3 C (-9.9 F)
2003
-30.6 C (-23.1 F)
2004
-31.1 C (-24.0 F)
2005
-28.3 C (-18.9 F)
2006
-22.2 C (-8.0 F)
2007
-27.8 C (-18.0 F)
2008
-30.6 C (-23.1 F)
2009
-34.4 C (-29.9 F)
2010
-25.0 C (-13.0 F)
2011
-30.6 C (-23.1 F)
2012
-28.9 C (-20.0 F)
2013
-26.7 C (-16.1 F)
Wettest day (Rx1day)
The wettest day of the year at Long Falls Dam, 1953 to 2013. The record is 113.3 mm (4.5 in) in 2011, marked on the chart; the median year is 53.8 mm (2.1 in).
Wettest day (Rx1day) at Long Falls Dam by year
Year
Wettest day (Rx1day)
1953
56.6 mm (2.2 in)
1954
77.5 mm (3.1 in)
1955
56.1 mm (2.2 in)
1956
36.6 mm (1.4 in)
1957
44.5 mm (1.8 in)
1958
43.7 mm (1.7 in)
1959
54.6 mm (2.1 in)
1960
84.3 mm (3.3 in)
1961
38.4 mm (1.5 in)
1962
59.7 mm (2.4 in)
1963
57.2 mm (2.3 in)
1964
33.0 mm (1.3 in)
1965
31.8 mm (1.3 in)
1966
47.5 mm (1.9 in)
1967
27.2 mm (1.1 in)
1968
50.3 mm (2.0 in)
1969
86.1 mm (3.4 in)
1970
44.5 mm (1.8 in)
1971
42.4 mm (1.7 in)
1972
45.7 mm (1.8 in)
1973
61.0 mm (2.4 in)
1974
41.4 mm (1.6 in)
1975
35.6 mm (1.4 in)
1976
59.4 mm (2.3 in)
1977
49.0 mm (1.9 in)
1978
56.9 mm (2.2 in)
1979
39.6 mm (1.6 in)
1980
21.6 mm (0.9 in)
1981
57.4 mm (2.3 in)
1982
44.2 mm (1.7 in)
1983
39.6 mm (1.6 in)
1984
53.8 mm (2.1 in)
1985
48.0 mm (1.9 in)
1986
68.6 mm (2.7 in)
1987
90.7 mm (3.6 in)
1988
58.9 mm (2.3 in)
1989
40.1 mm (1.6 in)
1990
46.5 mm (1.8 in)
1991
96.8 mm (3.8 in)
1992
59.2 mm (2.3 in)
1993
38.1 mm (1.5 in)
1994
54.4 mm (2.1 in)
1995
70.1 mm (2.8 in)
1996
64.0 mm (2.5 in)
1997
50.3 mm (2.0 in)
1998
55.4 mm (2.2 in)
1999
99.8 mm (3.9 in)
2000
106.7 mm (4.2 in)
2001
53.1 mm (2.1 in)
2002
41.7 mm (1.6 in)
2003
78.5 mm (3.1 in)
2004
50.3 mm (2.0 in)
2005
61.2 mm (2.4 in)
2006
53.8 mm (2.1 in)
2007
58.4 mm (2.3 in)
2008
83.1 mm (3.3 in)
2009
67.6 mm (2.7 in)
2010
66.8 mm (2.6 in)
2011
113.3 mm (4.5 in)
2012
47.5 mm (1.9 in)
2013
41.7 mm (1.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Long Falls Dam, 1953 to 2013. The record is 165.9 mm (6.5 in) in 1969, marked on the chart; the median year is 90.7 mm (3.6 in).
Wettest five days (Rx5day) at Long Falls Dam by year
Year
Wettest five days (Rx5day)
1953
98.8 mm (3.9 in)
1954
99.1 mm (3.9 in)
1955
80.8 mm (3.2 in)
1956
83.3 mm (3.3 in)
1957
66.4 mm (2.6 in)
1958
82.1 mm (3.2 in)
1959
90.7 mm (3.6 in)
1960
99.6 mm (3.9 in)
1961
69.4 mm (2.7 in)
1962
79.5 mm (3.1 in)
1963
124.0 mm (4.9 in)
1964
63.9 mm (2.5 in)
1965
50.1 mm (2.0 in)
1966
93.3 mm (3.7 in)
1967
58.4 mm (2.3 in)
1968
60.4 mm (2.4 in)
1969
165.9 mm (6.5 in)
1970
79.8 mm (3.1 in)
1971
70.3 mm (2.8 in)
1972
56.4 mm (2.2 in)
1973
129.6 mm (5.1 in)
1974
62.5 mm (2.5 in)
1975
48.1 mm (1.9 in)
1976
98.4 mm (3.9 in)
1977
85.6 mm (3.4 in)
1978
87.1 mm (3.4 in)
1979
93.2 mm (3.7 in)
1980
35.9 mm (1.4 in)
1981
112.3 mm (4.4 in)
1982
74.8 mm (2.9 in)
1983
71.2 mm (2.8 in)
1984
133.3 mm (5.2 in)
1985
82.8 mm (3.3 in)
1986
98.1 mm (3.9 in)
1987
109.5 mm (4.3 in)
1988
82.0 mm (3.2 in)
1989
83.0 mm (3.3 in)
1990
64.5 mm (2.5 in)
1991
118.5 mm (4.7 in)
1992
98.3 mm (3.9 in)
1993
57.7 mm (2.3 in)
1994
80.9 mm (3.2 in)
1995
127.0 mm (5.0 in)
1996
100.6 mm (4.0 in)
1997
74.5 mm (2.9 in)
1998
112.2 mm (4.4 in)
1999
142.2 mm (5.6 in)
2000
106.7 mm (4.2 in)
2001
58.2 mm (2.3 in)
2002
61.1 mm (2.4 in)
2003
123.0 mm (4.8 in)
2004
91.0 mm (3.6 in)
2005
97.3 mm (3.8 in)
2006
105.7 mm (4.2 in)
2007
108.3 mm (4.3 in)
2008
96.5 mm (3.8 in)
2009
100.9 mm (4.0 in)
2010
86.6 mm (3.4 in)
2011
128.3 mm (5.1 in)
2012
115.1 mm (4.5 in)
2013
121.7 mm (4.8 in)
Longest dry spell (CDD)
The longest dry spell of the year at Long Falls Dam, 1953 to 2013. The record is 29 days in 2001, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at Long Falls Dam by year
Year
Longest dry spell (CDD)
1953
17 days
1954
15 days
1955
14 days
1956
20 days
1957
17 days
1958
11 days
1959
18 days
1960
13 days
1961
24 days
1962
13 days
1963
18 days
1964
16 days
1965
15 days
1966
13 days
1967
13 days
1968
18 days
1969
15 days
1970
25 days
1971
17 days
1972
12 days
1973
14 days
1974
12 days
1975
13 days
1976
20 days
1977
15 days
1978
17 days
1979
22 days
1980
24 days
1981
21 days
1982
11 days
1983
13 days
1984
17 days
1985
13 days
1986
13 days
1987
20 days
1988
18 days
1989
14 days
1990
11 days
1991
12 days
1992
20 days
1993
17 days
1994
14 days
1995
16 days
1996
11 days
1997
20 days
1998
17 days
1999
17 days
2000
11 days
2001
29 days
2002
22 days
2003
21 days
2004
20 days
2005
13 days
2006
11 days
2007
17 days
2008
15 days
2009
24 days
2010
26 days
2011
13 days
2012
23 days
2013
18 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
57 years with a frost
Across 57 years with a frost, the median last spring frost at Long Falls Dam falls on 21 May and the median first autumn frost on 21 September, which leaves a median of 122 days between them.
Fitted over all years, the growing season changes by +3.5 days per decade at this station.
Frost dates and growing season at Long Falls Dam
Measure
Median, all years
Earliest period
Recent period (1983 to 2012)
Recent against earliest
Fitted trend
Last spring frost
21 May
n/a
20 May
n/a
-2.8 days per decade
First autumn frost
21 September
n/a
22 September
n/a
+0.7 days per decade
Growing days
122 days
n/a
125 days
n/a
+3.5 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
59 years, 1953 to 2013
A day with at least 53.2 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 124.8 mm (4.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Long Falls 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
53.2 mm (2.1 in)
5 years
69.8 mm (2.7 in)
10 years
81.7 mm (3.2 in)
25 years
98.0 mm (3.9 in)
50 years
111.1 mm (4.4 in)
100 years
124.8 mm (4.9 in)
Longer than the 59 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, 59 years of values from 1953 to 2013.
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: 113.3 mm (4.5 in) in 2011; 106.7 mm (4.2 in) in 2000; 99.8 mm (3.9 in) in 1999.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Long Falls Dam, at 2003. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 2003 ran 0.2 C (0.4 F) lower than in the years before (possible change).
Suspected changes in the annual mean temperature at Long Falls Dam, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
2003
-0.2
-0.4
possible
5
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
Data for Long Falls Dam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Long Falls 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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.