Francis E Walter Dam Weather Records (USC00363018)
Record envelope, standing records and threshold days for Francis E Walter Dam (USC00363018), Pennsylvania, United States, with 64 years of record.
Key Facts for Francis E Walter Dam
Francis E Walter Dam (USC00363018) is a weather station in Pennsylvania, United States at 41.12 latitude and -75.73 longitude, 460 m (1,509 ft) above sea level.
The station reports from 1963 to 2026, 64 years of record.
1,464 records set at Francis E Walter Dam still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Francis E Walter Dam tied a daily record low maximum temperature of 19.4 C (66.9 F) on 22 July 2026.
About the Station
Location: Pennsylvania, United States, 41.12 latitude, -75.73 longitude.
Elevation: 460 m (1,509 ft).
Period of record: 1963 to 2026, 64 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
6 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 Francis E Walter Dam. The lines show the 2026 daily maximum and minimum. 6 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Francis E Walter Dam, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
19.4 C (66.9 F)
-32.2 C (-26.0 F)
8.3 C (46.9 F)
-23.3 C (-9.9 F)
Feb
22.2 C (72.0 F)
-33.3 C (-27.9 F)
7.8 C (46.0 F)
-18.9 C (-2.0 F)
Mar
28.9 C (84.0 F)
-25.0 C (-13.0 F)
23.3 C (73.9 F)
-11.1 C (12.0 F)
Apr
32.2 C (90.0 F)
-15.6 C (3.9 F)
28.9 C (84.0 F)
-7.2 C (19.0 F)
May
35.0 C (95.0 F)
-6.1 C (21.0 F)
32.2 C (90.0 F)
-1.7 C (28.9 F)
Jun
34.4 C (93.9 F)
-2.8 C (27.0 F)
28.9 C (84.0 F)
2.8 C (37.0 F)
Jul
35.6 C (96.1 F)
-1.1 C (30.0 F)
32.8 C (91.0 F)
7.8 C (46.0 F)
Aug
36.7 C (98.1 F)
-0.6 C (30.9 F)
28.9 C (84.0 F)
9.4 C (48.9 F)
Sep
32.8 C (91.0 F)
-5.0 C (23.0 F)
22.8 C (73.0 F)
3.9 C (39.0 F)
Oct
30.0 C (86.0 F)
-11.7 C (10.9 F)
20.6 C (69.1 F)
8.3 C (46.9 F)
Nov
25.0 C (77.0 F)
-18.3 C (-0.9 F)
n/a
n/a
Dec
19.4 C (66.9 F)
-30.0 C (-22.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Francis E Walter Dam still stand. 1989 holds the most, with 52.
Standing records at Francis E Walter Dam by the year they were set
Year set
Standing records
1963
12
1964
37
1965
32
1966
28
1967
36
1968
18
1969
16
1970
20
1971
17
1972
23
1973
22
1974
29
1975
25
1976
45
1977
36
1978
10
1979
42
1980
26
1981
19
1982
30
1983
19
1984
36
1985
19
1986
23
1987
18
1988
36
1989
52
1990
39
1991
35
1992
15
1993
12
1994
5
1995
16
1996
18
1997
23
1998
33
1999
14
2000
18
2001
17
2002
17
2003
17
2004
10
2005
21
2006
23
2007
30
2008
7
2009
17
2010
29
2011
22
2012
19
2013
26
2014
15
2015
40
2016
31
2017
23
2018
23
2019
16
2020
19
2021
14
2022
13
2023
14
2024
25
2025
12
2026
10
All-Time Record Progression
4 new records
4 all-time records were set at Francis E Walter Dam between 30 August 2004 and 13 June 2010. Each dot is a new record.
When Francis E Walter Dam set new all-time records
Date
Kind
Detail
2004-08-30
Record high minimum temperature
Record high minimum temperature 21.7 C (71.1 F)
2005-07-18
Record high minimum temperature
Record high minimum temperature 22.8 C (73.0 F)
2006-08-03
Record high maximum temperature
Record high maximum temperature 36.7 C (98.1 F)
2010-06-13
Record high minimum temperature
Record high minimum temperature 24.4 C (75.9 F)
Wettest Day of Each Month
Jun: 169.4 mm (6.7 in)
The wettest day on record for each calendar month at Francis E Walter Dam. The most was 169.4 mm (6.7 in) on 15 June 1969.
Record daily precipitation for each month at Francis E Walter Dam
Month
Record daily precipitation (mm)
Date
Jan
66.8 mm (2.6 in)
9 January 1978
Feb
116.8 mm (4.6 in)
23 February 2001
Mar
58.9 mm (2.3 in)
15 March 1986
Apr
100.8 mm (4.0 in)
16 April 1983
May
80.3 mm (3.2 in)
29 May 1984
Jun
169.4 mm (6.7 in)
15 June 1969
Jul
104.6 mm (4.1 in)
15 July 2025
Aug
100.3 mm (3.9 in)
2 August 1973
Sep
138.2 mm (5.4 in)
17 September 1999
Oct
162.3 mm (6.4 in)
1 October 2010
Nov
109.5 mm (4.3 in)
9 November 1996
Dec
75.7 mm (3.0 in)
4 December 1990
Period of Record Coverage
1963 to 2026
Complete yearUnder 90 percent of days
64 years of record at Francis E Walter Dam, 1963 to 2026. 22 years have data for under 90 percent of days and are left out of rankings: 1963, 1968, 1969, 1970, 1971, 1972, 1973, 1993 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 40 complete years at Francis E Walter Dam, 1964 to 2025. Blue stripes are years cooler than the station's own mean of 7.7 C (45.9 F); red stripes are warmer. The coolest year was 1989, at 5.7 C (42.3 F), and the warmest was 2012, at 9.9 C (49.8 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Francis E Walter Dam as warming stripes, 1964 to 2025
Year
Annual mean temperature
Difference from the station mean
1964
7.3 C
-0.47 C
1965
6.8 C
-0.95 C
1966
6.8 C
-0.89 C
1967
6.9 C
-0.81 C
1974
7.4 C
-0.37 C
1975
7.8 C
+0.08 C
1976
6.6 C
-1.13 C
1977
7.2 C
-0.52 C
1978
6.5 C
-1.21 C
1979
7.5 C
-0.24 C
1980
7.1 C
-0.62 C
1981
7.3 C
-0.45 C
1982
7.1 C
-0.64 C
1983
7.8 C
+0.07 C
1984
7.6 C
-0.15 C
1985
7.7 C
-0.07 C
1986
7.7 C
-0.03 C
1987
7.7 C
-0.04 C
1988
6.6 C
-1.09 C
1989
5.7 C
-2.02 C
1990
6.7 C
-1.07 C
1991
6.3 C
-1.39 C
1992
6.9 C
-0.86 C
1997
6.6 C
-1.12 C
2010
9.1 C
+1.42 C
2011
9.1 C
+1.36 C
2012
9.9 C
+2.15 C
2013
8.5 C
+0.81 C
2014
7.2 C
-0.49 C
2015
8.6 C
+0.84 C
2016
8.7 C
+0.97 C
2017
8.5 C
+0.77 C
2018
8.2 C
+0.45 C
2019
8.1 C
+0.40 C
2020
9.0 C
+1.25 C
2021
9.0 C
+1.28 C
2022
8.4 C
+0.64 C
2023
9.4 C
+1.71 C
2024
9.6 C
+1.83 C
2025
8.4 C
+0.67 C
The annual mean temperature here has risen by 0.4 C (0.3 to 0.5) per decade over 1964 to 2025. In Fahrenheit: 0.7 F (0.5 to 0.9) per decade. The slope is a straight line fitted to 40 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Francis E Walter Dam
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.4 C (0.3 to 0.5) per decade
0.7 F (0.5 to 0.9) per decade
1964 to 2025
40
Rise
Mean daily maximum
0.3 C (0.2 to 0.4) per decade
0.5 F (0.3 to 0.7) per decade
1964 to 2025
40
Rise
Mean daily minimum
0.5 C (0.3 to 0.6) per decade
0.9 F (0.6 to 1.1) per decade
1964 to 2025
40
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
1963 to 2026
Yearly extremes at Francis E Walter 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)
2006
32.2 C (90.0 F)
64
Coldest night (TNn)
-33.3 C (-27.9 F)
1979
-24.1 C (-11.5 F)
64
Wettest day (Rx1day)
169.4 mm (6.7 in)
1969
63.6 mm (2.5 in)
64
Wettest five days (Rx5day)
208.0 mm (8.2 in)
1969
88.4 mm (3.5 in)
62
Longest dry spell (CDD)
27 days
1963
14 days
64
Hottest day (TXx)
The hottest day of the year at Francis E Walter Dam, 1963 to 2026. The record is 36.7 C (98.1 F) in 2006, marked on the chart; the median year is 32.2 C (90.0 F).
Hottest day (TXx) at Francis E Walter Dam by year
Year
Hottest day (TXx)
1963
27.8 C (82.0 F)
1964
32.8 C (91.0 F)
1965
31.7 C (89.1 F)
1966
35.6 C (96.1 F)
1967
32.2 C (90.0 F)
1968
31.7 C (89.1 F)
1969
32.2 C (90.0 F)
1970
30.6 C (87.1 F)
1971
31.1 C (88.0 F)
1972
31.1 C (88.0 F)
1973
32.8 C (91.0 F)
1974
31.1 C (88.0 F)
1975
33.3 C (91.9 F)
1976
32.2 C (90.0 F)
1977
32.2 C (90.0 F)
1978
32.8 C (91.0 F)
1979
31.1 C (88.0 F)
1980
33.9 C (93.0 F)
1981
32.2 C (90.0 F)
1982
31.7 C (89.1 F)
1983
32.2 C (90.0 F)
1984
33.3 C (91.9 F)
1985
32.8 C (91.0 F)
1986
31.7 C (89.1 F)
1987
32.8 C (91.0 F)
1988
35.6 C (96.1 F)
1989
31.1 C (88.0 F)
1990
32.2 C (90.0 F)
1991
30.6 C (87.1 F)
1992
31.1 C (88.0 F)
1993
32.2 C (90.0 F)
1994
20.6 C (69.1 F)
1995
35.0 C (95.0 F)
1996
28.3 C (82.9 F)
1997
31.1 C (88.0 F)
1998
33.3 C (91.9 F)
1999
34.4 C (93.9 F)
2000
31.7 C (89.1 F)
2001
34.4 C (93.9 F)
2002
34.4 C (93.9 F)
2003
30.6 C (87.1 F)
2004
31.7 C (89.1 F)
2005
35.6 C (96.1 F)
2006
36.7 C (98.1 F)
2007
33.9 C (93.0 F)
2008
32.2 C (90.0 F)
2009
32.2 C (90.0 F)
2010
35.0 C (95.0 F)
2011
35.6 C (96.1 F)
2012
33.9 C (93.0 F)
2013
32.8 C (91.0 F)
2014
30.6 C (87.1 F)
2015
31.7 C (89.1 F)
2016
35.0 C (95.0 F)
2017
31.1 C (88.0 F)
2018
32.8 C (91.0 F)
2019
31.1 C (88.0 F)
2020
32.2 C (90.0 F)
2021
32.2 C (90.0 F)
2022
32.2 C (90.0 F)
2023
33.3 C (91.9 F)
2024
34.4 C (93.9 F)
2025
33.3 C (91.9 F)
2026
32.8 C (91.0 F)
Coldest night (TNn)
The coldest night of the year at Francis E Walter Dam, 1963 to 2026. The record is -33.3 C (-27.9 F) in 1979, marked on the chart; the median year is -24.1 C (-11.5 F).
Coldest night (TNn) at Francis E Walter Dam by year
Year
Coldest night (TNn)
1963
-27.8 C (-18.0 F)
1964
-27.2 C (-17.0 F)
1965
-26.1 C (-15.0 F)
1966
-26.1 C (-15.0 F)
1967
-27.8 C (-18.0 F)
1968
-29.4 C (-20.9 F)
1969
-25.6 C (-14.1 F)
1970
-26.7 C (-16.1 F)
1971
-26.7 C (-16.1 F)
1972
-23.3 C (-9.9 F)
1973
-22.8 C (-9.0 F)
1974
-22.2 C (-8.0 F)
1975
-26.1 C (-15.0 F)
1976
-25.6 C (-14.1 F)
1977
-26.1 C (-15.0 F)
1978
-26.1 C (-15.0 F)
1979
-33.3 C (-27.9 F)
1980
-25.6 C (-14.1 F)
1981
-32.2 C (-26.0 F)
1982
-32.2 C (-26.0 F)
1983
-23.3 C (-9.9 F)
1984
-30.0 C (-22.0 F)
1985
-26.7 C (-16.1 F)
1986
-21.1 C (-6.0 F)
1987
-24.4 C (-11.9 F)
1988
-28.3 C (-18.9 F)
1989
-30.0 C (-22.0 F)
1990
-23.3 C (-9.9 F)
1991
-23.3 C (-9.9 F)
1992
-18.9 C (-2.0 F)
1993
-23.9 C (-11.0 F)
1994
-13.3 C (8.1 F)
1995
-23.9 C (-11.0 F)
1996
-26.1 C (-15.0 F)
1997
-24.4 C (-11.9 F)
1998
-21.7 C (-7.1 F)
1999
-21.1 C (-6.0 F)
2000
-20.0 C (-4.0 F)
2001
-20.6 C (-5.1 F)
2002
-17.8 C (0.0 F)
2003
-25.6 C (-14.1 F)
2004
-18.9 C (-2.0 F)
2005
-22.2 C (-8.0 F)
2006
-17.8 C (0.0 F)
2007
-22.8 C (-9.0 F)
2008
-20.0 C (-4.0 F)
2009
-27.2 C (-17.0 F)
2010
-17.8 C (0.0 F)
2011
-25.6 C (-14.1 F)
2012
-17.8 C (0.0 F)
2013
-20.0 C (-4.0 F)
2014
-25.0 C (-13.0 F)
2015
-27.8 C (-18.0 F)
2016
-23.3 C (-9.9 F)
2017
-18.3 C (-0.9 F)
2018
-23.3 C (-9.9 F)
2019
-25.6 C (-14.1 F)
2020
-19.4 C (-2.9 F)
2021
-16.7 C (1.9 F)
2022
-24.4 C (-11.9 F)
2023
-19.4 C (-2.9 F)
2024
-22.2 C (-8.0 F)
2025
-27.2 C (-17.0 F)
2026
-23.3 C (-9.9 F)
Wettest day (Rx1day)
The wettest day of the year at Francis E Walter Dam, 1963 to 2026. The record is 169.4 mm (6.7 in) in 1969, marked on the chart; the median year is 63.6 mm (2.5 in).
Wettest day (Rx1day) at Francis E Walter Dam by year
Year
Wettest day (Rx1day)
1963
38.9 mm (1.5 in)
1964
38.1 mm (1.5 in)
1965
35.3 mm (1.4 in)
1966
43.4 mm (1.7 in)
1967
48.8 mm (1.9 in)
1968
43.2 mm (1.7 in)
1969
169.4 mm (6.7 in)
1970
43.7 mm (1.7 in)
1971
44.5 mm (1.8 in)
1972
73.4 mm (2.9 in)
1973
130.8 mm (5.1 in)
1974
43.2 mm (1.7 in)
1975
62.2 mm (2.4 in)
1976
49.8 mm (2.0 in)
1977
72.9 mm (2.9 in)
1978
66.8 mm (2.6 in)
1979
66.8 mm (2.6 in)
1980
45.0 mm (1.8 in)
1981
54.9 mm (2.2 in)
1982
44.7 mm (1.8 in)
1983
100.8 mm (4.0 in)
1984
80.3 mm (3.2 in)
1985
101.6 mm (4.0 in)
1986
58.9 mm (2.3 in)
1987
77.2 mm (3.0 in)
1988
73.4 mm (2.9 in)
1989
68.8 mm (2.7 in)
1990
75.7 mm (3.0 in)
1991
76.7 mm (3.0 in)
1992
40.6 mm (1.6 in)
1993
76.2 mm (3.0 in)
1994
68.1 mm (2.7 in)
1995
52.1 mm (2.1 in)
1996
109.5 mm (4.3 in)
1997
47.5 mm (1.9 in)
1998
37.3 mm (1.5 in)
1999
138.2 mm (5.4 in)
2000
65.0 mm (2.6 in)
2001
116.8 mm (4.6 in)
2002
52.6 mm (2.1 in)
2003
103.6 mm (4.1 in)
2004
71.6 mm (2.8 in)
2005
47.2 mm (1.9 in)
2006
79.8 mm (3.1 in)
2007
45.2 mm (1.8 in)
2008
72.6 mm (2.9 in)
2009
38.4 mm (1.5 in)
2010
162.3 mm (6.4 in)
2011
85.3 mm (3.4 in)
2012
65.3 mm (2.6 in)
2013
58.9 mm (2.3 in)
2014
78.2 mm (3.1 in)
2015
56.9 mm (2.2 in)
2016
39.9 mm (1.6 in)
2017
52.8 mm (2.1 in)
2018
59.9 mm (2.4 in)
2019
54.9 mm (2.2 in)
2020
89.4 mm (3.5 in)
2021
136.7 mm (5.4 in)
2022
80.8 mm (3.2 in)
2023
42.7 mm (1.7 in)
2024
52.8 mm (2.1 in)
2025
104.6 mm (4.1 in)
2026
38.1 mm (1.5 in)
Wettest five days (Rx5day)
The wettest five days of the year at Francis E Walter Dam, 1963 to 2026. The record is 208.0 mm (8.2 in) in 1969, marked on the chart; the median year is 88.4 mm (3.5 in).
Wettest five days (Rx5day) at Francis E Walter Dam by year
Year
Wettest five days (Rx5day)
1963
70.1 mm (2.8 in)
1964
60.5 mm (2.4 in)
1965
65.2 mm (2.6 in)
1966
76.7 mm (3.0 in)
1967
70.3 mm (2.8 in)
1968
68.3 mm (2.7 in)
1969
208.0 mm (8.2 in)
1970
53.0 mm (2.1 in)
1971
96.8 mm (3.8 in)
1972
130.0 mm (5.1 in)
1973
166.4 mm (6.6 in)
1974
77.9 mm (3.1 in)
1975
110.6 mm (4.4 in)
1976
82.5 mm (3.2 in)
1977
108.2 mm (4.3 in)
1978
96.1 mm (3.8 in)
1979
116.4 mm (4.6 in)
1980
58.4 mm (2.3 in)
1981
75.2 mm (3.0 in)
1982
75.5 mm (3.0 in)
1983
135.6 mm (5.3 in)
1984
117.5 mm (4.6 in)
1985
163.6 mm (6.4 in)
1986
88.3 mm (3.5 in)
1987
154.4 mm (6.1 in)
1988
126.2 mm (5.0 in)
1989
118.4 mm (4.7 in)
1990
95.0 mm (3.7 in)
1991
88.1 mm (3.5 in)
1992
59.5 mm (2.3 in)
1993
81.8 mm (3.2 in)
1994
118.1 mm (4.6 in)
1995
93.0 mm (3.7 in)
1996
119.2 mm (4.7 in)
1997
139.5 mm (5.5 in)
1998
78.4 mm (3.1 in)
1999
159.8 mm (6.3 in)
2000
78.7 mm (3.1 in)
2001
121.1 mm (4.8 in)
2002
95.5 mm (3.8 in)
2003
119.6 mm (4.7 in)
2004
79.5 mm (3.1 in)
2005
77.2 mm (3.0 in)
2006
164.6 mm (6.5 in)
2007
64.3 mm (2.5 in)
2008
53.4 mm (2.1 in)
2009
54.4 mm (2.1 in)
2010
202.4 mm (8.0 in)
2011
158.4 mm (6.2 in)
2012
78.8 mm (3.1 in)
2013
86.4 mm (3.4 in)
2014
88.4 mm (3.5 in)
2015
95.3 mm (3.8 in)
2016
n/a
2017
82.5 mm (3.2 in)
2018
154.8 mm (6.1 in)
2019
90.2 mm (3.6 in)
2020
73.9 mm (2.9 in)
2021
25.4 mm (1.0 in)
2022
41.2 mm (1.6 in)
2023
n/a
2024
35.1 mm (1.4 in)
2025
107.1 mm (4.2 in)
2026
38.1 mm (1.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Francis E Walter Dam, 1963 to 2026. The record is 27 days in 1963, marked on the chart; the median year is 14 days.
Longest dry spell (CDD) at Francis E Walter Dam by year
Year
Longest dry spell (CDD)
1963
27 days
1964
26 days
1965
11 days
1966
13 days
1967
19 days
1968
18 days
1969
21 days
1970
14 days
1971
18 days
1972
13 days
1973
14 days
1974
16 days
1975
17 days
1976
17 days
1977
14 days
1978
13 days
1979
15 days
1980
27 days
1981
15 days
1982
12 days
1983
17 days
1984
17 days
1985
19 days
1986
14 days
1987
21 days
1988
13 days
1989
14 days
1990
10 days
1991
23 days
1992
16 days
1993
17 days
1994
16 days
1995
19 days
1996
10 days
1997
11 days
1998
12 days
1999
16 days
2000
21 days
2001
12 days
2002
20 days
2003
12 days
2004
8 days
2005
20 days
2006
15 days
2007
11 days
2008
12 days
2009
8 days
2010
10 days
2011
9 days
2012
12 days
2013
14 days
2014
16 days
2015
4 days
2016
4 days
2017
15 days
2018
12 days
2019
11 days
2020
13 days
2021
11 days
2022
6 days
2023
4 days
2024
17 days
2025
5 days
2026
6 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
40 years with a frost
Across 40 years with a frost, the median last spring frost at Francis E Walter Dam falls on 16 May and the median first autumn frost on 28 September, which leaves a median of 140 days between them.
Fitted over all years, the growing season changes by +8.7 days per decade at this station.
Frost dates and growing season at Francis E Walter Dam
Measure
Median, all years
Earliest period
Recent period (1980 to 2025)
Recent against earliest
Fitted trend
Last spring frost
16 May
n/a
15 May
n/a
-3.6 days per decade
First autumn frost
28 September
n/a
5 October
n/a
+5.1 days per decade
Growing days
140 days
n/a
145 days
n/a
+8.7 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
36 years, 1964 to 2018
A day with at least 57.7 mm (2.3 in) of rain is expected about once in 2 years. A day with at least 172.3 mm (6.8 in) of rain is expected about once in 100 years.
Rainfall return levels at Francis E Walter 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
57.7 mm (2.3 in)
5 years
79.3 mm (3.1 in)
10 years
96.6 mm (3.8 in)
25 years
122.8 mm (4.8 in)
50 years
145.8 mm (5.7 in)
Longer than the 36 years of record
100 years
172.3 mm (6.8 in)
Longer than the 36 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, 36 years of values from 1964 to 2018.
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: 169.4 mm (6.7 in) in 1969; 130.8 mm (5.1 in) in 1973; 101.6 mm (4.0 in) in 1985.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Francis E Walter Dam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Francis E Walter 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.