Record envelope, standing records and threshold days for Donora 1 SW (USC00362190), Pennsylvania, United States, with 101 years of record.
Key Facts for Donora 1 SW
Donora 1 SW (USC00362190) is a weather station in Pennsylvania, United States at 40.16 latitude and -79.87 longitude, 232 m (762 ft) above sea level.
The station reports from 1926 to 2026, 101 years of record.
1,464 records set at Donora 1 SW still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Donora 1 SW set a daily record high minimum temperature of 16.1 C (61.0 F) on 14 April 2026.
About the Station
Location: Pennsylvania, United States, 40.16 latitude, -79.87 longitude.
Elevation: 232 m (762 ft).
Period of record: 1926 to 2026, 101 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 Donora 1 SW. 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 Donora 1 SW, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
25.6 C (78.1 F)
-28.3 C (-18.9 F)
15.6 C (60.1 F)
-19.4 C (-2.9 F)
Feb
26.1 C (79.0 F)
-25.6 C (-14.1 F)
17.2 C (63.0 F)
-20.6 C (-5.1 F)
Mar
31.1 C (88.0 F)
-18.9 C (-2.0 F)
n/a
n/a
Apr
33.3 C (91.9 F)
-11.7 C (10.9 F)
27.8 C (82.0 F)
-3.9 C (25.0 F)
May
35.6 C (96.1 F)
-5.6 C (21.9 F)
n/a
n/a
Jun
38.3 C (100.9 F)
2.8 C (37.0 F)
n/a
n/a
Jul
40.6 C (105.1 F)
4.4 C (39.9 F)
n/a
n/a
Aug
40.6 C (105.1 F)
3.3 C (37.9 F)
n/a
n/a
Sep
39.4 C (102.9 F)
-0.6 C (30.9 F)
n/a
n/a
Oct
35.0 C (95.0 F)
-8.3 C (17.1 F)
n/a
n/a
Nov
29.4 C (84.9 F)
-18.3 C (-0.9 F)
n/a
n/a
Dec
25.0 C (77.0 F)
-23.9 C (-11.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Donora 1 SW still stand. 1933 holds the most, with 43.
Standing records at Donora 1 SW by the year they were set
Year set
Standing records
1926
8
1927
30
1928
15
1929
26
1930
42
1931
28
1932
25
1933
43
1934
35
1935
28
1936
37
1937
11
1938
18
1939
17
1940
19
1941
25
1942
19
1943
17
1944
13
1945
19
1946
14
1947
24
1948
10
1949
24
1950
27
1951
16
1952
18
1953
18
1954
29
1955
11
1956
13
1957
11
1958
11
1959
16
1960
15
1961
22
1962
21
1963
19
1964
16
1965
20
1966
10
1967
12
1968
18
1969
8
1970
13
1971
7
1972
19
1973
10
1974
15
1975
9
1976
20
1977
18
1978
8
1979
27
1980
12
1981
11
1982
18
1983
27
1984
12
1985
16
1986
13
1987
8
1988
17
1989
17
1990
14
1991
14
1992
11
1993
6
1994
14
1995
2
1996
12
1997
11
1998
13
1999
8
2000
13
2001
8
2002
14
2003
4
2004
5
2005
3
2006
6
2007
10
2008
4
2009
8
2010
6
2011
8
2012
6
2013
7
2014
13
2015
16
2016
5
2017
12
2018
8
2019
7
2020
3
2021
2
2022
4
2023
5
2024
1
2025
3
2026
3
All-Time Record Progression
7 new records
7 all-time records were set at Donora 1 SW between 24 January 1963 and 18 September 2004. Each dot is a new record.
When Donora 1 SW set new all-time records
Date
Kind
Detail
1963-01-24
Record low minimum temperature
Record low minimum temperature -26.7 C (-16.1 F)
1969-08-19
Record daily precipitation
Record daily precipitation 90.4 mm (3.6 in)
1978-01-20
Record snow depth
Record snow depth 66.0 cm (26.0 in)
1982-01-12
Record low minimum temperature
Record low minimum temperature -28.3 C (-18.9 F)
1993-03-13
Record daily snowfall
Record daily snowfall 50.8 cm (20.0 in)
2000-08-07
Record daily precipitation
Record daily precipitation 94.5 mm (3.7 in)
2004-09-18
Record daily precipitation
Record daily precipitation 110.7 mm (4.4 in)
Wettest Day of Each Month
Sep: 110.7 mm (4.4 in)
The wettest day on record for each calendar month at Donora 1 SW. The most was 110.7 mm (4.4 in) on 18 September 2004.
Record daily precipitation for each month at Donora 1 SW
Month
Record daily precipitation (mm)
Date
Jan
50.8 mm (2.0 in)
6 January 2005
Feb
56.6 mm (2.2 in)
16 February 2018
Mar
65.8 mm (2.6 in)
6 March 1945
Apr
71.6 mm (2.8 in)
30 April 2021
May
76.2 mm (3.0 in)
6 May 1971
Jun
90.4 mm (3.6 in)
23 June 1972
Jul
87.6 mm (3.4 in)
29 July 1999
Aug
94.5 mm (3.7 in)
7 August 2000
Sep
110.7 mm (4.4 in)
18 September 2004
Oct
79.2 mm (3.1 in)
16 October 1954
Nov
52.3 mm (2.1 in)
4 November 1950
Dec
57.2 mm (2.3 in)
1 December 2010
Period of Record Coverage
1926 to 2026
Complete yearUnder 90 percent of days
101 years of record at Donora 1 SW, 1926 to 2026. 21 years have data for under 90 percent of days and are left out of rankings: 1926, 1942, 1943, 1944, 1945, 1946, 1947, 1966 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 82 complete years at Donora 1 SW, 1927 to 2016. Blue stripes are years cooler than the station's own mean of 12.0 C (53.6 F); red stripes are warmer. The coolest year was 1961, at 10.6 C (51.0 F), and the warmest was 1949, at 13.8 C (56.9 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Donora 1 SW as warming stripes, 1927 to 2016
Year
Annual mean temperature
Difference from the station mean
1927
12.5 C
+0.55 C
1928
11.5 C
-0.45 C
1929
12.1 C
+0.07 C
1930
12.3 C
+0.27 C
1931
13.4 C
+1.41 C
1932
12.9 C
+0.89 C
1933
13.4 C
+1.45 C
1934
12.4 C
+0.42 C
1935
12.2 C
+0.21 C
1936
12.1 C
+0.13 C
1937
12.2 C
+0.22 C
1938
13.1 C
+1.09 C
1939
13.0 C
+0.97 C
1940
11.2 C
-0.76 C
1941
12.5 C
+0.47 C
1942
12.8 C
+0.82 C
1943
12.2 C
+0.24 C
1944
12.8 C
+0.78 C
1945
12.8 C
+0.80 C
1947
12.6 C
+0.63 C
1948
13.0 C
+1.00 C
1949
13.8 C
+1.84 C
1950
12.3 C
+0.33 C
1951
12.7 C
+0.67 C
1952
13.1 C
+1.09 C
1953
13.6 C
+1.60 C
1954
13.2 C
+1.22 C
1955
13.1 C
+1.09 C
1956
12.8 C
+0.77 C
1957
13.0 C
+1.01 C
1958
10.9 C
-1.12 C
1959
12.5 C
+0.55 C
1960
10.7 C
-1.27 C
1961
10.6 C
-1.42 C
1962
11.5 C
-0.52 C
1963
11.0 C
-0.96 C
1964
12.1 C
+0.15 C
1965
11.5 C
-0.45 C
1967
11.4 C
-0.56 C
1968
11.3 C
-0.66 C
1969
10.8 C
-1.24 C
1971
11.7 C
-0.27 C
1973
12.6 C
+0.62 C
1974
11.9 C
-0.14 C
1975
12.1 C
+0.11 C
1976
10.8 C
-1.15 C
1977
11.5 C
-0.52 C
1978
10.9 C
-1.10 C
1979
11.0 C
-1.01 C
1980
11.2 C
-0.76 C
1982
11.6 C
-0.40 C
1983
11.5 C
-0.50 C
1984
11.9 C
-0.08 C
1986
12.5 C
+0.49 C
1987
12.7 C
+0.66 C
1988
11.7 C
-0.31 C
1989
10.9 C
-1.09 C
1990
12.7 C
+0.67 C
1991
13.0 C
+0.99 C
1992
11.6 C
-0.41 C
1994
11.4 C
-0.64 C
1995
11.1 C
-0.85 C
1996
10.8 C
-1.20 C
1997
10.9 C
-1.11 C
1998
13.0 C
+0.98 C
1999
12.1 C
+0.14 C
2000
11.3 C
-0.73 C
2001
12.0 C
-0.04 C
2002
12.1 C
+0.07 C
2003
11.0 C
-0.96 C
2004
11.6 C
-0.40 C
2005
11.7 C
-0.26 C
2006
12.2 C
+0.20 C
2007
11.8 C
-0.22 C
2008
11.0 C
-0.97 C
2009
11.0 C
-1.00 C
2010
11.2 C
-0.81 C
2011
11.7 C
-0.33 C
2012
12.5 C
+0.50 C
2013
10.9 C
-1.07 C
2015
11.4 C
-0.55 C
2016
12.0 C
+0.01 C
The annual mean temperature here has fallen by 0.1 C (0.1 to 0.2) per decade over 1927 to 2016. In Fahrenheit: 0.3 F (0.1 to 0.4) per decade. The slope is a straight line fitted to 82 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Donora 1 SW
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.1 C (-0.2 to -0.1) per decade
-0.3 F (-0.4 to -0.1) per decade
1927 to 2016
82
Fall
Mean daily maximum
-0.11 C (-0.18 to -0.04) per decade
-0.2 F (-0.3 to -0.1) per decade
1927 to 2016
82
Fall
Mean daily minimum
-0.2 C (-0.3 to -0.1) per decade
-0.3 F (-0.5 to -0.2) per decade
1927 to 2016
82
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
1926 to 2026
Yearly extremes at Donora 1 SW: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
40.6 C (105.1 F)
1930
35.0 C (95.0 F)
101
Coldest night (TNn)
-28.3 C (-18.9 F)
1982
-18.3 C (-0.9 F)
101
Wettest day (Rx1day)
110.7 mm (4.4 in)
2004
50.8 mm (2.0 in)
101
Wettest five days (Rx5day)
152.7 mm (6.0 in)
2000
78.2 mm (3.1 in)
99
Longest dry spell (CDD)
51 days
1969
15 days
101
Hottest day (TXx)
The hottest day of the year at Donora 1 SW, 1926 to 2026. The record is 40.6 C (105.1 F) in 1930, marked on the chart; the median year is 35.0 C (95.0 F).
Hottest day (TXx) at Donora 1 SW by year
Year
Hottest day (TXx)
1926
37.2 C (99.0 F)
1927
34.4 C (93.9 F)
1928
35.0 C (95.0 F)
1929
35.0 C (95.0 F)
1930
40.6 C (105.1 F)
1931
37.8 C (100.0 F)
1932
38.3 C (100.9 F)
1933
38.3 C (100.9 F)
1934
40.0 C (104.0 F)
1935
36.7 C (98.1 F)
1936
40.0 C (104.0 F)
1937
35.6 C (96.1 F)
1938
35.0 C (95.0 F)
1939
37.2 C (99.0 F)
1940
36.1 C (97.0 F)
1941
37.8 C (100.0 F)
1942
37.2 C (99.0 F)
1943
36.1 C (97.0 F)
1944
36.7 C (98.1 F)
1945
35.6 C (96.1 F)
1946
35.0 C (95.0 F)
1947
34.4 C (93.9 F)
1948
37.8 C (100.0 F)
1949
37.2 C (99.0 F)
1950
33.3 C (91.9 F)
1951
34.4 C (93.9 F)
1952
36.1 C (97.0 F)
1953
39.4 C (102.9 F)
1954
37.2 C (99.0 F)
1955
37.8 C (100.0 F)
1956
35.0 C (95.0 F)
1957
36.7 C (98.1 F)
1958
32.8 C (91.0 F)
1959
36.1 C (97.0 F)
1960
33.3 C (91.9 F)
1961
32.8 C (91.0 F)
1962
36.1 C (97.0 F)
1963
33.9 C (93.0 F)
1964
34.4 C (93.9 F)
1965
36.1 C (97.0 F)
1966
31.1 C (88.0 F)
1967
33.9 C (93.0 F)
1968
36.1 C (97.0 F)
1969
35.0 C (95.0 F)
1970
33.3 C (91.9 F)
1971
35.6 C (96.1 F)
1972
33.9 C (93.0 F)
1973
35.0 C (95.0 F)
1974
32.2 C (90.0 F)
1975
37.2 C (99.0 F)
1976
33.3 C (91.9 F)
1977
35.0 C (95.0 F)
1978
35.0 C (95.0 F)
1979
35.6 C (96.1 F)
1980
36.1 C (97.0 F)
1981
32.8 C (91.0 F)
1982
33.9 C (93.0 F)
1983
40.6 C (105.1 F)
1984
33.9 C (93.0 F)
1985
33.9 C (93.0 F)
1986
33.9 C (93.0 F)
1987
35.6 C (96.1 F)
1988
38.9 C (102.0 F)
1989
36.1 C (97.0 F)
1990
33.9 C (93.0 F)
1991
36.7 C (98.1 F)
1992
33.3 C (91.9 F)
1993
36.1 C (97.0 F)
1994
37.2 C (99.0 F)
1995
36.7 C (98.1 F)
1996
32.8 C (91.0 F)
1997
34.4 C (93.9 F)
1998
33.9 C (93.0 F)
1999
36.7 C (98.1 F)
2000
32.2 C (90.0 F)
2001
33.9 C (93.0 F)
2002
35.0 C (95.0 F)
2003
32.2 C (90.0 F)
2004
31.1 C (88.0 F)
2005
35.6 C (96.1 F)
2006
35.0 C (95.0 F)
2007
34.4 C (93.9 F)
2008
32.8 C (91.0 F)
2009
32.8 C (91.0 F)
2010
37.2 C (99.0 F)
2011
35.0 C (95.0 F)
2012
37.8 C (100.0 F)
2013
33.3 C (91.9 F)
2014
31.7 C (89.1 F)
2015
33.9 C (93.0 F)
2016
34.4 C (93.9 F)
2017
31.7 C (89.1 F)
2018
33.9 C (93.0 F)
2019
33.3 C (91.9 F)
2020
34.4 C (93.9 F)
2021
33.3 C (91.9 F)
2022
33.9 C (93.0 F)
2023
32.2 C (90.0 F)
2024
34.4 C (93.9 F)
2025
34.4 C (93.9 F)
2026
27.8 C (82.0 F)
Coldest night (TNn)
The coldest night of the year at Donora 1 SW, 1926 to 2026. The record is -28.3 C (-18.9 F) in 1982, marked on the chart; the median year is -18.3 C (-0.9 F).
Coldest night (TNn) at Donora 1 SW by year
Year
Coldest night (TNn)
1926
-13.3 C (8.1 F)
1927
-14.4 C (6.1 F)
1928
-13.9 C (7.0 F)
1929
-17.8 C (0.0 F)
1930
-15.0 C (5.0 F)
1931
-11.1 C (12.0 F)
1932
-18.9 C (-2.0 F)
1933
-17.2 C (1.0 F)
1934
-25.6 C (-14.1 F)
1935
-17.8 C (0.0 F)
1936
-25.0 C (-13.0 F)
1937
-11.7 C (10.9 F)
1938
-13.3 C (8.1 F)
1939
-13.3 C (8.1 F)
1940
-20.6 C (-5.1 F)
1941
-13.3 C (8.1 F)
1942
-21.1 C (-6.0 F)
1943
-18.3 C (-0.9 F)
1944
-16.7 C (1.9 F)
1945
-16.7 C (1.9 F)
1946
-14.4 C (6.1 F)
1947
-16.1 C (3.0 F)
1948
-19.4 C (-2.9 F)
1949
-13.3 C (8.1 F)
1950
-17.8 C (0.0 F)
1951
-18.9 C (-2.0 F)
1952
-12.8 C (9.0 F)
1953
-11.7 C (10.9 F)
1954
-14.4 C (6.1 F)
1955
-18.9 C (-2.0 F)
1956
-11.7 C (10.9 F)
1957
-19.4 C (-2.9 F)
1958
-22.2 C (-8.0 F)
1959
-20.0 C (-4.0 F)
1960
-20.0 C (-4.0 F)
1961
-23.9 C (-11.0 F)
1962
-23.3 C (-9.9 F)
1963
-26.7 C (-16.1 F)
1964
-18.3 C (-0.9 F)
1965
-20.0 C (-4.0 F)
1966
-22.2 C (-8.0 F)
1967
-18.3 C (-0.9 F)
1968
-21.7 C (-7.1 F)
1969
-15.6 C (3.9 F)
1970
-21.1 C (-6.0 F)
1971
-18.9 C (-2.0 F)
1972
-25.0 C (-13.0 F)
1973
-18.9 C (-2.0 F)
1974
-12.2 C (10.0 F)
1975
-16.7 C (1.9 F)
1976
-19.4 C (-2.9 F)
1977
-26.1 C (-15.0 F)
1978
-17.8 C (0.0 F)
1979
-23.9 C (-11.0 F)
1980
-18.3 C (-0.9 F)
1981
-20.6 C (-5.1 F)
1982
-28.3 C (-18.9 F)
1983
-22.8 C (-9.0 F)
1984
-22.8 C (-9.0 F)
1985
-27.2 C (-17.0 F)
1986
-16.7 C (1.9 F)
1987
-16.7 C (1.9 F)
1988
-17.8 C (0.0 F)
1989
-23.9 C (-11.0 F)
1990
-17.2 C (1.0 F)
1991
-21.7 C (-7.1 F)
1992
-17.8 C (0.0 F)
1993
-15.6 C (3.9 F)
1994
-26.1 C (-15.0 F)
1995
-17.8 C (0.0 F)
1996
-20.0 C (-4.0 F)
1997
-17.2 C (1.0 F)
1998
-12.2 C (10.0 F)
1999
-16.7 C (1.9 F)
2000
-16.7 C (1.9 F)
2001
-11.1 C (12.0 F)
2002
-13.9 C (7.0 F)
2003
-20.0 C (-4.0 F)
2004
-18.3 C (-0.9 F)
2005
-15.6 C (3.9 F)
2006
-14.4 C (6.1 F)
2007
-19.4 C (-2.9 F)
2008
-14.4 C (6.1 F)
2009
-20.6 C (-5.1 F)
2010
-17.8 C (0.0 F)
2011
-19.4 C (-2.9 F)
2012
-12.8 C (9.0 F)
2013
-13.9 C (7.0 F)
2014
-22.2 C (-8.0 F)
2015
-22.2 C (-8.0 F)
2016
-22.2 C (-8.0 F)
2017
-16.1 C (3.0 F)
2018
-20.0 C (-4.0 F)
2019
-21.1 C (-6.0 F)
2020
-11.1 C (12.0 F)
2021
-15.0 C (5.0 F)
2022
-22.2 C (-8.0 F)
2023
-13.9 C (7.0 F)
2024
-15.0 C (5.0 F)
2025
-21.7 C (-7.1 F)
2026
-20.6 C (-5.1 F)
Wettest day (Rx1day)
The wettest day of the year at Donora 1 SW, 1926 to 2026. The record is 110.7 mm (4.4 in) in 2004, marked on the chart; the median year is 50.8 mm (2.0 in).
Wettest day (Rx1day) at Donora 1 SW by year
Year
Wettest day (Rx1day)
1926
43.7 mm (1.7 in)
1927
33.8 mm (1.3 in)
1928
44.2 mm (1.7 in)
1929
48.3 mm (1.9 in)
1930
46.5 mm (1.8 in)
1931
42.2 mm (1.7 in)
1932
40.9 mm (1.6 in)
1933
64.5 mm (2.5 in)
1934
51.6 mm (2.0 in)
1935
43.9 mm (1.7 in)
1936
57.2 mm (2.3 in)
1937
50.3 mm (2.0 in)
1938
34.5 mm (1.4 in)
1939
48.8 mm (1.9 in)
1940
45.7 mm (1.8 in)
1941
72.1 mm (2.8 in)
1942
60.5 mm (2.4 in)
1943
39.1 mm (1.5 in)
1944
40.9 mm (1.6 in)
1945
65.8 mm (2.6 in)
1946
41.9 mm (1.6 in)
1947
47.5 mm (1.9 in)
1948
59.7 mm (2.4 in)
1949
52.1 mm (2.1 in)
1950
61.0 mm (2.4 in)
1951
45.0 mm (1.8 in)
1952
62.0 mm (2.4 in)
1953
53.6 mm (2.1 in)
1954
79.2 mm (3.1 in)
1955
69.9 mm (2.8 in)
1956
88.9 mm (3.5 in)
1957
31.0 mm (1.2 in)
1958
44.2 mm (1.7 in)
1959
31.5 mm (1.2 in)
1960
70.4 mm (2.8 in)
1961
36.3 mm (1.4 in)
1962
75.2 mm (3.0 in)
1963
45.7 mm (1.8 in)
1964
42.2 mm (1.7 in)
1965
46.5 mm (1.8 in)
1966
50.3 mm (2.0 in)
1967
55.4 mm (2.2 in)
1968
69.9 mm (2.8 in)
1969
90.4 mm (3.6 in)
1970
45.7 mm (1.8 in)
1971
76.2 mm (3.0 in)
1972
90.4 mm (3.6 in)
1973
38.6 mm (1.5 in)
1974
64.8 mm (2.6 in)
1975
74.9 mm (2.9 in)
1976
43.4 mm (1.7 in)
1977
55.9 mm (2.2 in)
1978
31.8 mm (1.3 in)
1979
49.3 mm (1.9 in)
1980
74.7 mm (2.9 in)
1981
49.3 mm (1.9 in)
1982
42.2 mm (1.7 in)
1983
31.8 mm (1.3 in)
1984
36.3 mm (1.4 in)
1985
49.5 mm (1.9 in)
1986
75.7 mm (3.0 in)
1987
41.9 mm (1.6 in)
1988
72.1 mm (2.8 in)
1989
30.5 mm (1.2 in)
1990
59.4 mm (2.3 in)
1991
50.8 mm (2.0 in)
1992
78.0 mm (3.1 in)
1993
45.7 mm (1.8 in)
1994
51.1 mm (2.0 in)
1995
38.1 mm (1.5 in)
1996
49.0 mm (1.9 in)
1997
53.3 mm (2.1 in)
1998
33.0 mm (1.3 in)
1999
87.6 mm (3.4 in)
2000
94.5 mm (3.7 in)
2001
25.1 mm (1.0 in)
2002
50.5 mm (2.0 in)
2003
52.1 mm (2.1 in)
2004
110.7 mm (4.4 in)
2005
50.8 mm (2.0 in)
2006
38.1 mm (1.5 in)
2007
76.5 mm (3.0 in)
2008
53.3 mm (2.1 in)
2009
36.1 mm (1.4 in)
2010
57.2 mm (2.3 in)
2011
84.1 mm (3.3 in)
2012
76.2 mm (3.0 in)
2013
50.8 mm (2.0 in)
2014
61.0 mm (2.4 in)
2015
59.7 mm (2.4 in)
2016
59.7 mm (2.4 in)
2017
51.6 mm (2.0 in)
2018
56.6 mm (2.2 in)
2019
55.9 mm (2.2 in)
2020
41.9 mm (1.6 in)
2021
71.6 mm (2.8 in)
2022
40.6 mm (1.6 in)
2023
45.7 mm (1.8 in)
2024
62.2 mm (2.4 in)
2025
51.3 mm (2.0 in)
2026
20.3 mm (0.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Donora 1 SW, 1926 to 2026. The record is 152.7 mm (6.0 in) in 2000, marked on the chart; the median year is 78.2 mm (3.1 in).
Wettest five days (Rx5day) at Donora 1 SW by year
Year
Wettest five days (Rx5day)
1926
80.6 mm (3.2 in)
1927
90.4 mm (3.6 in)
1928
53.1 mm (2.1 in)
1929
107.2 mm (4.2 in)
1930
71.4 mm (2.8 in)
1931
58.4 mm (2.3 in)
1932
60.2 mm (2.4 in)
1933
99.4 mm (3.9 in)
1934
81.5 mm (3.2 in)
1935
86.1 mm (3.4 in)
1936
111.8 mm (4.4 in)
1937
102.9 mm (4.1 in)
1938
64.2 mm (2.5 in)
1939
73.4 mm (2.9 in)
1940
73.4 mm (2.9 in)
1941
120.6 mm (4.7 in)
1942
95.0 mm (3.7 in)
1943
100.1 mm (3.9 in)
1944
62.3 mm (2.5 in)
1945
92.6 mm (3.6 in)
1946
50.6 mm (2.0 in)
1947
103.8 mm (4.1 in)
1948
99.4 mm (3.9 in)
1949
71.6 mm (2.8 in)
1950
81.1 mm (3.2 in)
1951
82.6 mm (3.3 in)
1952
78.0 mm (3.1 in)
1953
63.5 mm (2.5 in)
1954
103.7 mm (4.1 in)
1955
92.7 mm (3.6 in)
1956
119.1 mm (4.7 in)
1957
63.2 mm (2.5 in)
1958
73.9 mm (2.9 in)
1959
64.4 mm (2.5 in)
1960
70.7 mm (2.8 in)
1961
75.7 mm (3.0 in)
1962
88.6 mm (3.5 in)
1963
78.2 mm (3.1 in)
1964
71.6 mm (2.8 in)
1965
52.9 mm (2.1 in)
1966
62.0 mm (2.4 in)
1967
118.6 mm (4.7 in)
1968
78.8 mm (3.1 in)
1969
90.4 mm (3.6 in)
1970
64.5 mm (2.5 in)
1971
86.9 mm (3.4 in)
1972
142.3 mm (5.6 in)
1973
72.0 mm (2.8 in)
1974
124.0 mm (4.9 in)
1975
124.8 mm (4.9 in)
1976
62.1 mm (2.4 in)
1977
65.8 mm (2.6 in)
1978
58.0 mm (2.3 in)
1979
100.6 mm (4.0 in)
1980
95.6 mm (3.8 in)
1981
102.6 mm (4.0 in)
1982
47.5 mm (1.9 in)
1983
63.5 mm (2.5 in)
1984
53.3 mm (2.1 in)
1985
91.7 mm (3.6 in)
1986
106.8 mm (4.2 in)
1987
53.8 mm (2.1 in)
1988
125.1 mm (4.9 in)
1989
73.2 mm (2.9 in)
1990
84.3 mm (3.3 in)
1991
64.4 mm (2.5 in)
1992
104.4 mm (4.1 in)
1993
71.4 mm (2.8 in)
1994
104.1 mm (4.1 in)
1995
59.9 mm (2.4 in)
1996
71.9 mm (2.8 in)
1997
92.8 mm (3.7 in)
1998
63.5 mm (2.5 in)
1999
94.2 mm (3.7 in)
2000
152.7 mm (6.0 in)
2001
52.2 mm (2.1 in)
2002
64.7 mm (2.5 in)
2003
123.2 mm (4.9 in)
2004
116.3 mm (4.6 in)
2005
108.6 mm (4.3 in)
2006
76.1 mm (3.0 in)
2007
103.2 mm (4.1 in)
2008
68.1 mm (2.7 in)
2009
67.3 mm (2.6 in)
2010
73.7 mm (2.9 in)
2011
109.5 mm (4.3 in)
2012
116.0 mm (4.6 in)
2013
84.8 mm (3.3 in)
2014
75.5 mm (3.0 in)
2015
81.5 mm (3.2 in)
2016
76.7 mm (3.0 in)
2017
57.9 mm (2.3 in)
2018
58.5 mm (2.3 in)
2019
40.9 mm (1.6 in)
2020
80.3 mm (3.2 in)
2021
81.2 mm (3.2 in)
2022
28.2 mm (1.1 in)
2023
18.2 mm (0.7 in)
2024
n/a
2025
14.0 mm (0.6 in)
2026
n/a
Longest dry spell (CDD)
The longest dry spell of the year at Donora 1 SW, 1926 to 2026. The record is 51 days in 1969, marked on the chart; the median year is 15 days.
Longest dry spell (CDD) at Donora 1 SW by year
Year
Longest dry spell (CDD)
1926
7 days
1927
13 days
1928
15 days
1929
18 days
1930
16 days
1931
18 days
1932
29 days
1933
13 days
1934
20 days
1935
13 days
1936
18 days
1937
11 days
1938
21 days
1939
23 days
1940
13 days
1941
17 days
1942
21 days
1943
26 days
1944
18 days
1945
15 days
1946
17 days
1947
18 days
1948
16 days
1949
13 days
1950
14 days
1951
14 days
1952
12 days
1953
24 days
1954
14 days
1955
23 days
1956
13 days
1957
15 days
1958
9 days
1959
29 days
1960
16 days
1961
11 days
1962
19 days
1963
23 days
1964
26 days
1965
13 days
1966
17 days
1967
26 days
1968
25 days
1969
51 days
1970
29 days
1971
16 days
1972
15 days
1973
15 days
1974
12 days
1975
12 days
1976
25 days
1977
14 days
1978
18 days
1979
10 days
1980
14 days
1981
16 days
1982
17 days
1983
13 days
1984
17 days
1985
19 days
1986
14 days
1987
19 days
1988
28 days
1989
17 days
1990
13 days
1991
19 days
1992
18 days
1993
12 days
1994
17 days
1995
28 days
1996
10 days
1997
23 days
1998
21 days
1999
15 days
2000
14 days
2001
12 days
2002
11 days
2003
13 days
2004
15 days
2005
21 days
2006
17 days
2007
15 days
2008
15 days
2009
27 days
2010
15 days
2011
12 days
2012
19 days
2013
14 days
2014
10 days
2015
13 days
2016
11 days
2017
9 days
2018
5 days
2019
6 days
2020
5 days
2021
5 days
2022
9 days
2023
4 days
2024
4 days
2025
4 days
2026
4 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
82 years with a frost
Across 82 years with a frost, the median last spring frost at Donora 1 SW falls on 25 April and the median first autumn frost on 21 October, which leaves a median of 181 days between them.
In 1984 to 2016 the median growing season was 179 days. That is 9 days fewer than in 1927 to 1957.
Fitted over all years, the growing season changes by -1.1 days per decade at this station.
Frost dates and growing season at Donora 1 SW
Measure
Median, all years
Earliest period (1927 to 1957)
Recent period (1984 to 2016)
Recent against earliest
Fitted trend
Last spring frost
25 April
22 April
25 April
3 days later
+0.6 days per decade
First autumn frost
21 October
26 October
21 October
5 days earlier
-0.5 days per decade
Growing days
181 days
188 days
179 days
9 days fewer
-1.1 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
86 years, 1928 to 2016
A day with at least 52.5 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 110.4 mm (4.3 in) of rain is expected about once in 100 years.
Rainfall return levels at Donora 1 SW: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
52.5 mm (2.1 in)
5 years
68.3 mm (2.7 in)
10 years
78.7 mm (3.1 in)
25 years
91.6 mm (3.6 in)
50 years
101.1 mm (4.0 in)
100 years
110.4 mm (4.3 in)
Longer than the 86 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, 86 years of values from 1928 to 2016.
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: 110.7 mm (4.4 in) in 2004; 94.5 mm (3.7 in) in 2000; 90.4 mm (3.6 in) in 1969.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Donora 1 SW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Donora 1 SW 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.