Record envelope, standing records and threshold days for Pittsburgh WSO City (USW00014861), Pennsylvania, United States, with 54 years of record.
Key Facts for Pittsburgh WSO City
Pittsburgh WSO City (USW00014861) is a weather station in Pennsylvania, United States at 40.45 latitude and -80.00 longitude, 310 m (1,017 ft) above sea level.
The station reports from 1926 to 1979, 54 years of record.
1,464 records set at Pittsburgh WSO City still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Pittsburgh WSO City set a daily record precipitation of 46.5 mm (1.8 in) on 28 September 1979.
About the Station
Location: Pennsylvania, United States, 40.45 latitude, -80.00 longitude.
Elevation: 310 m (1,017 ft).
Period of record: 1926 to 1979, 54 years.
Eligible elements: tmax, tmin, prcp, snow.
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 Pittsburgh WSO City. 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 Pittsburgh WSO City, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
25.0 C (77.0 F)
-25.6 C (-14.1 F)
n/a
n/a
Feb
23.9 C (75.0 F)
-23.9 C (-11.0 F)
n/a
n/a
Mar
28.9 C (84.0 F)
-15.6 C (3.9 F)
n/a
n/a
Apr
32.8 C (91.0 F)
-7.8 C (18.0 F)
n/a
n/a
May
33.9 C (93.0 F)
-1.7 C (28.9 F)
n/a
n/a
Jun
37.2 C (99.0 F)
3.9 C (39.0 F)
n/a
n/a
Jul
37.2 C (99.0 F)
9.4 C (48.9 F)
n/a
n/a
Aug
37.8 C (100.0 F)
7.2 C (45.0 F)
n/a
n/a
Sep
37.8 C (100.0 F)
0.6 C (33.1 F)
n/a
n/a
Oct
32.8 C (91.0 F)
-4.4 C (24.1 F)
n/a
n/a
Nov
28.3 C (82.9 F)
-17.2 C (1.0 F)
n/a
n/a
Dec
22.8 C (73.0 F)
-21.7 C (-7.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Pittsburgh WSO City still stand. 1930 holds the most, with 59.
Standing records at Pittsburgh WSO City by the year they were set
Year set
Standing records
1926
34
1927
39
1928
31
1929
48
1930
59
1931
32
1932
40
1933
39
1934
45
1935
5
1939
16
1940
28
1941
37
1942
30
1943
34
1944
35
1945
32
1946
19
1947
29
1948
20
1949
35
1950
33
1951
28
1952
25
1953
26
1954
30
1955
23
1956
26
1957
15
1958
18
1959
24
1960
21
1961
22
1962
30
1963
29
1964
23
1965
29
1966
26
1967
22
1968
23
1969
17
1970
22
1971
26
1972
34
1973
24
1974
29
1975
23
1976
47
1977
46
1978
14
1979
22
All-Time Record Progression
5 new records
5 all-time records were set at Pittsburgh WSO City between 24 January 1963 and 17 January 1977. Each dot is a new record.
When Pittsburgh WSO City set new all-time records
Date
Kind
Detail
1963-01-24
Record low maximum temperature
Record low maximum temperature -15.6 C (3.9 F)
1963-01-24
Record low minimum temperature
Record low minimum temperature -25.0 C (-13.0 F)
1970-01-08
Record low maximum temperature
Record low maximum temperature -16.7 C (1.9 F)
1977-01-17
Record low maximum temperature
Record low maximum temperature -17.2 C (1.0 F)
1977-01-17
Record low minimum temperature
Record low minimum temperature -25.6 C (-14.1 F)
Wettest Day of Each Month
Oct: 90.7 mm (3.6 in)
The wettest day on record for each calendar month at Pittsburgh WSO City. The most was 90.7 mm (3.6 in) on 15 October 1954.
Record daily precipitation for each month at Pittsburgh WSO City
Month
Record daily precipitation (mm)
Date
Jan
41.9 mm (1.6 in)
26 January 1952
Feb
51.6 mm (2.0 in)
23 February 1975
Mar
64.0 mm (2.5 in)
6 March 1945
Apr
49.8 mm (2.0 in)
2 April 1977
May
54.9 mm (2.2 in)
6 May 1971
Jun
65.0 mm (2.6 in)
8 June 1955
Jul
72.6 mm (2.9 in)
22 July 1927
Aug
84.8 mm (3.3 in)
5 August 1956
Sep
62.0 mm (2.4 in)
8 September 1940
Oct
90.7 mm (3.6 in)
15 October 1954
Nov
45.5 mm (1.8 in)
16 November 1955
Dec
37.6 mm (1.5 in)
15 December 1948
Period of Record Coverage
1926 to 1979
Complete yearUnder 90 percent of days
51 years of record at Pittsburgh WSO City, 1926 to 1979. 3 years have data for under 90 percent of days and are left out of rankings: 1935, 1939, 1979.
Cooler than the station meanWarmer than the station mean
One stripe for each of 48 complete years at Pittsburgh WSO City, 1926 to 1978. Blue stripes are years cooler than the station's own mean of 11.8 C (53.2 F); red stripes are warmer. The coolest year was 1926, at 10.4 C (50.8 F), and the warmest was 1953, at 13.3 C (56.0 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Pittsburgh WSO City as warming stripes, 1926 to 1978
Year
Annual mean temperature
Difference from the station mean
1926
10.4 C
-1.33 C
1927
11.6 C
-0.19 C
1928
10.9 C
-0.88 C
1929
11.0 C
-0.79 C
1930
11.7 C
-0.03 C
1931
12.6 C
+0.84 C
1932
12.0 C
+0.20 C
1933
12.0 C
+0.26 C
1934
11.5 C
-0.29 C
1940
10.9 C
-0.84 C
1941
12.3 C
+0.57 C
1942
12.1 C
+0.34 C
1943
11.5 C
-0.28 C
1944
12.3 C
+0.51 C
1945
11.9 C
+0.18 C
1946
12.9 C
+1.13 C
1947
12.0 C
+0.21 C
1948
12.3 C
+0.56 C
1949
13.2 C
+1.48 C
1950
11.6 C
-0.20 C
1951
12.2 C
+0.45 C
1952
12.7 C
+0.96 C
1953
13.3 C
+1.56 C
1954
12.6 C
+0.83 C
1955
12.6 C
+0.79 C
1956
12.1 C
+0.32 C
1957
12.4 C
+0.67 C
1958
10.9 C
-0.90 C
1959
12.7 C
+0.91 C
1960
11.6 C
-0.19 C
1961
11.8 C
+0.04 C
1962
11.5 C
-0.30 C
1963
11.1 C
-0.64 C
1964
12.2 C
+0.45 C
1965
11.6 C
-0.16 C
1966
10.9 C
-0.88 C
1967
11.1 C
-0.70 C
1968
11.2 C
-0.60 C
1969
11.0 C
-0.74 C
1970
11.7 C
-0.09 C
1971
11.5 C
-0.27 C
1972
11.1 C
-0.71 C
1973
12.4 C
+0.66 C
1974
11.4 C
-0.35 C
1975
11.8 C
+0.07 C
1976
10.4 C
-1.32 C
1977
11.4 C
-0.34 C
1978
10.7 C
-1.11 C
The fitted trend in annual mean temperature here over 1926 to 1978 is -0.1 C (-0.2 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.4 to 0.1) per decade. The slope is a straight line fitted to 48 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Pittsburgh WSO City
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.1 C (-0.2 to 0.1) per decade
-0.1 F (-0.4 to 0.1) per decade
1926 to 1978
48
Not clearly different from zero
Mean daily maximum
-0.05 C (-0.20 to 0.11) per decade
-0.1 F (-0.4 to 0.2) per decade
1926 to 1978
48
Not clearly different from zero
Mean daily minimum
-0.10 C (-0.23 to 0.03) per decade
-0.18 F (-0.41 to 0.05) per decade
1926 to 1978
48
Not clearly different from zero
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 1979
Yearly extremes at Pittsburgh WSO City: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
37.8 C (100.0 F)
1948
35.0 C (95.0 F)
51
Coldest night (TNn)
-25.6 C (-14.1 F)
1977
-17.8 C (0.0 F)
51
Wettest day (Rx1day)
90.7 mm (3.6 in)
1954
46.7 mm (1.8 in)
51
Wettest five days (Rx5day)
111.3 mm (4.4 in)
1948
76.2 mm (3.0 in)
51
Longest dry spell (CDD)
29 days
1952
16 days
51
Hottest day (TXx)
The hottest day of the year at Pittsburgh WSO City, 1926 to 1979. The record is 37.8 C (100.0 F) in 1948, marked on the chart; the median year is 35.0 C (95.0 F).
Hottest day (TXx) at Pittsburgh WSO City by year
Year
Hottest day (TXx)
1926
36.1 C (97.0 F)
1927
33.3 C (91.9 F)
1928
33.9 C (93.0 F)
1929
33.9 C (93.0 F)
1930
37.2 C (99.0 F)
1931
36.1 C (97.0 F)
1932
35.0 C (95.0 F)
1933
36.7 C (98.1 F)
1934
36.7 C (98.1 F)
1935
32.2 C (90.0 F)
1939
35.6 C (96.1 F)
1940
35.6 C (96.1 F)
1941
37.2 C (99.0 F)
1942
36.7 C (98.1 F)
1943
35.0 C (95.0 F)
1944
36.1 C (97.0 F)
1945
35.0 C (95.0 F)
1946
34.4 C (93.9 F)
1947
34.4 C (93.9 F)
1948
37.8 C (100.0 F)
1949
36.1 C (97.0 F)
1950
33.9 C (93.0 F)
1951
34.4 C (93.9 F)
1952
37.2 C (99.0 F)
1953
37.8 C (100.0 F)
1954
37.2 C (99.0 F)
1955
35.6 C (96.1 F)
1956
34.4 C (93.9 F)
1957
35.0 C (95.0 F)
1958
33.3 C (91.9 F)
1959
35.0 C (95.0 F)
1960
32.8 C (91.0 F)
1961
33.3 C (91.9 F)
1962
35.6 C (96.1 F)
1963
35.0 C (95.0 F)
1964
34.4 C (93.9 F)
1965
35.0 C (95.0 F)
1966
36.7 C (98.1 F)
1967
33.3 C (91.9 F)
1968
35.0 C (95.0 F)
1969
35.0 C (95.0 F)
1970
33.9 C (93.0 F)
1971
35.6 C (96.1 F)
1972
33.3 C (91.9 F)
1973
35.0 C (95.0 F)
1974
33.3 C (91.9 F)
1975
35.0 C (95.0 F)
1976
32.8 C (91.0 F)
1977
35.0 C (95.0 F)
1978
33.9 C (93.0 F)
1979
33.3 C (91.9 F)
Coldest night (TNn)
The coldest night of the year at Pittsburgh WSO City, 1926 to 1979. The record is -25.6 C (-14.1 F) in 1977, marked on the chart; the median year is -17.8 C (0.0 F).
Coldest night (TNn) at Pittsburgh WSO City by year
Year
Coldest night (TNn)
1926
-19.4 C (-2.9 F)
1927
-17.8 C (0.0 F)
1928
-16.7 C (1.9 F)
1929
-20.0 C (-4.0 F)
1930
-17.8 C (0.0 F)
1931
-10.6 C (12.9 F)
1932
-18.3 C (-0.9 F)
1933
-19.4 C (-2.9 F)
1934
-23.9 C (-11.0 F)
1935
-15.6 C (3.9 F)
1939
-10.6 C (12.9 F)
1940
-20.6 C (-5.1 F)
1941
-12.8 C (9.0 F)
1942
-18.9 C (-2.0 F)
1943
-17.8 C (0.0 F)
1944
-14.4 C (6.1 F)
1945
-17.8 C (0.0 F)
1946
-15.6 C (3.9 F)
1947
-16.7 C (1.9 F)
1948
-17.8 C (0.0 F)
1949
-13.9 C (7.0 F)
1950
-15.6 C (3.9 F)
1951
-21.7 C (-7.1 F)
1952
-11.7 C (10.9 F)
1953
-11.1 C (12.0 F)
1954
-11.7 C (10.9 F)
1955
-16.7 C (1.9 F)
1956
-10.6 C (12.9 F)
1957
-18.3 C (-0.9 F)
1958
-20.6 C (-5.1 F)
1959
-17.8 C (0.0 F)
1960
-16.1 C (3.0 F)
1961
-19.4 C (-2.9 F)
1962
-18.3 C (-0.9 F)
1963
-25.0 C (-13.0 F)
1964
-15.0 C (5.0 F)
1965
-18.3 C (-0.9 F)
1966
-18.9 C (-2.0 F)
1967
-16.7 C (1.9 F)
1968
-20.0 C (-4.0 F)
1969
-16.1 C (3.0 F)
1970
-20.0 C (-4.0 F)
1971
-19.4 C (-2.9 F)
1972
-22.8 C (-9.0 F)
1973
-20.0 C (-4.0 F)
1974
-13.3 C (8.1 F)
1975
-16.1 C (3.0 F)
1976
-18.3 C (-0.9 F)
1977
-25.6 C (-14.1 F)
1978
-16.7 C (1.9 F)
1979
-20.6 C (-5.1 F)
Wettest day (Rx1day)
The wettest day of the year at Pittsburgh WSO City, 1926 to 1979. The record is 90.7 mm (3.6 in) in 1954, marked on the chart; the median year is 46.7 mm (1.8 in).
Wettest day (Rx1day) at Pittsburgh WSO City by year
Year
Wettest day (Rx1day)
1926
40.6 mm (1.6 in)
1927
72.6 mm (2.9 in)
1928
44.2 mm (1.7 in)
1929
81.8 mm (3.2 in)
1930
48.0 mm (1.9 in)
1931
47.5 mm (1.9 in)
1932
35.3 mm (1.4 in)
1933
50.3 mm (2.0 in)
1934
46.0 mm (1.8 in)
1935
30.2 mm (1.2 in)
1939
37.3 mm (1.5 in)
1940
62.0 mm (2.4 in)
1941
61.0 mm (2.4 in)
1942
49.5 mm (1.9 in)
1943
64.3 mm (2.5 in)
1944
39.1 mm (1.5 in)
1945
64.0 mm (2.5 in)
1946
35.6 mm (1.4 in)
1947
41.9 mm (1.6 in)
1948
44.7 mm (1.8 in)
1949
41.4 mm (1.6 in)
1950
60.5 mm (2.4 in)
1951
34.0 mm (1.3 in)
1952
59.4 mm (2.3 in)
1953
46.7 mm (1.8 in)
1954
90.7 mm (3.6 in)
1955
65.0 mm (2.6 in)
1956
84.8 mm (3.3 in)
1957
47.0 mm (1.9 in)
1958
34.5 mm (1.4 in)
1959
44.2 mm (1.7 in)
1960
42.4 mm (1.7 in)
1961
48.0 mm (1.9 in)
1962
58.2 mm (2.3 in)
1963
47.8 mm (1.9 in)
1964
55.9 mm (2.2 in)
1965
32.5 mm (1.3 in)
1966
51.1 mm (2.0 in)
1967
64.3 mm (2.5 in)
1968
32.8 mm (1.3 in)
1969
38.1 mm (1.5 in)
1970
42.2 mm (1.7 in)
1971
54.9 mm (2.2 in)
1972
42.2 mm (1.7 in)
1973
34.8 mm (1.4 in)
1974
46.0 mm (1.8 in)
1975
51.6 mm (2.0 in)
1976
28.2 mm (1.1 in)
1977
49.8 mm (2.0 in)
1978
35.3 mm (1.4 in)
1979
46.5 mm (1.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Pittsburgh WSO City, 1926 to 1979. The record is 111.3 mm (4.4 in) in 1948, marked on the chart; the median year is 76.2 mm (3.0 in).
Wettest five days (Rx5day) at Pittsburgh WSO City by year
Year
Wettest five days (Rx5day)
1926
90.4 mm (3.6 in)
1927
90.4 mm (3.6 in)
1928
72.6 mm (2.9 in)
1929
86.4 mm (3.4 in)
1930
62.7 mm (2.5 in)
1931
89.2 mm (3.5 in)
1932
70.2 mm (2.8 in)
1933
62.0 mm (2.4 in)
1934
93.7 mm (3.7 in)
1935
54.6 mm (2.1 in)
1939
74.3 mm (2.9 in)
1940
77.3 mm (3.0 in)
1941
102.1 mm (4.0 in)
1942
78.5 mm (3.1 in)
1943
103.6 mm (4.1 in)
1944
62.9 mm (2.5 in)
1945
86.4 mm (3.4 in)
1946
88.4 mm (3.5 in)
1947
90.4 mm (3.6 in)
1948
111.3 mm (4.4 in)
1949
76.5 mm (3.0 in)
1950
91.2 mm (3.6 in)
1951
89.2 mm (3.5 in)
1952
72.4 mm (2.9 in)
1953
61.5 mm (2.4 in)
1954
110.2 mm (4.3 in)
1955
107.2 mm (4.2 in)
1956
95.2 mm (3.7 in)
1957
76.2 mm (3.0 in)
1958
88.0 mm (3.5 in)
1959
63.3 mm (2.5 in)
1960
82.0 mm (3.2 in)
1961
65.9 mm (2.6 in)
1962
110.8 mm (4.4 in)
1963
74.2 mm (2.9 in)
1964
75.6 mm (3.0 in)
1965
55.9 mm (2.2 in)
1966
63.6 mm (2.5 in)
1967
104.9 mm (4.1 in)
1968
59.4 mm (2.3 in)
1969
53.6 mm (2.1 in)
1970
74.9 mm (2.9 in)
1971
80.6 mm (3.2 in)
1972
105.2 mm (4.1 in)
1973
60.8 mm (2.4 in)
1974
58.2 mm (2.3 in)
1975
72.3 mm (2.8 in)
1976
53.3 mm (2.1 in)
1977
67.6 mm (2.7 in)
1978
57.9 mm (2.3 in)
1979
76.2 mm (3.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Pittsburgh WSO City, 1926 to 1979. The record is 29 days in 1952, marked on the chart; the median year is 16 days.
Longest dry spell (CDD) at Pittsburgh WSO City by year
Year
Longest dry spell (CDD)
1926
15 days
1927
14 days
1928
13 days
1929
14 days
1930
13 days
1931
17 days
1932
25 days
1933
18 days
1934
24 days
1935
15 days
1939
16 days
1940
13 days
1941
20 days
1942
16 days
1943
27 days
1944
18 days
1945
12 days
1946
13 days
1947
19 days
1948
18 days
1949
13 days
1950
18 days
1951
14 days
1952
29 days
1953
24 days
1954
14 days
1955
23 days
1956
12 days
1957
17 days
1958
15 days
1959
29 days
1960
12 days
1961
13 days
1962
19 days
1963
27 days
1964
22 days
1965
16 days
1966
15 days
1967
25 days
1968
21 days
1969
13 days
1970
17 days
1971
16 days
1972
9 days
1973
14 days
1974
15 days
1975
11 days
1976
25 days
1977
17 days
1978
12 days
1979
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
48 years with a frost
Across 48 years with a frost, the median last spring frost at Pittsburgh WSO City falls on 16 April and the median first autumn frost on 3 November, which leaves a median of 198 days between them.
Fitted over all years, the growing season changes by +0.3 days per decade at this station.
Frost dates and growing season at Pittsburgh WSO City
Measure
Median, all years
Earliest period
Recent period (1949 to 1978)
Recent against earliest
Fitted trend
Last spring frost
16 April
n/a
15 April
n/a
-0.2 days per decade
First autumn frost
3 November
n/a
2 November
n/a
0.0 days per decade
Growing days
198 days
n/a
199 days
n/a
+0.3 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
48 years, 1926 to 1978
A day with at least 47.2 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 97.2 mm (3.8 in) of rain is expected about once in 100 years.
Rainfall return levels at Pittsburgh WSO City: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
47.2 mm (1.9 in)
5 years
59.6 mm (2.3 in)
10 years
68.2 mm (2.7 in)
25 years
79.5 mm (3.1 in)
50 years
88.3 mm (3.5 in)
Longer than the 48 years of record
100 years
97.2 mm (3.8 in)
Longer than the 48 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, 48 years of values from 1926 to 1978.
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: 90.7 mm (3.6 in) in 1954; 84.8 mm (3.3 in) in 1956; 81.8 mm (3.2 in) in 1929.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Pittsburgh WSO City, at 1966. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1966 ran 0.2 C (0.4 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Pittsburgh WSO City, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1966
-0.2
-0.4
likely
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 Pittsburgh WSO City standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Pittsburgh WSO City 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.