Record envelope, standing records and threshold days for Johnstown (USC00364385), Pennsylvania, United States, with 102 years of record.
Key Facts for Johnstown
Johnstown (USC00364385) is a weather station in Pennsylvania, United States at 40.33 latitude and -78.92 longitude, 370 m (1,214 ft) above sea level.
The station reports from 1892 to 1993, 102 years of record.
1,464 records set at Johnstown still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Johnstown set a daily record precipitation of 38.9 mm (1.5 in) on 9 June 1993.
About the Station
Location: Pennsylvania, United States, 40.33 latitude, -78.92 longitude.
Elevation: 370 m (1,214 ft).
Period of record: 1892 to 1993, 102 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 Johnstown. 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 Johnstown, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
26.7 C (80.1 F)
-27.8 C (-18.0 F)
n/a
n/a
Feb
25.0 C (77.0 F)
-27.2 C (-17.0 F)
n/a
n/a
Mar
30.0 C (86.0 F)
-18.9 C (-2.0 F)
n/a
n/a
Apr
35.0 C (95.0 F)
-12.8 C (9.0 F)
n/a
n/a
May
37.2 C (99.0 F)
-3.3 C (26.1 F)
n/a
n/a
Jun
38.9 C (102.0 F)
0.6 C (33.1 F)
n/a
n/a
Jul
40.0 C (104.0 F)
3.9 C (39.0 F)
n/a
n/a
Aug
39.4 C (102.9 F)
1.7 C (35.1 F)
n/a
n/a
Sep
40.0 C (104.0 F)
-3.9 C (25.0 F)
n/a
n/a
Oct
34.4 C (93.9 F)
-7.2 C (19.0 F)
n/a
n/a
Nov
28.3 C (82.9 F)
-17.2 C (1.0 F)
n/a
n/a
Dec
24.4 C (75.9 F)
-26.1 C (-15.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Johnstown still stand. 1925 holds the most, with 33.
Standing records at Johnstown by the year they were set
Year set
Standing records
1894
23
1895
10
1896
14
1897
7
1898
10
1899
20
1900
20
1901
17
1902
10
1903
10
1904
11
1905
9
1906
11
1907
16
1908
11
1909
8
1910
6
1911
23
1912
9
1913
11
1914
26
1915
12
1916
11
1917
21
1918
29
1919
12
1920
9
1921
9
1922
13
1923
21
1924
11
1925
33
1926
18
1927
15
1928
8
1929
20
1930
32
1931
10
1932
22
1933
22
1934
12
1935
13
1936
17
1937
7
1938
9
1939
12
1940
28
1941
16
1942
16
1943
27
1944
15
1945
15
1946
12
1947
14
1948
11
1949
21
1950
21
1951
15
1952
19
1953
10
1954
14
1955
15
1956
23
1957
22
1958
11
1959
11
1960
15
1961
9
1962
13
1963
25
1964
12
1965
13
1966
14
1967
12
1968
15
1969
10
1970
14
1971
5
1972
19
1973
6
1974
15
1975
7
1976
18
1977
28
1978
15
1979
14
1980
11
1981
7
1982
14
1983
17
1984
12
1985
10
1986
14
1987
7
1988
16
1989
15
1990
16
1991
17
1992
10
1993
3
All-Time Record Progression
5 new records
5 all-time records were set at Johnstown between 25 July 1935 and 22 January 1978. Each dot is a new record.
When Johnstown set new all-time records
Date
Kind
Detail
1935-07-25
Record high minimum temperature
Record high minimum temperature 25.6 C (78.1 F)
1936-07-09
Record high maximum temperature
Record high maximum temperature 40.0 C (104.0 F)
1949-06-26
Record high minimum temperature
Record high minimum temperature 26.7 C (80.1 F)
1977-07-20
Record daily precipitation
Record daily precipitation 222.3 mm (8.8 in)
1978-01-22
Record daily snowfall
Record daily snowfall 47.5 cm (18.7 in)
Wettest Day of Each Month
Jul: 222.3 mm (8.8 in)
The wettest day on record for each calendar month at Johnstown. The most was 222.3 mm (8.8 in) on 20 July 1977.
Record daily precipitation for each month at Johnstown
Month
Record daily precipitation (mm)
Date
Jan
48.3 mm (1.9 in)
3 January 1913
Feb
54.4 mm (2.1 in)
11 February 1983
Mar
71.9 mm (2.8 in)
21 March 1912
Apr
83.8 mm (3.3 in)
9 April 1942
May
76.2 mm (3.0 in)
19 May 1966
Jun
113.3 mm (4.5 in)
16 June 1912
Jul
222.3 mm (8.8 in)
20 July 1977
Aug
82.0 mm (3.2 in)
2 August 1946
Sep
69.1 mm (2.7 in)
11 September 1905
Oct
92.7 mm (3.6 in)
16 October 1954
Nov
68.6 mm (2.7 in)
22 November 1952
Dec
53.3 mm (2.1 in)
2 December 1974
Period of Record Coverage
1894 to 1993
Complete yearUnder 90 percent of days
100 years of record at Johnstown, 1894 to 1993. 11 years have data for under 90 percent of days and are left out of rankings: 1895, 1896, 1905, 1909, 1910, 1929, 1936, 1977 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 80 complete years at Johnstown, 1894 to 1990. Blue stripes are years cooler than the station's own mean of 10.8 C (51.5 F); red stripes are warmer. The coolest year was 1940, at 8.8 C (47.9 F), and the warmest was 1949, at 12.4 C (54.3 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Johnstown as warming stripes, 1894 to 1990
Year
Annual mean temperature
Difference from the station mean
1894
11.5 C
+0.63 C
1898
11.4 C
+0.53 C
1899
11.2 C
+0.34 C
1900
11.5 C
+0.69 C
1901
10.6 C
-0.25 C
1902
11.0 C
+0.12 C
1903
10.8 C
-0.03 C
1904
9.8 C
-1.01 C
1906
11.2 C
+0.41 C
1907
9.9 C
-0.94 C
1908
11.2 C
+0.36 C
1911
11.8 C
+0.94 C
1912
10.4 C
-0.46 C
1913
11.7 C
+0.86 C
1914
10.4 C
-0.43 C
1915
10.6 C
-0.25 C
1916
10.3 C
-0.49 C
1917
9.1 C
-1.78 C
1918
10.8 C
-0.03 C
1919
11.3 C
+0.44 C
1920
10.2 C
-0.66 C
1921
12.4 C
+1.53 C
1922
11.7 C
+0.82 C
1923
11.0 C
+0.18 C
1924
9.9 C
-0.97 C
1925
11.0 C
+0.12 C
1926
10.2 C
-0.66 C
1927
11.1 C
+0.29 C
1930
11.3 C
+0.50 C
1931
12.2 C
+1.38 C
1932
11.6 C
+0.74 C
1934
11.2 C
+0.32 C
1935
10.9 C
+0.09 C
1937
11.1 C
+0.22 C
1938
11.9 C
+1.08 C
1939
12.0 C
+1.18 C
1940
8.8 C
-2.02 C
1941
10.1 C
-0.76 C
1942
9.9 C
-0.90 C
1943
9.5 C
-1.38 C
1944
10.0 C
-0.86 C
1945
10.7 C
-0.17 C
1946
11.7 C
+0.87 C
1947
11.0 C
+0.12 C
1948
11.1 C
+0.25 C
1949
12.4 C
+1.56 C
1950
10.6 C
-0.22 C
1951
11.1 C
+0.30 C
1952
11.5 C
+0.69 C
1953
12.1 C
+1.24 C
1954
11.3 C
+0.51 C
1956
10.5 C
-0.34 C
1957
10.1 C
-0.73 C
1958
9.7 C
-1.11 C
1959
11.2 C
+0.41 C
1960
10.1 C
-0.74 C
1961
9.7 C
-1.18 C
1962
9.9 C
-0.95 C
1963
9.5 C
-1.30 C
1964
10.7 C
-0.16 C
1965
11.0 C
+0.19 C
1966
10.1 C
-0.71 C
1967
10.5 C
-0.30 C
1968
10.6 C
-0.25 C
1969
10.3 C
-0.51 C
1970
10.8 C
-0.06 C
1972
10.3 C
-0.57 C
1974
10.7 C
-0.09 C
1975
11.4 C
+0.55 C
1976
10.1 C
-0.74 C
1981
10.2 C
-0.66 C
1982
10.7 C
-0.09 C
1983
10.2 C
-0.59 C
1984
11.3 C
+0.43 C
1985
11.3 C
+0.49 C
1986
11.6 C
+0.79 C
1987
12.1 C
+1.24 C
1988
11.4 C
+0.52 C
1989
11.0 C
+0.17 C
1990
12.2 C
+1.38 C
The fitted trend in annual mean temperature here over 1894 to 1990 is -0.01 C (-0.07 to 0.06) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.01 F (-0.13 to 0.10) per decade. The slope is a straight line fitted to 80 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Johnstown
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.01 C (-0.07 to 0.06) per decade
-0.01 F (-0.13 to 0.10) per decade
1894 to 1990
80
Not clearly different from zero
Mean daily maximum
0.02 C (-0.06 to 0.09) per decade
0.03 F (-0.11 to 0.17) per decade
1894 to 1990
80
Not clearly different from zero
Mean daily minimum
-0.03 C (-0.09 to 0.03) per decade
-0.1 F (-0.2 to 0.1) per decade
1894 to 1990
80
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
1892 to 1993
Yearly extremes at Johnstown: 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)
1936
36.1 C (97.0 F)
100
Coldest night (TNn)
-27.8 C (-18.0 F)
1912
-19.4 C (-2.9 F)
100
Wettest day (Rx1day)
222.3 mm (8.8 in)
1977
51.1 mm (2.0 in)
102
Wettest five days (Rx5day)
267.0 mm (10.5 in)
1977
87.8 mm (3.5 in)
102
Longest dry spell (CDD)
30 days
1924
14 days
102
Hottest day (TXx)
The hottest day of the year at Johnstown, 1892 to 1993. The record is 40.0 C (104.0 F) in 1936, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Johnstown by year
Year
Hottest day (TXx)
1892
n/a
1893
n/a
1894
37.2 C (99.0 F)
1895
38.9 C (102.0 F)
1896
35.0 C (95.0 F)
1897
37.2 C (99.0 F)
1898
37.8 C (100.0 F)
1899
36.1 C (97.0 F)
1900
36.7 C (98.1 F)
1901
36.7 C (98.1 F)
1902
36.1 C (97.0 F)
1903
33.3 C (91.9 F)
1904
35.0 C (95.0 F)
1905
35.0 C (95.0 F)
1906
35.0 C (95.0 F)
1907
32.8 C (91.0 F)
1908
36.7 C (98.1 F)
1909
35.6 C (96.1 F)
1910
34.4 C (93.9 F)
1911
38.3 C (100.9 F)
1912
35.6 C (96.1 F)
1913
36.7 C (98.1 F)
1914
36.1 C (97.0 F)
1915
35.0 C (95.0 F)
1916
36.1 C (97.0 F)
1917
36.1 C (97.0 F)
1918
39.4 C (102.9 F)
1919
37.2 C (99.0 F)
1920
33.3 C (91.9 F)
1921
36.1 C (97.0 F)
1922
36.7 C (98.1 F)
1923
37.8 C (100.0 F)
1924
36.7 C (98.1 F)
1925
37.8 C (100.0 F)
1926
38.3 C (100.9 F)
1927
35.6 C (96.1 F)
1928
35.6 C (96.1 F)
1929
36.1 C (97.0 F)
1930
38.9 C (102.0 F)
1931
36.7 C (98.1 F)
1932
36.7 C (98.1 F)
1933
38.3 C (100.9 F)
1934
37.2 C (99.0 F)
1935
35.6 C (96.1 F)
1936
40.0 C (104.0 F)
1937
35.6 C (96.1 F)
1938
34.4 C (93.9 F)
1939
36.1 C (97.0 F)
1940
33.9 C (93.0 F)
1941
33.9 C (93.0 F)
1942
33.9 C (93.0 F)
1943
33.9 C (93.0 F)
1944
35.0 C (95.0 F)
1945
35.6 C (96.1 F)
1946
35.0 C (95.0 F)
1947
35.6 C (96.1 F)
1948
38.3 C (100.9 F)
1949
37.2 C (99.0 F)
1950
35.6 C (96.1 F)
1951
35.6 C (96.1 F)
1952
37.2 C (99.0 F)
1953
40.0 C (104.0 F)
1954
36.1 C (97.0 F)
1955
36.7 C (98.1 F)
1956
35.6 C (96.1 F)
1957
36.7 C (98.1 F)
1958
34.4 C (93.9 F)
1959
36.1 C (97.0 F)
1960
32.8 C (91.0 F)
1961
35.0 C (95.0 F)
1962
35.6 C (96.1 F)
1963
35.6 C (96.1 F)
1964
36.1 C (97.0 F)
1965
37.2 C (99.0 F)
1966
37.8 C (100.0 F)
1967
35.0 C (95.0 F)
1968
35.6 C (96.1 F)
1969
36.1 C (97.0 F)
1970
34.4 C (93.9 F)
1971
36.7 C (98.1 F)
1972
36.1 C (97.0 F)
1973
38.3 C (100.9 F)
1974
35.6 C (96.1 F)
1975
37.8 C (100.0 F)
1976
35.0 C (95.0 F)
1977
36.1 C (97.0 F)
1978
35.0 C (95.0 F)
1979
33.9 C (93.0 F)
1980
36.7 C (98.1 F)
1981
35.0 C (95.0 F)
1982
35.0 C (95.0 F)
1983
36.7 C (98.1 F)
1984
35.0 C (95.0 F)
1985
34.4 C (93.9 F)
1986
35.6 C (96.1 F)
1987
36.1 C (97.0 F)
1988
39.4 C (102.9 F)
1989
35.6 C (96.1 F)
1990
34.4 C (93.9 F)
1991
36.7 C (98.1 F)
1992
33.9 C (93.0 F)
1993
36.7 C (98.1 F)
Coldest night (TNn)
The coldest night of the year at Johnstown, 1892 to 1993. The record is -27.8 C (-18.0 F) in 1912, marked on the chart; the median year is -19.4 C (-2.9 F).
Coldest night (TNn) at Johnstown by year
Year
Coldest night (TNn)
1892
n/a
1893
n/a
1894
-18.9 C (-2.0 F)
1895
-17.8 C (0.0 F)
1896
-15.0 C (5.0 F)
1897
-22.2 C (-8.0 F)
1898
-20.0 C (-4.0 F)
1899
-27.2 C (-17.0 F)
1900
-21.7 C (-7.1 F)
1901
-18.3 C (-0.9 F)
1902
-18.9 C (-2.0 F)
1903
-19.4 C (-2.9 F)
1904
-26.1 C (-15.0 F)
1905
-24.4 C (-11.9 F)
1906
-18.9 C (-2.0 F)
1907
-23.3 C (-9.9 F)
1908
-22.8 C (-9.0 F)
1909
-15.0 C (5.0 F)
1910
-15.6 C (3.9 F)
1911
-15.6 C (3.9 F)
1912
-27.8 C (-18.0 F)
1913
-15.0 C (5.0 F)
1914
-23.3 C (-9.9 F)
1915
-17.8 C (0.0 F)
1916
-20.0 C (-4.0 F)
1917
-23.9 C (-11.0 F)
1918
-23.3 C (-9.9 F)
1919
-18.9 C (-2.0 F)
1920
-17.8 C (0.0 F)
1921
-16.1 C (3.0 F)
1922
-17.8 C (0.0 F)
1923
-16.7 C (1.9 F)
1924
-20.6 C (-5.1 F)
1925
-21.7 C (-7.1 F)
1926
-18.9 C (-2.0 F)
1927
-17.8 C (0.0 F)
1928
-16.7 C (1.9 F)
1929
-16.1 C (3.0 F)
1930
-17.2 C (1.0 F)
1931
-13.3 C (8.1 F)
1932
-16.1 C (3.0 F)
1933
-17.8 C (0.0 F)
1934
-25.0 C (-13.0 F)
1935
-19.4 C (-2.9 F)
1936
-24.4 C (-11.9 F)
1937
-15.0 C (5.0 F)
1938
-16.1 C (3.0 F)
1939
-16.1 C (3.0 F)
1940
-21.1 C (-6.0 F)
1941
-18.9 C (-2.0 F)
1942
-23.3 C (-9.9 F)
1943
-23.3 C (-9.9 F)
1944
-21.1 C (-6.0 F)
1945
-22.2 C (-8.0 F)
1946
-21.7 C (-7.1 F)
1947
-21.1 C (-6.0 F)
1948
-22.2 C (-8.0 F)
1949
-15.0 C (5.0 F)
1950
-20.0 C (-4.0 F)
1951
-18.3 C (-0.9 F)
1952
-13.3 C (8.1 F)
1953
-11.7 C (10.9 F)
1954
-18.9 C (-2.0 F)
1955
-20.6 C (-5.1 F)
1956
-13.9 C (7.0 F)
1957
-21.7 C (-7.1 F)
1958
-22.2 C (-8.0 F)
1959
-17.8 C (0.0 F)
1960
-20.0 C (-4.0 F)
1961
-23.3 C (-9.9 F)
1962
-20.0 C (-4.0 F)
1963
-25.6 C (-14.1 F)
1964
-18.9 C (-2.0 F)
1965
-19.4 C (-2.9 F)
1966
-21.7 C (-7.1 F)
1967
-18.3 C (-0.9 F)
1968
-22.2 C (-8.0 F)
1969
-17.8 C (0.0 F)
1970
-19.4 C (-2.9 F)
1971
-20.0 C (-4.0 F)
1972
-21.7 C (-7.1 F)
1973
-19.4 C (-2.9 F)
1974
-12.8 C (9.0 F)
1975
-18.3 C (-0.9 F)
1976
-20.0 C (-4.0 F)
1977
-25.6 C (-14.1 F)
1978
-22.8 C (-9.0 F)
1979
-21.1 C (-6.0 F)
1980
-18.9 C (-2.0 F)
1981
-20.0 C (-4.0 F)
1982
-26.1 C (-15.0 F)
1983
-26.1 C (-15.0 F)
1984
-22.8 C (-9.0 F)
1985
-26.7 C (-16.1 F)
1986
-17.2 C (1.0 F)
1987
-16.7 C (1.9 F)
1988
-19.4 C (-2.9 F)
1989
-20.6 C (-5.1 F)
1990
-18.9 C (-2.0 F)
1991
-13.3 C (8.1 F)
1992
-17.8 C (0.0 F)
1993
-15.6 C (3.9 F)
Wettest day (Rx1day)
The wettest day of the year at Johnstown, 1892 to 1993. The record is 222.3 mm (8.8 in) in 1977, marked on the chart; the median year is 51.1 mm (2.0 in).
Wettest day (Rx1day) at Johnstown by year
Year
Wettest day (Rx1day)
1892
27.9 mm (1.1 in)
1893
35.6 mm (1.4 in)
1894
51.1 mm (2.0 in)
1895
61.0 mm (2.4 in)
1896
55.4 mm (2.2 in)
1897
62.7 mm (2.5 in)
1898
58.9 mm (2.3 in)
1899
59.4 mm (2.3 in)
1900
58.4 mm (2.3 in)
1901
52.3 mm (2.1 in)
1902
37.3 mm (1.5 in)
1903
56.1 mm (2.2 in)
1904
50.8 mm (2.0 in)
1905
69.1 mm (2.7 in)
1906
67.1 mm (2.6 in)
1907
45.0 mm (1.8 in)
1908
68.6 mm (2.7 in)
1909
46.2 mm (1.8 in)
1910
35.6 mm (1.4 in)
1911
72.4 mm (2.9 in)
1912
113.3 mm (4.5 in)
1913
49.3 mm (1.9 in)
1914
61.0 mm (2.4 in)
1915
38.1 mm (1.5 in)
1916
51.8 mm (2.0 in)
1917
53.6 mm (2.1 in)
1918
44.7 mm (1.8 in)
1919
41.9 mm (1.6 in)
1920
40.1 mm (1.6 in)
1921
48.0 mm (1.9 in)
1922
36.6 mm (1.4 in)
1923
45.5 mm (1.8 in)
1924
56.9 mm (2.2 in)
1925
53.6 mm (2.1 in)
1926
44.7 mm (1.8 in)
1927
60.2 mm (2.4 in)
1928
43.4 mm (1.7 in)
1929
73.7 mm (2.9 in)
1930
47.0 mm (1.9 in)
1931
61.0 mm (2.4 in)
1932
56.6 mm (2.2 in)
1933
33.5 mm (1.3 in)
1934
62.5 mm (2.5 in)
1935
65.3 mm (2.6 in)
1936
58.4 mm (2.3 in)
1937
50.3 mm (2.0 in)
1938
29.5 mm (1.2 in)
1939
56.9 mm (2.2 in)
1940
46.0 mm (1.8 in)
1941
56.4 mm (2.2 in)
1942
83.8 mm (3.3 in)
1943
40.1 mm (1.6 in)
1944
47.5 mm (1.9 in)
1945
108.5 mm (4.3 in)
1946
82.0 mm (3.2 in)
1947
40.4 mm (1.6 in)
1948
49.3 mm (1.9 in)
1949
51.1 mm (2.0 in)
1950
60.2 mm (2.4 in)
1951
41.9 mm (1.6 in)
1952
68.6 mm (2.7 in)
1953
58.4 mm (2.3 in)
1954
92.7 mm (3.6 in)
1955
42.2 mm (1.7 in)
1956
45.7 mm (1.8 in)
1957
31.2 mm (1.2 in)
1958
30.0 mm (1.2 in)
1959
48.0 mm (1.9 in)
1960
48.8 mm (1.9 in)
1961
35.6 mm (1.4 in)
1962
51.1 mm (2.0 in)
1963
38.1 mm (1.5 in)
1964
103.9 mm (4.1 in)
1965
45.2 mm (1.8 in)
1966
76.2 mm (3.0 in)
1967
63.5 mm (2.5 in)
1968
45.7 mm (1.8 in)
1969
47.0 mm (1.9 in)
1970
50.8 mm (2.0 in)
1971
50.8 mm (2.0 in)
1972
69.9 mm (2.8 in)
1973
38.6 mm (1.5 in)
1974
53.3 mm (2.1 in)
1975
54.6 mm (2.1 in)
1976
61.0 mm (2.4 in)
1977
222.3 mm (8.8 in)
1978
62.0 mm (2.4 in)
1979
49.8 mm (2.0 in)
1980
55.9 mm (2.2 in)
1981
59.4 mm (2.3 in)
1982
49.3 mm (1.9 in)
1983
54.4 mm (2.1 in)
1984
39.9 mm (1.6 in)
1985
53.1 mm (2.1 in)
1986
53.3 mm (2.1 in)
1987
51.3 mm (2.0 in)
1988
59.4 mm (2.3 in)
1989
39.1 mm (1.5 in)
1990
45.7 mm (1.8 in)
1991
50.8 mm (2.0 in)
1992
43.2 mm (1.7 in)
1993
38.9 mm (1.5 in)
Wettest five days (Rx5day)
The wettest five days of the year at Johnstown, 1892 to 1993. The record is 267.0 mm (10.5 in) in 1977, marked on the chart; the median year is 87.8 mm (3.5 in).
Wettest five days (Rx5day) at Johnstown by year
Year
Wettest five days (Rx5day)
1892
56.3 mm (2.2 in)
1893
76.3 mm (3.0 in)
1894
101.6 mm (4.0 in)
1895
74.7 mm (2.9 in)
1896
70.1 mm (2.8 in)
1897
62.7 mm (2.5 in)
1898
92.0 mm (3.6 in)
1899
86.6 mm (3.4 in)
1900
81.2 mm (3.2 in)
1901
81.9 mm (3.2 in)
1902
96.0 mm (3.8 in)
1903
95.8 mm (3.8 in)
1904
123.7 mm (4.9 in)
1905
88.3 mm (3.5 in)
1906
119.6 mm (4.7 in)
1907
93.3 mm (3.7 in)
1908
96.3 mm (3.8 in)
1909
63.2 mm (2.5 in)
1910
59.9 mm (2.4 in)
1911
85.1 mm (3.4 in)
1912
128.0 mm (5.0 in)
1913
82.6 mm (3.3 in)
1914
103.7 mm (4.1 in)
1915
81.9 mm (3.2 in)
1916
87.3 mm (3.4 in)
1917
72.6 mm (2.9 in)
1918
72.1 mm (2.8 in)
1919
95.8 mm (3.8 in)
1920
104.9 mm (4.1 in)
1921
98.8 mm (3.9 in)
1922
72.1 mm (2.8 in)
1923
91.5 mm (3.6 in)
1924
89.5 mm (3.5 in)
1925
86.9 mm (3.4 in)
1926
117.8 mm (4.6 in)
1927
94.0 mm (3.7 in)
1928
65.2 mm (2.6 in)
1929
113.8 mm (4.5 in)
1930
67.9 mm (2.7 in)
1931
84.2 mm (3.3 in)
1932
61.2 mm (2.4 in)
1933
77.4 mm (3.0 in)
1934
86.6 mm (3.4 in)
1935
116.6 mm (4.6 in)
1936
100.8 mm (4.0 in)
1937
110.0 mm (4.3 in)
1938
73.2 mm (2.9 in)
1939
82.1 mm (3.2 in)
1940
82.3 mm (3.2 in)
1941
96.3 mm (3.8 in)
1942
106.4 mm (4.2 in)
1943
76.0 mm (3.0 in)
1944
91.1 mm (3.6 in)
1945
109.8 mm (4.3 in)
1946
95.5 mm (3.8 in)
1947
92.2 mm (3.6 in)
1948
115.9 mm (4.6 in)
1949
70.4 mm (2.8 in)
1950
83.6 mm (3.3 in)
1951
83.8 mm (3.3 in)
1952
95.5 mm (3.8 in)
1953
68.8 mm (2.7 in)
1954
96.3 mm (3.8 in)
1955
89.2 mm (3.5 in)
1956
60.9 mm (2.4 in)
1957
73.6 mm (2.9 in)
1958
81.8 mm (3.2 in)
1959
60.2 mm (2.4 in)
1960
101.2 mm (4.0 in)
1961
66.1 mm (2.6 in)
1962
104.9 mm (4.1 in)
1963
65.1 mm (2.6 in)
1964
106.0 mm (4.2 in)
1965
71.4 mm (2.8 in)
1966
78.2 mm (3.1 in)
1967
150.4 mm (5.9 in)
1968
62.4 mm (2.5 in)
1969
73.8 mm (2.9 in)
1970
107.7 mm (4.2 in)
1971
132.2 mm (5.2 in)
1972
120.9 mm (4.8 in)
1973
59.9 mm (2.4 in)
1974
121.6 mm (4.8 in)
1975
123.0 mm (4.8 in)
1976
91.5 mm (3.6 in)
1977
267.0 mm (10.5 in)
1978
78.5 mm (3.1 in)
1979
75.7 mm (3.0 in)
1980
105.4 mm (4.1 in)
1981
133.4 mm (5.3 in)
1982
60.2 mm (2.4 in)
1983
78.8 mm (3.1 in)
1984
92.9 mm (3.7 in)
1985
99.0 mm (3.9 in)
1986
75.4 mm (3.0 in)
1987
88.4 mm (3.5 in)
1988
199.1 mm (7.8 in)
1989
91.3 mm (3.6 in)
1990
115.8 mm (4.6 in)
1991
61.5 mm (2.4 in)
1992
68.3 mm (2.7 in)
1993
65.8 mm (2.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at Johnstown, 1892 to 1993. The record is 30 days in 1924, marked on the chart; the median year is 14 days.
Longest dry spell (CDD) at Johnstown by year
Year
Longest dry spell (CDD)
1892
10 days
1893
14 days
1894
15 days
1895
14 days
1896
15 days
1897
18 days
1898
11 days
1899
19 days
1900
13 days
1901
17 days
1902
15 days
1903
18 days
1904
12 days
1905
12 days
1906
13 days
1907
10 days
1908
28 days
1909
13 days
1910
14 days
1911
9 days
1912
10 days
1913
12 days
1914
14 days
1915
12 days
1916
13 days
1917
19 days
1918
19 days
1919
12 days
1920
25 days
1921
12 days
1922
24 days
1923
17 days
1924
30 days
1925
19 days
1926
13 days
1927
10 days
1928
10 days
1929
14 days
1930
22 days
1931
11 days
1932
19 days
1933
11 days
1934
16 days
1935
14 days
1936
11 days
1937
13 days
1938
13 days
1939
10 days
1940
13 days
1941
18 days
1942
20 days
1943
13 days
1944
20 days
1945
16 days
1946
12 days
1947
18 days
1948
11 days
1949
13 days
1950
15 days
1951
19 days
1952
26 days
1953
24 days
1954
13 days
1955
15 days
1956
19 days
1957
15 days
1958
16 days
1959
15 days
1960
13 days
1961
10 days
1962
15 days
1963
27 days
1964
18 days
1965
11 days
1966
18 days
1967
17 days
1968
12 days
1969
13 days
1970
15 days
1971
16 days
1972
10 days
1973
14 days
1974
13 days
1975
16 days
1976
13 days
1977
17 days
1978
11 days
1979
11 days
1980
14 days
1981
11 days
1982
18 days
1983
11 days
1984
14 days
1985
22 days
1986
9 days
1987
12 days
1988
17 days
1989
9 days
1990
13 days
1991
16 days
1992
13 days
1993
9 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
80 years with a frost
Across 80 years with a frost, the median last spring frost at Johnstown falls on 29 April and the median first autumn frost on 13 October, which leaves a median of 171 days between them.
In 1954 to 1990 the median growing season was 172 days. The two periods have the same number of growing days.
Fitted over all years, the growing season changes by +0.1 days per decade at this station.
Frost dates and growing season at Johnstown
Measure
Median, all years
Earliest period (1894 to 1931)
Recent period (1954 to 1990)
Recent against earliest
Fitted trend
Last spring frost
29 April
29 April
30 April
1 day later
+0.2 days per decade
First autumn frost
13 October
14 October
15 October
1 day later
+0.3 days per decade
Growing days
171 days
172 days
172 days
no change
+0.1 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
96 years, 1893 to 1992
A day with at least 50.8 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 103.8 mm (4.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Johnstown: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
50.8 mm (2.0 in)
5 years
63.7 mm (2.5 in)
10 years
72.7 mm (2.9 in)
25 years
84.7 mm (3.3 in)
50 years
94.1 mm (3.7 in)
100 years
103.8 mm (4.1 in)
Longer than the 96 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, 96 years of values from 1893 to 1992.
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 1912; 108.5 mm (4.3 in) in 1945; 103.9 mm (4.1 in) in 1964.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Johnstown, at 1934 and 1940. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1934 ran 0.3 C (0.6 F) higher than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1940 ran 0.7 C (1.2 F) lower than in the years before (possible change).
Suspected changes in the annual mean temperature at Johnstown, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1934
+0.3
+0.6
likely
5
1940
-0.7
-1.2
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 Johnstown standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Johnstown 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.