Record envelope, standing records and threshold days for Lock Haven (USC00365104), Pennsylvania, United States, with 88 years of record.
Key Facts for Lock Haven
Lock Haven (USC00365104) is a weather station in Pennsylvania, United States at 41.13 latitude and -77.42 longitude, 168 m (551 ft) above sea level.
The station reports from 1890 to 1977, 88 years of record.
1,464 records set at Lock Haven still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Lock Haven set a monthly record daily snowfall of 2.5 cm (1.0 in) on 17 October 1977.
About the Station
Location: Pennsylvania, United States, 41.13 latitude, -77.42 longitude.
Elevation: 168 m (551 ft).
Period of record: 1890 to 1977, 88 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 Lock Haven. 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 Lock Haven, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
21.7 C (71.1 F)
-30.0 C (-22.0 F)
n/a
n/a
Feb
23.9 C (75.0 F)
-29.4 C (-20.9 F)
n/a
n/a
Mar
30.0 C (86.0 F)
-21.7 C (-7.1 F)
n/a
n/a
Apr
36.1 C (97.0 F)
-15.0 C (5.0 F)
n/a
n/a
May
38.9 C (102.0 F)
-3.9 C (25.0 F)
n/a
n/a
Jun
40.0 C (104.0 F)
1.1 C (34.0 F)
n/a
n/a
Jul
40.6 C (105.1 F)
-0.6 C (30.9 F)
n/a
n/a
Aug
40.6 C (105.1 F)
0.0 C (32.0 F)
n/a
n/a
Sep
39.4 C (102.9 F)
-3.3 C (26.1 F)
n/a
n/a
Oct
33.9 C (93.0 F)
-7.8 C (18.0 F)
n/a
n/a
Nov
28.9 C (84.0 F)
-15.0 C (5.0 F)
n/a
n/a
Dec
18.9 C (66.0 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 Lock Haven still stand. 1894 holds the most, with 49.
Standing records at Lock Haven by the year they were set
Year set
Standing records
1894
49
1895
36
1896
32
1897
23
1898
15
1899
24
1900
19
1901
13
1902
9
1903
12
1904
21
1905
22
1906
19
1907
14
1908
13
1909
11
1910
14
1911
15
1912
13
1913
24
1914
30
1915
13
1916
16
1917
30
1918
29
1919
7
1920
16
1921
8
1923
7
1924
38
1925
6
1926
14
1927
14
1928
12
1929
19
1930
40
1931
30
1932
28
1933
22
1934
27
1935
14
1936
21
1937
9
1938
17
1939
8
1940
14
1941
15
1942
21
1943
26
1944
15
1945
23
1946
15
1947
24
1948
7
1949
14
1950
32
1951
20
1952
12
1953
15
1954
18
1955
15
1956
17
1957
14
1958
7
1959
11
1960
20
1961
16
1962
20
1963
17
1964
19
1965
11
1966
22
1967
18
1968
11
1969
9
1970
14
1971
1
1972
10
1973
14
1974
13
1975
9
1976
19
1977
13
All-Time Record Progression
3 new records
3 all-time records were set at Lock Haven between 13 July 1926 and 7 November 1953. Each dot is a new record.
When Lock Haven set new all-time records
Date
Kind
Detail
1926-07-13
Record daily precipitation
Record daily precipitation 111.8 mm (4.4 in)
1941-08-16
Record daily precipitation
Record daily precipitation 120.1 mm (4.7 in)
1953-11-07
Record daily snowfall
Record daily snowfall 63.5 cm (25.0 in)
Wettest Day of Each Month
Aug: 120.1 mm (4.7 in)
The wettest day on record for each calendar month at Lock Haven. The most was 120.1 mm (4.7 in) on 16 August 1941.
Record daily precipitation for each month at Lock Haven
Month
Record daily precipitation (mm)
Date
Jan
50.8 mm (2.0 in)
3 January 1914
Feb
52.1 mm (2.1 in)
6 February 1896
Mar
59.9 mm (2.4 in)
14 March 1918
Apr
50.8 mm (2.0 in)
10 April 1918
May
71.1 mm (2.8 in)
28 May 1946
Jun
76.2 mm (3.0 in)
2 June 1916
Jul
111.8 mm (4.4 in)
13 July 1926
Aug
120.1 mm (4.7 in)
16 August 1941
Sep
104.1 mm (4.1 in)
26 September 1975
Oct
87.4 mm (3.4 in)
14 October 1896
Nov
64.5 mm (2.5 in)
26 November 1950
Dec
55.4 mm (2.2 in)
30 December 1942
Period of Record Coverage
1894 to 1977
Complete yearUnder 90 percent of days
84 years of record at Lock Haven, 1894 to 1977. 18 years have data for under 90 percent of days and are left out of rankings: 1900, 1915, 1921, 1922, 1923, 1924, 1925, 1926 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 64 complete years at Lock Haven, 1896 to 1974. Blue stripes are years cooler than the station's own mean of 10.4 C (50.7 F); red stripes are warmer. The coolest year was 1963, at 8.4 C (47.2 F), and the warmest was 1931, at 12.6 C (54.7 F). The strongest colour marks a difference of 2.3 C (4.1 F).
Annual mean temperature at Lock Haven as warming stripes, 1896 to 1974
Year
Annual mean temperature
Difference from the station mean
1896
11.1 C
+0.72 C
1897
10.9 C
+0.46 C
1898
11.6 C
+1.24 C
1899
10.9 C
+0.50 C
1901
10.8 C
+0.39 C
1902
10.7 C
+0.33 C
1903
10.4 C
+0.04 C
1904
9.0 C
-1.40 C
1905
10.2 C
-0.16 C
1906
11.1 C
+0.70 C
1907
9.5 C
-0.90 C
1908
10.6 C
+0.16 C
1909
10.5 C
+0.06 C
1910
10.4 C
+0.01 C
1911
11.2 C
+0.79 C
1912
10.0 C
-0.40 C
1913
11.6 C
+1.15 C
1914
10.2 C
-0.24 C
1916
10.2 C
-0.19 C
1917
8.6 C
-1.80 C
1918
10.2 C
-0.21 C
1919
10.6 C
+0.21 C
1920
9.2 C
-1.16 C
1927
11.4 C
+0.98 C
1928
11.2 C
+0.83 C
1929
11.1 C
+0.65 C
1930
11.8 C
+1.38 C
1931
12.6 C
+2.20 C
1932
12.1 C
+1.70 C
1933
11.7 C
+1.29 C
1934
11.0 C
+0.55 C
1935
10.7 C
+0.27 C
1937
11.0 C
+0.57 C
1938
11.4 C
+1.00 C
1939
11.3 C
+0.87 C
1940
9.6 C
-0.85 C
1941
10.3 C
-0.11 C
1942
9.9 C
-0.47 C
1943
9.8 C
-0.64 C
1944
10.6 C
+0.22 C
1945
10.5 C
+0.08 C
1946
11.2 C
+0.84 C
1947
11.0 C
+0.61 C
1949
11.0 C
+0.55 C
1950
9.4 C
-0.99 C
1951
10.4 C
-0.03 C
1952
11.0 C
+0.62 C
1953
11.4 C
+0.95 C
1954
10.7 C
+0.30 C
1955
10.7 C
+0.26 C
1957
11.0 C
+0.62 C
1958
9.7 C
-0.66 C
1959
11.0 C
+0.55 C
1960
9.1 C
-1.27 C
1961
9.6 C
-0.81 C
1962
8.9 C
-1.52 C
1963
8.4 C
-1.98 C
1964
9.3 C
-1.10 C
1965
9.3 C
-1.08 C
1966
8.9 C
-1.52 C
1967
8.6 C
-1.80 C
1968
9.0 C
-1.42 C
1969
9.2 C
-1.23 C
1974
9.5 C
-0.91 C
The annual mean temperature here has fallen by 0.2 C (0.1 to 0.2) per decade over 1896 to 1974. In Fahrenheit: 0.3 F (0.1 to 0.4) per decade. The slope is a straight line fitted to 64 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Lock Haven
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.2 C (-0.2 to -0.1) per decade
-0.3 F (-0.4 to -0.1) per decade
1896 to 1974
64
Fall
Mean daily maximum
-0.12 C (-0.23 to -0.02) per decade
-0.22 F (-0.41 to -0.03) per decade
1896 to 1974
64
Fall
Mean daily minimum
-0.2 C (-0.3 to -0.1) per decade
-0.3 F (-0.5 to -0.1) per decade
1896 to 1974
64
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
1890 to 1977
Yearly extremes at Lock Haven: 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)
1911
36.7 C (98.1 F)
84
Coldest night (TNn)
-30.0 C (-22.0 F)
1912
-21.1 C (-6.0 F)
84
Wettest day (Rx1day)
120.1 mm (4.7 in)
1941
51.5 mm (2.0 in)
88
Wettest five days (Rx5day)
168.4 mm (6.6 in)
1975
79.9 mm (3.1 in)
88
Longest dry spell (CDD)
31 days
1963
15 days
88
Hottest day (TXx)
The hottest day of the year at Lock Haven, 1890 to 1977. The record is 40.6 C (105.1 F) in 1911, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Lock Haven by year
Year
Hottest day (TXx)
1890
n/a
1891
n/a
1892
n/a
1893
n/a
1894
38.9 C (102.0 F)
1895
39.4 C (102.9 F)
1896
36.1 C (97.0 F)
1897
36.7 C (98.1 F)
1898
38.9 C (102.0 F)
1899
37.8 C (100.0 F)
1900
38.9 C (102.0 F)
1901
38.9 C (102.0 F)
1902
33.9 C (93.0 F)
1903
35.6 C (96.1 F)
1904
37.2 C (99.0 F)
1905
36.7 C (98.1 F)
1906
36.1 C (97.0 F)
1907
33.9 C (93.0 F)
1908
36.7 C (98.1 F)
1909
37.2 C (99.0 F)
1910
37.2 C (99.0 F)
1911
40.6 C (105.1 F)
1912
37.8 C (100.0 F)
1913
36.7 C (98.1 F)
1914
36.7 C (98.1 F)
1915
36.1 C (97.0 F)
1916
38.9 C (102.0 F)
1917
37.8 C (100.0 F)
1918
40.0 C (104.0 F)
1919
37.8 C (100.0 F)
1920
35.6 C (96.1 F)
1921
37.8 C (100.0 F)
1922
23.3 C (73.9 F)
1923
36.7 C (98.1 F)
1924
32.2 C (90.0 F)
1925
25.6 C (78.1 F)
1926
36.7 C (98.1 F)
1927
37.2 C (99.0 F)
1928
36.7 C (98.1 F)
1929
36.7 C (98.1 F)
1930
40.6 C (105.1 F)
1931
40.6 C (105.1 F)
1932
39.4 C (102.9 F)
1933
40.0 C (104.0 F)
1934
38.9 C (102.0 F)
1935
36.1 C (97.0 F)
1936
40.6 C (105.1 F)
1937
36.7 C (98.1 F)
1938
36.1 C (97.0 F)
1939
35.0 C (95.0 F)
1940
35.6 C (96.1 F)
1941
37.8 C (100.0 F)
1942
35.0 C (95.0 F)
1943
37.2 C (99.0 F)
1944
38.9 C (102.0 F)
1945
35.6 C (96.1 F)
1946
35.0 C (95.0 F)
1947
35.0 C (95.0 F)
1948
35.6 C (96.1 F)
1949
38.9 C (102.0 F)
1950
34.4 C (93.9 F)
1951
35.6 C (96.1 F)
1952
38.9 C (102.0 F)
1953
39.4 C (102.9 F)
1954
37.2 C (99.0 F)
1955
38.9 C (102.0 F)
1956
36.7 C (98.1 F)
1957
36.7 C (98.1 F)
1958
33.9 C (93.0 F)
1959
36.1 C (97.0 F)
1960
34.4 C (93.9 F)
1961
33.3 C (91.9 F)
1962
35.6 C (96.1 F)
1963
35.0 C (95.0 F)
1964
35.6 C (96.1 F)
1965
34.4 C (93.9 F)
1966
38.9 C (102.0 F)
1967
33.9 C (93.0 F)
1968
34.4 C (93.9 F)
1969
35.0 C (95.0 F)
1970
33.9 C (93.0 F)
1971
32.2 C (90.0 F)
1972
33.9 C (93.0 F)
1973
37.2 C (99.0 F)
1974
33.3 C (91.9 F)
1975
36.7 C (98.1 F)
1976
34.4 C (93.9 F)
1977
35.6 C (96.1 F)
Coldest night (TNn)
The coldest night of the year at Lock Haven, 1890 to 1977. The record is -30.0 C (-22.0 F) in 1912, marked on the chart; the median year is -21.1 C (-6.0 F).
Coldest night (TNn) at Lock Haven by year
Year
Coldest night (TNn)
1890
n/a
1891
n/a
1892
n/a
1893
n/a
1894
-21.1 C (-6.0 F)
1895
-26.1 C (-15.0 F)
1896
-21.7 C (-7.1 F)
1897
-18.9 C (-2.0 F)
1898
-18.9 C (-2.0 F)
1899
-29.4 C (-20.9 F)
1900
-20.6 C (-5.1 F)
1901
-18.9 C (-2.0 F)
1902
-17.8 C (0.0 F)
1903
-20.6 C (-5.1 F)
1904
-28.9 C (-20.0 F)
1905
-22.8 C (-9.0 F)
1906
-22.2 C (-8.0 F)
1907
-24.4 C (-11.9 F)
1908
-24.4 C (-11.9 F)
1909
-22.8 C (-9.0 F)
1910
-20.0 C (-4.0 F)
1911
-15.0 C (5.0 F)
1912
-30.0 C (-22.0 F)
1913
-15.0 C (5.0 F)
1914
-25.6 C (-14.1 F)
1915
-20.6 C (-5.1 F)
1916
-21.7 C (-7.1 F)
1917
-26.1 C (-15.0 F)
1918
-25.6 C (-14.1 F)
1919
-21.1 C (-6.0 F)
1920
-21.1 C (-6.0 F)
1921
-21.7 C (-7.1 F)
1922
-5.6 C (21.9 F)
1923
-18.3 C (-0.9 F)
1924
-22.2 C (-8.0 F)
1925
-28.3 C (-18.9 F)
1926
-21.7 C (-7.1 F)
1927
-20.6 C (-5.1 F)
1928
-20.0 C (-4.0 F)
1929
-17.2 C (1.0 F)
1930
-18.9 C (-2.0 F)
1931
-18.9 C (-2.0 F)
1932
-17.2 C (1.0 F)
1933
-18.9 C (-2.0 F)
1934
-26.7 C (-16.1 F)
1935
-22.8 C (-9.0 F)
1936
-24.4 C (-11.9 F)
1937
-16.7 C (1.9 F)
1938
-17.2 C (1.0 F)
1939
-16.1 C (3.0 F)
1940
-17.8 C (0.0 F)
1941
-17.2 C (1.0 F)
1942
-26.1 C (-15.0 F)
1943
-22.2 C (-8.0 F)
1944
-22.2 C (-8.0 F)
1945
-23.3 C (-9.9 F)
1946
-20.6 C (-5.1 F)
1947
-17.8 C (0.0 F)
1948
-24.4 C (-11.9 F)
1949
-17.2 C (1.0 F)
1950
-25.0 C (-13.0 F)
1951
-23.9 C (-11.0 F)
1952
-16.7 C (1.9 F)
1953
-15.0 C (5.0 F)
1954
-19.4 C (-2.9 F)
1955
-23.3 C (-9.9 F)
1956
-15.0 C (5.0 F)
1957
-22.8 C (-9.0 F)
1958
-20.0 C (-4.0 F)
1959
-18.9 C (-2.0 F)
1960
-23.9 C (-11.0 F)
1961
-28.3 C (-18.9 F)
1962
-21.7 C (-7.1 F)
1963
-25.6 C (-14.1 F)
1964
-23.3 C (-9.9 F)
1965
-22.2 C (-8.0 F)
1966
-21.1 C (-6.0 F)
1967
-25.0 C (-13.0 F)
1968
-26.1 C (-15.0 F)
1969
-21.1 C (-6.0 F)
1970
-22.8 C (-9.0 F)
1971
1.7 C (35.1 F)
1972
-19.4 C (-2.9 F)
1973
-20.0 C (-4.0 F)
1974
-15.6 C (3.9 F)
1975
-18.9 C (-2.0 F)
1976
-20.0 C (-4.0 F)
1977
-23.3 C (-9.9 F)
Wettest day (Rx1day)
The wettest day of the year at Lock Haven, 1890 to 1977. The record is 120.1 mm (4.7 in) in 1941, marked on the chart; the median year is 51.5 mm (2.0 in).
Wettest day (Rx1day) at Lock Haven by year
Year
Wettest day (Rx1day)
1890
13.5 mm (0.5 in)
1891
45.7 mm (1.8 in)
1892
56.4 mm (2.2 in)
1893
67.3 mm (2.6 in)
1894
51.6 mm (2.0 in)
1895
64.8 mm (2.6 in)
1896
87.4 mm (3.4 in)
1897
46.5 mm (1.8 in)
1898
44.5 mm (1.8 in)
1899
91.4 mm (3.6 in)
1900
51.1 mm (2.0 in)
1901
52.6 mm (2.1 in)
1902
49.8 mm (2.0 in)
1903
45.5 mm (1.8 in)
1904
47.0 mm (1.9 in)
1905
64.8 mm (2.6 in)
1906
50.3 mm (2.0 in)
1907
50.8 mm (2.0 in)
1908
35.6 mm (1.4 in)
1909
40.6 mm (1.6 in)
1910
38.1 mm (1.5 in)
1911
58.4 mm (2.3 in)
1912
42.2 mm (1.7 in)
1913
50.8 mm (2.0 in)
1914
50.8 mm (2.0 in)
1915
51.3 mm (2.0 in)
1916
76.2 mm (3.0 in)
1917
64.0 mm (2.5 in)
1918
59.9 mm (2.4 in)
1919
50.3 mm (2.0 in)
1920
40.1 mm (1.6 in)
1921
41.9 mm (1.6 in)
1922
15.0 mm (0.6 in)
1923
58.4 mm (2.3 in)
1924
51.6 mm (2.0 in)
1925
40.1 mm (1.6 in)
1926
111.8 mm (4.4 in)
1927
43.4 mm (1.7 in)
1928
44.5 mm (1.8 in)
1929
71.9 mm (2.8 in)
1930
36.8 mm (1.4 in)
1931
49.3 mm (1.9 in)
1932
62.5 mm (2.5 in)
1933
111.0 mm (4.4 in)
1934
66.5 mm (2.6 in)
1935
53.8 mm (2.1 in)
1936
49.3 mm (1.9 in)
1937
56.9 mm (2.2 in)
1938
37.6 mm (1.5 in)
1939
75.2 mm (3.0 in)
1940
48.0 mm (1.9 in)
1941
120.1 mm (4.7 in)
1942
55.4 mm (2.2 in)
1943
54.6 mm (2.1 in)
1944
42.2 mm (1.7 in)
1945
54.1 mm (2.1 in)
1946
94.5 mm (3.7 in)
1947
37.6 mm (1.5 in)
1948
45.7 mm (1.8 in)
1949
45.0 mm (1.8 in)
1950
64.5 mm (2.5 in)
1951
46.0 mm (1.8 in)
1952
54.1 mm (2.1 in)
1953
61.0 mm (2.4 in)
1954
51.8 mm (2.0 in)
1955
59.9 mm (2.4 in)
1956
42.7 mm (1.7 in)
1957
39.9 mm (1.6 in)
1958
109.2 mm (4.3 in)
1959
59.7 mm (2.4 in)
1960
69.3 mm (2.7 in)
1961
50.8 mm (2.0 in)
1962
62.0 mm (2.4 in)
1963
64.5 mm (2.5 in)
1964
51.6 mm (2.0 in)
1965
52.6 mm (2.1 in)
1966
61.2 mm (2.4 in)
1967
42.7 mm (1.7 in)
1968
48.3 mm (1.9 in)
1969
63.8 mm (2.5 in)
1970
37.6 mm (1.5 in)
1971
27.2 mm (1.1 in)
1972
36.3 mm (1.4 in)
1973
55.4 mm (2.2 in)
1974
69.3 mm (2.7 in)
1975
104.1 mm (4.1 in)
1976
32.0 mm (1.3 in)
1977
44.7 mm (1.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Lock Haven, 1890 to 1977. The record is 168.4 mm (6.6 in) in 1975, marked on the chart; the median year is 79.9 mm (3.1 in).
Wettest five days (Rx5day) at Lock Haven by year
Year
Wettest five days (Rx5day)
1890
23.4 mm (0.9 in)
1891
69.1 mm (2.7 in)
1892
87.9 mm (3.5 in)
1893
80.0 mm (3.1 in)
1894
112.1 mm (4.4 in)
1895
70.1 mm (2.8 in)
1896
98.9 mm (3.9 in)
1897
78.1 mm (3.1 in)
1898
100.6 mm (4.0 in)
1899
117.9 mm (4.6 in)
1900
92.8 mm (3.7 in)
1901
93.8 mm (3.7 in)
1902
105.1 mm (4.1 in)
1903
64.4 mm (2.5 in)
1904
71.3 mm (2.8 in)
1905
101.9 mm (4.0 in)
1906
77.0 mm (3.0 in)
1907
98.3 mm (3.9 in)
1908
55.1 mm (2.2 in)
1909
70.7 mm (2.8 in)
1910
68.9 mm (2.7 in)
1911
102.9 mm (4.1 in)
1912
67.4 mm (2.7 in)
1913
79.3 mm (3.1 in)
1914
97.8 mm (3.9 in)
1915
56.4 mm (2.2 in)
1916
105.7 mm (4.2 in)
1917
64.0 mm (2.5 in)
1918
90.2 mm (3.6 in)
1919
128.0 mm (5.0 in)
1920
67.5 mm (2.7 in)
1921
75.2 mm (3.0 in)
1922
34.6 mm (1.4 in)
1923
47.0 mm (1.9 in)
1924
51.6 mm (2.0 in)
1925
43.9 mm (1.7 in)
1926
116.4 mm (4.6 in)
1927
71.8 mm (2.8 in)
1928
84.5 mm (3.3 in)
1929
99.6 mm (3.9 in)
1930
88.1 mm (3.5 in)
1931
92.4 mm (3.6 in)
1932
106.7 mm (4.2 in)
1933
125.7 mm (4.9 in)
1934
93.6 mm (3.7 in)
1935
62.2 mm (2.4 in)
1936
61.5 mm (2.4 in)
1937
70.8 mm (2.8 in)
1938
70.6 mm (2.8 in)
1939
86.6 mm (3.4 in)
1940
77.4 mm (3.0 in)
1941
137.9 mm (5.4 in)
1942
104.4 mm (4.1 in)
1943
97.6 mm (3.8 in)
1944
82.6 mm (3.3 in)
1945
80.3 mm (3.2 in)
1946
126.2 mm (5.0 in)
1947
73.1 mm (2.9 in)
1948
56.4 mm (2.2 in)
1949
63.9 mm (2.5 in)
1950
97.2 mm (3.8 in)
1951
102.3 mm (4.0 in)
1952
103.7 mm (4.1 in)
1953
78.8 mm (3.1 in)
1954
81.8 mm (3.2 in)
1955
139.1 mm (5.5 in)
1956
64.8 mm (2.6 in)
1957
79.7 mm (3.1 in)
1958
115.8 mm (4.6 in)
1959
82.4 mm (3.2 in)
1960
99.2 mm (3.9 in)
1961
73.6 mm (2.9 in)
1962
76.0 mm (3.0 in)
1963
67.3 mm (2.6 in)
1964
87.2 mm (3.4 in)
1965
56.4 mm (2.2 in)
1966
84.9 mm (3.3 in)
1967
62.7 mm (2.5 in)
1968
73.4 mm (2.9 in)
1969
92.5 mm (3.6 in)
1970
75.7 mm (3.0 in)
1971
50.1 mm (2.0 in)
1972
68.6 mm (2.7 in)
1973
70.6 mm (2.8 in)
1974
89.7 mm (3.5 in)
1975
168.4 mm (6.6 in)
1976
71.1 mm (2.8 in)
1977
69.3 mm (2.7 in)
Longest dry spell (CDD)
The longest dry spell of the year at Lock Haven, 1890 to 1977. The record is 31 days in 1963, marked on the chart; the median year is 15 days.
Longest dry spell (CDD) at Lock Haven by year
Year
Longest dry spell (CDD)
1890
11 days
1891
10 days
1892
6 days
1893
15 days
1894
17 days
1895
14 days
1896
13 days
1897
15 days
1898
14 days
1899
16 days
1900
24 days
1901
17 days
1902
16 days
1903
17 days
1904
14 days
1905
18 days
1906
12 days
1907
13 days
1908
14 days
1909
23 days
1910
14 days
1911
13 days
1912
19 days
1913
18 days
1914
14 days
1915
13 days
1916
13 days
1917
22 days
1918
19 days
1919
19 days
1920
13 days
1921
14 days
1922
8 days
1923
10 days
1924
22 days
1925
13 days
1926
13 days
1927
14 days
1928
17 days
1929
18 days
1930
21 days
1931
14 days
1932
18 days
1933
12 days
1934
28 days
1935
19 days
1936
18 days
1937
10 days
1938
13 days
1939
17 days
1940
17 days
1941
24 days
1942
19 days
1943
24 days
1944
21 days
1945
15 days
1946
14 days
1947
26 days
1948
11 days
1949
19 days
1950
15 days
1951
12 days
1952
14 days
1953
18 days
1954
12 days
1955
15 days
1956
15 days
1957
16 days
1958
16 days
1959
15 days
1960
18 days
1961
15 days
1962
15 days
1963
31 days
1964
22 days
1965
14 days
1966
21 days
1967
19 days
1968
26 days
1969
17 days
1970
11 days
1971
11 days
1972
14 days
1973
15 days
1974
11 days
1975
14 days
1976
19 days
1977
13 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
64 years with a frost
Across 64 years with a frost, the median last spring frost at Lock Haven falls on 3 May and the median first autumn frost on 7 October, which leaves a median of 159 days between them.
In 1939 to 1974 the median growing season was 152 days. That is 13 days fewer than in 1896 to 1933.
Fitted over all years, the growing season changes by -3.4 days per decade at this station.
Frost dates and growing season at Lock Haven
Measure
Median, all years
Earliest period (1896 to 1933)
Recent period (1939 to 1974)
Recent against earliest
Fitted trend
Last spring frost
3 May
28 April
7 May
9 days later
+2.1 days per decade
First autumn frost
7 October
10 October
5 October
5 days earlier
-1.3 days per decade
Growing days
159 days
165 days
152 days
13 days fewer
-3.4 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
72 years, 1893 to 1976
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 126.7 mm (5.0 in) of rain is expected about once in 100 years.
Rainfall return levels at Lock Haven: 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
68.1 mm (2.7 in)
10 years
79.6 mm (3.1 in)
25 years
96.4 mm (3.8 in)
50 years
110.7 mm (4.4 in)
100 years
126.7 mm (5.0 in)
Longer than the 72 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, 72 years of values from 1893 to 1976.
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: 120.1 mm (4.7 in) in 1941; 111.0 mm (4.4 in) in 1933; 109.2 mm (4.3 in) in 1958.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Lock Haven, at 1941. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1941 ran 0.4 C (0.7 F) lower than in the years before (possible change).
Suspected changes in the annual mean temperature at Lock Haven, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1941
-0.4
-0.7
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 Lock Haven standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Lock Haven 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.