Record envelope, standing records and threshold days for Harrisburg - Coop (USC00363711), Pennsylvania, United States, with 55 years of record.
Key Facts for Harrisburg - Coop
Harrisburg - Coop (USC00363711) is a weather station in Pennsylvania, United States at 40.27 latitude and -76.88 longitude, n/a above sea level.
The station reports from 1888 to 1942, 55 years of record.
1,464 records set at Harrisburg - Coop still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Harrisburg - Coop tied a daily record high minimum temperature of 21.7 C (71.1 F) on 11 June 1942.
About the Station
Location: Pennsylvania, United States, 40.27 latitude, -76.88 longitude.
Elevation: n/a.
Period of record: 1888 to 1942, 55 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 Harrisburg - Coop. 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 Harrisburg - Coop, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
22.8 C (73.0 F)
-25.6 C (-14.1 F)
n/a
n/a
Feb
23.3 C (73.9 F)
-25.0 C (-13.0 F)
n/a
n/a
Mar
28.9 C (84.0 F)
-15.0 C (5.0 F)
n/a
n/a
Apr
33.9 C (93.0 F)
-11.7 C (10.9 F)
n/a
n/a
May
36.1 C (97.0 F)
1.1 C (34.0 F)
n/a
n/a
Jun
37.8 C (100.0 F)
6.1 C (43.0 F)
n/a
n/a
Jul
39.4 C (102.9 F)
10.0 C (50.0 F)
n/a
n/a
Aug
40.0 C (104.0 F)
8.9 C (48.0 F)
n/a
n/a
Sep
36.7 C (98.1 F)
2.2 C (36.0 F)
n/a
n/a
Oct
35.6 C (96.1 F)
-3.3 C (26.1 F)
n/a
n/a
Nov
24.4 C (75.9 F)
-12.2 C (10.0 F)
n/a
n/a
Dec
20.0 C (68.0 F)
-19.4 C (-2.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Harrisburg - Coop still stand. 1900 holds the most, with 50.
Standing records at Harrisburg - Coop by the year they were set
Year set
Standing records
1888
20
1889
22
1890
34
1891
36
1892
27
1893
25
1894
26
1895
46
1896
44
1897
18
1898
25
1899
21
1900
50
1901
29
1902
23
1903
29
1904
24
1905
20
1906
18
1907
19
1908
23
1909
18
1910
15
1911
27
1912
25
1913
28
1914
39
1915
19
1916
15
1917
42
1918
32
1919
21
1920
17
1921
28
1922
15
1923
30
1924
12
1925
33
1926
27
1927
29
1928
26
1929
33
1930
39
1931
25
1932
36
1933
30
1934
23
1935
28
1936
31
1937
9
1938
29
1939
21
1940
34
1941
32
1942
17
All-Time Record Progression
2 new records
2 all-time records were set at Harrisburg - Coop between 6 August 1918 and 20 February 1921. Each dot is a new record.
When Harrisburg - Coop set new all-time records
Date
Kind
Detail
1918-08-06
Record high maximum temperature
Record high maximum temperature 40.0 C (104.0 F)
1921-02-20
Record daily snowfall
Record daily snowfall 38.1 cm (15.0 in)
Wettest Day of Each Month
May: 118.4 mm (4.7 in)
The wettest day on record for each calendar month at Harrisburg - Coop. The most was 118.4 mm (4.7 in) on 31 May 1889.
Record daily precipitation for each month at Harrisburg - Coop
Month
Record daily precipitation (mm)
Date
Jan
58.2 mm (2.3 in)
12 January 1915
Feb
59.7 mm (2.4 in)
6 February 1896
Mar
54.1 mm (2.1 in)
4 March 1889
Apr
54.4 mm (2.1 in)
20 April 1940
May
118.4 mm (4.7 in)
31 May 1889
Jun
79.2 mm (3.1 in)
1 June 1889
Jul
56.4 mm (2.2 in)
24 July 1918
Aug
118.4 mm (4.7 in)
23 August 1933
Sep
105.9 mm (4.2 in)
10 September 1907
Oct
100.3 mm (3.9 in)
2 October 1929
Nov
64.3 mm (2.5 in)
13 November 1937
Dec
68.3 mm (2.7 in)
1 December 1934
Period of Record Coverage
1888 to 1942
Complete yearUnder 90 percent of days
55 years of record at Harrisburg - Coop, 1888 to 1942. 2 years have data for under 90 percent of days and are left out of rankings: 1888, 1942.
Cooler than the station meanWarmer than the station mean
One stripe for each of 53 complete years at Harrisburg - Coop, 1889 to 1941. Blue stripes are years cooler than the station's own mean of 11.4 C (52.6 F); red stripes are warmer. The coolest year was 1904, at 9.6 C (49.2 F), and the warmest was 1941, at 13.1 C (55.5 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Harrisburg - Coop as warming stripes, 1889 to 1941
Year
Annual mean temperature
Difference from the station mean
1889
11.1 C
-0.38 C
1890
11.4 C
-0.02 C
1891
11.5 C
+0.09 C
1892
10.6 C
-0.81 C
1893
10.3 C
-1.11 C
1894
11.7 C
+0.22 C
1895
10.7 C
-0.69 C
1896
11.3 C
-0.09 C
1897
11.3 C
-0.13 C
1898
12.0 C
+0.59 C
1899
11.2 C
-0.19 C
1900
12.4 C
+0.96 C
1901
11.1 C
-0.38 C
1902
11.1 C
-0.38 C
1903
11.0 C
-0.44 C
1904
9.6 C
-1.88 C
1905
10.9 C
-0.58 C
1906
11.6 C
+0.19 C
1907
10.2 C
-1.23 C
1908
11.6 C
+0.15 C
1909
11.3 C
-0.09 C
1910
11.4 C
-0.05 C
1911
11.9 C
+0.42 C
1912
11.0 C
-0.44 C
1913
12.6 C
+1.16 C
1914
11.0 C
-0.47 C
1915
11.5 C
+0.05 C
1916
11.1 C
-0.36 C
1917
10.0 C
-1.40 C
1918
11.4 C
-0.03 C
1919
11.8 C
+0.39 C
1920
10.9 C
-0.49 C
1921
12.8 C
+1.37 C
1922
12.0 C
+0.58 C
1923
11.6 C
+0.21 C
1924
10.7 C
-0.77 C
1925
11.6 C
+0.12 C
1926
10.5 C
-0.90 C
1927
11.5 C
+0.09 C
1928
11.6 C
+0.12 C
1929
11.6 C
+0.15 C
1930
12.2 C
+0.76 C
1931
13.0 C
+1.59 C
1932
12.3 C
+0.83 C
1933
12.0 C
+0.58 C
1934
11.4 C
+0.01 C
1935
11.3 C
-0.09 C
1936
11.4 C
+0.01 C
1937
11.7 C
+0.25 C
1938
12.2 C
+0.80 C
1939
12.2 C
+0.80 C
1940
10.8 C
-0.59 C
1941
13.1 C
+1.62 C
The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1889 to 1941. In Fahrenheit: 0.3 F (0.1 to 0.5) per decade. The slope is a straight line fitted to 53 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Harrisburg - Coop
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.2 C (0.1 to 0.3) per decade
0.3 F (0.1 to 0.5) per decade
1889 to 1941
53
Rise
Mean daily maximum
0.3 C (0.1 to 0.4) per decade
0.5 F (0.2 to 0.7) per decade
1889 to 1941
53
Rise
Mean daily minimum
0.09 C (-0.02 to 0.21) per decade
0.17 F (-0.03 to 0.37) per decade
1889 to 1941
53
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
1888 to 1942
Yearly extremes at Harrisburg - Coop: 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)
1918
35.6 C (96.1 F)
55
Coldest night (TNn)
-25.6 C (-14.1 F)
1912
-15.6 C (3.9 F)
55
Wettest day (Rx1day)
118.4 mm (4.7 in)
1889
50.5 mm (2.0 in)
55
Wettest five days (Rx5day)
205.2 mm (8.1 in)
1889
80.2 mm (3.2 in)
55
Longest dry spell (CDD)
47 days
1930
18 days
55
Hottest day (TXx)
The hottest day of the year at Harrisburg - Coop, 1888 to 1942. The record is 40.0 C (104.0 F) in 1918, marked on the chart; the median year is 35.6 C (96.1 F).
Hottest day (TXx) at Harrisburg - Coop by year
Year
Hottest day (TXx)
1888
35.0 C (95.0 F)
1889
33.3 C (91.9 F)
1890
35.6 C (96.1 F)
1891
33.9 C (93.0 F)
1892
36.7 C (98.1 F)
1893
35.6 C (96.1 F)
1894
35.6 C (96.1 F)
1895
36.1 C (97.0 F)
1896
35.0 C (95.0 F)
1897
35.0 C (95.0 F)
1898
38.3 C (100.9 F)
1899
35.0 C (95.0 F)
1900
37.8 C (100.0 F)
1901
37.8 C (100.0 F)
1902
35.0 C (95.0 F)
1903
34.4 C (93.9 F)
1904
34.4 C (93.9 F)
1905
35.6 C (96.1 F)
1906
34.4 C (93.9 F)
1907
32.2 C (90.0 F)
1908
36.1 C (97.0 F)
1909
35.6 C (96.1 F)
1910
33.9 C (93.0 F)
1911
37.8 C (100.0 F)
1912
33.3 C (91.9 F)
1913
36.7 C (98.1 F)
1914
34.4 C (93.9 F)
1915
33.9 C (93.0 F)
1916
36.1 C (97.0 F)
1917
37.8 C (100.0 F)
1918
40.0 C (104.0 F)
1919
38.3 C (100.9 F)
1920
33.9 C (93.0 F)
1921
35.0 C (95.0 F)
1922
35.0 C (95.0 F)
1923
36.7 C (98.1 F)
1924
36.1 C (97.0 F)
1925
37.2 C (99.0 F)
1926
38.3 C (100.9 F)
1927
34.4 C (93.9 F)
1928
34.4 C (93.9 F)
1929
35.6 C (96.1 F)
1930
39.4 C (102.9 F)
1931
37.8 C (100.0 F)
1932
36.7 C (98.1 F)
1933
36.7 C (98.1 F)
1934
37.8 C (100.0 F)
1935
35.0 C (95.0 F)
1936
39.4 C (102.9 F)
1937
35.6 C (96.1 F)
1938
35.0 C (95.0 F)
1939
36.1 C (97.0 F)
1940
38.3 C (100.9 F)
1941
38.3 C (100.9 F)
1942
36.1 C (97.0 F)
Coldest night (TNn)
The coldest night of the year at Harrisburg - Coop, 1888 to 1942. The record is -25.6 C (-14.1 F) in 1912, marked on the chart; the median year is -15.6 C (3.9 F).
Coldest night (TNn) at Harrisburg - Coop by year
Year
Coldest night (TNn)
1888
-11.7 C (10.9 F)
1889
-18.3 C (-0.9 F)
1890
-13.3 C (8.1 F)
1891
-12.2 C (10.0 F)
1892
-13.3 C (8.1 F)
1893
-20.0 C (-4.0 F)
1894
-16.1 C (3.0 F)
1895
-20.0 C (-4.0 F)
1896
-18.3 C (-0.9 F)
1897
-15.6 C (3.9 F)
1898
-14.4 C (6.1 F)
1899
-25.0 C (-13.0 F)
1900
-16.1 C (3.0 F)
1901
-13.9 C (7.0 F)
1902
-13.9 C (7.0 F)
1903
-17.2 C (1.0 F)
1904
-20.6 C (-5.1 F)
1905
-19.4 C (-2.9 F)
1906
-15.6 C (3.9 F)
1907
-16.1 C (3.0 F)
1908
-17.2 C (1.0 F)
1909
-15.0 C (5.0 F)
1910
-16.7 C (1.9 F)
1911
-11.1 C (12.0 F)
1912
-25.6 C (-14.1 F)
1913
-11.7 C (10.9 F)
1914
-18.3 C (-0.9 F)
1915
-11.7 C (10.9 F)
1916
-15.0 C (5.0 F)
1917
-19.4 C (-2.9 F)
1918
-22.2 C (-8.0 F)
1919
-16.7 C (1.9 F)
1920
-18.3 C (-0.9 F)
1921
-15.0 C (5.0 F)
1922
-15.6 C (3.9 F)
1923
-13.9 C (7.0 F)
1924
-15.6 C (3.9 F)
1925
-18.3 C (-0.9 F)
1926
-15.0 C (5.0 F)
1927
-16.7 C (1.9 F)
1928
-14.4 C (6.1 F)
1929
-15.0 C (5.0 F)
1930
-15.0 C (5.0 F)
1931
-10.0 C (14.0 F)
1932
-13.3 C (8.1 F)
1933
-16.7 C (1.9 F)
1934
-23.9 C (-11.0 F)
1935
-20.0 C (-4.0 F)
1936
-21.1 C (-6.0 F)
1937
-9.4 C (15.1 F)
1938
-13.9 C (7.0 F)
1939
-12.8 C (9.0 F)
1940
-16.1 C (3.0 F)
1941
-10.6 C (12.9 F)
1942
-17.2 C (1.0 F)
Wettest day (Rx1day)
The wettest day of the year at Harrisburg - Coop, 1888 to 1942. The record is 118.4 mm (4.7 in) in 1889, marked on the chart; the median year is 50.5 mm (2.0 in).
Wettest day (Rx1day) at Harrisburg - Coop by year
Year
Wettest day (Rx1day)
1888
105.2 mm (4.1 in)
1889
118.4 mm (4.7 in)
1890
54.9 mm (2.2 in)
1891
54.1 mm (2.1 in)
1892
40.1 mm (1.6 in)
1893
40.1 mm (1.6 in)
1894
57.9 mm (2.3 in)
1895
30.5 mm (1.2 in)
1896
59.7 mm (2.4 in)
1897
46.2 mm (1.8 in)
1898
60.2 mm (2.4 in)
1899
45.7 mm (1.8 in)
1900
38.6 mm (1.5 in)
1901
37.3 mm (1.5 in)
1902
42.2 mm (1.7 in)
1903
57.4 mm (2.3 in)
1904
38.4 mm (1.5 in)
1905
63.0 mm (2.5 in)
1906
47.0 mm (1.9 in)
1907
105.9 mm (4.2 in)
1908
44.7 mm (1.8 in)
1909
45.7 mm (1.8 in)
1910
48.5 mm (1.9 in)
1911
49.3 mm (1.9 in)
1912
46.2 mm (1.8 in)
1913
77.7 mm (3.1 in)
1914
45.7 mm (1.8 in)
1915
109.2 mm (4.3 in)
1916
92.2 mm (3.6 in)
1917
72.1 mm (2.8 in)
1918
56.4 mm (2.2 in)
1919
46.2 mm (1.8 in)
1920
62.5 mm (2.5 in)
1921
48.5 mm (1.9 in)
1922
38.4 mm (1.5 in)
1923
37.3 mm (1.5 in)
1924
75.7 mm (3.0 in)
1925
72.9 mm (2.9 in)
1926
46.5 mm (1.8 in)
1927
63.8 mm (2.5 in)
1928
52.6 mm (2.1 in)
1929
100.3 mm (3.9 in)
1930
41.4 mm (1.6 in)
1931
52.3 mm (2.1 in)
1932
63.2 mm (2.5 in)
1933
118.4 mm (4.7 in)
1934
75.9 mm (3.0 in)
1935
47.5 mm (1.9 in)
1936
50.5 mm (2.0 in)
1937
64.3 mm (2.5 in)
1938
41.7 mm (1.6 in)
1939
40.4 mm (1.6 in)
1940
54.4 mm (2.1 in)
1941
45.5 mm (1.8 in)
1942
50.5 mm (2.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Harrisburg - Coop, 1888 to 1942. The record is 205.2 mm (8.1 in) in 1889, marked on the chart; the median year is 80.2 mm (3.2 in).
Wettest five days (Rx5day) at Harrisburg - Coop by year
Year
Wettest five days (Rx5day)
1888
119.4 mm (4.7 in)
1889
205.2 mm (8.1 in)
1890
84.4 mm (3.3 in)
1891
70.8 mm (2.8 in)
1892
77.0 mm (3.0 in)
1893
85.8 mm (3.4 in)
1894
88.6 mm (3.5 in)
1895
59.0 mm (2.3 in)
1896
80.2 mm (3.2 in)
1897
76.2 mm (3.0 in)
1898
108.9 mm (4.3 in)
1899
78.3 mm (3.1 in)
1900
60.2 mm (2.4 in)
1901
79.7 mm (3.1 in)
1902
82.3 mm (3.2 in)
1903
73.6 mm (2.9 in)
1904
57.4 mm (2.3 in)
1905
83.0 mm (3.3 in)
1906
72.8 mm (2.9 in)
1907
128.8 mm (5.1 in)
1908
94.8 mm (3.7 in)
1909
47.7 mm (1.9 in)
1910
63.3 mm (2.5 in)
1911
100.0 mm (3.9 in)
1912
64.8 mm (2.6 in)
1913
99.4 mm (3.9 in)
1914
78.1 mm (3.1 in)
1915
111.5 mm (4.4 in)
1916
130.6 mm (5.1 in)
1917
72.9 mm (2.9 in)
1918
78.0 mm (3.1 in)
1919
88.8 mm (3.5 in)
1920
97.0 mm (3.8 in)
1921
50.3 mm (2.0 in)
1922
73.9 mm (2.9 in)
1923
59.9 mm (2.4 in)
1924
126.0 mm (5.0 in)
1925
105.1 mm (4.1 in)
1926
88.2 mm (3.5 in)
1927
74.6 mm (2.9 in)
1928
104.9 mm (4.1 in)
1929
124.9 mm (4.9 in)
1930
58.2 mm (2.3 in)
1931
57.2 mm (2.3 in)
1932
109.0 mm (4.3 in)
1933
168.5 mm (6.6 in)
1934
105.4 mm (4.1 in)
1935
61.0 mm (2.4 in)
1936
70.2 mm (2.8 in)
1937
105.5 mm (4.2 in)
1938
53.2 mm (2.1 in)
1939
85.1 mm (3.4 in)
1940
88.9 mm (3.5 in)
1941
57.2 mm (2.3 in)
1942
72.6 mm (2.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Harrisburg - Coop, 1888 to 1942. The record is 47 days in 1930, marked on the chart; the median year is 18 days.
Longest dry spell (CDD) at Harrisburg - Coop by year
Year
Longest dry spell (CDD)
1888
8 days
1889
13 days
1890
14 days
1891
15 days
1892
25 days
1893
16 days
1894
18 days
1895
19 days
1896
18 days
1897
17 days
1898
29 days
1899
15 days
1900
18 days
1901
28 days
1902
18 days
1903
19 days
1904
21 days
1905
21 days
1906
16 days
1907
18 days
1908
21 days
1909
19 days
1910
27 days
1911
14 days
1912
11 days
1913
22 days
1914
14 days
1915
14 days
1916
18 days
1917
20 days
1918
17 days
1919
14 days
1920
26 days
1921
10 days
1922
25 days
1923
25 days
1924
31 days
1925
15 days
1926
15 days
1927
13 days
1928
14 days
1929
16 days
1930
47 days
1931
27 days
1932
22 days
1933
12 days
1934
17 days
1935
17 days
1936
14 days
1937
15 days
1938
13 days
1939
25 days
1940
17 days
1941
22 days
1942
20 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
53 years with a frost
Across 53 years with a frost, the median last spring frost at Harrisburg - Coop falls on 10 April and the median first autumn frost on 2 November, which leaves a median of 206 days between them.
Fitted over all years, the growing season changes by +1.1 days per decade at this station.
Frost dates and growing season at Harrisburg - Coop
Measure
Median, all years
Earliest period
Recent period (1912 to 1941)
Recent against earliest
Fitted trend
Last spring frost
10 April
n/a
10 April
n/a
-0.7 days per decade
First autumn frost
2 November
n/a
4 November
n/a
+0.4 days per decade
Growing days
206 days
n/a
210 days
n/a
+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
53 years, 1889 to 1941
A day with at least 51.7 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 149.0 mm (5.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Harrisburg - Coop: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
51.7 mm (2.0 in)
5 years
68.5 mm (2.7 in)
10 years
82.6 mm (3.3 in)
25 years
104.8 mm (4.1 in)
50 years
125.0 mm (4.9 in)
100 years
149.0 mm (5.9 in)
Longer than the 53 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, 53 years of values from 1889 to 1941.
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: 118.4 mm (4.7 in) in 1889; 118.4 mm (4.7 in) in 1933; 109.2 mm (4.3 in) in 1915.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Harrisburg - Coop, at 1914. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1914 ran 0.2 C (0.3 F) lower than in the years before (possible change).
Suspected changes in the annual mean temperature at Harrisburg - Coop, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1914
-0.2
-0.3
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 Harrisburg - Coop standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Harrisburg - Coop 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.