Record envelope, standing records and threshold days for Harlem (USC00243929), Montana, United States, with 116 years of record.
Key Facts for Harlem
Harlem (USC00243929) is a weather station in Montana, United States at 48.54 latitude and -108.80 longitude, 723 m (2,371 ft) above sea level.
The station reports from 1896 to 2011, 116 years of record.
1,464 records set at Harlem still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Harlem tied a daily record high maximum temperature of 32.8 C (91.0 F) on 24 September 2011.
About the Station
Location: Montana, United States, 48.54 latitude, -108.80 longitude.
Elevation: 723 m (2,371 ft).
Period of record: 1896 to 2011, 116 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 Harlem. 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 Harlem, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
18.9 C (66.0 F)
-45.6 C (-50.1 F)
n/a
n/a
Feb
23.3 C (73.9 F)
-45.6 C (-50.1 F)
n/a
n/a
Mar
27.8 C (82.0 F)
-38.3 C (-36.9 F)
n/a
n/a
Apr
35.0 C (95.0 F)
-24.4 C (-11.9 F)
n/a
n/a
May
36.7 C (98.1 F)
-12.2 C (10.0 F)
n/a
n/a
Jun
41.7 C (107.1 F)
-3.3 C (26.1 F)
n/a
n/a
Jul
41.7 C (107.1 F)
1.7 C (35.1 F)
n/a
n/a
Aug
41.7 C (107.1 F)
-1.1 C (30.0 F)
n/a
n/a
Sep
38.9 C (102.0 F)
-10.6 C (12.9 F)
n/a
n/a
Oct
32.8 C (91.0 F)
-28.9 C (-20.0 F)
n/a
n/a
Nov
27.8 C (82.0 F)
-37.2 C (-35.0 F)
n/a
n/a
Dec
20.6 C (69.1 F)
-42.2 C (-44.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Harlem still stand. 1936 holds the most, with 69.
Standing records at Harlem by the year they were set
Year set
Standing records
1896
14
1897
7
1899
2
1900
6
1905
6
1924
17
1930
18
1931
17
1932
16
1933
22
1934
25
1935
18
1936
69
1937
13
1938
12
1939
24
1940
19
1941
14
1942
12
1943
26
1944
9
1945
11
1946
8
1947
18
1948
7
1949
22
1950
26
1951
33
1952
16
1953
12
1954
24
1955
16
1956
17
1957
13
1958
12
1959
22
1960
15
1961
18
1962
19
1963
21
1964
16
1965
19
1966
14
1967
24
1968
11
1969
25
1970
12
1971
7
1972
26
1973
11
1974
15
1975
11
1976
10
1977
18
1978
9
1979
6
1980
16
1981
15
1982
17
1983
17
1984
18
1985
36
1986
14
1987
21
1988
26
1989
15
1990
14
1991
17
1992
31
1993
12
1994
10
1995
21
1996
16
1997
14
1998
19
1999
21
2000
22
2001
22
2002
20
2003
21
2004
12
2005
13
2006
13
2007
15
2008
12
2010
2
2011
12
All-Time Record Progression
3 new records
3 all-time records were set at Harlem between 29 December 1968 and 25 September 1986. Each dot is a new record.
When Harlem set new all-time records
Date
Kind
Detail
1968-12-29
Record low maximum temperature
Record low maximum temperature -32.8 C (-27.0 F)
1978-07-03
Record daily precipitation
Record daily precipitation 95.5 mm (3.8 in)
1986-09-25
Record daily precipitation
Record daily precipitation 146.3 mm (5.8 in)
Wettest Day of Each Month
Sep: 146.3 mm (5.8 in)
The wettest day on record for each calendar month at Harlem. The most was 146.3 mm (5.8 in) on 25 September 1986.
Record daily precipitation for each month at Harlem
Month
Record daily precipitation (mm)
Date
Jan
25.4 mm (1.0 in)
3 January 2011
Feb
27.9 mm (1.1 in)
20 February 1897
Mar
39.4 mm (1.6 in)
4 March 2006
Apr
33.8 mm (1.3 in)
9 April 2005
May
47.0 mm (1.9 in)
29 May 1982
Jun
81.3 mm (3.2 in)
6 June 1995
Jul
95.5 mm (3.8 in)
3 July 1978
Aug
62.2 mm (2.4 in)
20 August 1966
Sep
146.3 mm (5.8 in)
25 September 1986
Oct
23.4 mm (0.9 in)
14 October 1962
Nov
25.4 mm (1.0 in)
18 November 1941
Dec
25.4 mm (1.0 in)
30 December 2010
Period of Record Coverage
1896 to 2011
Complete yearUnder 90 percent of days
88 years of record at Harlem, 1896 to 2011. 31 years have data for under 90 percent of days and are left out of rankings: 1896, 1897, 1899, 1900, 1905, 1933, 1948, 1951 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 59 complete years at Harlem, 1924 to 2008. Blue stripes are years cooler than the station's own mean of 6.0 C (42.8 F); red stripes are warmer. The coolest year was 1936, at 3.9 C (39.0 F), and the warmest was 1998, at 8.4 C (47.0 F). The strongest colour marks a difference of 2.4 C (4.3 F).
Annual mean temperature at Harlem as warming stripes, 1924 to 2008
Year
Annual mean temperature
Difference from the station mean
1924
5.5 C
-0.54 C
1931
7.3 C
+1.26 C
1932
5.0 C
-1.00 C
1935
4.0 C
-1.97 C
1936
3.9 C
-2.13 C
1937
4.1 C
-1.88 C
1938
6.2 C
+0.19 C
1940
5.7 C
-0.34 C
1941
6.8 C
+0.77 C
1942
5.4 C
-0.59 C
1943
5.1 C
-0.91 C
1944
5.6 C
-0.39 C
1945
5.0 C
-1.04 C
1946
6.7 C
+0.71 C
1947
6.2 C
+0.20 C
1952
5.3 C
-0.69 C
1953
7.7 C
+1.73 C
1954
6.1 C
+0.12 C
1955
3.9 C
-2.08 C
1956
5.6 C
-0.41 C
1957
5.8 C
-0.22 C
1958
6.3 C
+0.29 C
1959
5.0 C
-1.05 C
1960
5.4 C
-0.62 C
1961
6.7 C
+0.70 C
1962
5.8 C
-0.20 C
1963
6.3 C
+0.31 C
1964
5.6 C
-0.45 C
1965
4.2 C
-1.77 C
1966
5.2 C
-0.77 C
1967
5.9 C
-0.10 C
1968
5.9 C
-0.16 C
1969
4.1 C
-1.93 C
1970
5.3 C
-0.69 C
1971
6.0 C
-0.04 C
1972
5.1 C
-0.94 C
1975
4.5 C
-1.49 C
1982
4.1 C
-1.96 C
1983
6.4 C
+0.36 C
1984
6.7 C
+0.73 C
1986
7.3 C
+1.26 C
1988
8.1 C
+2.11 C
1990
7.4 C
+1.38 C
1991
7.5 C
+1.50 C
1992
7.7 C
+1.70 C
1994
6.5 C
+0.48 C
1995
5.9 C
-0.08 C
1996
4.2 C
-1.79 C
1997
7.4 C
+1.37 C
1998
8.4 C
+2.34 C
1999
8.2 C
+2.16 C
2000
6.7 C
+0.73 C
2001
7.3 C
+1.29 C
2003
6.7 C
+0.71 C
2004
6.1 C
+0.05 C
2005
6.9 C
+0.92 C
2006
7.9 C
+1.87 C
2007
7.4 C
+1.42 C
2008
5.8 C
-0.19 C
The annual mean temperature here has risen by 0.2 C (0.1 to 0.4) per decade over 1924 to 2008. In Fahrenheit: 0.4 F (0.2 to 0.6) per decade. The slope is a straight line fitted to 59 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Harlem
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.2 C (0.1 to 0.4) per decade
0.4 F (0.2 to 0.6) per decade
1924 to 2008
59
Rise
Mean daily maximum
0.3 C (0.1 to 0.4) per decade
0.5 F (0.2 to 0.7) per decade
1924 to 2008
59
Rise
Mean daily minimum
0.2 C (0.1 to 0.3) per decade
0.4 F (0.2 to 0.6) per decade
1924 to 2008
59
Rise
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
1896 to 2011
Yearly extremes at Harlem: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.7 C (107.1 F)
1933
37.8 C (100.0 F)
88
Coldest night (TNn)
-45.6 C (-50.1 F)
1936
-36.1 C (-33.0 F)
88
Wettest day (Rx1day)
146.3 mm (5.8 in)
1986
28.1 mm (1.1 in)
88
Wettest five days (Rx5day)
148.6 mm (5.9 in)
1986
45.6 mm (1.8 in)
88
Longest dry spell (CDD)
68 days
2008
40 days
88
Hottest day (TXx)
The hottest day of the year at Harlem, 1896 to 2011. The record is 41.7 C (107.1 F) in 1933, marked on the chart; the median year is 37.8 C (100.0 F).
Hottest day (TXx) at Harlem by year
Year
Hottest day (TXx)
1896
23.9 C (75.0 F)
1897
29.4 C (84.9 F)
1899
10.6 C (51.1 F)
1900
15.6 C (60.1 F)
1905
31.1 C (88.0 F)
1924
36.7 C (98.1 F)
1930
39.4 C (102.9 F)
1931
40.0 C (104.0 F)
1932
36.7 C (98.1 F)
1933
41.7 C (107.1 F)
1934
38.3 C (100.9 F)
1935
38.3 C (100.9 F)
1936
41.1 C (106.0 F)
1937
38.9 C (102.0 F)
1938
36.7 C (98.1 F)
1939
39.4 C (102.9 F)
1940
41.7 C (107.1 F)
1941
40.6 C (105.1 F)
1942
37.2 C (99.0 F)
1943
38.3 C (100.9 F)
1944
37.8 C (100.0 F)
1945
40.0 C (104.0 F)
1946
38.9 C (102.0 F)
1947
40.6 C (105.1 F)
1948
38.9 C (102.0 F)
1949
41.1 C (106.0 F)
1950
35.6 C (96.1 F)
1951
40.6 C (105.1 F)
1952
37.2 C (99.0 F)
1953
40.6 C (105.1 F)
1954
37.8 C (100.0 F)
1955
38.9 C (102.0 F)
1956
36.1 C (97.0 F)
1957
37.8 C (100.0 F)
1958
37.2 C (99.0 F)
1959
38.9 C (102.0 F)
1960
41.1 C (106.0 F)
1961
41.7 C (107.1 F)
1962
35.6 C (96.1 F)
1963
38.3 C (100.9 F)
1964
38.9 C (102.0 F)
1965
36.1 C (97.0 F)
1966
37.2 C (99.0 F)
1967
38.3 C (100.9 F)
1968
37.8 C (100.0 F)
1969
38.9 C (102.0 F)
1970
38.9 C (102.0 F)
1971
37.8 C (100.0 F)
1972
36.7 C (98.1 F)
1973
24.4 C (75.9 F)
1974
36.7 C (98.1 F)
1975
39.4 C (102.9 F)
1976
36.7 C (98.1 F)
1977
35.6 C (96.1 F)
1978
35.6 C (96.1 F)
1979
37.8 C (100.0 F)
1980
36.7 C (98.1 F)
1981
40.0 C (104.0 F)
1982
35.6 C (96.1 F)
1983
41.1 C (106.0 F)
1984
40.0 C (104.0 F)
1985
40.6 C (105.1 F)
1986
35.6 C (96.1 F)
1987
37.2 C (99.0 F)
1988
41.7 C (107.1 F)
1989
37.8 C (100.0 F)
1990
40.0 C (104.0 F)
1991
38.9 C (102.0 F)
1992
37.2 C (99.0 F)
1993
36.1 C (97.0 F)
1994
38.3 C (100.9 F)
1995
35.6 C (96.1 F)
1996
38.3 C (100.9 F)
1997
39.4 C (102.9 F)
1998
41.7 C (107.1 F)
1999
38.3 C (100.9 F)
2000
40.0 C (104.0 F)
2001
37.8 C (100.0 F)
2002
37.8 C (100.0 F)
2003
38.3 C (100.9 F)
2004
37.8 C (100.0 F)
2005
36.7 C (98.1 F)
2006
37.8 C (100.0 F)
2007
38.9 C (102.0 F)
2008
37.2 C (99.0 F)
2009
7.2 C (45.0 F)
2010
26.7 C (80.1 F)
2011
37.8 C (100.0 F)
Coldest night (TNn)
The coldest night of the year at Harlem, 1896 to 2011. The record is -45.6 C (-50.1 F) in 1936, marked on the chart; the median year is -36.1 C (-33.0 F).
Coldest night (TNn) at Harlem by year
Year
Coldest night (TNn)
1896
-26.1 C (-15.0 F)
1897
-36.7 C (-34.1 F)
1899
-33.3 C (-27.9 F)
1900
-38.3 C (-36.9 F)
1905
-7.2 C (19.0 F)
1924
-42.2 C (-44.0 F)
1930
-26.1 C (-15.0 F)
1931
-30.0 C (-22.0 F)
1932
-35.6 C (-32.1 F)
1933
-38.3 C (-36.9 F)
1934
-32.2 C (-26.0 F)
1935
-37.8 C (-36.0 F)
1936
-45.6 C (-50.1 F)
1937
-41.1 C (-42.0 F)
1938
-35.0 C (-31.0 F)
1939
-41.7 C (-43.1 F)
1940
-35.0 C (-31.0 F)
1941
-32.8 C (-27.0 F)
1942
-39.4 C (-38.9 F)
1943
-40.6 C (-41.1 F)
1944
-29.4 C (-20.9 F)
1945
-36.7 C (-34.1 F)
1946
-33.9 C (-29.0 F)
1947
-36.1 C (-33.0 F)
1948
-34.4 C (-29.9 F)
1949
-37.2 C (-35.0 F)
1950
-43.9 C (-47.0 F)
1951
-36.7 C (-34.1 F)
1952
-35.6 C (-32.1 F)
1953
-25.6 C (-14.1 F)
1954
-44.4 C (-47.9 F)
1955
-34.4 C (-29.9 F)
1956
-35.6 C (-32.1 F)
1957
-38.9 C (-38.0 F)
1958
-31.1 C (-24.0 F)
1959
-33.9 C (-29.0 F)
1960
-37.2 C (-35.0 F)
1961
-31.1 C (-24.0 F)
1962
-36.7 C (-34.1 F)
1963
-38.9 C (-38.0 F)
1964
-36.1 C (-33.0 F)
1965
-31.7 C (-25.1 F)
1966
-35.6 C (-32.1 F)
1967
-32.2 C (-26.0 F)
1968
-39.4 C (-38.9 F)
1969
-45.6 C (-50.1 F)
1970
-35.6 C (-32.1 F)
1971
-36.1 C (-33.0 F)
1972
-38.9 C (-38.0 F)
1973
-29.4 C (-20.9 F)
1974
-36.7 C (-34.1 F)
1975
-36.1 C (-33.0 F)
1976
-32.8 C (-27.0 F)
1977
-31.1 C (-24.0 F)
1978
-37.2 C (-35.0 F)
1979
-38.3 C (-36.9 F)
1980
-38.9 C (-38.0 F)
1981
-32.2 C (-26.0 F)
1982
-41.7 C (-43.1 F)
1983
-42.2 C (-44.0 F)
1984
-36.1 C (-33.0 F)
1985
-37.2 C (-35.0 F)
1986
-33.9 C (-29.0 F)
1987
-26.7 C (-16.1 F)
1988
-33.3 C (-27.9 F)
1989
-39.4 C (-38.9 F)
1990
-33.9 C (-29.0 F)
1991
-37.2 C (-35.0 F)
1992
-35.0 C (-31.0 F)
1993
-35.6 C (-32.1 F)
1994
-44.4 C (-47.9 F)
1995
-31.1 C (-24.0 F)
1996
-43.3 C (-45.9 F)
1997
-37.8 C (-36.0 F)
1998
-38.9 C (-38.0 F)
1999
-28.9 C (-20.0 F)
2000
-35.6 C (-32.1 F)
2001
-32.8 C (-27.0 F)
2002
-32.8 C (-27.0 F)
2003
-37.8 C (-36.0 F)
2004
-41.7 C (-43.1 F)
2005
-37.8 C (-36.0 F)
2006
-31.7 C (-25.1 F)
2007
-31.1 C (-24.0 F)
2008
-37.2 C (-35.0 F)
2009
-37.8 C (-36.0 F)
2010
-30.6 C (-23.1 F)
2011
-42.2 C (-44.0 F)
Wettest day (Rx1day)
The wettest day of the year at Harlem, 1896 to 2011. The record is 146.3 mm (5.8 in) in 1986, marked on the chart; the median year is 28.1 mm (1.1 in).
Wettest day (Rx1day) at Harlem by year
Year
Wettest day (Rx1day)
1896
1.0 mm (0.04 in)
1897
27.9 mm (1.1 in)
1899
5.1 mm (0.20 in)
1900
5.1 mm (0.20 in)
1905
15.2 mm (0.6 in)
1924
45.7 mm (1.8 in)
1930
29.2 mm (1.1 in)
1931
22.9 mm (0.9 in)
1932
33.8 mm (1.3 in)
1933
40.4 mm (1.6 in)
1934
26.7 mm (1.1 in)
1935
22.9 mm (0.9 in)
1936
19.8 mm (0.8 in)
1937
63.5 mm (2.5 in)
1938
69.9 mm (2.8 in)
1939
30.7 mm (1.2 in)
1940
30.5 mm (1.2 in)
1941
25.4 mm (1.0 in)
1942
64.8 mm (2.6 in)
1943
27.9 mm (1.1 in)
1944
33.0 mm (1.3 in)
1945
19.1 mm (0.8 in)
1946
21.6 mm (0.9 in)
1947
20.8 mm (0.8 in)
1948
29.2 mm (1.1 in)
1949
39.4 mm (1.6 in)
1950
22.9 mm (0.9 in)
1951
19.1 mm (0.8 in)
1952
30.5 mm (1.2 in)
1953
25.4 mm (1.0 in)
1954
24.9 mm (1.0 in)
1955
36.8 mm (1.4 in)
1956
25.7 mm (1.0 in)
1957
22.9 mm (0.9 in)
1958
21.1 mm (0.8 in)
1959
45.0 mm (1.8 in)
1960
19.1 mm (0.8 in)
1961
21.8 mm (0.9 in)
1962
27.9 mm (1.1 in)
1963
46.5 mm (1.8 in)
1964
20.8 mm (0.8 in)
1965
31.8 mm (1.3 in)
1966
62.2 mm (2.4 in)
1967
28.2 mm (1.1 in)
1968
45.0 mm (1.8 in)
1969
18.8 mm (0.7 in)
1970
22.1 mm (0.9 in)
1971
12.7 mm (0.5 in)
1972
57.7 mm (2.3 in)
1973
17.8 mm (0.7 in)
1974
37.8 mm (1.5 in)
1975
35.8 mm (1.4 in)
1976
40.4 mm (1.6 in)
1977
42.2 mm (1.7 in)
1978
95.5 mm (3.8 in)
1979
21.8 mm (0.9 in)
1980
17.8 mm (0.7 in)
1981
20.8 mm (0.8 in)
1982
47.0 mm (1.9 in)
1983
80.0 mm (3.1 in)
1984
8.6 mm (0.34 in)
1985
25.1 mm (1.0 in)
1986
146.3 mm (5.8 in)
1987
16.3 mm (0.6 in)
1988
17.0 mm (0.7 in)
1989
39.6 mm (1.6 in)
1990
63.0 mm (2.5 in)
1991
23.9 mm (0.9 in)
1992
23.4 mm (0.9 in)
1993
24.9 mm (1.0 in)
1994
33.8 mm (1.3 in)
1995
81.3 mm (3.2 in)
1996
31.2 mm (1.2 in)
1997
32.0 mm (1.3 in)
1998
68.3 mm (2.7 in)
1999
20.3 mm (0.8 in)
2000
46.7 mm (1.8 in)
2001
10.7 mm (0.4 in)
2002
30.5 mm (1.2 in)
2003
32.3 mm (1.3 in)
2004
18.5 mm (0.7 in)
2005
33.8 mm (1.3 in)
2006
39.4 mm (1.6 in)
2007
28.7 mm (1.1 in)
2008
33.0 mm (1.3 in)
2009
18.3 mm (0.7 in)
2010
25.4 mm (1.0 in)
2011
29.2 mm (1.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Harlem, 1896 to 2011. The record is 148.6 mm (5.9 in) in 1986, marked on the chart; the median year is 45.6 mm (1.8 in).
Wettest five days (Rx5day) at Harlem by year
Year
Wettest five days (Rx5day)
1896
1.0 mm (0.04 in)
1897
27.9 mm (1.1 in)
1899
7.4 mm (0.29 in)
1900
5.1 mm (0.20 in)
1905
21.9 mm (0.9 in)
1924
55.6 mm (2.2 in)
1930
36.6 mm (1.4 in)
1931
46.8 mm (1.8 in)
1932
99.7 mm (3.9 in)
1933
92.5 mm (3.6 in)
1934
51.1 mm (2.0 in)
1935
26.7 mm (1.1 in)
1936
23.4 mm (0.9 in)
1937
77.7 mm (3.1 in)
1938
94.8 mm (3.7 in)
1939
68.5 mm (2.7 in)
1940
43.8 mm (1.7 in)
1941
47.3 mm (1.9 in)
1942
79.5 mm (3.1 in)
1943
52.0 mm (2.0 in)
1944
63.0 mm (2.5 in)
1945
21.6 mm (0.9 in)
1946
43.2 mm (1.7 in)
1947
25.4 mm (1.0 in)
1948
54.6 mm (2.1 in)
1949
45.8 mm (1.8 in)
1950
38.2 mm (1.5 in)
1951
41.0 mm (1.6 in)
1952
35.1 mm (1.4 in)
1953
43.2 mm (1.7 in)
1954
52.0 mm (2.0 in)
1955
45.0 mm (1.8 in)
1956
31.5 mm (1.2 in)
1957
53.9 mm (2.1 in)
1958
25.1 mm (1.0 in)
1959
62.3 mm (2.5 in)
1960
37.7 mm (1.5 in)
1961
25.7 mm (1.0 in)
1962
38.9 mm (1.5 in)
1963
63.8 mm (2.5 in)
1964
31.8 mm (1.3 in)
1965
48.5 mm (1.9 in)
1966
63.5 mm (2.5 in)
1967
51.3 mm (2.0 in)
1968
60.7 mm (2.4 in)
1969
44.7 mm (1.8 in)
1970
43.5 mm (1.7 in)
1971
23.4 mm (0.9 in)
1972
65.3 mm (2.6 in)
1973
20.6 mm (0.8 in)
1974
63.3 mm (2.5 in)
1975
58.7 mm (2.3 in)
1976
57.4 mm (2.3 in)
1977
49.4 mm (1.9 in)
1978
104.1 mm (4.1 in)
1979
29.4 mm (1.2 in)
1980
17.8 mm (0.7 in)
1981
35.8 mm (1.4 in)
1982
87.7 mm (3.5 in)
1983
87.9 mm (3.5 in)
1984
16.2 mm (0.6 in)
1985
37.5 mm (1.5 in)
1986
148.6 mm (5.9 in)
1987
26.5 mm (1.0 in)
1988
39.6 mm (1.6 in)
1989
66.1 mm (2.6 in)
1990
75.7 mm (3.0 in)
1991
35.6 mm (1.4 in)
1992
53.6 mm (2.1 in)
1993
30.8 mm (1.2 in)
1994
34.4 mm (1.4 in)
1995
106.5 mm (4.2 in)
1996
46.2 mm (1.8 in)
1997
78.6 mm (3.1 in)
1998
91.0 mm (3.6 in)
1999
53.1 mm (2.1 in)
2000
86.1 mm (3.4 in)
2001
26.7 mm (1.1 in)
2002
54.4 mm (2.1 in)
2003
36.6 mm (1.4 in)
2004
41.1 mm (1.6 in)
2005
45.4 mm (1.8 in)
2006
50.4 mm (2.0 in)
2007
38.8 mm (1.5 in)
2008
71.7 mm (2.8 in)
2009
22.3 mm (0.9 in)
2010
32.0 mm (1.3 in)
2011
56.3 mm (2.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Harlem, 1896 to 2011. The record is 68 days in 2008, marked on the chart; the median year is 40 days.
Longest dry spell (CDD) at Harlem by year
Year
Longest dry spell (CDD)
1896
26 days
1897
13 days
1899
28 days
1900
21 days
1905
11 days
1924
42 days
1930
48 days
1931
48 days
1932
47 days
1933
51 days
1934
63 days
1935
40 days
1936
53 days
1937
41 days
1938
36 days
1939
38 days
1940
39 days
1941
39 days
1942
40 days
1943
44 days
1944
56 days
1945
38 days
1946
31 days
1947
46 days
1948
38 days
1949
49 days
1950
27 days
1951
23 days
1952
65 days
1953
60 days
1954
33 days
1955
47 days
1956
40 days
1957
29 days
1958
34 days
1959
38 days
1960
30 days
1961
29 days
1962
28 days
1963
41 days
1964
48 days
1965
54 days
1966
29 days
1967
58 days
1968
38 days
1969
44 days
1970
44 days
1971
46 days
1972
34 days
1973
59 days
1974
29 days
1975
40 days
1976
54 days
1977
32 days
1978
34 days
1979
26 days
1980
55 days
1981
35 days
1982
42 days
1983
41 days
1984
28 days
1985
44 days
1986
35 days
1987
60 days
1988
59 days
1989
29 days
1990
39 days
1991
54 days
1992
45 days
1993
29 days
1994
49 days
1995
44 days
1996
18 days
1997
40 days
1998
26 days
1999
24 days
2000
42 days
2001
45 days
2002
50 days
2003
29 days
2004
35 days
2005
65 days
2006
34 days
2007
44 days
2008
68 days
2009
28 days
2010
24 days
2011
22 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
59 years with a frost
Across 59 years with a frost, the median last spring frost at Harlem falls on 20 May and the median first autumn frost on 15 September, which leaves a median of 117 days between them.
Fitted over all years, the growing season changes by +0.6 days per decade at this station.
Frost dates and growing season at Harlem
Measure
Median, all years
Earliest period
Recent period (1966 to 2008)
Recent against earliest
Fitted trend
Last spring frost
20 May
n/a
20 May
n/a
-0.3 days per decade
First autumn frost
15 September
n/a
17 September
n/a
+0.3 days per decade
Growing days
117 days
n/a
120 days
n/a
+0.6 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, 1924 to 2008
A day with at least 29.3 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 118.9 mm (4.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Harlem: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
29.3 mm (1.2 in)
5 years
44.2 mm (1.7 in)
10 years
57.0 mm (2.2 in)
25 years
77.3 mm (3.0 in)
50 years
96.2 mm (3.8 in)
100 years
118.9 mm (4.7 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 1924 to 2008.
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: 146.3 mm (5.8 in) in 1986; 81.3 mm (3.2 in) in 1995; 80.0 mm (3.1 in) in 1983.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Harlem standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Harlem 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.