Record envelope, standing records and threshold days for Fort McPherson (CA002201600), Northwest Territories, Canada, with 86 years of record.
Key Facts for Fort McPherson
Fort McPherson (CA002201600) is a weather station in Northwest Territories, Canada at 67.43 latitude and -134.88 longitude, 31 m (102 ft) above sea level.
The station reports from 1892 to 1977, 86 years of record.
1,464 records set at Fort McPherson still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Fort McPherson set a daily record high maximum temperature of 26.1 C (79.0 F) on 12 June 1977.
Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Fort McPherson. 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 Fort McPherson, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
8.9 C (48.0 F)
-55.6 C (-68.1 F)
n/a
n/a
Feb
10.0 C (50.0 F)
-55.0 C (-67.0 F)
n/a
n/a
Mar
10.6 C (51.1 F)
-48.9 C (-56.0 F)
n/a
n/a
Apr
16.7 C (62.1 F)
-44.4 C (-47.9 F)
n/a
n/a
May
28.3 C (82.9 F)
-25.6 C (-14.1 F)
n/a
n/a
Jun
31.1 C (88.0 F)
-6.7 C (19.9 F)
n/a
n/a
Jul
32.2 C (90.0 F)
-1.1 C (30.0 F)
n/a
n/a
Aug
33.3 C (91.9 F)
-6.7 C (19.9 F)
n/a
n/a
Sep
27.2 C (81.0 F)
-15.0 C (5.0 F)
n/a
n/a
Oct
21.7 C (71.1 F)
-37.2 C (-35.0 F)
n/a
n/a
Nov
8.9 C (48.0 F)
-46.7 C (-52.1 F)
n/a
n/a
Dec
8.3 C (46.9 F)
-50.6 C (-59.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Fort McPherson still stand. 1927 holds the most, with 66.
Standing records at Fort McPherson by the year they were set
Year set
Standing records
1892
5
1893
9
1894
42
1895
20
1896
31
1897
51
1898
16
1899
24
1900
24
1907
1
1908
5
1909
4
1910
15
1911
14
1912
5
1913
6
1914
14
1915
20
1916
27
1917
17
1918
41
1919
11
1920
23
1921
25
1922
12
1923
13
1924
24
1925
15
1926
21
1927
66
1928
21
1929
3
1930
8
1931
24
1932
8
1933
22
1934
30
1935
13
1936
6
1937
9
1938
31
1939
14
1940
20
1941
11
1942
6
1943
26
1944
22
1945
4
1946
15
1947
13
1948
7
1949
24
1950
7
1951
8
1952
18
1953
13
1954
25
1955
28
1956
26
1957
37
1958
1
1959
25
1960
9
1961
13
1962
17
1963
17
1964
22
1965
33
1966
29
1967
23
1968
14
1969
34
1970
14
1971
19
1972
17
1973
11
1974
18
1975
23
1976
19
1977
6
All-Time Record Progression
2 new records
2 all-time records were set at Fort McPherson between 15 August 1957 and 10 July 1964. Each dot is a new record.
When Fort McPherson set new all-time records
Date
Kind
Detail
1957-08-15
Record high minimum temperature
Record high minimum temperature 23.9 C (75.0 F)
1964-07-10
Record daily precipitation
Record daily precipitation 66.0 mm (2.6 in)
Wettest Day of Each Month
Jul: 66.0 mm (2.6 in)
The wettest day on record for each calendar month at Fort McPherson. The most was 66.0 mm (2.6 in) on 10 July 1964.
Record daily precipitation for each month at Fort McPherson
Month
Record daily precipitation (mm)
Date
Jan
17.8 mm (0.7 in)
8 January 1943
Feb
15.2 mm (0.6 in)
25 February 1945
Mar
15.2 mm (0.6 in)
17 March 1956
Apr
22.9 mm (0.9 in)
20 April 1943
May
24.1 mm (0.9 in)
21 May 1921
Jun
37.3 mm (1.5 in)
19 June 1945
Jul
66.0 mm (2.6 in)
10 July 1964
Aug
50.8 mm (2.0 in)
12 August 1915
Sep
28.2 mm (1.1 in)
14 September 1911
Oct
35.6 mm (1.4 in)
29 October 1941
Nov
17.8 mm (0.7 in)
14 November 1915
Dec
20.3 mm (0.8 in)
31 December 1911
Period of Record Coverage
1892 to 1977
Complete yearUnder 90 percent of days
79 years of record at Fort McPherson, 1892 to 1977. 43 years have data for under 90 percent of days and are left out of rankings: 1892, 1893, 1894, 1895, 1898, 1899, 1900, 1907 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 31 complete years at Fort McPherson, 1896 to 1974. Blue stripes are years cooler than the station's own mean of -8.8 C (16.2 F); red stripes are warmer. The coolest year was 1897, at -11.2 C (11.9 F), and the warmest was 1943, at -6.3 C (20.7 F). The strongest colour marks a difference of 2.5 C (4.5 F).
Annual mean temperature at Fort McPherson as warming stripes, 1896 to 1974
Year
Annual mean temperature
Difference from the station mean
1896
-10.5 C
-1.71 C
1897
-11.2 C
-2.41 C
1915
-8.3 C
+0.46 C
1916
-7.0 C
+1.79 C
1917
-10.3 C
-1.53 C
1933
-10.5 C
-1.70 C
1940
-6.3 C
+2.45 C
1941
-8.9 C
-0.09 C
1943
-6.3 C
+2.49 C
1944
-6.9 C
+1.88 C
1945
-8.6 C
+0.13 C
1946
-8.8 C
-0.06 C
1949
-7.1 C
+1.69 C
1952
-8.0 C
+0.74 C
1953
-8.8 C
+0.01 C
1954
-8.7 C
+0.04 C
1955
-9.3 C
-0.56 C
1956
-9.1 C
-0.34 C
1959
-9.9 C
-1.11 C
1960
-9.3 C
-0.56 C
1961
-9.9 C
-1.15 C
1962
-6.6 C
+2.15 C
1963
-7.7 C
+1.10 C
1964
-10.3 C
-1.48 C
1965
-9.3 C
-0.51 C
1966
-9.5 C
-0.73 C
1967
-7.9 C
+0.85 C
1968
-8.2 C
+0.56 C
1969
-8.8 C
-0.01 C
1971
-9.2 C
-0.47 C
1974
-10.7 C
-1.88 C
The fitted trend in annual mean temperature here over 1896 to 1974 is 0.1 C (-0.2 to 0.3) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.3 to 0.6) per decade. The slope is a straight line fitted to 31 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Fort McPherson
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.1 C (-0.2 to 0.3) per decade
0.1 F (-0.3 to 0.6) per decade
1896 to 1974
31
Not clearly different from zero
Mean daily maximum
0.00 C (-0.24 to 0.25) per decade
0.00 F (-0.44 to 0.45) per decade
1896 to 1974
31
Not clearly different from zero
Mean daily minimum
0.2 C (-0.1 to 0.4) per decade
0.3 F (-0.2 to 0.8) per decade
1896 to 1974
31
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 1977
Yearly extremes at Fort McPherson: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
33.3 C (91.9 F)
1919
29.4 C (84.9 F)
79
Coldest night (TNn)
-55.6 C (-68.1 F)
1894
-47.8 C (-54.0 F)
79
Wettest day (Rx1day)
66.0 mm (2.6 in)
1964
17.8 mm (0.7 in)
73
Wettest five days (Rx5day)
80.0 mm (3.1 in)
1964
30.5 mm (1.2 in)
73
Longest dry spell (CDD)
58 days
1909
29 days
73
Hottest day (TXx)
The hottest day of the year at Fort McPherson, 1892 to 1977. The record is 33.3 C (91.9 F) in 1919, marked on the chart; the median year is 29.4 C (84.9 F).
Hottest day (TXx) at Fort McPherson by year
Year
Hottest day (TXx)
1892
5.0 C (41.0 F)
1893
31.7 C (89.1 F)
1894
28.3 C (82.9 F)
1895
29.4 C (84.9 F)
1896
29.4 C (84.9 F)
1897
28.9 C (84.0 F)
1898
28.3 C (82.9 F)
1899
26.7 C (80.1 F)
1900
29.4 C (84.9 F)
1907
7.8 C (46.0 F)
1908
24.4 C (75.9 F)
1909
13.3 C (55.9 F)
1910
30.0 C (86.0 F)
1911
29.4 C (84.9 F)
1912
25.6 C (78.1 F)
1913
20.0 C (68.0 F)
1914
26.7 C (80.1 F)
1915
32.2 C (90.0 F)
1916
28.9 C (84.0 F)
1917
28.9 C (84.0 F)
1918
26.1 C (79.0 F)
1919
33.3 C (91.9 F)
1920
27.8 C (82.0 F)
1921
28.9 C (84.0 F)
1922
25.0 C (77.0 F)
1923
29.4 C (84.9 F)
1924
31.1 C (88.0 F)
1925
31.7 C (89.1 F)
1926
26.1 C (79.0 F)
1927
26.7 C (80.1 F)
1928
31.1 C (88.0 F)
1929
26.7 C (80.1 F)
1930
31.1 C (88.0 F)
1931
26.7 C (80.1 F)
1932
15.0 C (59.0 F)
1933
28.9 C (84.0 F)
1934
29.4 C (84.9 F)
1935
-1.1 C (30.0 F)
1936
n/a
1937
26.1 C (79.0 F)
1938
29.4 C (84.9 F)
1939
28.9 C (84.0 F)
1940
29.4 C (84.9 F)
1941
28.3 C (82.9 F)
1942
30.0 C (86.0 F)
1943
30.6 C (87.1 F)
1944
29.4 C (84.9 F)
1945
28.3 C (82.9 F)
1946
32.2 C (90.0 F)
1947
32.2 C (90.0 F)
1948
2.2 C (36.0 F)
1949
30.0 C (86.0 F)
1950
31.1 C (88.0 F)
1951
22.2 C (72.0 F)
1952
30.0 C (86.0 F)
1953
31.1 C (88.0 F)
1954
31.7 C (89.1 F)
1955
29.4 C (84.9 F)
1956
30.6 C (87.1 F)
1957
31.1 C (88.0 F)
1958
28.9 C (84.0 F)
1959
29.4 C (84.9 F)
1960
30.0 C (86.0 F)
1961
29.4 C (84.9 F)
1962
30.6 C (87.1 F)
1963
31.7 C (89.1 F)
1964
30.6 C (87.1 F)
1965
28.3 C (82.9 F)
1966
30.6 C (87.1 F)
1967
32.2 C (90.0 F)
1968
31.1 C (88.0 F)
1969
30.0 C (86.0 F)
1970
11.1 C (52.0 F)
1971
29.4 C (84.9 F)
1972
31.7 C (89.1 F)
1973
25.6 C (78.1 F)
1974
28.9 C (84.0 F)
1975
22.2 C (72.0 F)
1976
27.2 C (81.0 F)
1977
26.7 C (80.1 F)
Coldest night (TNn)
The coldest night of the year at Fort McPherson, 1892 to 1977. The record is -55.6 C (-68.1 F) in 1894, marked on the chart; the median year is -47.8 C (-54.0 F).
Coldest night (TNn) at Fort McPherson by year
Year
Coldest night (TNn)
1892
-42.8 C (-45.0 F)
1893
-48.3 C (-54.9 F)
1894
-55.6 C (-68.1 F)
1895
-50.0 C (-58.0 F)
1896
-53.9 C (-65.0 F)
1897
-51.7 C (-61.1 F)
1898
-46.7 C (-52.1 F)
1899
-50.0 C (-58.0 F)
1900
-51.7 C (-61.1 F)
1907
-41.1 C (-42.0 F)
1908
-48.3 C (-54.9 F)
1909
-41.1 C (-42.0 F)
1910
-49.4 C (-56.9 F)
1911
-47.8 C (-54.0 F)
1912
-45.6 C (-50.1 F)
1913
-49.4 C (-56.9 F)
1914
-40.0 C (-40.0 F)
1915
-45.0 C (-49.0 F)
1916
-47.2 C (-53.0 F)
1917
-48.9 C (-56.0 F)
1918
-48.3 C (-54.9 F)
1919
-47.2 C (-53.0 F)
1920
-47.8 C (-54.0 F)
1921
-44.4 C (-47.9 F)
1922
-41.1 C (-42.0 F)
1923
-48.9 C (-56.0 F)
1924
-43.9 C (-47.0 F)
1925
-46.1 C (-51.0 F)
1926
-45.0 C (-49.0 F)
1927
-46.7 C (-52.1 F)
1928
-40.6 C (-41.1 F)
1929
-40.6 C (-41.1 F)
1930
-43.3 C (-45.9 F)
1931
-45.0 C (-49.0 F)
1932
-46.7 C (-52.1 F)
1933
-50.0 C (-58.0 F)
1934
-52.2 C (-62.0 F)
1935
-47.8 C (-54.0 F)
1936
-50.0 C (-58.0 F)
1937
-50.6 C (-59.1 F)
1938
-47.2 C (-53.0 F)
1939
-48.9 C (-56.0 F)
1940
-43.3 C (-45.9 F)
1941
-45.0 C (-49.0 F)
1942
-45.6 C (-50.1 F)
1943
-44.4 C (-47.9 F)
1944
-45.0 C (-49.0 F)
1945
-41.7 C (-43.1 F)
1946
-47.8 C (-54.0 F)
1947
-54.4 C (-65.9 F)
1948
-44.4 C (-47.9 F)
1949
-47.8 C (-54.0 F)
1950
-46.7 C (-52.1 F)
1951
-42.8 C (-45.0 F)
1952
-48.3 C (-54.9 F)
1953
-51.7 C (-61.1 F)
1954
-51.2 C (-60.2 F)
1955
-48.3 C (-54.9 F)
1956
-47.8 C (-54.0 F)
1957
-46.7 C (-52.1 F)
1958
n/a
1959
-52.2 C (-62.0 F)
1960
-51.2 C (-60.2 F)
1961
-47.2 C (-53.0 F)
1962
-47.8 C (-54.0 F)
1963
-46.1 C (-51.0 F)
1964
-48.3 C (-54.9 F)
1965
-51.7 C (-61.1 F)
1966
-52.2 C (-62.0 F)
1967
-48.9 C (-56.0 F)
1968
-55.0 C (-67.0 F)
1969
-50.6 C (-59.1 F)
1970
-48.9 C (-56.0 F)
1971
-53.3 C (-63.9 F)
1972
-50.0 C (-58.0 F)
1973
-46.7 C (-52.1 F)
1974
-49.4 C (-56.9 F)
1975
-53.3 C (-63.9 F)
1976
-50.0 C (-58.0 F)
1977
-44.4 C (-47.9 F)
Wettest day (Rx1day)
The wettest day of the year at Fort McPherson, 1892 to 1977. The record is 66.0 mm (2.6 in) in 1964, marked on the chart; the median year is 17.8 mm (0.7 in).
Wettest day (Rx1day) at Fort McPherson by year
Year
Wettest day (Rx1day)
1892
4.6 mm (0.18 in)
1893
32.5 mm (1.3 in)
1894
12.7 mm (0.5 in)
1895
7.6 mm (0.30 in)
1896
n/a
1897
n/a
1898
n/a
1899
n/a
1900
n/a
1907
10.2 mm (0.4 in)
1908
7.6 mm (0.30 in)
1909
8.9 mm (0.35 in)
1910
17.3 mm (0.7 in)
1911
28.2 mm (1.1 in)
1912
10.2 mm (0.4 in)
1913
n/a
1914
10.2 mm (0.4 in)
1915
50.8 mm (2.0 in)
1916
17.8 mm (0.7 in)
1917
33.0 mm (1.3 in)
1918
12.7 mm (0.5 in)
1919
17.3 mm (0.7 in)
1920
27.2 mm (1.1 in)
1921
24.1 mm (0.9 in)
1922
10.2 mm (0.4 in)
1923
20.3 mm (0.8 in)
1924
10.7 mm (0.4 in)
1925
14.0 mm (0.6 in)
1926
14.5 mm (0.6 in)
1927
n/a
1928
12.7 mm (0.5 in)
1929
25.4 mm (1.0 in)
1930
26.7 mm (1.1 in)
1931
8.4 mm (0.33 in)
1932
19.3 mm (0.8 in)
1933
10.2 mm (0.4 in)
1934
12.7 mm (0.5 in)
1935
26.7 mm (1.1 in)
1936
5.1 mm (0.20 in)
1937
26.2 mm (1.0 in)
1938
35.8 mm (1.4 in)
1939
17.8 mm (0.7 in)
1940
17.8 mm (0.7 in)
1941
35.6 mm (1.4 in)
1942
20.3 mm (0.8 in)
1943
22.9 mm (0.9 in)
1944
18.5 mm (0.7 in)
1945
37.3 mm (1.5 in)
1946
21.8 mm (0.9 in)
1947
14.0 mm (0.6 in)
1948
12.7 mm (0.5 in)
1949
24.4 mm (1.0 in)
1950
10.9 mm (0.4 in)
1951
22.9 mm (0.9 in)
1952
46.5 mm (1.8 in)
1953
18.5 mm (0.7 in)
1954
13.2 mm (0.5 in)
1955
13.5 mm (0.5 in)
1956
24.6 mm (1.0 in)
1957
17.8 mm (0.7 in)
1958
13.2 mm (0.5 in)
1959
14.0 mm (0.6 in)
1960
22.9 mm (0.9 in)
1961
31.8 mm (1.3 in)
1962
15.2 mm (0.6 in)
1963
15.2 mm (0.6 in)
1964
66.0 mm (2.6 in)
1965
20.1 mm (0.8 in)
1966
17.8 mm (0.7 in)
1967
17.8 mm (0.7 in)
1968
15.2 mm (0.6 in)
1969
15.2 mm (0.6 in)
1970
33.0 mm (1.3 in)
1971
29.7 mm (1.2 in)
1972
33.0 mm (1.3 in)
1973
18.3 mm (0.7 in)
1974
18.0 mm (0.7 in)
1975
28.7 mm (1.1 in)
1976
13.5 mm (0.5 in)
1977
10.4 mm (0.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Fort McPherson, 1892 to 1977. The record is 80.0 mm (3.1 in) in 1964, marked on the chart; the median year is 30.5 mm (1.2 in).
Wettest five days (Rx5day) at Fort McPherson by year
Year
Wettest five days (Rx5day)
1892
13.0 mm (0.5 in)
1893
50.3 mm (2.0 in)
1894
23.2 mm (0.9 in)
1895
15.9 mm (0.6 in)
1896
n/a
1897
n/a
1898
n/a
1899
n/a
1900
n/a
1907
10.2 mm (0.4 in)
1908
12.7 mm (0.5 in)
1909
9.7 mm (0.38 in)
1910
25.3 mm (1.0 in)
1911
31.0 mm (1.2 in)
1912
27.9 mm (1.1 in)
1913
n/a
1914
21.3 mm (0.8 in)
1915
67.8 mm (2.7 in)
1916
22.9 mm (0.9 in)
1917
44.4 mm (1.7 in)
1918
18.0 mm (0.7 in)
1919
19.3 mm (0.8 in)
1920
41.7 mm (1.6 in)
1921
24.1 mm (0.9 in)
1922
12.7 mm (0.5 in)
1923
29.7 mm (1.2 in)
1924
36.1 mm (1.4 in)
1925
14.3 mm (0.6 in)
1926
24.9 mm (1.0 in)
1927
n/a
1928
30.8 mm (1.2 in)
1929
30.4 mm (1.2 in)
1930
26.7 mm (1.1 in)
1931
15.0 mm (0.6 in)
1932
20.6 mm (0.8 in)
1933
12.7 mm (0.5 in)
1934
21.1 mm (0.8 in)
1935
40.2 mm (1.6 in)
1936
3.8 mm (0.15 in)
1937
32.5 mm (1.3 in)
1938
41.6 mm (1.6 in)
1939
26.8 mm (1.1 in)
1940
30.6 mm (1.2 in)
1941
62.3 mm (2.5 in)
1942
31.2 mm (1.2 in)
1943
44.5 mm (1.8 in)
1944
29.3 mm (1.2 in)
1945
46.7 mm (1.8 in)
1946
33.0 mm (1.3 in)
1947
28.0 mm (1.1 in)
1948
25.7 mm (1.0 in)
1949
42.7 mm (1.7 in)
1950
12.7 mm (0.5 in)
1951
50.8 mm (2.0 in)
1952
77.8 mm (3.1 in)
1953
32.8 mm (1.3 in)
1954
25.4 mm (1.0 in)
1955
27.9 mm (1.1 in)
1956
37.0 mm (1.5 in)
1957
35.6 mm (1.4 in)
1958
15.0 mm (0.6 in)
1959
30.5 mm (1.2 in)
1960
38.1 mm (1.5 in)
1961
38.2 mm (1.5 in)
1962
33.0 mm (1.3 in)
1963
15.2 mm (0.6 in)
1964
80.0 mm (3.1 in)
1965
38.1 mm (1.5 in)
1966
53.3 mm (2.1 in)
1967
49.6 mm (2.0 in)
1968
39.3 mm (1.5 in)
1969
38.2 mm (1.5 in)
1970
58.4 mm (2.3 in)
1971
45.7 mm (1.8 in)
1972
53.8 mm (2.1 in)
1973
24.9 mm (1.0 in)
1974
42.5 mm (1.7 in)
1975
32.0 mm (1.3 in)
1976
26.6 mm (1.0 in)
1977
16.5 mm (0.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at Fort McPherson, 1892 to 1977. The record is 58 days in 1909, marked on the chart; the median year is 29 days.
Longest dry spell (CDD) at Fort McPherson by year
Year
Longest dry spell (CDD)
1892
16 days
1893
43 days
1894
33 days
1895
22 days
1896
n/a
1897
n/a
1898
n/a
1899
n/a
1900
n/a
1907
29 days
1908
23 days
1909
58 days
1910
25 days
1911
39 days
1912
29 days
1913
n/a
1914
20 days
1915
27 days
1916
37 days
1917
37 days
1918
22 days
1919
15 days
1920
44 days
1921
31 days
1922
15 days
1923
24 days
1924
22 days
1925
26 days
1926
13 days
1927
n/a
1928
25 days
1929
21 days
1930
33 days
1931
25 days
1932
30 days
1933
28 days
1934
45 days
1935
37 days
1936
22 days
1937
17 days
1938
25 days
1939
28 days
1940
33 days
1941
36 days
1942
27 days
1943
32 days
1944
30 days
1945
37 days
1946
27 days
1947
47 days
1948
31 days
1949
20 days
1950
39 days
1951
16 days
1952
44 days
1953
45 days
1954
39 days
1955
35 days
1956
37 days
1957
29 days
1958
21 days
1959
34 days
1960
40 days
1961
31 days
1962
18 days
1963
49 days
1964
38 days
1965
43 days
1966
51 days
1967
21 days
1968
36 days
1969
34 days
1970
21 days
1971
38 days
1972
22 days
1973
21 days
1974
38 days
1975
25 days
1976
25 days
1977
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
31 years with a frost
Across 31 years with a frost, the median last spring frost at Fort McPherson falls on 6 June and the median first autumn frost on 24 August, which leaves a median of 81 days between them.
Fitted over all years, the growing season changes by +1.6 days per decade at this station.
Frost dates and growing season at Fort McPherson
Measure
Median, all years
Earliest period
Recent period (1897 to 1974)
Recent against earliest
Fitted trend
Last spring frost
6 June
n/a
6 June
n/a
-1.0 days per decade
First autumn frost
24 August
n/a
26 August
n/a
+0.6 days per decade
Growing days
81 days
n/a
81 days
n/a
+1.6 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
31 years, 1893 to 1974
A day with at least 22.0 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 76.5 mm (3.0 in) of rain is expected about once in 100 years.
Rainfall return levels at Fort McPherson: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
22.0 mm (0.9 in)
5 years
32.6 mm (1.3 in)
10 years
40.9 mm (1.6 in)
25 years
53.4 mm (2.1 in)
50 years
64.2 mm (2.5 in)
Longer than the 31 years of record
100 years
76.5 mm (3.0 in)
Longer than the 31 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, 31 years of values from 1893 to 1974.
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: 66.0 mm (2.6 in) in 1964; 50.8 mm (2.0 in) in 1915; 46.5 mm (1.8 in) in 1952.
Download the Data
Data for Fort McPherson standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Fort McPherson 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 2026-10-12 (12 October 2026). Records are computed by this site and are not official.