Record envelope, standing records and threshold days for Chatham Exp Fa (USC00201484), Michigan, United States, with 89 years of record.
Key Facts for Chatham Exp Fa
Chatham Exp Fa (USC00201484) is a weather station in Michigan, United States at 46.35 latitude and -86.93 longitude, 268 m (880 ft) above sea level.
The station reports from 1900 to 1988, 89 years of record.
1,464 records set at Chatham Exp Fa still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Chatham Exp Fa set a daily record high minimum temperature of 18.9 C (66.0 F) on 19 June 1988.
About the Station
Location: Michigan, United States, 46.35 latitude, -86.93 longitude.
Elevation: 268 m (880 ft).
Period of record: 1900 to 1988, 89 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 Chatham Exp Fa. 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 Chatham Exp Fa, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
12.8 C (55.0 F)
-36.7 C (-34.1 F)
n/a
n/a
Feb
15.0 C (59.0 F)
-39.4 C (-38.9 F)
n/a
n/a
Mar
26.7 C (80.1 F)
-36.7 C (-34.1 F)
n/a
n/a
Apr
30.6 C (87.1 F)
-21.7 C (-7.1 F)
n/a
n/a
May
35.6 C (96.1 F)
-11.1 C (12.0 F)
n/a
n/a
Jun
37.2 C (99.0 F)
-5.0 C (23.0 F)
n/a
n/a
Jul
39.4 C (102.9 F)
-1.7 C (28.9 F)
n/a
n/a
Aug
36.7 C (98.1 F)
-2.8 C (27.0 F)
n/a
n/a
Sep
36.7 C (98.1 F)
-6.1 C (21.0 F)
n/a
n/a
Oct
30.6 C (87.1 F)
-15.6 C (3.9 F)
n/a
n/a
Nov
25.6 C (78.1 F)
-23.9 C (-11.0 F)
n/a
n/a
Dec
14.4 C (57.9 F)
-34.4 C (-29.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Chatham Exp Fa still stand. 1912 holds the most, with 45.
Standing records at Chatham Exp Fa by the year they were set
Year set
Standing records
1900
18
1901
24
1902
19
1903
24
1904
25
1905
22
1906
26
1907
29
1908
23
1909
21
1910
26
1911
23
1912
45
1913
36
1914
38
1915
26
1926
23
1927
18
1928
18
1929
24
1930
22
1931
35
1932
15
1933
24
1934
29
1935
21
1936
36
1937
10
1938
11
1939
13
1940
16
1941
15
1942
13
1943
18
1944
15
1945
20
1946
18
1947
26
1948
19
1949
15
1950
15
1951
22
1952
8
1953
23
1954
9
1955
22
1956
19
1957
6
1958
7
1959
12
1960
8
1961
11
1962
13
1963
26
1964
29
1965
17
1966
14
1967
12
1968
21
1969
10
1970
7
1971
14
1972
19
1973
13
1974
7
1975
18
1976
15
1977
12
1978
7
1979
14
1980
13
1981
13
1982
13
1983
26
1984
16
1985
15
1986
22
1987
11
1988
6
All-Time Record Progression
1 new records
1 all-time records were set at Chatham Exp Fa between 23 January 1963 and 23 January 1963. Each dot is a new record.
When Chatham Exp Fa set new all-time records
Date
Kind
Detail
1963-01-23
Record low maximum temperature
Record low maximum temperature -22.2 C (-8.0 F)
Wettest Day of Each Month
May: 203.2 mm (8.0 in)
The wettest day on record for each calendar month at Chatham Exp Fa. The most was 203.2 mm (8.0 in) on 1 May 1901.
Record daily precipitation for each month at Chatham Exp Fa
Month
Record daily precipitation (mm)
Date
Jan
76.2 mm (3.0 in)
6 January 1901
Feb
76.2 mm (3.0 in)
4 February 1901
Mar
63.5 mm (2.5 in)
1 March 1904
Apr
95.3 mm (3.8 in)
29 April 1901
May
203.2 mm (8.0 in)
1 May 1901
Jun
89.4 mm (3.5 in)
11 June 1939
Jul
108.0 mm (4.3 in)
20 July 1978
Aug
106.4 mm (4.2 in)
3 August 1964
Sep
114.3 mm (4.5 in)
13 September 1932
Oct
78.7 mm (3.1 in)
25 October 1967
Nov
101.6 mm (4.0 in)
23 November 1903
Dec
76.2 mm (3.0 in)
7 December 1902
Period of Record Coverage
1900 to 1988
Complete yearUnder 90 percent of days
79 years of record at Chatham Exp Fa, 1900 to 1988. 2 years have data for under 90 percent of days and are left out of rankings: 1900, 1988.
Cooler than the station meanWarmer than the station mean
One stripe for each of 74 complete years at Chatham Exp Fa, 1901 to 1987. Blue stripes are years cooler than the station's own mean of 4.9 C (40.8 F); red stripes are warmer. The coolest year was 1912, at 2.3 C (36.2 F), and the warmest was 1931, at 7.2 C (44.9 F). The strongest colour marks a difference of 2.6 C (4.7 F).
Annual mean temperature at Chatham Exp Fa as warming stripes, 1901 to 1987
Year
Annual mean temperature
Difference from the station mean
1901
4.7 C
-0.17 C
1902
4.6 C
-0.34 C
1903
4.4 C
-0.56 C
1904
2.5 C
-2.39 C
1905
3.6 C
-1.31 C
1906
4.3 C
-0.66 C
1907
2.8 C
-2.16 C
1908
4.9 C
-0.01 C
1909
3.9 C
-0.99 C
1910
4.4 C
-0.56 C
1911
4.4 C
-0.56 C
1912
2.3 C
-2.59 C
1913
3.7 C
-1.19 C
1914
3.3 C
-1.65 C
1915
4.3 C
-0.59 C
1926
3.4 C
-1.52 C
1927
4.6 C
-0.32 C
1928
4.6 C
-0.30 C
1929
3.7 C
-1.25 C
1931
7.2 C
+2.27 C
1932
5.0 C
+0.11 C
1933
4.6 C
-0.35 C
1935
4.4 C
-0.53 C
1936
4.2 C
-0.70 C
1937
5.0 C
+0.04 C
1938
5.7 C
+0.80 C
1939
5.0 C
+0.07 C
1940
4.8 C
-0.08 C
1941
6.6 C
+1.71 C
1942
5.7 C
+0.80 C
1943
4.4 C
-0.47 C
1944
5.5 C
+0.54 C
1945
4.4 C
-0.49 C
1946
5.5 C
+0.54 C
1947
4.9 C
-0.06 C
1948
4.7 C
-0.22 C
1949
6.1 C
+1.15 C
1950
3.6 C
-1.30 C
1951
4.6 C
-0.31 C
1952
6.2 C
+1.32 C
1953
6.6 C
+1.66 C
1954
5.4 C
+0.48 C
1955
6.2 C
+1.27 C
1956
5.1 C
+0.18 C
1957
5.1 C
+0.19 C
1958
5.1 C
+0.23 C
1959
4.9 C
0.00 C
1960
5.0 C
+0.13 C
1961
5.5 C
+0.63 C
1962
4.8 C
-0.11 C
1963
4.9 C
-0.01 C
1964
5.9 C
+0.99 C
1965
4.7 C
-0.19 C
1966
5.5 C
+0.63 C
1967
4.8 C
-0.14 C
1968
5.6 C
+0.68 C
1969
5.7 C
+0.74 C
1970
5.3 C
+0.42 C
1971
5.2 C
+0.25 C
1972
3.6 C
-1.30 C
1973
6.5 C
+1.57 C
1974
5.0 C
+0.07 C
1975
5.8 C
+0.92 C
1977
5.8 C
+0.88 C
1978
4.7 C
-0.25 C
1979
4.2 C
-0.75 C
1980
5.1 C
+0.23 C
1981
5.4 C
+0.45 C
1982
4.6 C
-0.31 C
1983
5.6 C
+0.67 C
1984
5.4 C
+0.50 C
1985
5.7 C
+0.74 C
1986
6.2 C
+1.28 C
1987
6.8 C
+1.85 C
The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1901 to 1987. In Fahrenheit: 0.4 F (0.2 to 0.5) per decade. The slope is a straight line fitted to 74 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Chatham Exp Fa
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.2 C (0.1 to 0.3) per decade
0.4 F (0.2 to 0.5) per decade
1901 to 1987
74
Rise
Mean daily maximum
0.1 C (0.1 to 0.2) per decade
0.3 F (0.1 to 0.4) per decade
1901 to 1987
74
Rise
Mean daily minimum
0.3 C (0.2 to 0.4) per decade
0.5 F (0.3 to 0.6) per decade
1901 to 1987
74
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
1900 to 1988
Yearly extremes at Chatham Exp Fa: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
39.4 C (102.9 F)
1936
33.9 C (93.0 F)
79
Coldest night (TNn)
-39.4 C (-38.9 F)
1934
-30.6 C (-23.1 F)
79
Wettest day (Rx1day)
203.2 mm (8.0 in)
1901
50.5 mm (2.0 in)
79
Wettest five days (Rx5day)
241.3 mm (9.5 in)
1903
75.4 mm (3.0 in)
78
Longest dry spell (CDD)
27 days
1981
15 days
79
Hottest day (TXx)
The hottest day of the year at Chatham Exp Fa, 1900 to 1988. The record is 39.4 C (102.9 F) in 1936, marked on the chart; the median year is 33.9 C (93.0 F).
Hottest day (TXx) at Chatham Exp Fa by year
Year
Hottest day (TXx)
1900
35.6 C (96.1 F)
1901
36.7 C (98.1 F)
1902
31.1 C (88.0 F)
1903
33.3 C (91.9 F)
1904
32.2 C (90.0 F)
1905
32.2 C (90.0 F)
1906
32.8 C (91.0 F)
1907
32.2 C (90.0 F)
1908
32.2 C (90.0 F)
1909
32.8 C (91.0 F)
1910
35.0 C (95.0 F)
1911
38.3 C (100.9 F)
1912
33.9 C (93.0 F)
1913
33.9 C (93.0 F)
1914
33.9 C (93.0 F)
1915
30.6 C (87.1 F)
1926
32.8 C (91.0 F)
1927
34.4 C (93.9 F)
1928
33.3 C (91.9 F)
1929
34.4 C (93.9 F)
1930
34.4 C (93.9 F)
1931
37.8 C (100.0 F)
1932
32.2 C (90.0 F)
1933
36.7 C (98.1 F)
1934
32.8 C (91.0 F)
1935
33.3 C (91.9 F)
1936
39.4 C (102.9 F)
1937
36.1 C (97.0 F)
1938
33.3 C (91.9 F)
1939
35.0 C (95.0 F)
1940
34.4 C (93.9 F)
1941
34.4 C (93.9 F)
1942
35.0 C (95.0 F)
1943
33.9 C (93.0 F)
1944
32.8 C (91.0 F)
1945
33.9 C (93.0 F)
1946
30.6 C (87.1 F)
1947
35.6 C (96.1 F)
1948
35.0 C (95.0 F)
1949
33.3 C (91.9 F)
1950
31.1 C (88.0 F)
1951
31.1 C (88.0 F)
1952
32.2 C (90.0 F)
1953
36.7 C (98.1 F)
1954
33.3 C (91.9 F)
1955
37.2 C (99.0 F)
1956
35.0 C (95.0 F)
1957
32.8 C (91.0 F)
1958
33.9 C (93.0 F)
1959
32.2 C (90.0 F)
1960
31.7 C (89.1 F)
1961
33.9 C (93.0 F)
1962
31.7 C (89.1 F)
1963
35.0 C (95.0 F)
1964
33.9 C (93.0 F)
1965
35.0 C (95.0 F)
1966
35.6 C (96.1 F)
1967
31.7 C (89.1 F)
1968
33.3 C (91.9 F)
1969
35.6 C (96.1 F)
1970
34.4 C (93.9 F)
1971
33.9 C (93.0 F)
1972
31.7 C (89.1 F)
1973
34.4 C (93.9 F)
1974
32.8 C (91.0 F)
1975
36.1 C (97.0 F)
1976
35.0 C (95.0 F)
1977
33.9 C (93.0 F)
1978
30.6 C (87.1 F)
1979
31.7 C (89.1 F)
1980
32.2 C (90.0 F)
1981
32.2 C (90.0 F)
1982
29.4 C (84.9 F)
1983
35.0 C (95.0 F)
1984
29.4 C (84.9 F)
1985
30.0 C (86.0 F)
1986
33.9 C (93.0 F)
1987
32.2 C (90.0 F)
1988
34.4 C (93.9 F)
Coldest night (TNn)
The coldest night of the year at Chatham Exp Fa, 1900 to 1988. The record is -39.4 C (-38.9 F) in 1934, marked on the chart; the median year is -30.6 C (-23.1 F).
Coldest night (TNn) at Chatham Exp Fa by year
Year
Coldest night (TNn)
1900
-18.9 C (-2.0 F)
1901
-28.9 C (-20.0 F)
1902
-28.3 C (-18.9 F)
1903
-28.9 C (-20.0 F)
1904
-35.0 C (-31.0 F)
1905
-29.4 C (-20.9 F)
1906
-32.2 C (-26.0 F)
1907
-35.6 C (-32.1 F)
1908
-36.1 C (-33.0 F)
1909
-28.3 C (-18.9 F)
1910
-32.2 C (-26.0 F)
1911
-33.3 C (-27.9 F)
1912
-37.8 C (-36.0 F)
1913
-29.4 C (-20.9 F)
1914
-31.7 C (-25.1 F)
1915
-34.4 C (-29.9 F)
1926
-31.1 C (-24.0 F)
1927
-30.0 C (-22.0 F)
1928
-36.1 C (-33.0 F)
1929
-36.1 C (-33.0 F)
1930
-35.6 C (-32.1 F)
1931
-22.8 C (-9.0 F)
1932
-25.6 C (-14.1 F)
1933
-33.9 C (-29.0 F)
1934
-39.4 C (-38.9 F)
1935
-28.3 C (-18.9 F)
1936
-32.2 C (-26.0 F)
1937
-29.4 C (-20.9 F)
1938
-33.3 C (-27.9 F)
1939
-27.2 C (-17.0 F)
1940
-29.4 C (-20.9 F)
1941
-23.9 C (-11.0 F)
1942
-26.7 C (-16.1 F)
1943
-36.7 C (-34.1 F)
1944
-28.9 C (-20.0 F)
1945
-28.9 C (-20.0 F)
1946
-27.2 C (-17.0 F)
1947
-31.1 C (-24.0 F)
1948
-36.1 C (-33.0 F)
1949
-23.3 C (-9.9 F)
1950
-27.8 C (-18.0 F)
1951
-32.8 C (-27.0 F)
1952
-25.6 C (-14.1 F)
1953
-27.8 C (-18.0 F)
1954
-26.7 C (-16.1 F)
1955
-23.9 C (-11.0 F)
1956
-26.7 C (-16.1 F)
1957
-30.0 C (-22.0 F)
1958
-24.4 C (-11.9 F)
1959
-31.1 C (-24.0 F)
1960
-29.4 C (-20.9 F)
1961
-31.1 C (-24.0 F)
1962
-30.6 C (-23.1 F)
1963
-33.3 C (-27.9 F)
1964
-27.2 C (-17.0 F)
1965
-31.7 C (-25.1 F)
1966
-26.1 C (-15.0 F)
1967
-31.1 C (-24.0 F)
1968
-33.3 C (-27.9 F)
1969
-25.6 C (-14.1 F)
1970
-32.2 C (-26.0 F)
1971
-30.6 C (-23.1 F)
1972
-32.2 C (-26.0 F)
1973
-28.3 C (-18.9 F)
1974
-32.2 C (-26.0 F)
1975
-25.0 C (-13.0 F)
1976
-34.4 C (-29.9 F)
1977
-31.7 C (-25.1 F)
1978
-28.9 C (-20.0 F)
1979
-37.8 C (-36.0 F)
1980
-29.4 C (-20.9 F)
1981
-30.6 C (-23.1 F)
1982
-31.1 C (-24.0 F)
1983
-32.8 C (-27.0 F)
1984
-33.9 C (-29.0 F)
1985
-33.3 C (-27.9 F)
1986
-23.3 C (-9.9 F)
1987
-24.4 C (-11.9 F)
1988
-24.4 C (-11.9 F)
Wettest day (Rx1day)
The wettest day of the year at Chatham Exp Fa, 1900 to 1988. The record is 203.2 mm (8.0 in) in 1901, marked on the chart; the median year is 50.5 mm (2.0 in).
Wettest day (Rx1day) at Chatham Exp Fa by year
Year
Wettest day (Rx1day)
1900
58.4 mm (2.3 in)
1901
203.2 mm (8.0 in)
1902
76.2 mm (3.0 in)
1903
101.6 mm (4.0 in)
1904
76.2 mm (3.0 in)
1905
63.5 mm (2.5 in)
1906
30.5 mm (1.2 in)
1907
51.8 mm (2.0 in)
1908
36.1 mm (1.4 in)
1909
75.2 mm (3.0 in)
1910
29.5 mm (1.2 in)
1911
72.1 mm (2.8 in)
1912
50.8 mm (2.0 in)
1913
43.2 mm (1.7 in)
1914
63.5 mm (2.5 in)
1915
47.0 mm (1.9 in)
1926
56.4 mm (2.2 in)
1927
66.0 mm (2.6 in)
1928
44.5 mm (1.8 in)
1929
72.4 mm (2.9 in)
1930
34.3 mm (1.4 in)
1931
33.5 mm (1.3 in)
1932
114.3 mm (4.5 in)
1933
41.1 mm (1.6 in)
1934
53.3 mm (2.1 in)
1935
45.5 mm (1.8 in)
1936
38.1 mm (1.5 in)
1937
66.0 mm (2.6 in)
1938
44.5 mm (1.8 in)
1939
89.4 mm (3.5 in)
1940
41.1 mm (1.6 in)
1941
61.5 mm (2.4 in)
1942
57.2 mm (2.3 in)
1943
64.3 mm (2.5 in)
1944
33.0 mm (1.3 in)
1945
42.2 mm (1.7 in)
1946
36.1 mm (1.4 in)
1947
45.2 mm (1.8 in)
1948
40.1 mm (1.6 in)
1949
50.8 mm (2.0 in)
1950
27.7 mm (1.1 in)
1951
48.0 mm (1.9 in)
1952
39.4 mm (1.6 in)
1953
38.6 mm (1.5 in)
1954
36.6 mm (1.4 in)
1955
28.7 mm (1.1 in)
1956
38.4 mm (1.5 in)
1957
75.9 mm (3.0 in)
1958
37.3 mm (1.5 in)
1959
78.5 mm (3.1 in)
1960
62.0 mm (2.4 in)
1961
47.0 mm (1.9 in)
1962
22.6 mm (0.9 in)
1963
32.5 mm (1.3 in)
1964
106.4 mm (4.2 in)
1965
37.6 mm (1.5 in)
1966
57.2 mm (2.3 in)
1967
78.7 mm (3.1 in)
1968
47.0 mm (1.9 in)
1969
32.3 mm (1.3 in)
1970
50.5 mm (2.0 in)
1971
42.4 mm (1.7 in)
1972
56.6 mm (2.2 in)
1973
51.3 mm (2.0 in)
1974
73.7 mm (2.9 in)
1975
34.8 mm (1.4 in)
1976
51.1 mm (2.0 in)
1977
44.5 mm (1.8 in)
1978
108.0 mm (4.3 in)
1979
50.8 mm (2.0 in)
1980
32.3 mm (1.3 in)
1981
42.2 mm (1.7 in)
1982
69.9 mm (2.8 in)
1983
61.2 mm (2.4 in)
1984
54.1 mm (2.1 in)
1985
63.2 mm (2.5 in)
1986
40.6 mm (1.6 in)
1987
73.7 mm (2.9 in)
1988
10.4 mm (0.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Chatham Exp Fa, 1900 to 1988. The record is 241.3 mm (9.5 in) in 1903, marked on the chart; the median year is 75.4 mm (3.0 in).
Wettest five days (Rx5day) at Chatham Exp Fa by year
Year
Wettest five days (Rx5day)
1900
74.0 mm (2.9 in)
1901
53.4 mm (2.1 in)
1902
152.4 mm (6.0 in)
1903
241.3 mm (9.5 in)
1904
190.5 mm (7.5 in)
1905
213.3 mm (8.4 in)
1906
46.0 mm (1.8 in)
1907
69.6 mm (2.7 in)
1908
33.5 mm (1.3 in)
1909
35.0 mm (1.4 in)
1910
45.8 mm (1.8 in)
1911
65.1 mm (2.6 in)
1912
21.6 mm (0.9 in)
1913
63.4 mm (2.5 in)
1914
n/a
1915
80.2 mm (3.2 in)
1926
74.9 mm (2.9 in)
1927
78.5 mm (3.1 in)
1928
88.9 mm (3.5 in)
1929
87.1 mm (3.4 in)
1930
50.8 mm (2.0 in)
1931
65.7 mm (2.6 in)
1932
122.4 mm (4.8 in)
1933
55.6 mm (2.2 in)
1934
81.1 mm (3.2 in)
1935
58.5 mm (2.3 in)
1936
58.7 mm (2.3 in)
1937
90.3 mm (3.6 in)
1938
83.2 mm (3.3 in)
1939
127.0 mm (5.0 in)
1940
75.8 mm (3.0 in)
1941
85.4 mm (3.4 in)
1942
74.3 mm (2.9 in)
1943
136.2 mm (5.4 in)
1944
81.5 mm (3.2 in)
1945
49.6 mm (2.0 in)
1946
55.7 mm (2.2 in)
1947
73.4 mm (2.9 in)
1948
66.3 mm (2.6 in)
1949
79.3 mm (3.1 in)
1950
57.2 mm (2.3 in)
1951
58.9 mm (2.3 in)
1952
77.8 mm (3.1 in)
1953
73.6 mm (2.9 in)
1954
65.8 mm (2.6 in)
1955
55.1 mm (2.2 in)
1956
47.7 mm (1.9 in)
1957
96.1 mm (3.8 in)
1958
64.5 mm (2.5 in)
1959
129.1 mm (5.1 in)
1960
166.2 mm (6.5 in)
1961
67.1 mm (2.6 in)
1962
39.6 mm (1.6 in)
1963
46.0 mm (1.8 in)
1964
116.3 mm (4.6 in)
1965
79.5 mm (3.1 in)
1966
71.4 mm (2.8 in)
1967
86.0 mm (3.4 in)
1968
98.0 mm (3.9 in)
1969
55.9 mm (2.2 in)
1970
89.9 mm (3.5 in)
1971
52.6 mm (2.1 in)
1972
77.1 mm (3.0 in)
1973
82.3 mm (3.2 in)
1974
83.4 mm (3.3 in)
1975
64.9 mm (2.6 in)
1976
51.6 mm (2.0 in)
1977
87.6 mm (3.4 in)
1978
134.5 mm (5.3 in)
1979
86.8 mm (3.4 in)
1980
62.3 mm (2.5 in)
1981
84.3 mm (3.3 in)
1982
85.3 mm (3.4 in)
1983
101.3 mm (4.0 in)
1984
97.1 mm (3.8 in)
1985
85.9 mm (3.4 in)
1986
54.6 mm (2.1 in)
1987
124.0 mm (4.9 in)
1988
13.7 mm (0.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Chatham Exp Fa, 1900 to 1988. The record is 27 days in 1981, marked on the chart; the median year is 15 days.
Longest dry spell (CDD) at Chatham Exp Fa by year
Year
Longest dry spell (CDD)
1900
9 days
1901
3 days
1902
3 days
1903
3 days
1904
4 days
1905
4 days
1906
2 days
1907
3 days
1908
2 days
1909
3 days
1910
5 days
1911
2 days
1912
1 day
1913
2 days
1914
2 days
1915
1 day
1926
21 days
1927
17 days
1928
23 days
1929
14 days
1930
12 days
1931
21 days
1932
20 days
1933
16 days
1934
14 days
1935
14 days
1936
23 days
1937
17 days
1938
16 days
1939
20 days
1940
12 days
1941
25 days
1942
23 days
1943
20 days
1944
18 days
1945
14 days
1946
17 days
1947
15 days
1948
19 days
1949
25 days
1950
12 days
1951
12 days
1952
14 days
1953
17 days
1954
26 days
1955
15 days
1956
16 days
1957
19 days
1958
17 days
1959
14 days
1960
12 days
1961
15 days
1962
13 days
1963
23 days
1964
13 days
1965
15 days
1966
12 days
1967
19 days
1968
14 days
1969
20 days
1970
16 days
1971
11 days
1972
14 days
1973
16 days
1974
11 days
1975
18 days
1976
15 days
1977
26 days
1978
17 days
1979
20 days
1980
17 days
1981
27 days
1982
21 days
1983
12 days
1984
20 days
1985
13 days
1986
20 days
1987
23 days
1988
14 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
74 years with a frost
Across 74 years with a frost, the median last spring frost at Chatham Exp Fa falls on 10 June and the median first autumn frost on 12 September, which leaves a median of 96 days between them.
In 1957 to 1987 the median growing season was 95 days. That is 9 days more than in 1901 to 1942.
Fitted over all years, the growing season changes by +4.2 days per decade at this station.
Frost dates and growing season at Chatham Exp Fa
Measure
Median, all years
Earliest period (1901 to 1942)
Recent period (1957 to 1987)
Recent against earliest
Fitted trend
Last spring frost
10 June
13 June
11 June
2 days earlier
-1.1 days per decade
First autumn frost
12 September
4 September
12 September
8 days later
+3.1 days per decade
Growing days
96 days
86 days
95 days
9 days more
+4.2 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
62 years, 1926 to 1987
A day with at least 47.8 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 125.0 mm (4.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Chatham Exp Fa: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
47.8 mm (1.9 in)
5 years
64.7 mm (2.5 in)
10 years
77.3 mm (3.0 in)
25 years
94.9 mm (3.7 in)
50 years
109.3 mm (4.3 in)
100 years
125.0 mm (4.9 in)
Longer than the 62 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, 62 years of values from 1926 to 1987.
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: 114.3 mm (4.5 in) in 1932; 108.0 mm (4.3 in) in 1978; 106.4 mm (4.2 in) in 1964.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Chatham Exp Fa standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Chatham Exp Fa 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.