Record envelope, standing records and threshold days for Hyannis (USC00254100), Nebraska, United States, with 70 years of record.
Key Facts for Hyannis
Hyannis (USC00254100) is a weather station in Nebraska, United States at 42.00 latitude and -101.75 longitude, 1,149 m (3,770 ft) above sea level.
The station reports from 1927 to 1996, 70 years of record.
1,464 records set at Hyannis still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Hyannis tied a daily record low maximum temperature of -1.7 C (28.9 F) on 31 October 1996.
About the Station
Location: Nebraska, United States, 42.00 latitude, -101.75 longitude.
Elevation: 1,149 m (3,770 ft).
Period of record: 1927 to 1996, 70 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 Hyannis. 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 Hyannis, 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)
-36.7 C (-34.1 F)
n/a
n/a
Feb
23.9 C (75.0 F)
-35.6 C (-32.1 F)
n/a
n/a
Mar
29.4 C (84.9 F)
-30.0 C (-22.0 F)
n/a
n/a
Apr
33.9 C (93.0 F)
-22.2 C (-8.0 F)
n/a
n/a
May
35.0 C (95.0 F)
-11.1 C (12.0 F)
n/a
n/a
Jun
40.0 C (104.0 F)
-1.1 C (30.0 F)
n/a
n/a
Jul
43.3 C (109.9 F)
3.3 C (37.9 F)
n/a
n/a
Aug
40.6 C (105.1 F)
2.2 C (36.0 F)
n/a
n/a
Sep
38.9 C (102.0 F)
-11.1 C (12.0 F)
n/a
n/a
Oct
33.3 C (91.9 F)
-20.6 C (-5.1 F)
n/a
n/a
Nov
27.8 C (82.0 F)
-27.2 C (-17.0 F)
n/a
n/a
Dec
24.4 C (75.9 F)
-36.7 C (-34.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Hyannis still stand. 1936 holds the most, with 67.
Standing records at Hyannis by the year they were set
Year set
Standing records
1927
12
1928
19
1929
23
1930
28
1931
37
1932
27
1933
36
1934
30
1935
35
1936
67
1937
20
1938
25
1939
27
1940
40
1941
22
1942
23
1943
30
1944
21
1945
24
1946
26
1947
22
1948
19
1949
12
1950
33
1951
33
1952
21
1953
26
1954
26
1955
27
1956
24
1957
11
1958
19
1959
19
1960
17
1961
5
1962
9
1963
17
1964
13
1965
20
1966
23
1969
8
1970
18
1971
16
1972
18
1974
2
1975
14
1976
9
1977
15
1978
18
1979
23
1980
17
1981
16
1982
18
1983
31
1984
7
1985
28
1986
17
1987
22
1988
18
1989
40
1990
22
1991
25
1992
23
1993
15
1994
10
1995
30
1996
16
All-Time Record Progression
9 new records
9 all-time records were set at Hyannis between 1 September 1963 and 23 June 1995. Each dot is a new record.
When Hyannis set new all-time records
Date
Kind
Detail
1963-09-01
Record daily precipitation
Record daily precipitation 95.3 mm (3.8 in)
1966-07-04
Record high minimum temperature
Record high minimum temperature 25.6 C (78.1 F)
1966-07-09
Record high minimum temperature
Record high minimum temperature 26.1 C (79.0 F)
1975-03-27
Record daily snowfall
Record daily snowfall 30.5 cm (12.0 in)
1977-03-11
Record daily snowfall
Record daily snowfall 35.6 cm (14.0 in)
1978-05-28
Record daily precipitation
Record daily precipitation 106.4 mm (4.2 in)
1980-03-28
Record daily snowfall
Record daily snowfall 45.7 cm (18.0 in)
1989-02-03
Record low maximum temperature
Record low maximum temperature -26.7 C (-16.1 F)
1995-06-23
Record daily precipitation
Record daily precipitation 138.2 mm (5.4 in)
Wettest Day of Each Month
Jun: 138.2 mm (5.4 in)
The wettest day on record for each calendar month at Hyannis. The most was 138.2 mm (5.4 in) on 23 June 1995.
Record daily precipitation for each month at Hyannis
Month
Record daily precipitation (mm)
Date
Jan
33.0 mm (1.3 in)
27 January 1944
Feb
27.9 mm (1.1 in)
26 February 1944
Mar
81.3 mm (3.2 in)
28 March 1980
Apr
82.6 mm (3.3 in)
20 April 1971
May
106.4 mm (4.2 in)
28 May 1978
Jun
138.2 mm (5.4 in)
23 June 1995
Jul
71.1 mm (2.8 in)
19 July 1957
Aug
67.8 mm (2.7 in)
28 August 1952
Sep
95.3 mm (3.8 in)
1 September 1963
Oct
49.5 mm (1.9 in)
9 October 1949
Nov
44.5 mm (1.8 in)
7 November 1987
Dec
26.7 mm (1.1 in)
2 December 1933
Period of Record Coverage
1927 to 1996
Complete yearUnder 90 percent of days
67 years of record at Hyannis, 1927 to 1996. 22 years have data for under 90 percent of days and are left out of rankings: 1927, 1938, 1939, 1949, 1959, 1961, 1962, 1963 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 43 complete years at Hyannis, 1928 to 1995. Blue stripes are years cooler than the station's own mean of 8.9 C (48.0 F); red stripes are warmer. The coolest year was 1978, at 7.1 C (44.7 F), and the warmest was 1954, at 10.6 C (51.1 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Hyannis as warming stripes, 1928 to 1995
Year
Annual mean temperature
Difference from the station mean
1928
9.5 C
+0.61 C
1929
8.5 C
-0.37 C
1930
9.4 C
+0.46 C
1931
10.5 C
+1.60 C
1932
8.9 C
+0.01 C
1935
9.6 C
+0.67 C
1936
9.0 C
+0.13 C
1937
8.1 C
-0.81 C
1940
9.4 C
+0.51 C
1941
9.5 C
+0.63 C
1942
9.0 C
+0.05 C
1943
9.5 C
+0.62 C
1944
8.3 C
-0.60 C
1945
8.6 C
-0.29 C
1946
10.0 C
+1.05 C
1947
8.5 C
-0.42 C
1948
8.5 C
-0.46 C
1950
8.5 C
-0.44 C
1951
7.7 C
-1.20 C
1952
9.2 C
+0.31 C
1953
10.2 C
+1.32 C
1954
10.6 C
+1.69 C
1955
9.0 C
+0.07 C
1956
9.8 C
+0.86 C
1957
8.9 C
+0.02 C
1958
9.2 C
+0.25 C
1960
9.0 C
+0.04 C
1970
7.9 C
-1.05 C
1971
8.1 C
-0.81 C
1975
8.0 C
-0.96 C
1976
8.7 C
-0.22 C
1977
9.3 C
+0.34 C
1978
7.1 C
-1.84 C
1979
7.7 C
-1.24 C
1980
9.1 C
+0.22 C
1981
9.7 C
+0.82 C
1982
8.1 C
-0.85 C
1983
8.5 C
-0.45 C
1984
8.6 C
-0.27 C
1985
7.7 C
-1.26 C
1986
9.6 C
+0.69 C
1987
9.9 C
+1.00 C
1995
8.3 C
-0.59 C
The annual mean temperature here has fallen by 0.13 C (0.01 to 0.26) per decade over 1928 to 1995. In Fahrenheit: 0.24 F (0.02 to 0.46) per decade. The slope is a straight line fitted to 43 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Hyannis
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.13 C (-0.25 to -0.01) per decade
-0.24 F (-0.46 to -0.02) per decade
1928 to 1995
43
Fall
Mean daily maximum
-0.2 C (-0.3 to -0.1) per decade
-0.4 F (-0.6 to -0.1) per decade
1928 to 1995
43
Fall
Mean daily minimum
-0.1 C (-0.2 to 0.1) per decade
-0.1 F (-0.3 to 0.1) per decade
1928 to 1995
43
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
1927 to 1996
Yearly extremes at Hyannis: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
43.3 C (109.9 F)
1940
37.8 C (100.0 F)
67
Coldest night (TNn)
-36.7 C (-34.1 F)
1930
-28.9 C (-20.0 F)
67
Wettest day (Rx1day)
138.2 mm (5.4 in)
1995
44.5 mm (1.8 in)
67
Wettest five days (Rx5day)
158.0 mm (6.2 in)
1963
66.0 mm (2.6 in)
67
Longest dry spell (CDD)
74 days
1939
34 days
67
Hottest day (TXx)
The hottest day of the year at Hyannis, 1927 to 1996. The record is 43.3 C (109.9 F) in 1940, marked on the chart; the median year is 37.8 C (100.0 F).
Hottest day (TXx) at Hyannis by year
Year
Hottest day (TXx)
1927
30.6 C (87.1 F)
1928
36.1 C (97.0 F)
1929
36.1 C (97.0 F)
1930
38.3 C (100.9 F)
1931
39.4 C (102.9 F)
1932
37.8 C (100.0 F)
1933
39.4 C (102.9 F)
1934
41.1 C (106.0 F)
1935
38.3 C (100.9 F)
1936
41.1 C (106.0 F)
1937
40.6 C (105.1 F)
1938
40.6 C (105.1 F)
1939
40.0 C (104.0 F)
1940
43.3 C (109.9 F)
1941
37.8 C (100.0 F)
1942
37.2 C (99.0 F)
1943
37.8 C (100.0 F)
1944
37.2 C (99.0 F)
1945
36.7 C (98.1 F)
1946
38.9 C (102.0 F)
1947
37.8 C (100.0 F)
1948
37.2 C (99.0 F)
1949
36.1 C (97.0 F)
1950
37.2 C (99.0 F)
1951
37.2 C (99.0 F)
1952
41.1 C (106.0 F)
1953
40.0 C (104.0 F)
1954
42.8 C (109.0 F)
1955
37.8 C (100.0 F)
1956
37.8 C (100.0 F)
1957
38.9 C (102.0 F)
1958
35.6 C (96.1 F)
1959
37.8 C (100.0 F)
1960
39.4 C (102.9 F)
1961
39.4 C (102.9 F)
1962
39.4 C (102.9 F)
1963
38.9 C (102.0 F)
1964
28.9 C (84.0 F)
1965
38.3 C (100.9 F)
1966
39.4 C (102.9 F)
1969
37.2 C (99.0 F)
1970
38.9 C (102.0 F)
1971
38.9 C (102.0 F)
1972
35.6 C (96.1 F)
1974
23.3 C (73.9 F)
1975
36.7 C (98.1 F)
1976
38.3 C (100.9 F)
1977
37.8 C (100.0 F)
1978
36.1 C (97.0 F)
1979
37.2 C (99.0 F)
1980
38.9 C (102.0 F)
1981
38.3 C (100.9 F)
1982
37.8 C (100.0 F)
1983
37.8 C (100.0 F)
1984
36.7 C (98.1 F)
1985
39.4 C (102.9 F)
1986
38.9 C (102.0 F)
1987
39.4 C (102.9 F)
1988
39.4 C (102.9 F)
1989
40.0 C (104.0 F)
1990
40.6 C (105.1 F)
1991
37.2 C (99.0 F)
1992
34.4 C (93.9 F)
1993
36.7 C (98.1 F)
1994
36.7 C (98.1 F)
1995
38.9 C (102.0 F)
1996
37.8 C (100.0 F)
Coldest night (TNn)
The coldest night of the year at Hyannis, 1927 to 1996. The record is -36.7 C (-34.1 F) in 1930, marked on the chart; the median year is -28.9 C (-20.0 F).
Coldest night (TNn) at Hyannis by year
Year
Coldest night (TNn)
1927
-27.2 C (-17.0 F)
1928
-27.8 C (-18.0 F)
1929
-28.9 C (-20.0 F)
1930
-36.7 C (-34.1 F)
1931
-20.6 C (-5.1 F)
1932
-29.4 C (-20.9 F)
1933
-31.7 C (-25.1 F)
1934
-29.4 C (-20.9 F)
1935
-30.0 C (-22.0 F)
1936
-35.6 C (-32.1 F)
1937
-30.0 C (-22.0 F)
1938
-26.1 C (-15.0 F)
1939
-35.6 C (-32.1 F)
1940
-31.7 C (-25.1 F)
1941
-25.0 C (-13.0 F)
1942
-31.1 C (-24.0 F)
1943
-30.0 C (-22.0 F)
1944
-23.9 C (-11.0 F)
1945
-23.3 C (-9.9 F)
1946
-30.6 C (-23.1 F)
1947
-27.8 C (-18.0 F)
1948
-28.9 C (-20.0 F)
1949
-26.7 C (-16.1 F)
1950
-30.6 C (-23.1 F)
1951
-31.1 C (-24.0 F)
1952
-26.1 C (-15.0 F)
1953
-21.1 C (-6.0 F)
1954
-26.1 C (-15.0 F)
1955
-25.0 C (-13.0 F)
1956
-22.8 C (-9.0 F)
1957
-27.2 C (-17.0 F)
1958
-23.3 C (-9.9 F)
1959
-28.9 C (-20.0 F)
1960
-28.9 C (-20.0 F)
1961
-21.7 C (-7.1 F)
1962
-22.2 C (-8.0 F)
1963
-32.2 C (-26.0 F)
1964
-31.1 C (-24.0 F)
1965
-23.3 C (-9.9 F)
1966
-28.9 C (-20.0 F)
1969
-18.3 C (-0.9 F)
1970
-27.8 C (-18.0 F)
1971
-30.0 C (-22.0 F)
1972
-27.8 C (-18.0 F)
1974
-18.9 C (-2.0 F)
1975
-27.8 C (-18.0 F)
1976
-27.8 C (-18.0 F)
1977
-28.9 C (-20.0 F)
1978
-29.4 C (-20.9 F)
1979
-32.2 C (-26.0 F)
1980
-27.2 C (-17.0 F)
1981
-29.4 C (-20.9 F)
1982
-29.4 C (-20.9 F)
1983
-35.0 C (-31.0 F)
1984
-29.4 C (-20.9 F)
1985
-28.9 C (-20.0 F)
1986
-29.4 C (-20.9 F)
1987
-22.8 C (-9.0 F)
1988
-31.1 C (-24.0 F)
1989
-36.7 C (-34.1 F)
1990
-35.0 C (-31.0 F)
1991
-22.2 C (-8.0 F)
1992
-26.1 C (-15.0 F)
1993
-30.0 C (-22.0 F)
1994
-28.3 C (-18.9 F)
1995
-25.0 C (-13.0 F)
1996
-31.7 C (-25.1 F)
Wettest day (Rx1day)
The wettest day of the year at Hyannis, 1927 to 1996. The record is 138.2 mm (5.4 in) in 1995, marked on the chart; the median year is 44.5 mm (1.8 in).
Wettest day (Rx1day) at Hyannis by year
Year
Wettest day (Rx1day)
1927
10.7 mm (0.4 in)
1928
66.8 mm (2.6 in)
1929
50.3 mm (2.0 in)
1930
34.3 mm (1.4 in)
1931
33.0 mm (1.3 in)
1932
77.5 mm (3.1 in)
1933
69.9 mm (2.8 in)
1934
29.2 mm (1.1 in)
1935
49.5 mm (1.9 in)
1936
23.4 mm (0.9 in)
1937
58.4 mm (2.3 in)
1938
52.1 mm (2.1 in)
1939
44.5 mm (1.8 in)
1940
24.1 mm (0.9 in)
1941
50.8 mm (2.0 in)
1942
53.3 mm (2.1 in)
1943
27.9 mm (1.1 in)
1944
46.5 mm (1.8 in)
1945
36.8 mm (1.4 in)
1946
36.1 mm (1.4 in)
1947
48.5 mm (1.9 in)
1948
36.6 mm (1.4 in)
1949
54.6 mm (2.1 in)
1950
40.6 mm (1.6 in)
1951
56.6 mm (2.2 in)
1952
67.8 mm (2.7 in)
1953
61.0 mm (2.4 in)
1954
36.8 mm (1.4 in)
1955
80.5 mm (3.2 in)
1956
39.4 mm (1.6 in)
1957
71.1 mm (2.8 in)
1958
40.6 mm (1.6 in)
1959
27.7 mm (1.1 in)
1960
38.1 mm (1.5 in)
1961
35.6 mm (1.4 in)
1962
31.0 mm (1.2 in)
1963
95.3 mm (3.8 in)
1964
17.3 mm (0.7 in)
1965
48.3 mm (1.9 in)
1966
67.1 mm (2.6 in)
1969
57.4 mm (2.3 in)
1970
63.0 mm (2.5 in)
1971
82.6 mm (3.3 in)
1972
25.4 mm (1.0 in)
1974
3.8 mm (0.15 in)
1975
45.7 mm (1.8 in)
1976
40.9 mm (1.6 in)
1977
48.8 mm (1.9 in)
1978
106.4 mm (4.2 in)
1979
34.8 mm (1.4 in)
1980
81.3 mm (3.2 in)
1981
34.3 mm (1.4 in)
1982
67.3 mm (2.6 in)
1983
40.6 mm (1.6 in)
1984
37.6 mm (1.5 in)
1985
53.3 mm (2.1 in)
1986
42.7 mm (1.7 in)
1987
44.5 mm (1.8 in)
1988
52.8 mm (2.1 in)
1989
17.5 mm (0.7 in)
1990
30.5 mm (1.2 in)
1991
45.7 mm (1.8 in)
1992
26.7 mm (1.1 in)
1993
41.9 mm (1.6 in)
1994
40.6 mm (1.6 in)
1995
138.2 mm (5.4 in)
1996
32.3 mm (1.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Hyannis, 1927 to 1996. The record is 158.0 mm (6.2 in) in 1963, marked on the chart; the median year is 66.0 mm (2.6 in).
Wettest five days (Rx5day) at Hyannis by year
Year
Wettest five days (Rx5day)
1927
20.1 mm (0.8 in)
1928
95.3 mm (3.8 in)
1929
63.3 mm (2.5 in)
1930
66.5 mm (2.6 in)
1931
45.7 mm (1.8 in)
1932
110.6 mm (4.4 in)
1933
112.3 mm (4.4 in)
1934
41.9 mm (1.6 in)
1935
76.2 mm (3.0 in)
1936
23.4 mm (0.9 in)
1937
66.0 mm (2.6 in)
1938
77.5 mm (3.1 in)
1939
45.8 mm (1.8 in)
1940
43.2 mm (1.7 in)
1941
67.3 mm (2.6 in)
1942
85.1 mm (3.4 in)
1943
45.2 mm (1.8 in)
1944
54.6 mm (2.1 in)
1945
61.9 mm (2.4 in)
1946
61.0 mm (2.4 in)
1947
63.8 mm (2.5 in)
1948
56.7 mm (2.2 in)
1949
81.3 mm (3.2 in)
1950
90.6 mm (3.6 in)
1951
77.9 mm (3.1 in)
1952
77.5 mm (3.1 in)
1953
85.4 mm (3.4 in)
1954
58.4 mm (2.3 in)
1955
114.3 mm (4.5 in)
1956
51.3 mm (2.0 in)
1957
76.5 mm (3.0 in)
1958
63.4 mm (2.5 in)
1959
69.6 mm (2.7 in)
1960
58.4 mm (2.3 in)
1961
53.3 mm (2.1 in)
1962
71.1 mm (2.8 in)
1963
158.0 mm (6.2 in)
1964
37.6 mm (1.5 in)
1965
68.3 mm (2.7 in)
1966
84.4 mm (3.3 in)
1969
106.9 mm (4.2 in)
1970
88.4 mm (3.5 in)
1971
101.1 mm (4.0 in)
1972
58.7 mm (2.3 in)
1974
4.1 mm (0.16 in)
1975
49.0 mm (1.9 in)
1976
80.0 mm (3.1 in)
1977
81.5 mm (3.2 in)
1978
133.1 mm (5.2 in)
1979
63.0 mm (2.5 in)
1980
101.6 mm (4.0 in)
1981
61.3 mm (2.4 in)
1982
83.1 mm (3.3 in)
1983
55.4 mm (2.2 in)
1984
44.2 mm (1.7 in)
1985
67.4 mm (2.7 in)
1986
68.7 mm (2.7 in)
1987
51.6 mm (2.0 in)
1988
55.1 mm (2.2 in)
1989
40.7 mm (1.6 in)
1990
49.4 mm (1.9 in)
1991
67.8 mm (2.7 in)
1992
50.7 mm (2.0 in)
1993
58.7 mm (2.3 in)
1994
105.9 mm (4.2 in)
1995
140.0 mm (5.5 in)
1996
47.4 mm (1.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Hyannis, 1927 to 1996. The record is 74 days in 1939, marked on the chart; the median year is 34 days.
Longest dry spell (CDD) at Hyannis by year
Year
Longest dry spell (CDD)
1927
27 days
1928
27 days
1929
35 days
1930
38 days
1931
39 days
1932
34 days
1933
52 days
1934
41 days
1935
26 days
1936
46 days
1937
30 days
1938
30 days
1939
74 days
1940
33 days
1941
32 days
1942
35 days
1943
37 days
1944
23 days
1945
21 days
1946
48 days
1947
33 days
1948
22 days
1949
50 days
1950
47 days
1951
33 days
1952
33 days
1953
49 days
1954
70 days
1955
28 days
1956
38 days
1957
42 days
1958
39 days
1959
62 days
1960
65 days
1961
34 days
1962
39 days
1963
24 days
1964
41 days
1965
33 days
1966
29 days
1969
21 days
1970
35 days
1971
40 days
1972
62 days
1974
43 days
1975
36 days
1976
43 days
1977
38 days
1978
20 days
1979
46 days
1980
30 days
1981
28 days
1982
31 days
1983
32 days
1984
27 days
1985
52 days
1986
44 days
1987
35 days
1988
31 days
1989
30 days
1990
20 days
1991
32 days
1992
40 days
1993
22 days
1994
23 days
1995
21 days
1996
31 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
43 years with a frost
Across 43 years with a frost, the median last spring frost at Hyannis falls on 16 May and the median first autumn frost on 21 September, which leaves a median of 133 days between them.
Fitted over all years, the growing season changes by 0.0 days per decade at this station.
Frost dates and growing season at Hyannis
Measure
Median, all years
Earliest period
Recent period (1945 to 1995)
Recent against earliest
Fitted trend
Last spring frost
16 May
n/a
13 May
n/a
-0.4 days per decade
First autumn frost
21 September
n/a
24 September
n/a
-0.4 days per decade
Growing days
133 days
n/a
139 days
n/a
0.0 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
52 years, 1928 to 1995
A day with at least 44.8 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 130.2 mm (5.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Hyannis: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
44.8 mm (1.8 in)
5 years
62.8 mm (2.5 in)
10 years
76.4 mm (3.0 in)
25 years
95.9 mm (3.8 in)
50 years
112.2 mm (4.4 in)
100 years
130.2 mm (5.1 in)
Longer than the 52 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, 52 years of values from 1928 to 1995.
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: 138.2 mm (5.4 in) in 1995; 106.4 mm (4.2 in) in 1978; 82.6 mm (3.3 in) in 1971.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Hyannis standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Hyannis 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.