Record envelope, standing records and threshold days for Merrill (USC00225789), Mississippi, United States, with 94 years of record.
Key Facts for Merrill
Merrill (USC00225789) is a weather station in Mississippi, United States at 30.98 latitude and -88.72 longitude, 15 m (50 ft) above sea level.
The station reports from 1905 to 1998, 94 years of record.
1,464 records set at Merrill still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Merrill set a daily record precipitation of 52.1 mm (2.1 in) on 27 January 1998.
About the Station
Location: Mississippi, United States, 30.98 latitude, -88.72 longitude.
Elevation: 15 m (50 ft).
Period of record: 1905 to 1998, 94 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 Merrill. 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 Merrill, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
28.9 C (84.0 F)
-20.6 C (-5.1 F)
n/a
n/a
Feb
30.6 C (87.1 F)
-12.2 C (10.0 F)
n/a
n/a
Mar
32.8 C (91.0 F)
-8.3 C (17.1 F)
n/a
n/a
Apr
35.0 C (95.0 F)
-3.9 C (25.0 F)
n/a
n/a
May
37.2 C (99.0 F)
2.2 C (36.0 F)
n/a
n/a
Jun
42.2 C (108.0 F)
5.6 C (42.1 F)
n/a
n/a
Jul
40.0 C (104.0 F)
9.4 C (48.9 F)
n/a
n/a
Aug
38.9 C (102.0 F)
11.1 C (52.0 F)
n/a
n/a
Sep
38.9 C (102.0 F)
3.9 C (39.0 F)
n/a
n/a
Oct
36.7 C (98.1 F)
-6.7 C (19.9 F)
n/a
n/a
Nov
32.2 C (90.0 F)
-8.3 C (17.1 F)
n/a
n/a
Dec
30.0 C (86.0 F)
-14.4 C (6.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Merrill still stand. 1955 holds the most, with 70.
Standing records at Merrill by the year they were set
Year set
Standing records
1954
51
1955
70
1956
40
1957
55
1958
42
1959
39
1960
33
1961
35
1962
43
1963
59
1964
35
1965
31
1966
30
1967
55
1968
20
1969
46
1970
37
1971
30
1972
35
1973
37
1974
44
1975
23
1976
24
1977
22
1978
13
1979
23
1980
27
1981
21
1982
32
1983
19
1984
30
1985
34
1986
26
1987
50
1988
30
1989
38
1990
28
1991
27
1992
16
1993
21
1994
12
1995
25
1996
24
1997
29
1998
3
All-Time Record Progression
4 new records
4 all-time records were set at Merrill between 31 December 1963 and 23 December 1989. Each dot is a new record.
When Merrill set new all-time records
Date
Kind
Detail
1963-12-31
Record daily snowfall
Record daily snowfall 8.4 cm (3.3 in)
1964-01-01
Record daily snowfall
Record daily snowfall 19.6 cm (7.7 in)
1985-01-22
Record low minimum temperature
Record low minimum temperature -20.6 C (-5.1 F)
1989-12-23
Record low maximum temperature
Record low maximum temperature -6.1 C (21.0 F)
Wettest Day of Each Month
Jul: 313.7 mm (12.4 in)
The wettest day on record for each calendar month at Merrill. The most was 313.7 mm (12.4 in) on 6 July 1916.
Record daily precipitation for each month at Merrill
Month
Record daily precipitation (mm)
Date
Jan
147.3 mm (5.8 in)
28 January 1995
Feb
139.7 mm (5.5 in)
1 February 1983
Mar
179.8 mm (7.1 in)
1 March 1907
Apr
269.2 mm (10.6 in)
7 April 1983
May
193.0 mm (7.6 in)
17 May 1980
Jun
198.1 mm (7.8 in)
1 June 1946
Jul
313.7 mm (12.4 in)
6 July 1916
Aug
125.5 mm (4.9 in)
18 August 1969
Sep
228.6 mm (9.0 in)
13 September 1979
Oct
192.5 mm (7.6 in)
1 October 1975
Nov
165.6 mm (6.5 in)
14 November 1961
Dec
157.0 mm (6.2 in)
10 December 1961
Period of Record Coverage
1954 to 1998
Complete yearUnder 90 percent of days
45 years of record at Merrill, 1954 to 1998. 5 years have data for under 90 percent of days and are left out of rankings: 1954, 1981, 1992, 1993, 1998.
Cooler than the station meanWarmer than the station mean
One stripe for each of 36 complete years at Merrill, 1955 to 1997. Blue stripes are years cooler than the station's own mean of 18.3 C (64.9 F); red stripes are warmer. The coolest year was 1983, at 17.0 C (62.7 F), and the warmest was 1957, at 19.4 C (66.9 F). The strongest colour marks a difference of 1.3 C (2.3 F).
Annual mean temperature at Merrill as warming stripes, 1955 to 1997
Year
Annual mean temperature
Difference from the station mean
1955
19.2 C
+0.97 C
1956
19.0 C
+0.77 C
1957
19.4 C
+1.13 C
1958
17.9 C
-0.40 C
1959
18.6 C
+0.28 C
1960
18.1 C
-0.18 C
1961
18.3 C
+0.06 C
1962
18.7 C
+0.46 C
1963
18.3 C
+0.02 C
1964
18.3 C
+0.04 C
1965
18.8 C
+0.50 C
1966
18.0 C
-0.27 C
1968
17.3 C
-0.97 C
1969
17.8 C
-0.47 C
1970
17.7 C
-0.53 C
1971
18.7 C
+0.38 C
1973
18.7 C
+0.42 C
1974
19.1 C
+0.85 C
1975
18.9 C
+0.60 C
1976
17.4 C
-0.85 C
1978
17.8 C
-0.47 C
1979
17.7 C
-0.54 C
1980
18.2 C
-0.04 C
1982
18.9 C
+0.58 C
1983
17.0 C
-1.24 C
1984
18.1 C
-0.19 C
1985
18.0 C
-0.32 C
1986
18.1 C
-0.15 C
1987
17.3 C
-0.94 C
1988
17.4 C
-0.92 C
1989
17.8 C
-0.43 C
1990
19.1 C
+0.82 C
1991
18.7 C
+0.40 C
1994
18.6 C
+0.35 C
1995
18.6 C
+0.30 C
1997
18.4 C
+0.13 C
The fitted trend in annual mean temperature here over 1955 to 1997 is -0.11 C (-0.28 to 0.05) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.2 F (-0.5 to 0.1) per decade. The slope is a straight line fitted to 36 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Merrill
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.11 C (-0.28 to 0.05) per decade
-0.2 F (-0.5 to 0.1) per decade
1955 to 1997
36
Not clearly different from zero
Mean daily maximum
-0.1 C (-0.3 to 0.1) per decade
-0.2 F (-0.5 to 0.1) per decade
1955 to 1997
36
Not clearly different from zero
Mean daily minimum
-0.1 C (-0.4 to 0.1) per decade
-0.2 F (-0.7 to 0.2) per decade
1955 to 1997
36
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
1905 to 1998
Yearly extremes at Merrill: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
42.2 C (108.0 F)
1963
37.2 C (99.0 F)
45
Coldest night (TNn)
-20.6 C (-5.1 F)
1985
-8.9 C (16.0 F)
45
Wettest day (Rx1day)
313.7 mm (12.4 in)
1916
109.2 mm (4.3 in)
94
Wettest five days (Rx5day)
506.7 mm (19.9 in)
1916
165.0 mm (6.5 in)
94
Longest dry spell (CDD)
50 days
1924
22 days
94
Hottest day (TXx)
The hottest day of the year at Merrill, 1905 to 1998. The record is 42.2 C (108.0 F) in 1963, marked on the chart; the median year is 37.2 C (99.0 F).
Hottest day (TXx) at Merrill by year
Year
Hottest day (TXx)
1905
n/a
1906
n/a
1907
n/a
1908
n/a
1909
n/a
1910
n/a
1911
n/a
1912
n/a
1913
n/a
1914
n/a
1915
n/a
1916
n/a
1917
n/a
1918
n/a
1919
n/a
1920
n/a
1921
n/a
1922
n/a
1923
n/a
1924
n/a
1925
n/a
1926
n/a
1927
n/a
1928
n/a
1929
n/a
1930
n/a
1931
n/a
1932
n/a
1933
n/a
1934
n/a
1935
n/a
1936
n/a
1937
n/a
1938
n/a
1939
n/a
1940
n/a
1941
n/a
1942
n/a
1943
n/a
1944
n/a
1945
n/a
1946
n/a
1947
n/a
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
n/a
1954
40.0 C (104.0 F)
1955
37.2 C (99.0 F)
1956
37.8 C (100.0 F)
1957
38.3 C (100.9 F)
1958
36.7 C (98.1 F)
1959
36.7 C (98.1 F)
1960
38.9 C (102.0 F)
1961
35.6 C (96.1 F)
1962
37.2 C (99.0 F)
1963
42.2 C (108.0 F)
1964
38.3 C (100.9 F)
1965
37.2 C (99.0 F)
1966
38.3 C (100.9 F)
1967
38.3 C (100.9 F)
1968
37.8 C (100.0 F)
1969
40.6 C (105.1 F)
1970
38.3 C (100.9 F)
1971
38.3 C (100.9 F)
1972
38.3 C (100.9 F)
1973
36.7 C (98.1 F)
1974
36.7 C (98.1 F)
1975
35.6 C (96.1 F)
1976
36.7 C (98.1 F)
1977
36.7 C (98.1 F)
1978
37.2 C (99.0 F)
1979
37.2 C (99.0 F)
1980
39.4 C (102.9 F)
1981
39.4 C (102.9 F)
1982
38.3 C (100.9 F)
1983
37.2 C (99.0 F)
1984
36.7 C (98.1 F)
1985
40.6 C (105.1 F)
1986
38.3 C (100.9 F)
1987
38.3 C (100.9 F)
1988
40.0 C (104.0 F)
1989
37.2 C (99.0 F)
1990
38.3 C (100.9 F)
1991
35.6 C (96.1 F)
1992
36.1 C (97.0 F)
1993
36.1 C (97.0 F)
1994
35.6 C (96.1 F)
1995
37.2 C (99.0 F)
1996
36.7 C (98.1 F)
1997
36.7 C (98.1 F)
1998
24.4 C (75.9 F)
Coldest night (TNn)
The coldest night of the year at Merrill, 1905 to 1998. The record is -20.6 C (-5.1 F) in 1985, marked on the chart; the median year is -8.9 C (16.0 F).
Coldest night (TNn) at Merrill by year
Year
Coldest night (TNn)
1905
n/a
1906
n/a
1907
n/a
1908
n/a
1909
n/a
1910
n/a
1911
n/a
1912
n/a
1913
n/a
1914
n/a
1915
n/a
1916
n/a
1917
n/a
1918
n/a
1919
n/a
1920
n/a
1921
n/a
1922
n/a
1923
n/a
1924
n/a
1925
n/a
1926
n/a
1927
n/a
1928
n/a
1929
n/a
1930
n/a
1931
n/a
1932
n/a
1933
n/a
1934
n/a
1935
n/a
1936
n/a
1937
n/a
1938
n/a
1939
n/a
1940
n/a
1941
n/a
1942
n/a
1943
n/a
1944
n/a
1945
n/a
1946
n/a
1947
n/a
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
n/a
1954
-7.8 C (18.0 F)
1955
-8.3 C (17.1 F)
1956
-7.8 C (18.0 F)
1957
-10.6 C (12.9 F)
1958
-8.9 C (16.0 F)
1959
-9.4 C (15.1 F)
1960
-10.0 C (14.0 F)
1961
-10.6 C (12.9 F)
1962
-14.4 C (6.1 F)
1963
-14.4 C (6.1 F)
1964
-11.1 C (12.0 F)
1965
-8.9 C (16.0 F)
1966
-12.8 C (9.0 F)
1967
-8.3 C (17.1 F)
1968
-8.9 C (16.0 F)
1969
-8.3 C (17.1 F)
1970
-12.2 C (10.0 F)
1971
-9.4 C (15.1 F)
1972
-6.7 C (19.9 F)
1973
-8.9 C (16.0 F)
1974
-6.7 C (19.9 F)
1975
-7.2 C (19.0 F)
1976
-7.8 C (18.0 F)
1977
-11.1 C (12.0 F)
1978
-7.8 C (18.0 F)
1979
-10.0 C (14.0 F)
1980
-8.3 C (17.1 F)
1981
-9.4 C (15.1 F)
1982
-14.4 C (6.1 F)
1983
-13.3 C (8.1 F)
1984
-11.1 C (12.0 F)
1985
-20.6 C (-5.1 F)
1986
-9.4 C (15.1 F)
1987
-7.2 C (19.0 F)
1988
-9.4 C (15.1 F)
1989
-13.9 C (7.0 F)
1990
-5.6 C (21.9 F)
1991
-7.8 C (18.0 F)
1992
-6.7 C (19.9 F)
1993
-7.2 C (19.0 F)
1994
-7.2 C (19.0 F)
1995
-7.8 C (18.0 F)
1996
-12.2 C (10.0 F)
1997
-8.3 C (17.1 F)
1998
-5.0 C (23.0 F)
Wettest day (Rx1day)
The wettest day of the year at Merrill, 1905 to 1998. The record is 313.7 mm (12.4 in) in 1916, marked on the chart; the median year is 109.2 mm (4.3 in).
Wettest day (Rx1day) at Merrill by year
Year
Wettest day (Rx1day)
1905
139.7 mm (5.5 in)
1906
165.1 mm (6.5 in)
1907
179.8 mm (7.1 in)
1908
81.8 mm (3.2 in)
1909
101.6 mm (4.0 in)
1910
55.9 mm (2.2 in)
1911
95.0 mm (3.7 in)
1912
117.9 mm (4.6 in)
1913
104.6 mm (4.1 in)
1914
127.8 mm (5.0 in)
1915
76.2 mm (3.0 in)
1916
313.7 mm (12.4 in)
1917
90.2 mm (3.6 in)
1918
110.0 mm (4.3 in)
1919
124.5 mm (4.9 in)
1920
116.8 mm (4.6 in)
1921
119.4 mm (4.7 in)
1922
158.8 mm (6.3 in)
1923
88.9 mm (3.5 in)
1924
81.3 mm (3.2 in)
1925
94.5 mm (3.7 in)
1926
73.7 mm (2.9 in)
1927
119.4 mm (4.7 in)
1928
162.6 mm (6.4 in)
1929
109.0 mm (4.3 in)
1930
80.0 mm (3.1 in)
1931
135.9 mm (5.4 in)
1932
91.4 mm (3.6 in)
1933
160.8 mm (6.3 in)
1934
110.0 mm (4.3 in)
1935
92.5 mm (3.6 in)
1936
122.4 mm (4.8 in)
1937
75.9 mm (3.0 in)
1938
149.4 mm (5.9 in)
1939
126.0 mm (5.0 in)
1940
75.4 mm (3.0 in)
1941
78.7 mm (3.1 in)
1942
68.6 mm (2.7 in)
1943
102.9 mm (4.1 in)
1944
135.4 mm (5.3 in)
1945
64.8 mm (2.6 in)
1946
198.1 mm (7.8 in)
1947
91.9 mm (3.6 in)
1948
200.7 mm (7.9 in)
1949
194.6 mm (7.7 in)
1950
71.1 mm (2.8 in)
1951
123.7 mm (4.9 in)
1952
75.9 mm (3.0 in)
1953
108.5 mm (4.3 in)
1954
99.3 mm (3.9 in)
1955
207.0 mm (8.1 in)
1956
95.0 mm (3.7 in)
1957
156.2 mm (6.1 in)
1958
121.9 mm (4.8 in)
1959
177.8 mm (7.0 in)
1960
129.3 mm (5.1 in)
1961
165.6 mm (6.5 in)
1962
82.8 mm (3.3 in)
1963
58.9 mm (2.3 in)
1964
109.2 mm (4.3 in)
1965
97.0 mm (3.8 in)
1966
87.6 mm (3.4 in)
1967
136.7 mm (5.4 in)
1968
61.0 mm (2.4 in)
1969
125.5 mm (4.9 in)
1970
102.6 mm (4.0 in)
1971
95.3 mm (3.8 in)
1972
100.8 mm (4.0 in)
1973
112.0 mm (4.4 in)
1974
87.6 mm (3.4 in)
1975
192.5 mm (7.6 in)
1976
89.7 mm (3.5 in)
1977
154.9 mm (6.1 in)
1978
152.4 mm (6.0 in)
1979
228.6 mm (9.0 in)
1980
193.0 mm (7.6 in)
1981
56.1 mm (2.2 in)
1982
110.5 mm (4.4 in)
1983
269.2 mm (10.6 in)
1984
109.2 mm (4.3 in)
1985
177.8 mm (7.0 in)
1986
83.8 mm (3.3 in)
1987
85.1 mm (3.4 in)
1988
101.6 mm (4.0 in)
1989
81.3 mm (3.2 in)
1990
127.0 mm (5.0 in)
1991
90.2 mm (3.6 in)
1992
145.0 mm (5.7 in)
1993
113.0 mm (4.4 in)
1994
152.4 mm (6.0 in)
1995
147.3 mm (5.8 in)
1996
83.8 mm (3.3 in)
1997
81.3 mm (3.2 in)
1998
78.7 mm (3.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Merrill, 1905 to 1998. The record is 506.7 mm (19.9 in) in 1916, marked on the chart; the median year is 165.0 mm (6.5 in).
Wettest five days (Rx5day) at Merrill by year
Year
Wettest five days (Rx5day)
1905
189.0 mm (7.4 in)
1906
210.8 mm (8.3 in)
1907
202.7 mm (8.0 in)
1908
125.0 mm (4.9 in)
1909
146.7 mm (5.8 in)
1910
123.0 mm (4.8 in)
1911
165.6 mm (6.5 in)
1912
292.6 mm (11.5 in)
1913
221.4 mm (8.7 in)
1914
184.7 mm (7.3 in)
1915
102.6 mm (4.0 in)
1916
506.7 mm (19.9 in)
1917
106.0 mm (4.2 in)
1918
139.7 mm (5.5 in)
1919
152.9 mm (6.0 in)
1920
135.3 mm (5.3 in)
1921
190.2 mm (7.5 in)
1922
170.2 mm (6.7 in)
1923
171.2 mm (6.7 in)
1924
150.1 mm (5.9 in)
1925
219.5 mm (8.6 in)
1926
138.1 mm (5.4 in)
1927
124.5 mm (4.9 in)
1928
331.2 mm (13.0 in)
1929
260.3 mm (10.2 in)
1930
112.0 mm (4.4 in)
1931
305.3 mm (12.0 in)
1932
157.5 mm (6.2 in)
1933
166.6 mm (6.6 in)
1934
173.1 mm (6.8 in)
1935
184.7 mm (7.3 in)
1936
176.1 mm (6.9 in)
1937
100.6 mm (4.0 in)
1938
185.2 mm (7.3 in)
1939
215.4 mm (8.5 in)
1940
149.6 mm (5.9 in)
1941
103.8 mm (4.1 in)
1942
117.9 mm (4.6 in)
1943
190.5 mm (7.5 in)
1944
195.3 mm (7.7 in)
1945
129.5 mm (5.1 in)
1946
224.0 mm (8.8 in)
1947
185.6 mm (7.3 in)
1948
330.5 mm (13.0 in)
1949
220.5 mm (8.7 in)
1950
106.8 mm (4.2 in)
1951
137.7 mm (5.4 in)
1952
117.8 mm (4.6 in)
1953
147.6 mm (5.8 in)
1954
113.8 mm (4.5 in)
1955
401.8 mm (15.8 in)
1956
182.4 mm (7.2 in)
1957
259.6 mm (10.2 in)
1958
214.1 mm (8.4 in)
1959
344.1 mm (13.5 in)
1960
153.2 mm (6.0 in)
1961
299.2 mm (11.8 in)
1962
108.7 mm (4.3 in)
1963
105.7 mm (4.2 in)
1964
147.4 mm (5.8 in)
1965
111.2 mm (4.4 in)
1966
136.2 mm (5.4 in)
1967
167.2 mm (6.6 in)
1968
87.1 mm (3.4 in)
1969
160.3 mm (6.3 in)
1970
109.3 mm (4.3 in)
1971
154.2 mm (6.1 in)
1972
118.8 mm (4.7 in)
1973
214.5 mm (8.4 in)
1974
164.3 mm (6.5 in)
1975
196.3 mm (7.7 in)
1976
109.2 mm (4.3 in)
1977
177.5 mm (7.0 in)
1978
214.4 mm (8.4 in)
1979
231.6 mm (9.1 in)
1980
276.1 mm (10.9 in)
1981
105.1 mm (4.1 in)
1982
149.9 mm (5.9 in)
1983
312.5 mm (12.3 in)
1984
177.8 mm (7.0 in)
1985
229.9 mm (9.1 in)
1986
148.7 mm (5.9 in)
1987
114.8 mm (4.5 in)
1988
139.7 mm (5.5 in)
1989
102.7 mm (4.0 in)
1990
149.4 mm (5.9 in)
1991
189.3 mm (7.5 in)
1992
166.6 mm (6.6 in)
1993
113.0 mm (4.4 in)
1994
174.0 mm (6.9 in)
1995
196.8 mm (7.7 in)
1996
96.5 mm (3.8 in)
1997
132.1 mm (5.2 in)
1998
161.3 mm (6.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Merrill, 1905 to 1998. The record is 50 days in 1924, marked on the chart; the median year is 22 days.
Longest dry spell (CDD) at Merrill by year
Year
Longest dry spell (CDD)
1905
16 days
1906
39 days
1907
23 days
1908
29 days
1909
26 days
1910
24 days
1911
36 days
1912
16 days
1913
36 days
1914
28 days
1915
29 days
1916
20 days
1917
19 days
1918
20 days
1919
14 days
1920
21 days
1921
26 days
1922
21 days
1923
18 days
1924
50 days
1925
29 days
1926
16 days
1927
23 days
1928
17 days
1929
18 days
1930
26 days
1931
23 days
1932
14 days
1933
19 days
1934
21 days
1935
37 days
1936
23 days
1937
15 days
1938
18 days
1939
25 days
1940
22 days
1941
24 days
1942
22 days
1943
20 days
1944
33 days
1945
11 days
1946
17 days
1947
15 days
1948
14 days
1949
21 days
1950
23 days
1951
25 days
1952
47 days
1953
39 days
1954
23 days
1955
22 days
1956
20 days
1957
17 days
1958
13 days
1959
12 days
1960
21 days
1961
24 days
1962
13 days
1963
34 days
1964
23 days
1965
30 days
1966
23 days
1967
28 days
1968
15 days
1969
16 days
1970
20 days
1971
18 days
1972
27 days
1973
16 days
1974
19 days
1975
19 days
1976
20 days
1977
19 days
1978
38 days
1979
31 days
1980
18 days
1981
22 days
1982
17 days
1983
19 days
1984
17 days
1985
25 days
1986
21 days
1987
44 days
1988
32 days
1989
16 days
1990
22 days
1991
29 days
1992
33 days
1993
21 days
1994
17 days
1995
23 days
1996
18 days
1997
24 days
1998
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
36 years with a frost
Across 36 years with a frost, the median last spring frost at Merrill falls on 23 March and the median first autumn frost on 29 October, which leaves a median of 222 days between them.
Fitted over all years, the growing season changes by -0.2 days per decade at this station.
Frost dates and growing season at Merrill
Measure
Median, all years
Earliest period
Recent period (1961 to 1997)
Recent against earliest
Fitted trend
Last spring frost
23 March
n/a
22 March
n/a
-1.0 days per decade
First autumn frost
29 October
n/a
29 October
n/a
-1.2 days per decade
Growing days
222 days
n/a
222 days
n/a
-0.2 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
85 years, 1905 to 1997
A day with at least 109.9 mm (4.3 in) of rain is expected about once in 2 years. A day with at least 266.0 mm (10.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Merrill: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
109.9 mm (4.3 in)
5 years
146.9 mm (5.8 in)
10 years
173.1 mm (6.8 in)
25 years
208.6 mm (8.2 in)
50 years
236.6 mm (9.3 in)
100 years
266.0 mm (10.5 in)
Longer than the 85 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, 85 years of values from 1905 to 1997.
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: 269.2 mm (10.6 in) in 1983; 228.6 mm (9.0 in) in 1979; 207.0 mm (8.1 in) in 1955.
Download the Data
Data for Merrill standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Merrill 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.