Record envelope, standing records and threshold days for Grantsburg (USC00473242), Wisconsin, United States, with 58 years of record.
Key Facts for Grantsburg
Grantsburg (USC00473242) is a weather station in Wisconsin, United States at 45.78 latitude and -92.68 longitude, 336 m (1,102 ft) above sea level.
The station reports from 1893 to 1950, 58 years of record.
1,464 records set at Grantsburg still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Grantsburg tied a daily record low minimum temperature of 5.6 C (42.1 F) on 20 July 1950.
About the Station
Location: Wisconsin, United States, 45.78 latitude, -92.68 longitude.
Elevation: 336 m (1,102 ft).
Period of record: 1893 to 1950, 58 years.
Eligible elements: tmax, tmin, prcp, snow.
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 Grantsburg. 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 Grantsburg, 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)
-45.6 C (-50.1 F)
n/a
n/a
Feb
14.4 C (57.9 F)
-46.1 C (-51.0 F)
n/a
n/a
Mar
27.2 C (81.0 F)
-35.6 C (-32.1 F)
n/a
n/a
Apr
32.2 C (90.0 F)
-22.8 C (-9.0 F)
n/a
n/a
May
42.2 C (108.0 F)
-9.4 C (15.1 F)
n/a
n/a
Jun
40.6 C (105.1 F)
-5.0 C (23.0 F)
n/a
n/a
Jul
42.2 C (108.0 F)
1.1 C (34.0 F)
n/a
n/a
Aug
38.3 C (100.9 F)
-1.1 C (30.0 F)
n/a
n/a
Sep
38.3 C (100.9 F)
-8.9 C (16.0 F)
n/a
n/a
Oct
31.7 C (89.1 F)
-14.4 C (6.1 F)
n/a
n/a
Nov
23.9 C (75.0 F)
-35.6 C (-32.1 F)
n/a
n/a
Dec
14.4 C (57.9 F)
-39.4 C (-38.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Grantsburg still stand. 1894 holds the most, with 50.
Standing records at Grantsburg by the year they were set
Year set
Standing records
1893
32
1894
50
1895
22
1896
24
1897
34
1898
21
1899
25
1900
23
1901
24
1902
18
1903
19
1904
29
1905
22
1906
24
1907
26
1908
23
1909
28
1910
33
1911
31
1912
34
1913
34
1914
16
1915
14
1916
34
1917
23
1918
19
1919
24
1920
31
1921
34
1922
26
1923
27
1924
35
1925
28
1926
19
1927
29
1928
30
1929
30
1930
37
1931
50
1932
22
1933
24
1934
33
1935
27
1936
43
1937
12
1938
9
1939
19
1940
22
1941
18
1942
19
1943
9
1944
16
1945
21
1946
17
1947
23
1948
16
1949
14
1950
18
All-Time Record Progression
3 new records
3 all-time records were set at Grantsburg between 31 May 1934 and 16 February 1936. Each dot is a new record.
When Grantsburg set new all-time records
Date
Kind
Detail
1934-05-31
Record high maximum temperature
Record high maximum temperature 42.2 C (108.0 F)
1935-01-23
Record low minimum temperature
Record low minimum temperature -45.6 C (-50.1 F)
1936-02-16
Record low minimum temperature
Record low minimum temperature -46.1 C (-51.0 F)
Wettest Day of Each Month
Sep: 118.9 mm (4.7 in)
The wettest day on record for each calendar month at Grantsburg. The most was 118.9 mm (4.7 in) on 12 September 1903.
Record daily precipitation for each month at Grantsburg
Month
Record daily precipitation (mm)
Date
Jan
30.5 mm (1.2 in)
3 January 1906
Feb
30.5 mm (1.2 in)
10 February 1909
Mar
38.1 mm (1.5 in)
11 March 1897
Apr
63.5 mm (2.5 in)
25 April 1908
May
73.7 mm (2.9 in)
15 May 1894
Jun
114.3 mm (4.5 in)
24 June 1914
Jul
78.7 mm (3.1 in)
14 July 1907
Aug
113.0 mm (4.4 in)
4 August 1944
Sep
118.9 mm (4.7 in)
12 September 1903
Oct
55.9 mm (2.2 in)
15 October 1933
Nov
40.6 mm (1.6 in)
14 November 1909
Dec
33.5 mm (1.3 in)
6 December 1894
Period of Record Coverage
1893 to 1950
Complete yearUnder 90 percent of days
58 years of record at Grantsburg, 1893 to 1950. 10 years have data for under 90 percent of days and are left out of rankings: 1895, 1896, 1900, 1903, 1904, 1915, 1918, 1919 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 41 complete years at Grantsburg, 1893 to 1947. Blue stripes are years cooler than the station's own mean of 5.7 C (42.3 F); red stripes are warmer. The coolest year was 1917, at 3.6 C (38.5 F), and the warmest was 1931, at 8.6 C (47.4 F). The strongest colour marks a difference of 2.9 C (5.2 F).
Annual mean temperature at Grantsburg as warming stripes, 1893 to 1947
Year
Annual mean temperature
Difference from the station mean
1893
4.3 C
-1.39 C
1897
5.3 C
-0.39 C
1898
6.3 C
+0.56 C
1901
5.8 C
+0.13 C
1905
5.0 C
-0.75 C
1906
5.6 C
-0.11 C
1907
4.1 C
-1.58 C
1908
6.7 C
+1.02 C
1909
5.1 C
-0.62 C
1912
4.6 C
-1.13 C
1913
6.3 C
+0.54 C
1914
5.8 C
+0.12 C
1916
4.2 C
-1.48 C
1917
3.6 C
-2.11 C
1920
5.7 C
-0.04 C
1921
7.2 C
+1.45 C
1922
6.0 C
+0.27 C
1923
5.7 C
-0.03 C
1924
4.8 C
-0.90 C
1925
5.9 C
+0.22 C
1926
5.2 C
-0.50 C
1927
5.0 C
-0.75 C
1928
5.5 C
-0.20 C
1929
4.2 C
-1.53 C
1930
6.1 C
+0.40 C
1931
8.6 C
+2.87 C
1932
5.3 C
-0.37 C
1933
6.0 C
+0.28 C
1934
6.1 C
+0.42 C
1935
5.4 C
-0.33 C
1936
4.5 C
-1.19 C
1938
6.9 C
+1.19 C
1939
6.6 C
+0.91 C
1940
5.5 C
-0.18 C
1941
7.5 C
+1.75 C
1942
6.7 C
+0.96 C
1943
5.7 C
-0.04 C
1944
7.2 C
+1.45 C
1945
5.4 C
-0.31 C
1946
6.7 C
+0.97 C
1947
6.2 C
+0.51 C
The annual mean temperature here has risen by 0.25 C (0.05 to 0.46) per decade over 1893 to 1947. In Fahrenheit: 0.5 F (0.1 to 0.8) per decade. The slope is a straight line fitted to 41 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Grantsburg
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.25 C (0.05 to 0.46) per decade
0.5 F (0.1 to 0.8) per decade
1893 to 1947
41
Rise
Mean daily maximum
0.1 C (-0.1 to 0.4) per decade
0.3 F (-0.1 to 0.6) per decade
1893 to 1947
41
Not clearly different from zero
Mean daily minimum
0.4 C (0.1 to 0.6) per decade
0.6 F (0.2 to 1.1) per decade
1893 to 1947
41
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
1893 to 1950
Yearly extremes at Grantsburg: 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)
1934
36.1 C (97.0 F)
58
Coldest night (TNn)
-46.1 C (-51.0 F)
1936
-37.2 C (-35.0 F)
58
Wettest day (Rx1day)
118.9 mm (4.7 in)
1903
56.9 mm (2.2 in)
58
Wettest five days (Rx5day)
190.5 mm (7.5 in)
1914
87.3 mm (3.4 in)
58
Longest dry spell (CDD)
53 days
1943
25 days
58
Hottest day (TXx)
The hottest day of the year at Grantsburg, 1893 to 1950. The record is 42.2 C (108.0 F) in 1934, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Grantsburg by year
Year
Hottest day (TXx)
1893
36.1 C (97.0 F)
1894
40.6 C (105.1 F)
1895
34.4 C (93.9 F)
1896
36.7 C (98.1 F)
1897
36.7 C (98.1 F)
1898
35.0 C (95.0 F)
1899
34.4 C (93.9 F)
1900
36.1 C (97.0 F)
1901
39.4 C (102.9 F)
1902
33.3 C (91.9 F)
1903
32.2 C (90.0 F)
1904
36.7 C (98.1 F)
1905
33.9 C (93.0 F)
1906
35.6 C (96.1 F)
1907
33.9 C (93.0 F)
1908
35.0 C (95.0 F)
1909
33.3 C (91.9 F)
1910
38.3 C (100.9 F)
1911
37.8 C (100.0 F)
1912
37.2 C (99.0 F)
1913
37.2 C (99.0 F)
1914
37.8 C (100.0 F)
1915
33.9 C (93.0 F)
1916
36.7 C (98.1 F)
1917
38.3 C (100.9 F)
1918
37.8 C (100.0 F)
1919
36.1 C (97.0 F)
1920
35.6 C (96.1 F)
1921
38.9 C (102.0 F)
1922
36.7 C (98.1 F)
1923
35.6 C (96.1 F)
1924
33.3 C (91.9 F)
1925
35.6 C (96.1 F)
1926
35.0 C (95.0 F)
1927
35.6 C (96.1 F)
1928
32.8 C (91.0 F)
1929
36.1 C (97.0 F)
1930
36.7 C (98.1 F)
1931
40.0 C (104.0 F)
1932
37.2 C (99.0 F)
1933
37.8 C (100.0 F)
1934
42.2 C (108.0 F)
1935
35.0 C (95.0 F)
1936
42.2 C (108.0 F)
1937
37.2 C (99.0 F)
1938
32.8 C (91.0 F)
1939
33.3 C (91.9 F)
1940
35.0 C (95.0 F)
1941
35.0 C (95.0 F)
1942
34.4 C (93.9 F)
1943
33.9 C (93.0 F)
1944
34.4 C (93.9 F)
1945
36.1 C (97.0 F)
1946
32.2 C (90.0 F)
1947
38.3 C (100.9 F)
1948
36.1 C (97.0 F)
1949
38.3 C (100.9 F)
1950
34.4 C (93.9 F)
Coldest night (TNn)
The coldest night of the year at Grantsburg, 1893 to 1950. The record is -46.1 C (-51.0 F) in 1936, marked on the chart; the median year is -37.2 C (-35.0 F).
Coldest night (TNn) at Grantsburg by year
Year
Coldest night (TNn)
1893
-32.8 C (-27.0 F)
1894
-37.8 C (-36.0 F)
1895
-42.8 C (-45.0 F)
1896
-31.1 C (-24.0 F)
1897
-37.8 C (-36.0 F)
1898
-37.8 C (-36.0 F)
1899
-43.3 C (-45.9 F)
1900
-36.1 C (-33.0 F)
1901
-39.4 C (-38.9 F)
1902
-37.2 C (-35.0 F)
1903
-40.0 C (-40.0 F)
1904
-41.7 C (-43.1 F)
1905
-37.8 C (-36.0 F)
1906
-37.2 C (-35.0 F)
1907
-42.2 C (-44.0 F)
1908
-37.8 C (-36.0 F)
1909
-36.7 C (-34.1 F)
1910
-37.8 C (-36.0 F)
1911
-41.1 C (-42.0 F)
1912
-44.4 C (-47.9 F)
1913
-35.6 C (-32.1 F)
1914
-34.4 C (-29.9 F)
1915
-41.7 C (-43.1 F)
1916
-38.9 C (-38.0 F)
1917
-39.4 C (-38.9 F)
1918
-34.4 C (-29.9 F)
1919
-35.6 C (-32.1 F)
1920
-32.8 C (-27.0 F)
1921
-32.8 C (-27.0 F)
1922
-43.9 C (-47.0 F)
1923
-39.4 C (-38.9 F)
1924
-36.7 C (-34.1 F)
1925
-38.9 C (-38.0 F)
1926
-35.6 C (-32.1 F)
1927
-40.0 C (-40.0 F)
1928
-34.4 C (-29.9 F)
1929
-41.7 C (-43.1 F)
1930
-37.2 C (-35.0 F)
1931
-26.1 C (-15.0 F)
1932
-35.0 C (-31.0 F)
1933
-41.1 C (-42.0 F)
1934
-33.3 C (-27.9 F)
1935
-45.6 C (-50.1 F)
1936
-46.1 C (-51.0 F)
1937
-37.2 C (-35.0 F)
1938
-31.7 C (-25.1 F)
1939
-36.1 C (-33.0 F)
1940
-31.7 C (-25.1 F)
1941
-31.1 C (-24.0 F)
1942
-31.1 C (-24.0 F)
1943
-36.7 C (-34.1 F)
1944
-28.3 C (-18.9 F)
1945
-33.9 C (-29.0 F)
1946
-36.7 C (-34.1 F)
1947
-27.8 C (-18.0 F)
1948
-35.6 C (-32.1 F)
1949
-31.7 C (-25.1 F)
1950
-40.0 C (-40.0 F)
Wettest day (Rx1day)
The wettest day of the year at Grantsburg, 1893 to 1950. The record is 118.9 mm (4.7 in) in 1903, marked on the chart; the median year is 56.9 mm (2.2 in).
Wettest day (Rx1day) at Grantsburg by year
Year
Wettest day (Rx1day)
1893
45.7 mm (1.8 in)
1894
73.7 mm (2.9 in)
1895
55.9 mm (2.2 in)
1896
50.8 mm (2.0 in)
1897
58.4 mm (2.3 in)
1898
54.6 mm (2.1 in)
1899
52.1 mm (2.1 in)
1900
53.3 mm (2.1 in)
1901
53.3 mm (2.1 in)
1902
61.0 mm (2.4 in)
1903
118.9 mm (4.7 in)
1904
58.4 mm (2.3 in)
1905
77.5 mm (3.1 in)
1906
61.0 mm (2.4 in)
1907
97.8 mm (3.9 in)
1908
63.5 mm (2.5 in)
1909
76.2 mm (3.0 in)
1910
48.3 mm (1.9 in)
1911
43.2 mm (1.7 in)
1912
64.8 mm (2.6 in)
1913
38.4 mm (1.5 in)
1914
114.3 mm (4.5 in)
1915
56.6 mm (2.2 in)
1916
57.2 mm (2.3 in)
1917
58.7 mm (2.3 in)
1918
33.5 mm (1.3 in)
1919
50.8 mm (2.0 in)
1920
50.3 mm (2.0 in)
1921
35.8 mm (1.4 in)
1922
35.1 mm (1.4 in)
1923
45.5 mm (1.8 in)
1924
78.0 mm (3.1 in)
1925
71.6 mm (2.8 in)
1926
47.2 mm (1.9 in)
1927
57.2 mm (2.3 in)
1928
46.2 mm (1.8 in)
1929
64.8 mm (2.6 in)
1930
42.7 mm (1.7 in)
1931
88.1 mm (3.5 in)
1932
39.4 mm (1.6 in)
1933
55.9 mm (2.2 in)
1934
61.0 mm (2.4 in)
1935
70.9 mm (2.8 in)
1936
64.0 mm (2.5 in)
1937
59.4 mm (2.3 in)
1938
54.1 mm (2.1 in)
1939
55.1 mm (2.2 in)
1940
44.5 mm (1.8 in)
1941
111.8 mm (4.4 in)
1942
73.7 mm (2.9 in)
1943
35.1 mm (1.4 in)
1944
113.0 mm (4.4 in)
1945
83.6 mm (3.3 in)
1946
50.8 mm (2.0 in)
1947
58.4 mm (2.3 in)
1948
31.8 mm (1.3 in)
1949
35.1 mm (1.4 in)
1950
58.9 mm (2.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Grantsburg, 1893 to 1950. The record is 190.5 mm (7.5 in) in 1914, marked on the chart; the median year is 87.3 mm (3.4 in).
Wettest five days (Rx5day) at Grantsburg by year
Year
Wettest five days (Rx5day)
1893
66.0 mm (2.6 in)
1894
117.4 mm (4.6 in)
1895
68.6 mm (2.7 in)
1896
89.5 mm (3.5 in)
1897
102.8 mm (4.0 in)
1898
115.6 mm (4.6 in)
1899
99.8 mm (3.9 in)
1900
146.8 mm (5.8 in)
1901
72.4 mm (2.9 in)
1902
96.5 mm (3.8 in)
1903
130.4 mm (5.1 in)
1904
86.4 mm (3.4 in)
1905
114.8 mm (4.5 in)
1906
75.7 mm (3.0 in)
1907
162.6 mm (6.4 in)
1908
56.7 mm (2.2 in)
1909
130.8 mm (5.1 in)
1910
48.3 mm (1.9 in)
1911
87.7 mm (3.5 in)
1912
96.5 mm (3.8 in)
1913
59.2 mm (2.3 in)
1914
190.5 mm (7.5 in)
1915
91.1 mm (3.6 in)
1916
78.3 mm (3.1 in)
1917
76.5 mm (3.0 in)
1918
59.2 mm (2.3 in)
1919
63.5 mm (2.5 in)
1920
112.5 mm (4.4 in)
1921
58.9 mm (2.3 in)
1922
61.0 mm (2.4 in)
1923
81.0 mm (3.2 in)
1924
100.1 mm (3.9 in)
1925
136.1 mm (5.4 in)
1926
77.5 mm (3.1 in)
1927
91.0 mm (3.6 in)
1928
97.2 mm (3.8 in)
1929
91.4 mm (3.6 in)
1930
62.5 mm (2.5 in)
1931
111.4 mm (4.4 in)
1932
57.9 mm (2.3 in)
1933
85.6 mm (3.4 in)
1934
104.2 mm (4.1 in)
1935
108.5 mm (4.3 in)
1936
77.0 mm (3.0 in)
1937
77.0 mm (3.0 in)
1938
123.7 mm (4.9 in)
1939
84.1 mm (3.3 in)
1940
61.7 mm (2.4 in)
1941
150.4 mm (5.9 in)
1942
89.7 mm (3.5 in)
1943
80.0 mm (3.1 in)
1944
140.2 mm (5.5 in)
1945
86.8 mm (3.4 in)
1946
92.7 mm (3.6 in)
1947
63.6 mm (2.5 in)
1948
49.8 mm (2.0 in)
1949
61.4 mm (2.4 in)
1950
78.2 mm (3.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at Grantsburg, 1893 to 1950. The record is 53 days in 1943, marked on the chart; the median year is 25 days.
Longest dry spell (CDD) at Grantsburg by year
Year
Longest dry spell (CDD)
1893
20 days
1894
25 days
1895
46 days
1896
21 days
1897
19 days
1898
34 days
1899
23 days
1900
25 days
1901
27 days
1902
25 days
1903
14 days
1904
45 days
1905
32 days
1906
22 days
1907
25 days
1908
30 days
1909
27 days
1910
37 days
1911
24 days
1912
42 days
1913
40 days
1914
22 days
1915
23 days
1916
17 days
1917
33 days
1918
22 days
1919
16 days
1920
20 days
1921
25 days
1922
19 days
1923
18 days
1924
27 days
1925
32 days
1926
17 days
1927
24 days
1928
22 days
1929
19 days
1930
29 days
1931
21 days
1932
22 days
1933
33 days
1934
31 days
1935
17 days
1936
20 days
1937
35 days
1938
22 days
1939
31 days
1940
17 days
1941
19 days
1942
32 days
1943
53 days
1944
27 days
1945
26 days
1946
15 days
1947
31 days
1948
30 days
1949
22 days
1950
19 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
41 years with a frost
Across 41 years with a frost, the median last spring frost at Grantsburg falls on 25 May and the median first autumn frost on 17 September, which leaves a median of 116 days between them.
Fitted over all years, the growing season changes by +0.5 days per decade at this station.
Frost dates and growing season at Grantsburg
Measure
Median, all years
Earliest period
Recent period (1914 to 1947)
Recent against earliest
Fitted trend
Last spring frost
25 May
n/a
24 May
n/a
-0.5 days per decade
First autumn frost
17 September
n/a
17 September
n/a
0.0 days per decade
Growing days
116 days
n/a
113 days
n/a
+0.5 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
44 years, 1896 to 1949
A day with at least 55.7 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 122.9 mm (4.8 in) of rain is expected about once in 100 years.
Rainfall return levels at Grantsburg: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
55.7 mm (2.2 in)
5 years
72.7 mm (2.9 in)
10 years
84.4 mm (3.3 in)
25 years
99.5 mm (3.9 in)
50 years
111.1 mm (4.4 in)
Longer than the 44 years of record
100 years
122.9 mm (4.8 in)
Longer than the 44 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, 44 years of values from 1896 to 1949.
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: 113.0 mm (4.4 in) in 1944; 111.8 mm (4.4 in) in 1941; 97.8 mm (3.9 in) in 1907.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Grantsburg standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Grantsburg 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.