Record envelope, standing records and threshold days for Cassopolis (USC00201363), Michigan, United States, with 35 years of record.
Key Facts for Cassopolis
Cassopolis (USC00201363) is a weather station in Michigan, United States at 41.90 latitude and -86.02 longitude, 275 m (903 ft) above sea level.
The station reports from 1900 to 1934, 35 years of record.
1,464 records set at Cassopolis still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Cassopolis set a daily record low minimum temperature of -20.0 C (-4.0 F) on 27 December 1934.
About the Station
Location: Michigan, United States, 41.90 latitude, -86.02 longitude.
Elevation: 275 m (903 ft).
Period of record: 1900 to 1934, 35 years.
Eligible elements: tmax, tmin, prcp.
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 Cassopolis. 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 Cassopolis, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
19.4 C (66.9 F)
-28.9 C (-20.0 F)
n/a
n/a
Feb
19.4 C (66.9 F)
-30.6 C (-23.1 F)
n/a
n/a
Mar
29.4 C (84.9 F)
-21.1 C (-6.0 F)
n/a
n/a
Apr
33.3 C (91.9 F)
-12.8 C (9.0 F)
n/a
n/a
May
36.1 C (97.0 F)
-4.4 C (24.1 F)
n/a
n/a
Jun
38.3 C (100.9 F)
0.6 C (33.1 F)
n/a
n/a
Jul
40.0 C (104.0 F)
2.2 C (36.0 F)
n/a
n/a
Aug
39.4 C (102.9 F)
1.7 C (35.1 F)
n/a
n/a
Sep
36.7 C (98.1 F)
-0.6 C (30.9 F)
n/a
n/a
Oct
32.8 C (91.0 F)
-8.3 C (17.1 F)
n/a
n/a
Nov
26.1 C (79.0 F)
-17.2 C (1.0 F)
n/a
n/a
Dec
15.0 C (59.0 F)
-27.2 C (-17.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Cassopolis still stand. 1930 holds the most, with 65.
Standing records at Cassopolis by the year they were set
Year set
Standing records
1900
16
1901
45
1902
49
1903
46
1904
39
1905
35
1906
28
1907
51
1908
37
1909
48
1910
45
1911
39
1912
21
1913
22
1914
39
1915
53
1916
54
1917
50
1918
56
1919
29
1920
47
1921
41
1922
23
1923
36
1924
50
1925
59
1926
40
1927
52
1928
30
1929
40
1930
65
1931
50
1932
41
1933
47
1934
41
All-Time Record Progression
2 new records
2 all-time records were set at Cassopolis between 21 July 1934 and 12 September 1934. Each dot is a new record.
When Cassopolis set new all-time records
Date
Kind
Detail
1934-07-21
Record high maximum temperature
Record high maximum temperature 40.0 C (104.0 F)
1934-09-12
Record daily precipitation
Record daily precipitation 99.6 mm (3.9 in)
Wettest Day of Each Month
Sep: 99.6 mm (3.9 in)
The wettest day on record for each calendar month at Cassopolis. The most was 99.6 mm (3.9 in) on 12 September 1934.
Record daily precipitation for each month at Cassopolis
Month
Record daily precipitation (mm)
Date
Jan
43.2 mm (1.7 in)
1 January 1916
Feb
25.4 mm (1.0 in)
1 February 1908
Mar
66.0 mm (2.6 in)
27 March 1907
Apr
57.2 mm (2.3 in)
20 April 1929
May
55.9 mm (2.2 in)
23 May 1902
Jun
65.8 mm (2.6 in)
30 June 1933
Jul
58.4 mm (2.3 in)
9 July 1910
Aug
63.5 mm (2.5 in)
27 August 1903
Sep
99.6 mm (3.9 in)
12 September 1934
Oct
57.9 mm (2.3 in)
22 October 1933
Nov
53.3 mm (2.1 in)
22 November 1909
Dec
62.2 mm (2.4 in)
17 December 1908
Period of Record Coverage
1900 to 1934
Complete yearUnder 90 percent of days
35 years of record at Cassopolis, 1900 to 1934. 6 years have data for under 90 percent of days and are left out of rankings: 1900, 1906, 1911, 1912, 1913, 1914.
Cooler than the station meanWarmer than the station mean
One stripe for each of 26 complete years at Cassopolis, 1901 to 1934. Blue stripes are years cooler than the station's own mean of 9.5 C (49.0 F); red stripes are warmer. The coolest year was 1917, at 7.5 C (45.5 F), and the warmest was 1931, at 11.7 C (53.0 F). The strongest colour marks a difference of 2.3 C (4.1 F).
Annual mean temperature at Cassopolis as warming stripes, 1901 to 1934
Year
Annual mean temperature
Difference from the station mean
1901
9.2 C
-0.25 C
1902
8.6 C
-0.87 C
1904
7.8 C
-1.68 C
1907
8.1 C
-1.32 C
1908
9.6 C
+0.19 C
1909
9.1 C
-0.37 C
1910
9.4 C
-0.04 C
1915
9.7 C
+0.24 C
1916
9.6 C
+0.11 C
1917
7.5 C
-1.97 C
1918
9.5 C
+0.09 C
1919
10.1 C
+0.64 C
1920
9.2 C
-0.24 C
1921
11.6 C
+2.17 C
1922
10.0 C
+0.59 C
1924
7.9 C
-1.52 C
1925
9.7 C
+0.23 C
1926
8.7 C
-0.78 C
1927
9.8 C
+0.36 C
1928
9.4 C
-0.01 C
1929
8.8 C
-0.67 C
1930
10.1 C
+0.65 C
1931
11.7 C
+2.24 C
1932
10.1 C
+0.63 C
1933
10.5 C
+1.08 C
1934
10.0 C
+0.52 C
This station does not have enough complete years (30 are needed) to fit a temperature trend.
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 1934
Yearly extremes at Cassopolis: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
40.0 C (104.0 F)
1934
36.7 C (98.1 F)
35
Coldest night (TNn)
-30.6 C (-23.1 F)
1918
-23.3 C (-9.9 F)
35
Wettest day (Rx1day)
99.6 mm (3.9 in)
1934
50.8 mm (2.0 in)
35
Wettest five days (Rx5day)
139.9 mm (5.5 in)
1934
72.5 mm (2.9 in)
35
Longest dry spell (CDD)
41 days
1908
20 days
35
Hottest day (TXx)
The hottest day of the year at Cassopolis, 1900 to 1934. The record is 40.0 C (104.0 F) in 1934, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Cassopolis by year
Year
Hottest day (TXx)
1900
20.0 C (68.0 F)
1901
38.9 C (102.0 F)
1902
33.3 C (91.9 F)
1903
34.4 C (93.9 F)
1904
34.4 C (93.9 F)
1905
33.3 C (91.9 F)
1906
33.9 C (93.0 F)
1907
31.7 C (89.1 F)
1908
34.4 C (93.9 F)
1909
33.9 C (93.0 F)
1910
37.2 C (99.0 F)
1911
37.8 C (100.0 F)
1912
32.8 C (91.0 F)
1913
36.7 C (98.1 F)
1914
39.4 C (102.9 F)
1915
31.7 C (89.1 F)
1916
39.4 C (102.9 F)
1917
37.2 C (99.0 F)
1918
39.4 C (102.9 F)
1919
37.2 C (99.0 F)
1920
34.4 C (93.9 F)
1921
37.8 C (100.0 F)
1922
36.7 C (98.1 F)
1923
35.6 C (96.1 F)
1924
33.9 C (93.0 F)
1925
37.2 C (99.0 F)
1926
37.2 C (99.0 F)
1927
37.2 C (99.0 F)
1928
34.4 C (93.9 F)
1929
35.0 C (95.0 F)
1930
39.4 C (102.9 F)
1931
37.8 C (100.0 F)
1932
36.7 C (98.1 F)
1933
38.3 C (100.9 F)
1934
40.0 C (104.0 F)
Coldest night (TNn)
The coldest night of the year at Cassopolis, 1900 to 1934. The record is -30.6 C (-23.1 F) in 1918, marked on the chart; the median year is -23.3 C (-9.9 F).
Coldest night (TNn) at Cassopolis by year
Year
Coldest night (TNn)
1900
-17.8 C (0.0 F)
1901
-26.7 C (-16.1 F)
1902
-23.3 C (-9.9 F)
1903
-26.1 C (-15.0 F)
1904
-26.1 C (-15.0 F)
1905
-26.7 C (-16.1 F)
1906
-21.1 C (-6.0 F)
1907
-23.3 C (-9.9 F)
1908
-18.9 C (-2.0 F)
1909
-21.7 C (-7.1 F)
1910
-22.8 C (-9.0 F)
1911
-17.8 C (0.0 F)
1912
-22.8 C (-9.0 F)
1913
-9.4 C (15.1 F)
1914
-22.2 C (-8.0 F)
1915
-23.9 C (-11.0 F)
1916
-23.9 C (-11.0 F)
1917
-27.8 C (-18.0 F)
1918
-30.6 C (-23.1 F)
1919
-25.0 C (-13.0 F)
1920
-26.1 C (-15.0 F)
1921
-17.8 C (0.0 F)
1922
-25.0 C (-13.0 F)
1923
-22.8 C (-9.0 F)
1924
-28.3 C (-18.9 F)
1925
-21.7 C (-7.1 F)
1926
-22.2 C (-8.0 F)
1927
-27.2 C (-17.0 F)
1928
-20.6 C (-5.1 F)
1929
-23.9 C (-11.0 F)
1930
-28.3 C (-18.9 F)
1931
-15.0 C (5.0 F)
1932
-18.9 C (-2.0 F)
1933
-26.1 C (-15.0 F)
1934
-23.9 C (-11.0 F)
Wettest day (Rx1day)
The wettest day of the year at Cassopolis, 1900 to 1934. The record is 99.6 mm (3.9 in) in 1934, marked on the chart; the median year is 50.8 mm (2.0 in).
Wettest day (Rx1day) at Cassopolis by year
Year
Wettest day (Rx1day)
1900
50.8 mm (2.0 in)
1901
53.3 mm (2.1 in)
1902
55.9 mm (2.2 in)
1903
63.5 mm (2.5 in)
1904
55.9 mm (2.2 in)
1905
45.7 mm (1.8 in)
1906
63.5 mm (2.5 in)
1907
66.0 mm (2.6 in)
1908
62.2 mm (2.4 in)
1909
53.3 mm (2.1 in)
1910
58.4 mm (2.3 in)
1911
55.9 mm (2.2 in)
1912
45.7 mm (1.8 in)
1913
0.0 mm (0.00 in)
1914
45.7 mm (1.8 in)
1915
50.8 mm (2.0 in)
1916
64.5 mm (2.5 in)
1917
35.6 mm (1.4 in)
1918
53.3 mm (2.1 in)
1919
39.1 mm (1.5 in)
1920
33.0 mm (1.3 in)
1921
39.4 mm (1.6 in)
1922
47.0 mm (1.9 in)
1923
50.8 mm (2.0 in)
1924
43.4 mm (1.7 in)
1925
50.8 mm (2.0 in)
1926
38.9 mm (1.5 in)
1927
43.7 mm (1.7 in)
1928
34.0 mm (1.3 in)
1929
57.2 mm (2.3 in)
1930
45.5 mm (1.8 in)
1931
53.3 mm (2.1 in)
1932
55.9 mm (2.2 in)
1933
65.8 mm (2.6 in)
1934
99.6 mm (3.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Cassopolis, 1900 to 1934. The record is 139.9 mm (5.5 in) in 1934, marked on the chart; the median year is 72.5 mm (2.9 in).
Wettest five days (Rx5day) at Cassopolis by year
Year
Wettest five days (Rx5day)
1900
63.7 mm (2.5 in)
1901
114.3 mm (4.5 in)
1902
78.7 mm (3.1 in)
1903
99.1 mm (3.9 in)
1904
71.3 mm (2.8 in)
1905
101.6 mm (4.0 in)
1906
86.4 mm (3.4 in)
1907
101.6 mm (4.0 in)
1908
72.4 mm (2.9 in)
1909
63.0 mm (2.5 in)
1910
76.2 mm (3.0 in)
1911
90.2 mm (3.6 in)
1912
45.7 mm (1.8 in)
1913
0.0 mm (0.00 in)
1914
57.9 mm (2.3 in)
1915
97.1 mm (3.8 in)
1916
77.4 mm (3.0 in)
1917
81.4 mm (3.2 in)
1918
80.0 mm (3.1 in)
1919
72.2 mm (2.8 in)
1920
53.9 mm (2.1 in)
1921
75.9 mm (3.0 in)
1922
65.7 mm (2.6 in)
1923
87.7 mm (3.5 in)
1924
90.4 mm (3.6 in)
1925
58.7 mm (2.3 in)
1926
51.3 mm (2.0 in)
1927
65.3 mm (2.6 in)
1928
54.4 mm (2.1 in)
1929
72.4 mm (2.9 in)
1930
64.1 mm (2.5 in)
1931
72.5 mm (2.9 in)
1932
72.4 mm (2.9 in)
1933
98.6 mm (3.9 in)
1934
139.9 mm (5.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Cassopolis, 1900 to 1934. The record is 41 days in 1908, marked on the chart; the median year is 20 days.
Longest dry spell (CDD) at Cassopolis by year
Year
Longest dry spell (CDD)
1900
19 days
1901
19 days
1902
18 days
1903
27 days
1904
32 days
1905
27 days
1906
12 days
1907
19 days
1908
41 days
1909
13 days
1910
24 days
1911
23 days
1912
30 days
1913
13 days
1914
26 days
1915
23 days
1916
25 days
1917
32 days
1918
20 days
1919
38 days
1920
23 days
1921
18 days
1922
23 days
1923
21 days
1924
14 days
1925
27 days
1926
14 days
1927
18 days
1928
15 days
1929
21 days
1930
20 days
1931
18 days
1932
19 days
1933
15 days
1934
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
26 years with a frost
Across 26 years with a frost, the median last spring frost at Cassopolis falls on 4 May and the median first autumn frost on 14 October, which leaves a median of 167 days between them.
Fitted over all years, the growing season changes by +0.1 days per decade at this station.
Frost dates and growing season at Cassopolis
Measure
Median, all years
Earliest period
Recent period (1901 to 1934)
Recent against earliest
Fitted trend
Last spring frost
4 May
n/a
4 May
n/a
+1.3 days per decade
First autumn frost
14 October
n/a
14 October
n/a
+1.4 days per decade
Growing days
167 days
n/a
167 days
n/a
+0.1 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.
Download the Data
Data for Cassopolis standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Cassopolis 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.