Record envelope, standing records and threshold days for Thurman (USC00138231), Iowa, United States, with 52 years of record.
Key Facts for Thurman
Thurman (USC00138231) is a weather station in Iowa, United States at 40.82 latitude and -95.75 longitude, 296 m (971 ft) above sea level.
The station reports from 1897 to 1948, 52 years of record.
1,464 records set at Thurman still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Thurman tied a daily record high maximum temperature of 21.7 C (71.1 F) on 15 November 1948.
About the Station
Location: Iowa, United States, 40.82 latitude, -95.75 longitude.
Elevation: 296 m (971 ft).
Period of record: 1897 to 1948, 52 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 Thurman. 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 Thurman, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
20.6 C (69.1 F)
-36.1 C (-33.0 F)
n/a
n/a
Feb
21.7 C (71.1 F)
-38.3 C (-36.9 F)
n/a
n/a
Mar
32.2 C (90.0 F)
-28.9 C (-20.0 F)
n/a
n/a
Apr
35.0 C (95.0 F)
-16.7 C (1.9 F)
n/a
n/a
May
42.2 C (108.0 F)
-6.7 C (19.9 F)
n/a
n/a
Jun
41.1 C (106.0 F)
2.8 C (37.0 F)
n/a
n/a
Jul
45.6 C (114.1 F)
4.4 C (39.9 F)
n/a
n/a
Aug
44.4 C (111.9 F)
2.8 C (37.0 F)
n/a
n/a
Sep
41.1 C (106.0 F)
-5.0 C (23.0 F)
n/a
n/a
Oct
35.6 C (96.1 F)
-20.6 C (-5.1 F)
n/a
n/a
Nov
30.6 C (87.1 F)
-23.9 C (-11.0 F)
n/a
n/a
Dec
23.3 C (73.9 F)
-37.8 C (-36.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Thurman still stand. 1936 holds the most, with 62.
Standing records at Thurman by the year they were set
Year set
Standing records
1897
23
1898
28
1899
33
1900
14
1901
27
1902
38
1903
23
1904
23
1905
30
1906
23
1907
31
1908
19
1909
28
1910
31
1911
45
1912
40
1913
53
1914
22
1915
33
1916
28
1917
32
1918
29
1919
26
1920
24
1921
27
1922
17
1923
22
1924
30
1925
34
1926
27
1927
18
1928
32
1929
16
1930
41
1931
42
1932
16
1933
30
1934
58
1935
26
1936
62
1937
24
1938
43
1939
37
1940
21
1941
23
1942
14
1943
22
1944
22
1945
6
1946
22
1947
17
1948
12
All-Time Record Progression
4 new records
4 all-time records were set at Thurman between 19 July 1934 and 25 July 1936. Each dot is a new record.
When Thurman set new all-time records
Date
Kind
Detail
1934-07-19
Record high maximum temperature
Record high maximum temperature 43.9 C (111.0 F)
1934-08-08
Record high maximum temperature
Record high maximum temperature 44.4 C (111.9 F)
1936-07-25
Record high maximum temperature
Record high maximum temperature 45.6 C (114.1 F)
1936-07-25
Record high minimum temperature
Record high minimum temperature 28.9 C (84.0 F)
Wettest Day of Each Month
Jul: 246.4 mm (9.7 in)
The wettest day on record for each calendar month at Thurman. The most was 246.4 mm (9.7 in) on 6 July 1898.
Record daily precipitation for each month at Thurman
Month
Record daily precipitation (mm)
Date
Jan
35.6 mm (1.4 in)
5 January 1932
Feb
43.2 mm (1.7 in)
13 February 1919
Mar
88.9 mm (3.5 in)
8 March 1946
Apr
73.7 mm (2.9 in)
9 April 1922
May
121.9 mm (4.8 in)
22 May 1903
Jun
158.5 mm (6.2 in)
15 June 1900
Jul
246.4 mm (9.7 in)
6 July 1898
Aug
127.8 mm (5.0 in)
17 August 1915
Sep
198.1 mm (7.8 in)
15 September 1941
Oct
78.2 mm (3.1 in)
26 October 1918
Nov
100.6 mm (4.0 in)
13 November 1909
Dec
47.0 mm (1.9 in)
9 December 1907
Period of Record Coverage
1897 to 1948
Complete yearUnder 90 percent of days
52 years of record at Thurman, 1897 to 1948. 6 years have data for under 90 percent of days and are left out of rankings: 1897, 1932, 1942, 1944, 1945, 1948.
Cooler than the station meanWarmer than the station mean
One stripe for each of 42 complete years at Thurman, 1898 to 1947. Blue stripes are years cooler than the station's own mean of 10.8 C (51.5 F); red stripes are warmer. The coolest year was 1917, at 9.0 C (48.2 F), and the warmest was 1931, at 12.9 C (55.2 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Thurman as warming stripes, 1898 to 1947
Year
Annual mean temperature
Difference from the station mean
1898
10.0 C
-0.89 C
1899
10.0 C
-0.86 C
1900
10.9 C
+0.05 C
1901
10.3 C
-0.56 C
1904
9.2 C
-1.64 C
1905
9.8 C
-1.03 C
1906
10.3 C
-0.55 C
1907
10.0 C
-0.82 C
1908
11.0 C
+0.11 C
1909
9.8 C
-1.01 C
1910
10.4 C
-0.40 C
1911
11.1 C
+0.29 C
1912
9.1 C
-1.77 C
1913
11.0 C
+0.19 C
1914
10.8 C
-0.01 C
1915
9.6 C
-1.23 C
1917
9.0 C
-1.82 C
1918
11.3 C
+0.41 C
1919
10.6 C
-0.26 C
1920
10.2 C
-0.61 C
1921
12.9 C
+2.04 C
1922
11.3 C
+0.49 C
1923
10.5 C
-0.37 C
1924
9.5 C
-1.35 C
1925
11.1 C
+0.21 C
1926
11.2 C
+0.31 C
1927
11.1 C
+0.28 C
1928
11.4 C
+0.53 C
1929
9.7 C
-1.13 C
1930
11.7 C
+0.82 C
1931
12.9 C
+2.04 C
1933
11.9 C
+1.08 C
1934
12.6 C
+1.80 C
1935
11.2 C
+0.39 C
1936
10.5 C
-0.37 C
1938
12.7 C
+1.89 C
1939
12.8 C
+1.92 C
1940
10.4 C
-0.44 C
1941
12.4 C
+1.55 C
1943
10.7 C
-0.11 C
1946
11.9 C
+1.06 C
1947
10.6 C
-0.20 C
The annual mean temperature here has risen by 0.4 C (0.2 to 0.6) per decade over 1898 to 1947. In Fahrenheit: 0.7 F (0.4 to 1.1) per decade. The slope is a straight line fitted to 42 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Thurman
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.4 C (0.2 to 0.6) per decade
0.7 F (0.4 to 1.1) per decade
1898 to 1947
42
Rise
Mean daily maximum
0.5 C (0.3 to 0.8) per decade
1.0 F (0.5 to 1.4) per decade
1898 to 1947
42
Rise
Mean daily minimum
0.3 C (0.1 to 0.5) per decade
0.5 F (0.1 to 0.8) per decade
1898 to 1947
42
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
1897 to 1948
Yearly extremes at Thurman: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
45.6 C (114.1 F)
1936
37.8 C (100.0 F)
52
Coldest night (TNn)
-38.3 C (-36.9 F)
1905
-28.6 C (-19.5 F)
52
Wettest day (Rx1day)
246.4 mm (9.7 in)
1898
77.7 mm (3.1 in)
52
Wettest five days (Rx5day)
259.7 mm (10.2 in)
1898
102.2 mm (4.0 in)
52
Longest dry spell (CDD)
55 days
1910
30 days
52
Hottest day (TXx)
The hottest day of the year at Thurman, 1897 to 1948. The record is 45.6 C (114.1 F) in 1936, marked on the chart; the median year is 37.8 C (100.0 F).
Hottest day (TXx) at Thurman by year
Year
Hottest day (TXx)
1897
37.8 C (100.0 F)
1898
37.2 C (99.0 F)
1899
35.6 C (96.1 F)
1900
35.6 C (96.1 F)
1901
38.9 C (102.0 F)
1902
35.6 C (96.1 F)
1903
37.8 C (100.0 F)
1904
34.4 C (93.9 F)
1905
35.6 C (96.1 F)
1906
36.7 C (98.1 F)
1907
38.9 C (102.0 F)
1908
35.6 C (96.1 F)
1909
36.7 C (98.1 F)
1910
40.0 C (104.0 F)
1911
41.7 C (107.1 F)
1912
38.9 C (102.0 F)
1913
42.2 C (108.0 F)
1914
38.9 C (102.0 F)
1915
35.0 C (95.0 F)
1916
36.1 C (97.0 F)
1917
39.4 C (102.9 F)
1918
42.8 C (109.0 F)
1919
38.9 C (102.0 F)
1920
37.2 C (99.0 F)
1921
36.7 C (98.1 F)
1922
37.2 C (99.0 F)
1923
36.7 C (98.1 F)
1924
36.7 C (98.1 F)
1925
39.4 C (102.9 F)
1926
38.9 C (102.0 F)
1927
38.3 C (100.9 F)
1928
35.6 C (96.1 F)
1929
36.7 C (98.1 F)
1930
42.8 C (109.0 F)
1931
40.6 C (105.1 F)
1932
37.8 C (100.0 F)
1933
41.1 C (106.0 F)
1934
44.4 C (111.9 F)
1935
41.1 C (106.0 F)
1936
45.6 C (114.1 F)
1937
38.3 C (100.9 F)
1938
40.0 C (104.0 F)
1939
41.1 C (106.0 F)
1940
43.3 C (109.9 F)
1941
40.0 C (104.0 F)
1942
30.6 C (87.1 F)
1943
37.8 C (100.0 F)
1944
37.8 C (100.0 F)
1945
37.8 C (100.0 F)
1946
41.1 C (106.0 F)
1947
37.8 C (100.0 F)
1948
36.7 C (98.1 F)
Coldest night (TNn)
The coldest night of the year at Thurman, 1897 to 1948. The record is -38.3 C (-36.9 F) in 1905, marked on the chart; the median year is -28.6 C (-19.5 F).
Coldest night (TNn) at Thurman by year
Year
Coldest night (TNn)
1897
-28.3 C (-18.9 F)
1898
-23.9 C (-11.0 F)
1899
-31.7 C (-25.1 F)
1900
-25.6 C (-14.1 F)
1901
-32.8 C (-27.0 F)
1902
-32.8 C (-27.0 F)
1903
-26.1 C (-15.0 F)
1904
-28.9 C (-20.0 F)
1905
-38.3 C (-36.9 F)
1906
-25.6 C (-14.1 F)
1907
-27.2 C (-17.0 F)
1908
-26.7 C (-16.1 F)
1909
-27.8 C (-18.0 F)
1910
-34.4 C (-29.9 F)
1911
-30.6 C (-23.1 F)
1912
-33.9 C (-29.0 F)
1913
-31.7 C (-25.1 F)
1914
-28.9 C (-20.0 F)
1915
-34.4 C (-29.9 F)
1916
-30.6 C (-23.1 F)
1917
-30.0 C (-22.0 F)
1918
-34.4 C (-29.9 F)
1919
-37.8 C (-36.0 F)
1920
-29.4 C (-20.9 F)
1921
-20.0 C (-4.0 F)
1922
-21.7 C (-7.1 F)
1923
-24.4 C (-11.9 F)
1924
-35.6 C (-32.1 F)
1925
-27.2 C (-17.0 F)
1926
-27.8 C (-18.0 F)
1927
-23.3 C (-9.9 F)
1928
-23.3 C (-9.9 F)
1929
-26.7 C (-16.1 F)
1930
-36.1 C (-33.0 F)
1931
-18.3 C (-0.9 F)
1932
-25.6 C (-14.1 F)
1933
-28.9 C (-20.0 F)
1934
-26.7 C (-16.1 F)
1935
-24.4 C (-11.9 F)
1936
-35.0 C (-31.0 F)
1937
-25.0 C (-13.0 F)
1938
-26.7 C (-16.1 F)
1939
-24.4 C (-11.9 F)
1940
-31.1 C (-24.0 F)
1941
-16.7 C (1.9 F)
1942
-31.1 C (-24.0 F)
1943
-29.4 C (-20.9 F)
1944
-31.7 C (-25.1 F)
1945
-27.8 C (-18.0 F)
1946
-24.4 C (-11.9 F)
1947
-30.6 C (-23.1 F)
1948
-28.9 C (-20.0 F)
Wettest day (Rx1day)
The wettest day of the year at Thurman, 1897 to 1948. The record is 246.4 mm (9.7 in) in 1898, marked on the chart; the median year is 77.7 mm (3.1 in).
Wettest day (Rx1day) at Thurman by year
Year
Wettest day (Rx1day)
1897
45.7 mm (1.8 in)
1898
246.4 mm (9.7 in)
1899
104.1 mm (4.1 in)
1900
158.5 mm (6.2 in)
1901
61.5 mm (2.4 in)
1902
101.1 mm (4.0 in)
1903
121.9 mm (4.8 in)
1904
159.3 mm (6.3 in)
1905
122.4 mm (4.8 in)
1906
193.0 mm (7.6 in)
1907
83.8 mm (3.3 in)
1908
78.7 mm (3.1 in)
1909
100.6 mm (4.0 in)
1910
85.1 mm (3.4 in)
1911
41.7 mm (1.6 in)
1912
71.4 mm (2.8 in)
1913
86.9 mm (3.4 in)
1914
54.4 mm (2.1 in)
1915
127.8 mm (5.0 in)
1916
57.7 mm (2.3 in)
1917
79.2 mm (3.1 in)
1918
78.2 mm (3.1 in)
1919
97.8 mm (3.9 in)
1920
46.2 mm (1.8 in)
1921
96.0 mm (3.8 in)
1922
77.7 mm (3.1 in)
1923
78.7 mm (3.1 in)
1924
36.1 mm (1.4 in)
1925
66.3 mm (2.6 in)
1926
39.6 mm (1.6 in)
1927
32.0 mm (1.3 in)
1928
88.9 mm (3.5 in)
1929
69.1 mm (2.7 in)
1930
33.5 mm (1.3 in)
1931
66.5 mm (2.6 in)
1932
119.4 mm (4.7 in)
1933
59.7 mm (2.4 in)
1934
61.0 mm (2.4 in)
1935
63.5 mm (2.5 in)
1936
46.0 mm (1.8 in)
1937
62.2 mm (2.4 in)
1938
63.8 mm (2.5 in)
1939
45.5 mm (1.8 in)
1940
55.9 mm (2.2 in)
1941
198.1 mm (7.8 in)
1942
32.0 mm (1.3 in)
1943
82.6 mm (3.3 in)
1944
57.4 mm (2.3 in)
1945
77.7 mm (3.1 in)
1946
165.6 mm (6.5 in)
1947
87.4 mm (3.4 in)
1948
46.5 mm (1.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Thurman, 1897 to 1948. The record is 259.7 mm (10.2 in) in 1898, marked on the chart; the median year is 102.2 mm (4.0 in).
Wettest five days (Rx5day) at Thurman by year
Year
Wettest five days (Rx5day)
1897
69.0 mm (2.7 in)
1898
259.7 mm (10.2 in)
1899
110.5 mm (4.4 in)
1900
242.4 mm (9.5 in)
1901
91.9 mm (3.6 in)
1902
111.3 mm (4.4 in)
1903
151.9 mm (6.0 in)
1904
188.6 mm (7.4 in)
1905
225.6 mm (8.9 in)
1906
243.3 mm (9.6 in)
1907
83.8 mm (3.3 in)
1908
106.4 mm (4.2 in)
1909
193.2 mm (7.6 in)
1910
103.9 mm (4.1 in)
1911
83.8 mm (3.3 in)
1912
119.1 mm (4.7 in)
1913
87.4 mm (3.4 in)
1914
88.4 mm (3.5 in)
1915
130.8 mm (5.1 in)
1916
76.3 mm (3.0 in)
1917
118.0 mm (4.6 in)
1918
145.5 mm (5.7 in)
1919
141.7 mm (5.6 in)
1920
64.8 mm (2.6 in)
1921
152.2 mm (6.0 in)
1922
115.9 mm (4.6 in)
1923
169.6 mm (6.7 in)
1924
82.4 mm (3.2 in)
1925
94.3 mm (3.7 in)
1926
108.0 mm (4.3 in)
1927
45.0 mm (1.8 in)
1928
133.1 mm (5.2 in)
1929
83.1 mm (3.3 in)
1930
56.8 mm (2.2 in)
1931
124.8 mm (4.9 in)
1932
134.1 mm (5.3 in)
1933
84.4 mm (3.3 in)
1934
69.1 mm (2.7 in)
1935
83.8 mm (3.3 in)
1936
70.1 mm (2.8 in)
1937
74.4 mm (2.9 in)
1938
93.4 mm (3.7 in)
1939
68.6 mm (2.7 in)
1940
103.1 mm (4.1 in)
1941
241.5 mm (9.5 in)
1942
42.7 mm (1.7 in)
1943
83.9 mm (3.3 in)
1944
69.9 mm (2.8 in)
1945
101.3 mm (4.0 in)
1946
181.6 mm (7.1 in)
1947
98.4 mm (3.9 in)
1948
69.9 mm (2.8 in)
Longest dry spell (CDD)
The longest dry spell of the year at Thurman, 1897 to 1948. The record is 55 days in 1910, marked on the chart; the median year is 30 days.
Longest dry spell (CDD) at Thurman by year
Year
Longest dry spell (CDD)
1897
29 days
1898
20 days
1899
26 days
1900
24 days
1901
31 days
1902
30 days
1903
31 days
1904
52 days
1905
30 days
1906
33 days
1907
25 days
1908
25 days
1909
18 days
1910
55 days
1911
20 days
1912
29 days
1913
28 days
1914
54 days
1915
23 days
1916
23 days
1917
49 days
1918
22 days
1919
30 days
1920
26 days
1921
46 days
1922
31 days
1923
36 days
1924
34 days
1925
26 days
1926
23 days
1927
53 days
1928
36 days
1929
19 days
1930
30 days
1931
30 days
1932
18 days
1933
37 days
1934
36 days
1935
25 days
1936
32 days
1937
35 days
1938
45 days
1939
52 days
1940
27 days
1941
21 days
1942
31 days
1943
36 days
1944
26 days
1945
23 days
1946
43 days
1947
26 days
1948
25 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
42 years with a frost
Across 42 years with a frost, the median last spring frost at Thurman falls on 2 May and the median first autumn frost on 8 October, which leaves a median of 157 days between them.
Fitted over all years, the growing season changes by +1.9 days per decade at this station.
Frost dates and growing season at Thurman
Measure
Median, all years
Earliest period
Recent period (1912 to 1947)
Recent against earliest
Fitted trend
Last spring frost
2 May
n/a
30 April
n/a
-0.5 days per decade
First autumn frost
8 October
n/a
7 October
n/a
+1.4 days per decade
Growing days
157 days
n/a
157 days
n/a
+1.9 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
46 years, 1898 to 1948
A day with at least 74.7 mm (2.9 in) of rain is expected about once in 2 years. A day with at least 276.1 mm (10.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Thurman: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
74.7 mm (2.9 in)
5 years
113.1 mm (4.5 in)
10 years
143.8 mm (5.7 in)
25 years
189.8 mm (7.5 in)
50 years
230.1 mm (9.1 in)
Longer than the 46 years of record
100 years
276.1 mm (10.9 in)
Longer than the 46 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, 46 years of values from 1898 to 1948.
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: 246.4 mm (9.7 in) in 1898; 198.1 mm (7.8 in) in 1941; 193.0 mm (7.6 in) in 1906.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Thurman standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Thurman 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.