Record envelope, standing records and threshold days for Little Sioux (USC00134867), Iowa, United States, with 46 years of record.
Key Facts for Little Sioux
Little Sioux (USC00134867) is a weather station in Iowa, United States at 41.82 latitude and -96.02 longitude, 317 m (1,040 ft) above sea level.
The station reports from 1904 to 1949, 46 years of record.
1,464 records set at Little Sioux still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Little Sioux set a daily record precipitation of 10.2 mm (0.4 in) on 31 March 1949.
About the Station
Location: Iowa, United States, 41.82 latitude, -96.02 longitude.
Elevation: 317 m (1,040 ft).
Period of record: 1904 to 1949, 46 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 Little Sioux. 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 Little Sioux, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
21.1 C (70.0 F)
-39.4 C (-38.9 F)
n/a
n/a
Feb
21.1 C (70.0 F)
-38.9 C (-38.0 F)
n/a
n/a
Mar
32.2 C (90.0 F)
-28.9 C (-20.0 F)
n/a
n/a
Apr
36.7 C (98.1 F)
-14.4 C (6.1 F)
n/a
n/a
May
41.1 C (106.0 F)
-7.2 C (19.0 F)
n/a
n/a
Jun
42.2 C (108.0 F)
2.2 C (36.0 F)
n/a
n/a
Jul
45.6 C (114.1 F)
6.1 C (43.0 F)
n/a
n/a
Aug
45.0 C (113.0 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
26.7 C (80.1 F)
-26.7 C (-16.1 F)
n/a
n/a
Dec
20.6 C (69.1 F)
-33.9 C (-29.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Little Sioux still stand. 1936 holds the most, with 78.
Standing records at Little Sioux by the year they were set
Year set
Standing records
1904
10
1905
47
1906
21
1907
31
1908
25
1909
33
1910
39
1911
35
1912
35
1913
43
1914
27
1915
39
1916
34
1917
35
1918
32
1919
22
1920
23
1921
31
1922
24
1923
26
1924
36
1925
35
1926
22
1927
28
1928
42
1929
20
1930
48
1931
45
1932
27
1933
33
1934
58
1935
29
1936
78
1937
39
1938
35
1939
45
1940
23
1941
29
1942
26
1943
26
1944
33
1945
23
1946
30
1947
34
1948
8
All-Time Record Progression
4 new records
4 all-time records were set at Little Sioux between 4 July 1936 and 18 August 1936. Each dot is a new record.
When Little Sioux set new all-time records
Date
Kind
Detail
1936-07-04
Record high maximum temperature
Record high maximum temperature 43.9 C (111.0 F)
1936-07-12
Record high minimum temperature
Record high minimum temperature 27.8 C (82.0 F)
1936-07-26
Record high maximum temperature
Record high maximum temperature 45.6 C (114.1 F)
1936-08-18
Record high minimum temperature
Record high minimum temperature 28.3 C (82.9 F)
Wettest Day of Each Month
May: 102.9 mm (4.1 in)
The wettest day on record for each calendar month at Little Sioux. The most was 102.9 mm (4.1 in) on 25 May 1915.
Record daily precipitation for each month at Little Sioux
Month
Record daily precipitation (mm)
Date
Jan
24.6 mm (1.0 in)
5 January 1932
Feb
42.4 mm (1.7 in)
13 February 1919
Mar
35.3 mm (1.4 in)
19 March 1933
Apr
62.5 mm (2.5 in)
11 April 1944
May
102.9 mm (4.1 in)
25 May 1915
Jun
80.8 mm (3.2 in)
8 June 1944
Jul
92.2 mm (3.6 in)
29 July 1922
Aug
101.9 mm (4.0 in)
1 August 1935
Sep
85.9 mm (3.4 in)
6 September 1938
Oct
72.4 mm (2.9 in)
12 October 1928
Nov
59.7 mm (2.4 in)
18 November 1948
Dec
41.9 mm (1.6 in)
10 December 1911
Period of Record Coverage
1904 to 1948
Complete yearUnder 90 percent of days
45 years of record at Little Sioux, 1904 to 1948. 2 years have data for under 90 percent of days and are left out of rankings: 1904, 1948.
Cooler than the station meanWarmer than the station mean
One stripe for each of 40 complete years at Little Sioux, 1905 to 1947. Blue stripes are years cooler than the station's own mean of 10.2 C (50.4 F); red stripes are warmer. The coolest year was 1917, at 7.9 C (46.2 F), and the warmest was 1931, at 12.4 C (54.3 F). The strongest colour marks a difference of 2.3 C (4.1 F).
Annual mean temperature at Little Sioux as warming stripes, 1905 to 1947
Year
Annual mean temperature
Difference from the station mean
1905
9.6 C
-0.63 C
1906
10.1 C
-0.13 C
1907
9.4 C
-0.78 C
1908
10.4 C
+0.24 C
1909
9.1 C
-1.07 C
1910
10.3 C
+0.09 C
1911
10.4 C
+0.23 C
1912
9.0 C
-1.23 C
1914
10.4 C
+0.17 C
1915
9.5 C
-0.69 C
1916
9.1 C
-1.09 C
1917
7.9 C
-2.29 C
1918
10.4 C
+0.24 C
1919
9.7 C
-0.54 C
1920
9.7 C
-0.54 C
1921
11.9 C
+1.71 C
1922
10.8 C
+0.55 C
1925
10.4 C
+0.22 C
1926
10.2 C
+0.03 C
1927
10.0 C
-0.23 C
1928
10.4 C
+0.15 C
1929
8.7 C
-1.47 C
1930
10.9 C
+0.73 C
1931
12.4 C
+2.19 C
1932
8.6 C
-1.59 C
1933
10.7 C
+0.54 C
1934
11.9 C
+1.65 C
1935
10.3 C
+0.09 C
1936
10.4 C
+0.15 C
1937
9.6 C
-0.60 C
1938
11.4 C
+1.16 C
1939
11.3 C
+1.11 C
1940
9.6 C
-0.65 C
1941
11.1 C
+0.92 C
1942
10.3 C
+0.11 C
1943
10.0 C
-0.18 C
1944
10.4 C
+0.16 C
1945
9.8 C
-0.44 C
1946
11.6 C
+1.37 C
1947
10.5 C
+0.25 C
The annual mean temperature here has risen by 0.25 C (0.02 to 0.47) per decade over 1905 to 1947. In Fahrenheit: 0.45 F (0.04 to 0.85) per decade. The slope is a straight line fitted to 40 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Little Sioux
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.25 C (0.02 to 0.47) per decade
0.45 F (0.04 to 0.85) per decade
1905 to 1947
40
Rise
Mean daily maximum
0.1 C (-0.2 to 0.4) per decade
0.2 F (-0.3 to 0.7) per decade
1905 to 1947
40
Not clearly different from zero
Mean daily minimum
0.4 C (0.2 to 0.6) per decade
0.7 F (0.4 to 1.1) per decade
1905 to 1947
40
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
1904 to 1949
Yearly extremes at Little Sioux: 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)
45
Coldest night (TNn)
-39.4 C (-38.9 F)
1912
-28.9 C (-20.0 F)
45
Wettest day (Rx1day)
102.9 mm (4.1 in)
1915
52.8 mm (2.1 in)
46
Wettest five days (Rx5day)
179.3 mm (7.1 in)
1915
82.9 mm (3.3 in)
46
Longest dry spell (CDD)
56 days
1924
28 days
46
Hottest day (TXx)
The hottest day of the year at Little Sioux, 1904 to 1949. 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 Little Sioux by year
Year
Hottest day (TXx)
1904
34.4 C (93.9 F)
1905
36.7 C (98.1 F)
1906
35.6 C (96.1 F)
1907
36.1 C (97.0 F)
1908
35.0 C (95.0 F)
1909
37.2 C (99.0 F)
1910
37.8 C (100.0 F)
1911
42.2 C (108.0 F)
1912
39.4 C (102.9 F)
1913
39.4 C (102.9 F)
1914
38.3 C (100.9 F)
1915
36.1 C (97.0 F)
1916
37.8 C (100.0 F)
1917
38.9 C (102.0 F)
1918
41.7 C (107.1 F)
1919
37.8 C (100.0 F)
1920
36.1 C (97.0 F)
1921
36.1 C (97.0 F)
1922
37.8 C (100.0 F)
1923
37.2 C (99.0 F)
1924
35.0 C (95.0 F)
1925
38.9 C (102.0 F)
1926
40.6 C (105.1 F)
1927
36.7 C (98.1 F)
1928
36.1 C (97.0 F)
1929
36.1 C (97.0 F)
1930
42.2 C (108.0 F)
1931
41.7 C (107.1 F)
1932
36.1 C (97.0 F)
1933
39.4 C (102.9 F)
1934
42.8 C (109.0 F)
1935
40.6 C (105.1 F)
1936
45.6 C (114.1 F)
1937
40.0 C (104.0 F)
1938
38.9 C (102.0 F)
1939
41.1 C (106.0 F)
1940
42.2 C (108.0 F)
1941
37.8 C (100.0 F)
1942
38.3 C (100.9 F)
1943
37.2 C (99.0 F)
1944
37.8 C (100.0 F)
1945
36.7 C (98.1 F)
1946
42.2 C (108.0 F)
1947
39.4 C (102.9 F)
1948
23.9 C (75.0 F)
1949
n/a
Coldest night (TNn)
The coldest night of the year at Little Sioux, 1904 to 1949. The record is -39.4 C (-38.9 F) in 1912, marked on the chart; the median year is -28.9 C (-20.0 F).
Coldest night (TNn) at Little Sioux by year
Year
Coldest night (TNn)
1904
-22.8 C (-9.0 F)
1905
-38.9 C (-38.0 F)
1906
-24.4 C (-11.9 F)
1907
-30.0 C (-22.0 F)
1908
-25.0 C (-13.0 F)
1909
-30.0 C (-22.0 F)
1910
-33.3 C (-27.9 F)
1911
-32.8 C (-27.0 F)
1912
-39.4 C (-38.9 F)
1913
-27.8 C (-18.0 F)
1914
-27.8 C (-18.0 F)
1915
-28.9 C (-20.0 F)
1916
-31.7 C (-25.1 F)
1917
-33.9 C (-29.0 F)
1918
-33.9 C (-29.0 F)
1919
-32.2 C (-26.0 F)
1920
-29.4 C (-20.9 F)
1921
-23.3 C (-9.9 F)
1922
-24.4 C (-11.9 F)
1923
-23.9 C (-11.0 F)
1924
-37.2 C (-35.0 F)
1925
-25.0 C (-13.0 F)
1926
-24.4 C (-11.9 F)
1927
-26.1 C (-15.0 F)
1928
-24.4 C (-11.9 F)
1929
-28.3 C (-18.9 F)
1930
-28.9 C (-20.0 F)
1931
-21.1 C (-6.0 F)
1932
-30.0 C (-22.0 F)
1933
-32.2 C (-26.0 F)
1934
-27.2 C (-17.0 F)
1935
-26.7 C (-16.1 F)
1936
-32.2 C (-26.0 F)
1937
-28.3 C (-18.9 F)
1938
-26.1 C (-15.0 F)
1939
-30.6 C (-23.1 F)
1940
-30.0 C (-22.0 F)
1941
-20.0 C (-4.0 F)
1942
-28.9 C (-20.0 F)
1943
-30.0 C (-22.0 F)
1944
-31.1 C (-24.0 F)
1945
-25.0 C (-13.0 F)
1946
-26.1 C (-15.0 F)
1947
-25.6 C (-14.1 F)
1948
-31.7 C (-25.1 F)
1949
n/a
Wettest day (Rx1day)
The wettest day of the year at Little Sioux, 1904 to 1949. The record is 102.9 mm (4.1 in) in 1915, marked on the chart; the median year is 52.8 mm (2.1 in).
Wettest day (Rx1day) at Little Sioux by year
Year
Wettest day (Rx1day)
1904
22.4 mm (0.9 in)
1905
52.6 mm (2.1 in)
1906
71.6 mm (2.8 in)
1907
49.8 mm (2.0 in)
1908
55.4 mm (2.2 in)
1909
52.8 mm (2.1 in)
1910
91.4 mm (3.6 in)
1911
41.9 mm (1.6 in)
1912
67.3 mm (2.6 in)
1913
39.6 mm (1.6 in)
1914
76.7 mm (3.0 in)
1915
102.9 mm (4.1 in)
1916
39.4 mm (1.6 in)
1917
47.0 mm (1.9 in)
1918
48.3 mm (1.9 in)
1919
42.4 mm (1.7 in)
1920
40.4 mm (1.6 in)
1921
50.5 mm (2.0 in)
1922
92.2 mm (3.6 in)
1923
46.7 mm (1.8 in)
1924
51.1 mm (2.0 in)
1925
58.2 mm (2.3 in)
1926
65.5 mm (2.6 in)
1927
43.4 mm (1.7 in)
1928
72.4 mm (2.9 in)
1929
75.4 mm (3.0 in)
1930
68.3 mm (2.7 in)
1931
37.8 mm (1.5 in)
1932
61.0 mm (2.4 in)
1933
38.4 mm (1.5 in)
1934
52.1 mm (2.1 in)
1935
101.9 mm (4.0 in)
1936
40.1 mm (1.6 in)
1937
81.3 mm (3.2 in)
1938
85.9 mm (3.4 in)
1939
27.7 mm (1.1 in)
1940
81.0 mm (3.2 in)
1941
35.3 mm (1.4 in)
1942
52.8 mm (2.1 in)
1943
48.5 mm (1.9 in)
1944
80.8 mm (3.2 in)
1945
61.2 mm (2.4 in)
1946
76.5 mm (3.0 in)
1947
67.1 mm (2.6 in)
1948
59.7 mm (2.4 in)
1949
25.4 mm (1.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Little Sioux, 1904 to 1949. The record is 179.3 mm (7.1 in) in 1915, marked on the chart; the median year is 82.9 mm (3.3 in).
Wettest five days (Rx5day) at Little Sioux by year
Year
Wettest five days (Rx5day)
1904
22.9 mm (0.9 in)
1905
63.0 mm (2.5 in)
1906
92.5 mm (3.6 in)
1907
97.0 mm (3.8 in)
1908
106.9 mm (4.2 in)
1909
90.2 mm (3.6 in)
1910
130.5 mm (5.1 in)
1911
52.4 mm (2.1 in)
1912
80.3 mm (3.2 in)
1913
73.6 mm (2.9 in)
1914
99.3 mm (3.9 in)
1915
179.3 mm (7.1 in)
1916
49.3 mm (1.9 in)
1917
80.5 mm (3.2 in)
1918
104.6 mm (4.1 in)
1919
74.7 mm (2.9 in)
1920
67.8 mm (2.7 in)
1921
85.6 mm (3.4 in)
1922
120.1 mm (4.7 in)
1923
90.6 mm (3.6 in)
1924
60.2 mm (2.4 in)
1925
82.0 mm (3.2 in)
1926
87.7 mm (3.5 in)
1927
64.0 mm (2.5 in)
1928
143.8 mm (5.7 in)
1929
82.3 mm (3.2 in)
1930
81.7 mm (3.2 in)
1931
64.2 mm (2.5 in)
1932
74.2 mm (2.9 in)
1933
62.0 mm (2.4 in)
1934
98.8 mm (3.9 in)
1935
123.7 mm (4.9 in)
1936
80.7 mm (3.2 in)
1937
111.9 mm (4.4 in)
1938
107.3 mm (4.2 in)
1939
62.5 mm (2.5 in)
1940
98.6 mm (3.9 in)
1941
84.3 mm (3.3 in)
1942
58.4 mm (2.3 in)
1943
77.2 mm (3.0 in)
1944
178.6 mm (7.0 in)
1945
95.7 mm (3.8 in)
1946
83.4 mm (3.3 in)
1947
86.4 mm (3.4 in)
1948
69.9 mm (2.8 in)
1949
30.5 mm (1.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Little Sioux, 1904 to 1949. The record is 56 days in 1924, marked on the chart; the median year is 28 days.
Longest dry spell (CDD) at Little Sioux by year
Year
Longest dry spell (CDD)
1904
35 days
1905
29 days
1906
27 days
1907
27 days
1908
25 days
1909
18 days
1910
50 days
1911
34 days
1912
26 days
1913
44 days
1914
46 days
1915
28 days
1916
28 days
1917
29 days
1918
20 days
1919
31 days
1920
26 days
1921
35 days
1922
29 days
1923
26 days
1924
56 days
1925
28 days
1926
40 days
1927
22 days
1928
28 days
1929
18 days
1930
27 days
1931
26 days
1932
23 days
1933
28 days
1934
35 days
1935
31 days
1936
27 days
1937
29 days
1938
27 days
1939
48 days
1940
25 days
1941
21 days
1942
31 days
1943
36 days
1944
22 days
1945
37 days
1946
25 days
1947
35 days
1948
22 days
1949
3 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
40 years with a frost
Across 40 years with a frost, the median last spring frost at Little Sioux falls on 6 May and the median first autumn frost on 30 September, which leaves a median of 150 days between them.
Fitted over all years, the growing season changes by -0.3 days per decade at this station.
Frost dates and growing season at Little Sioux
Measure
Median, all years
Earliest period
Recent period (1916 to 1947)
Recent against earliest
Fitted trend
Last spring frost
6 May
n/a
5 May
n/a
-1.1 days per decade
First autumn frost
30 September
n/a
30 September
n/a
-1.4 days per decade
Growing days
150 days
n/a
150 days
n/a
-0.3 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
42 years, 1905 to 1947
A day with at least 57.4 mm (2.3 in) of rain is expected about once in 2 years. A day with at least 119.3 mm (4.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Little Sioux: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
57.4 mm (2.3 in)
5 years
75.2 mm (3.0 in)
10 years
86.5 mm (3.4 in)
25 years
100.2 mm (3.9 in)
50 years
109.9 mm (4.3 in)
Longer than the 42 years of record
100 years
119.3 mm (4.7 in)
Longer than the 42 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, 42 years of values from 1905 to 1947.
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: 102.9 mm (4.1 in) in 1915; 101.9 mm (4.0 in) in 1935; 92.2 mm (3.6 in) in 1922.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Little Sioux, at 1916. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1916 ran 0.3 C (0.5 F) lower than in the years before (possible change).
Suspected changes in the annual mean temperature at Little Sioux, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1916
-0.3
-0.5
possible
5
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
Data for Little Sioux standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Little Sioux 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.