Record envelope, standing records and threshold days for Millerton (USC00135517), Iowa, United States, with 59 years of record.
Key Facts for Millerton
Millerton (USC00135517) is a weather station in Iowa, United States at 40.83 latitude and -93.30 longitude, 326 m (1,070 ft) above sea level.
The station reports from 1893 to 1951, 59 years of record.
1,464 records set at Millerton still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Millerton set a daily record high minimum temperature of 2.8 C (37.0 F) on 26 February 1951.
About the Station
Location: Iowa, United States, 40.83 latitude, -93.30 longitude.
Elevation: 326 m (1,070 ft).
Period of record: 1893 to 1951, 59 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 Millerton. 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 Millerton, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
17.8 C (64.0 F)
-34.4 C (-29.9 F)
n/a
n/a
Feb
22.8 C (73.0 F)
-35.0 C (-31.0 F)
n/a
n/a
Mar
31.1 C (88.0 F)
-25.6 C (-14.1 F)
n/a
n/a
Apr
33.3 C (91.9 F)
-13.9 C (7.0 F)
n/a
n/a
May
38.3 C (100.9 F)
-6.1 C (21.0 F)
n/a
n/a
Jun
40.0 C (104.0 F)
2.8 C (37.0 F)
n/a
n/a
Jul
45.0 C (113.0 F)
7.2 C (45.0 F)
n/a
n/a
Aug
43.9 C (111.0 F)
2.2 C (36.0 F)
n/a
n/a
Sep
40.6 C (105.1 F)
-5.0 C (23.0 F)
n/a
n/a
Oct
35.0 C (95.0 F)
-18.3 C (-0.9 F)
n/a
n/a
Nov
28.3 C (82.9 F)
-20.6 C (-5.1 F)
n/a
n/a
Dec
20.6 C (69.1 F)
-31.1 C (-24.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Millerton still stand. 1936 holds the most, with 77.
Standing records at Millerton by the year they were set
Year set
Standing records
1893
15
1894
46
1895
30
1896
30
1897
39
1898
18
1899
36
1900
13
1901
34
1902
30
1903
26
1904
17
1905
23
1906
21
1907
23
1908
29
1909
38
1910
22
1911
33
1912
28
1913
42
1914
25
1915
29
1916
18
1917
36
1918
29
1919
14
1920
16
1921
24
1922
21
1923
15
1924
33
1925
31
1926
14
1927
20
1928
16
1929
21
1930
45
1931
22
1932
20
1933
22
1934
45
1935
17
1936
77
1937
24
1938
18
1939
32
1940
19
1941
13
1942
25
1943
17
1944
15
1945
14
1946
26
1947
19
1948
11
1949
13
1950
13
1951
2
All-Time Record Progression
7 new records
7 all-time records were set at Millerton between 5 January 1924 and 14 July 1936. Each dot is a new record.
When Millerton set new all-time records
Date
Kind
Detail
1924-01-05
Record low maximum temperature
Record low maximum temperature -22.8 C (-9.0 F)
1930-07-27
Record high minimum temperature
Record high minimum temperature 27.2 C (81.0 F)
1930-08-04
Record high minimum temperature
Record high minimum temperature 28.3 C (82.9 F)
1934-07-19
Record high minimum temperature
Record high minimum temperature 28.9 C (84.0 F)
1936-02-05
Record snow depth
Record snow depth 533.4 cm (210.0 in)
1936-02-22
Record snow depth
Record snow depth 558.8 cm (220.0 in)
1936-07-14
Record high maximum temperature
Record high maximum temperature 45.0 C (113.0 F)
Wettest Day of Each Month
Aug: 205.7 mm (8.1 in)
The wettest day on record for each calendar month at Millerton. The most was 205.7 mm (8.1 in) on 27 August 1903.
Record daily precipitation for each month at Millerton
Month
Record daily precipitation (mm)
Date
Jan
63.5 mm (2.5 in)
25 January 1898
Feb
71.6 mm (2.8 in)
17 February 1911
Mar
51.6 mm (2.0 in)
24 March 1920
Apr
82.3 mm (3.2 in)
24 April 1897
May
84.3 mm (3.3 in)
2 May 1912
Jun
146.8 mm (5.8 in)
18 June 1946
Jul
132.8 mm (5.2 in)
18 July 1902
Aug
205.7 mm (8.1 in)
27 August 1903
Sep
142.0 mm (5.6 in)
3 September 1926
Oct
77.7 mm (3.1 in)
29 October 1896
Nov
63.0 mm (2.5 in)
17 November 1928
Dec
50.8 mm (2.0 in)
3 December 1897
Period of Record Coverage
1893 to 1951
Complete yearUnder 90 percent of days
59 years of record at Millerton, 1893 to 1951. 6 years have data for under 90 percent of days and are left out of rankings: 1893, 1911, 1927, 1928, 1950, 1951.
Cooler than the station meanWarmer than the station mean
One stripe for each of 48 complete years at Millerton, 1894 to 1948. Blue stripes are years cooler than the station's own mean of 10.4 C (50.7 F); red stripes are warmer. The coolest year was 1917, at 8.6 C (47.5 F), and the warmest was 1921, at 12.6 C (54.7 F). The strongest colour marks a difference of 2.3 C (4.1 F).
Annual mean temperature at Millerton as warming stripes, 1894 to 1948
Year
Annual mean temperature
Difference from the station mean
1894
11.2 C
+0.84 C
1895
9.4 C
-0.99 C
1896
10.4 C
+0.01 C
1897
10.2 C
-0.22 C
1898
9.7 C
-0.73 C
1899
9.8 C
-0.61 C
1900
10.5 C
+0.12 C
1901
10.5 C
+0.16 C
1902
9.7 C
-0.68 C
1903
9.4 C
-0.97 C
1904
9.3 C
-1.12 C
1905
9.9 C
-0.44 C
1906
10.6 C
+0.18 C
1907
10.3 C
-0.10 C
1908
11.2 C
+0.80 C
1909
10.3 C
-0.09 C
1910
10.4 C
+0.04 C
1912
9.5 C
-0.92 C
1913
11.5 C
+1.13 C
1914
10.8 C
+0.42 C
1915
10.1 C
-0.27 C
1916
9.9 C
-0.49 C
1917
8.6 C
-1.77 C
1919
10.3 C
-0.11 C
1920
10.2 C
-0.17 C
1921
12.6 C
+2.21 C
1922
11.7 C
+1.27 C
1923
10.9 C
+0.53 C
1924
9.5 C
-0.86 C
1925
10.6 C
+0.23 C
1929
9.0 C
-1.36 C
1930
10.9 C
+0.47 C
1931
12.1 C
+1.72 C
1932
9.8 C
-0.55 C
1933
11.3 C
+0.93 C
1934
11.8 C
+1.38 C
1935
10.4 C
+0.02 C
1936
11.0 C
+0.63 C
1937
9.7 C
-0.66 C
1939
11.8 C
+1.40 C
1940
9.7 C
-0.70 C
1941
11.4 C
+1.03 C
1942
10.1 C
-0.27 C
1943
9.9 C
-0.46 C
1944
10.2 C
-0.16 C
1945
9.5 C
-0.88 C
1947
10.4 C
+0.02 C
1948
10.4 C
+0.04 C
The fitted trend in annual mean temperature here over 1894 to 1948 is 0.1 C (-0.1 to 0.2) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.2 F (-0.1 to 0.4) per decade. The slope is a straight line fitted to 48 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Millerton
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.1 C (-0.1 to 0.2) per decade
0.2 F (-0.1 to 0.4) per decade
1894 to 1948
48
Not clearly different from zero
Mean daily maximum
-0.05 C (-0.22 to 0.13) per decade
-0.1 F (-0.4 to 0.2) per decade
1894 to 1948
48
Not clearly different from zero
Mean daily minimum
0.2 C (0.1 to 0.4) per decade
0.4 F (0.1 to 0.7) per decade
1894 to 1948
48
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 1951
Yearly extremes at Millerton: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
45.0 C (113.0 F)
1936
37.2 C (99.0 F)
59
Coldest night (TNn)
-35.0 C (-31.0 F)
1905
-26.1 C (-15.0 F)
59
Wettest day (Rx1day)
205.7 mm (8.1 in)
1903
62.0 mm (2.4 in)
59
Wettest five days (Rx5day)
215.9 mm (8.5 in)
1903
99.3 mm (3.9 in)
59
Longest dry spell (CDD)
39 days
1904
23 days
59
Hottest day (TXx)
The hottest day of the year at Millerton, 1893 to 1951. The record is 45.0 C (113.0 F) in 1936, marked on the chart; the median year is 37.2 C (99.0 F).
Hottest day (TXx) at Millerton by year
Year
Hottest day (TXx)
1893
35.6 C (96.1 F)
1894
41.7 C (107.1 F)
1895
36.7 C (98.1 F)
1896
35.0 C (95.0 F)
1897
38.9 C (102.0 F)
1898
36.7 C (98.1 F)
1899
37.8 C (100.0 F)
1900
35.6 C (96.1 F)
1901
44.4 C (111.9 F)
1902
33.3 C (91.9 F)
1903
35.0 C (95.0 F)
1904
33.9 C (93.0 F)
1905
35.6 C (96.1 F)
1906
36.1 C (97.0 F)
1907
35.0 C (95.0 F)
1908
35.6 C (96.1 F)
1909
36.7 C (98.1 F)
1910
37.2 C (99.0 F)
1911
42.2 C (108.0 F)
1912
38.3 C (100.9 F)
1913
41.1 C (106.0 F)
1914
38.9 C (102.0 F)
1915
34.4 C (93.9 F)
1916
39.4 C (102.9 F)
1917
39.4 C (102.9 F)
1918
42.8 C (109.0 F)
1919
37.8 C (100.0 F)
1920
36.1 C (97.0 F)
1921
36.7 C (98.1 F)
1922
38.3 C (100.9 F)
1923
37.2 C (99.0 F)
1924
35.6 C (96.1 F)
1925
37.2 C (99.0 F)
1926
37.8 C (100.0 F)
1927
37.2 C (99.0 F)
1928
33.3 C (91.9 F)
1929
35.6 C (96.1 F)
1930
41.7 C (107.1 F)
1931
37.8 C (100.0 F)
1932
35.6 C (96.1 F)
1933
37.2 C (99.0 F)
1934
43.3 C (109.9 F)
1935
37.2 C (99.0 F)
1936
45.0 C (113.0 F)
1937
36.7 C (98.1 F)
1938
37.8 C (100.0 F)
1939
37.8 C (100.0 F)
1940
40.0 C (104.0 F)
1941
38.9 C (102.0 F)
1942
34.4 C (93.9 F)
1943
35.6 C (96.1 F)
1944
35.0 C (95.0 F)
1945
35.6 C (96.1 F)
1946
33.9 C (93.0 F)
1947
38.9 C (102.0 F)
1948
38.3 C (100.9 F)
1949
34.4 C (93.9 F)
1950
32.8 C (91.0 F)
1951
18.3 C (64.9 F)
Coldest night (TNn)
The coldest night of the year at Millerton, 1893 to 1951. The record is -35.0 C (-31.0 F) in 1905, marked on the chart; the median year is -26.1 C (-15.0 F).
Coldest night (TNn) at Millerton by year
Year
Coldest night (TNn)
1893
-21.1 C (-6.0 F)
1894
-31.7 C (-25.1 F)
1895
-28.3 C (-18.9 F)
1896
-22.2 C (-8.0 F)
1897
-26.1 C (-15.0 F)
1898
-23.9 C (-11.0 F)
1899
-31.7 C (-25.1 F)
1900
-23.3 C (-9.9 F)
1901
-27.8 C (-18.0 F)
1902
-28.9 C (-20.0 F)
1903
-26.1 C (-15.0 F)
1904
-30.6 C (-23.1 F)
1905
-35.0 C (-31.0 F)
1906
-22.2 C (-8.0 F)
1907
-26.1 C (-15.0 F)
1908
-22.2 C (-8.0 F)
1909
-25.6 C (-14.1 F)
1910
-28.3 C (-18.9 F)
1911
-25.6 C (-14.1 F)
1912
-34.4 C (-29.9 F)
1913
-25.6 C (-14.1 F)
1914
-26.1 C (-15.0 F)
1915
-30.0 C (-22.0 F)
1916
-30.0 C (-22.0 F)
1917
-30.0 C (-22.0 F)
1918
-31.1 C (-24.0 F)
1919
-28.9 C (-20.0 F)
1920
-22.2 C (-8.0 F)
1921
-20.6 C (-5.1 F)
1922
-20.6 C (-5.1 F)
1923
-22.8 C (-9.0 F)
1924
-31.1 C (-24.0 F)
1925
-23.3 C (-9.9 F)
1926
-25.0 C (-13.0 F)
1927
-25.6 C (-14.1 F)
1928
-18.9 C (-2.0 F)
1929
-27.2 C (-17.0 F)
1930
-30.6 C (-23.1 F)
1931
-18.3 C (-0.9 F)
1932
-27.8 C (-18.0 F)
1933
-27.8 C (-18.0 F)
1934
-27.8 C (-18.0 F)
1935
-24.4 C (-11.9 F)
1936
-31.1 C (-24.0 F)
1937
-20.6 C (-5.1 F)
1938
-22.2 C (-8.0 F)
1939
-22.2 C (-8.0 F)
1940
-28.9 C (-20.0 F)
1941
-18.3 C (-0.9 F)
1942
-28.3 C (-18.9 F)
1943
-30.6 C (-23.1 F)
1944
-26.7 C (-16.1 F)
1945
-23.9 C (-11.0 F)
1946
-22.8 C (-9.0 F)
1947
-27.8 C (-18.0 F)
1948
-24.4 C (-11.9 F)
1949
-24.4 C (-11.9 F)
1950
-23.9 C (-11.0 F)
1951
-26.7 C (-16.1 F)
Wettest day (Rx1day)
The wettest day of the year at Millerton, 1893 to 1951. The record is 205.7 mm (8.1 in) in 1903, marked on the chart; the median year is 62.0 mm (2.4 in).
Wettest day (Rx1day) at Millerton by year
Year
Wettest day (Rx1day)
1893
40.6 mm (1.6 in)
1894
46.0 mm (1.8 in)
1895
67.3 mm (2.6 in)
1896
77.7 mm (3.1 in)
1897
82.3 mm (3.2 in)
1898
118.6 mm (4.7 in)
1899
54.6 mm (2.1 in)
1900
49.5 mm (1.9 in)
1901
49.5 mm (1.9 in)
1902
132.8 mm (5.2 in)
1903
205.7 mm (8.1 in)
1904
49.8 mm (2.0 in)
1905
90.4 mm (3.6 in)
1906
81.3 mm (3.2 in)
1907
42.4 mm (1.7 in)
1908
50.8 mm (2.0 in)
1909
71.6 mm (2.8 in)
1910
38.1 mm (1.5 in)
1911
71.6 mm (2.8 in)
1912
84.3 mm (3.3 in)
1913
71.9 mm (2.8 in)
1914
56.4 mm (2.2 in)
1915
72.6 mm (2.9 in)
1916
79.2 mm (3.1 in)
1917
50.8 mm (2.0 in)
1918
59.2 mm (2.3 in)
1919
121.4 mm (4.8 in)
1920
62.2 mm (2.4 in)
1921
44.7 mm (1.8 in)
1922
71.1 mm (2.8 in)
1923
38.9 mm (1.5 in)
1924
40.1 mm (1.6 in)
1925
62.0 mm (2.4 in)
1926
142.0 mm (5.6 in)
1927
42.7 mm (1.7 in)
1928
88.4 mm (3.5 in)
1929
58.9 mm (2.3 in)
1930
42.4 mm (1.7 in)
1931
54.6 mm (2.1 in)
1932
45.7 mm (1.8 in)
1933
69.9 mm (2.8 in)
1934
59.4 mm (2.3 in)
1935
83.6 mm (3.3 in)
1936
50.8 mm (2.0 in)
1937
56.4 mm (2.2 in)
1938
58.9 mm (2.3 in)
1939
61.0 mm (2.4 in)
1940
40.6 mm (1.6 in)
1941
56.1 mm (2.2 in)
1942
93.0 mm (3.7 in)
1943
72.4 mm (2.9 in)
1944
94.7 mm (3.7 in)
1945
74.2 mm (2.9 in)
1946
146.8 mm (5.8 in)
1947
82.8 mm (3.3 in)
1948
36.8 mm (1.4 in)
1949
62.7 mm (2.5 in)
1950
104.9 mm (4.1 in)
1951
19.6 mm (0.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Millerton, 1893 to 1951. The record is 215.9 mm (8.5 in) in 1903, marked on the chart; the median year is 99.3 mm (3.9 in).
Wettest five days (Rx5day) at Millerton by year
Year
Wettest five days (Rx5day)
1893
61.5 mm (2.4 in)
1894
63.3 mm (2.5 in)
1895
72.8 mm (2.9 in)
1896
118.6 mm (4.7 in)
1897
152.2 mm (6.0 in)
1898
133.0 mm (5.2 in)
1899
99.3 mm (3.9 in)
1900
83.4 mm (3.3 in)
1901
75.7 mm (3.0 in)
1902
167.1 mm (6.6 in)
1903
215.9 mm (8.5 in)
1904
64.8 mm (2.6 in)
1905
128.2 mm (5.0 in)
1906
82.8 mm (3.3 in)
1907
65.8 mm (2.6 in)
1908
109.5 mm (4.3 in)
1909
157.0 mm (6.2 in)
1910
45.2 mm (1.8 in)
1911
108.5 mm (4.3 in)
1912
104.2 mm (4.1 in)
1913
96.3 mm (3.8 in)
1914
104.7 mm (4.1 in)
1915
154.4 mm (6.1 in)
1916
105.5 mm (4.2 in)
1917
154.1 mm (6.1 in)
1918
103.1 mm (4.1 in)
1919
209.0 mm (8.2 in)
1920
92.5 mm (3.6 in)
1921
76.9 mm (3.0 in)
1922
92.8 mm (3.7 in)
1923
58.4 mm (2.3 in)
1924
65.6 mm (2.6 in)
1925
104.2 mm (4.1 in)
1926
204.2 mm (8.0 in)
1927
68.6 mm (2.7 in)
1928
179.5 mm (7.1 in)
1929
81.2 mm (3.2 in)
1930
57.1 mm (2.2 in)
1931
118.3 mm (4.7 in)
1932
81.5 mm (3.2 in)
1933
82.9 mm (3.3 in)
1934
108.5 mm (4.3 in)
1935
125.7 mm (4.9 in)
1936
61.2 mm (2.4 in)
1937
69.9 mm (2.8 in)
1938
91.4 mm (3.6 in)
1939
110.0 mm (4.3 in)
1940
60.5 mm (2.4 in)
1941
94.7 mm (3.7 in)
1942
100.1 mm (3.9 in)
1943
94.7 mm (3.7 in)
1944
105.9 mm (4.2 in)
1945
109.2 mm (4.3 in)
1946
175.5 mm (6.9 in)
1947
39.1 mm (1.5 in)
1948
65.6 mm (2.6 in)
1949
100.8 mm (4.0 in)
1950
150.9 mm (5.9 in)
1951
24.9 mm (1.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Millerton, 1893 to 1951. The record is 39 days in 1904, marked on the chart; the median year is 23 days.
Longest dry spell (CDD) at Millerton by year
Year
Longest dry spell (CDD)
1893
26 days
1894
21 days
1895
29 days
1896
21 days
1897
23 days
1898
17 days
1899
23 days
1900
18 days
1901
31 days
1902
20 days
1903
19 days
1904
39 days
1905
22 days
1906
34 days
1907
39 days
1908
25 days
1909
16 days
1910
37 days
1911
18 days
1912
29 days
1913
30 days
1914
23 days
1915
21 days
1916
27 days
1917
36 days
1918
19 days
1919
32 days
1920
26 days
1921
19 days
1922
19 days
1923
18 days
1924
20 days
1925
26 days
1926
27 days
1927
18 days
1928
18 days
1929
18 days
1930
19 days
1931
31 days
1932
23 days
1933
29 days
1934
36 days
1935
18 days
1936
23 days
1937
34 days
1938
24 days
1939
21 days
1940
25 days
1941
24 days
1942
31 days
1943
27 days
1944
27 days
1945
24 days
1946
21 days
1947
20 days
1948
19 days
1949
26 days
1950
23 days
1951
16 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
48 years with a frost
Across 48 years with a frost, the median last spring frost at Millerton falls on 28 April and the median first autumn frost on 10 October, which leaves a median of 163 days between them.
Fitted over all years, the growing season changes by +2.7 days per decade at this station.
Frost dates and growing season at Millerton
Measure
Median, all years
Earliest period
Recent period (1913 to 1948)
Recent against earliest
Fitted trend
Last spring frost
28 April
n/a
28 April
n/a
-0.3 days per decade
First autumn frost
10 October
n/a
11 October
n/a
+2.5 days per decade
Growing days
163 days
n/a
164 days
n/a
+2.7 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
52 years, 1894 to 1949
A day with at least 61.3 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 192.1 mm (7.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Millerton: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
61.3 mm (2.4 in)
5 years
84.1 mm (3.3 in)
10 years
103.2 mm (4.1 in)
25 years
133.0 mm (5.2 in)
50 years
160.1 mm (6.3 in)
100 years
192.1 mm (7.6 in)
Longer than the 52 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, 52 years of values from 1894 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: 205.7 mm (8.1 in) in 1903; 142.0 mm (5.6 in) in 1926; 132.8 mm (5.2 in) in 1902.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Millerton standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Millerton 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.