Record envelope, standing records and threshold days for Olin (USC00136225), Iowa, United States, with 44 years of record.
Key Facts for Olin
Olin (USC00136225) is a weather station in Iowa, United States at 42.00 latitude and -91.13 longitude, 229 m (751 ft) above sea level.
The station reports from 1898 to 1941, 44 years of record.
1,464 records set at Olin still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Olin set a daily record low maximum temperature of 18.9 C (66.0 F) on 10 June 1941.
About the Station
Location: Iowa, United States, 42.00 latitude, -91.13 longitude.
Elevation: 229 m (751 ft).
Period of record: 1898 to 1941, 44 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 Olin. 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 Olin, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
14.4 C (57.9 F)
-37.2 C (-35.0 F)
n/a
n/a
Feb
19.4 C (66.9 F)
-35.6 C (-32.1 F)
n/a
n/a
Mar
27.8 C (82.0 F)
-28.3 C (-18.9 F)
n/a
n/a
Apr
33.9 C (93.0 F)
-17.2 C (1.0 F)
n/a
n/a
May
41.1 C (106.0 F)
-4.4 C (24.1 F)
n/a
n/a
Jun
40.6 C (105.1 F)
0.0 C (32.0 F)
n/a
n/a
Jul
43.9 C (111.0 F)
5.0 C (41.0 F)
n/a
n/a
Aug
41.7 C (107.1 F)
2.2 C (36.0 F)
n/a
n/a
Sep
38.9 C (102.0 F)
-8.3 C (17.1 F)
n/a
n/a
Oct
32.2 C (90.0 F)
-17.8 C (0.0 F)
n/a
n/a
Nov
25.6 C (78.1 F)
-22.2 C (-8.0 F)
n/a
n/a
Dec
16.7 C (62.1 F)
-33.3 C (-27.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Olin still stand. 1930 holds the most, with 63.
Standing records at Olin by the year they were set
Year set
Standing records
1898
31
1899
51
1900
12
1901
35
1902
48
1903
38
1904
26
1905
31
1906
29
1907
32
1908
23
1909
14
1910
20
1911
40
1912
38
1913
58
1914
25
1915
32
1916
21
1917
33
1918
40
1919
25
1920
29
1921
41
1922
19
1923
21
1924
31
1925
35
1926
29
1927
30
1928
39
1929
37
1930
63
1931
47
1932
39
1933
30
1934
49
1935
32
1936
62
1937
29
1938
27
1939
31
1940
31
1941
11
All-Time Record Progression
6 new records
6 all-time records were set at Olin between 20 February 1929 and 14 July 1936. Each dot is a new record.
When Olin set new all-time records
Date
Kind
Detail
1929-02-20
Record low minimum temperature
Record low minimum temperature -35.6 C (-32.1 F)
1930-01-22
Record low minimum temperature
Record low minimum temperature -37.2 C (-35.0 F)
1934-07-05
Record daily precipitation
Record daily precipitation 141.0 mm (5.6 in)
1936-07-12
Record high maximum temperature
Record high maximum temperature 42.8 C (109.0 F)
1936-07-13
Record high maximum temperature
Record high maximum temperature 43.3 C (109.9 F)
1936-07-14
Record high maximum temperature
Record high maximum temperature 43.9 C (111.0 F)
Wettest Day of Each Month
Jul: 141.0 mm (5.6 in)
The wettest day on record for each calendar month at Olin. The most was 141.0 mm (5.6 in) on 5 July 1934.
Record daily precipitation for each month at Olin
Month
Record daily precipitation (mm)
Date
Jan
50.8 mm (2.0 in)
19 January 1907
Feb
50.8 mm (2.0 in)
5 February 1908
Mar
62.2 mm (2.4 in)
26 March 1916
Apr
50.8 mm (2.0 in)
28 April 1909
May
76.2 mm (3.0 in)
3 May 1919
Jun
115.6 mm (4.6 in)
12 June 1917
Jul
141.0 mm (5.6 in)
5 July 1934
Aug
120.7 mm (4.8 in)
19 August 1912
Sep
108.0 mm (4.3 in)
16 September 1921
Oct
77.5 mm (3.1 in)
31 October 1916
Nov
58.4 mm (2.3 in)
3 November 1935
Dec
50.8 mm (2.0 in)
11 December 1899
Period of Record Coverage
1898 to 1941
Complete yearUnder 90 percent of days
44 years of record at Olin, 1898 to 1941. 9 years have data for under 90 percent of days and are left out of rankings: 1898, 1900, 1908, 1909, 1910, 1911, 1916, 1922 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 31 complete years at Olin, 1899 to 1940. Blue stripes are years cooler than the station's own mean of 9.1 C (48.3 F); red stripes are warmer. The coolest year was 1917, at 7.4 C (45.3 F), and the warmest was 1931, at 11.4 C (52.6 F). The strongest colour marks a difference of 2.4 C (4.3 F).
Annual mean temperature at Olin as warming stripes, 1899 to 1940
Year
Annual mean temperature
Difference from the station mean
1899
8.5 C
-0.56 C
1901
8.8 C
-0.25 C
1902
8.3 C
-0.77 C
1903
8.4 C
-0.70 C
1904
7.9 C
-1.21 C
1905
8.4 C
-0.70 C
1906
9.2 C
+0.15 C
1907
8.7 C
-0.41 C
1912
8.1 C
-0.96 C
1914
9.7 C
+0.59 C
1915
8.9 C
-0.18 C
1917
7.4 C
-1.70 C
1918
9.5 C
+0.39 C
1920
8.8 C
-0.27 C
1921
11.1 C
+2.01 C
1923
9.1 C
+0.05 C
1924
7.7 C
-1.40 C
1925
8.9 C
-0.15 C
1926
8.7 C
-0.39 C
1927
9.7 C
+0.57 C
1928
9.6 C
+0.56 C
1929
7.8 C
-1.27 C
1930
9.4 C
+0.31 C
1931
11.4 C
+2.35 C
1932
9.1 C
+0.05 C
1933
9.8 C
+0.68 C
1934
10.3 C
+1.17 C
1935
8.8 C
-0.26 C
1938
10.6 C
+1.53 C
1939
10.1 C
+1.02 C
1940
8.7 C
-0.36 C
The annual mean temperature here has risen by 0.4 C (0.1 to 0.6) per decade over 1899 to 1940. In Fahrenheit: 0.6 F (0.2 to 1.1) per decade. The slope is a straight line fitted to 31 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Olin
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.4 C (0.1 to 0.6) per decade
0.6 F (0.2 to 1.1) per decade
1899 to 1940
31
Rise
Mean daily maximum
0.6 C (0.3 to 0.8) per decade
1.0 F (0.5 to 1.5) per decade
1899 to 1940
31
Rise
Mean daily minimum
0.1 C (-0.1 to 0.4) per decade
0.3 F (-0.3 to 0.8) per decade
1899 to 1940
31
Not clearly different from zero
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
1898 to 1941
Yearly extremes at Olin: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
43.9 C (111.0 F)
1936
36.7 C (98.1 F)
44
Coldest night (TNn)
-37.2 C (-35.0 F)
1930
-28.0 C (-18.5 F)
44
Wettest day (Rx1day)
141.0 mm (5.6 in)
1934
62.0 mm (2.4 in)
44
Wettest five days (Rx5day)
183.0 mm (7.2 in)
1921
82.6 mm (3.3 in)
44
Longest dry spell (CDD)
52 days
1904
26 days
44
Hottest day (TXx)
The hottest day of the year at Olin, 1898 to 1941. The record is 43.9 C (111.0 F) in 1936, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Olin by year
Year
Hottest day (TXx)
1898
36.1 C (97.0 F)
1899
35.6 C (96.1 F)
1900
31.1 C (88.0 F)
1901
39.4 C (102.9 F)
1902
32.2 C (90.0 F)
1903
33.3 C (91.9 F)
1904
34.4 C (93.9 F)
1905
34.4 C (93.9 F)
1906
32.8 C (91.0 F)
1907
32.8 C (91.0 F)
1908
36.7 C (98.1 F)
1909
33.3 C (91.9 F)
1910
38.3 C (100.9 F)
1911
41.7 C (107.1 F)
1912
36.1 C (97.0 F)
1913
37.8 C (100.0 F)
1914
36.1 C (97.0 F)
1915
31.7 C (89.1 F)
1916
40.6 C (105.1 F)
1917
38.3 C (100.9 F)
1918
40.0 C (104.0 F)
1919
37.2 C (99.0 F)
1920
36.1 C (97.0 F)
1921
38.3 C (100.9 F)
1922
36.7 C (98.1 F)
1923
36.7 C (98.1 F)
1924
33.9 C (93.0 F)
1925
37.2 C (99.0 F)
1926
36.7 C (98.1 F)
1927
37.8 C (100.0 F)
1928
35.6 C (96.1 F)
1929
36.1 C (97.0 F)
1930
41.7 C (107.1 F)
1931
40.0 C (104.0 F)
1932
37.8 C (100.0 F)
1933
37.8 C (100.0 F)
1934
41.1 C (106.0 F)
1935
37.8 C (100.0 F)
1936
43.9 C (111.0 F)
1937
37.8 C (100.0 F)
1938
35.6 C (96.1 F)
1939
38.3 C (100.9 F)
1940
41.7 C (107.1 F)
1941
35.0 C (95.0 F)
Coldest night (TNn)
The coldest night of the year at Olin, 1898 to 1941. The record is -37.2 C (-35.0 F) in 1930, marked on the chart; the median year is -28.0 C (-18.5 F).
Coldest night (TNn) at Olin by year
Year
Coldest night (TNn)
1898
-23.3 C (-9.9 F)
1899
-32.2 C (-26.0 F)
1900
-26.1 C (-15.0 F)
1901
-27.8 C (-18.0 F)
1902
-33.3 C (-27.9 F)
1903
-30.0 C (-22.0 F)
1904
-30.6 C (-23.1 F)
1905
-33.3 C (-27.9 F)
1906
-23.9 C (-11.0 F)
1907
-28.3 C (-18.9 F)
1908
-25.0 C (-13.0 F)
1909
-14.4 C (6.1 F)
1910
-22.8 C (-9.0 F)
1911
-25.6 C (-14.1 F)
1912
-31.7 C (-25.1 F)
1913
-24.4 C (-11.9 F)
1914
-31.1 C (-24.0 F)
1915
-32.2 C (-26.0 F)
1916
-31.1 C (-24.0 F)
1917
-30.0 C (-22.0 F)
1918
-32.8 C (-27.0 F)
1919
-33.3 C (-27.9 F)
1920
-25.6 C (-14.1 F)
1921
-27.2 C (-17.0 F)
1922
-28.3 C (-18.9 F)
1923
-28.3 C (-18.9 F)
1924
-32.2 C (-26.0 F)
1925
-25.6 C (-14.1 F)
1926
-25.6 C (-14.1 F)
1927
-28.3 C (-18.9 F)
1928
-24.4 C (-11.9 F)
1929
-35.6 C (-32.1 F)
1930
-37.2 C (-35.0 F)
1931
-25.0 C (-13.0 F)
1932
-27.8 C (-18.0 F)
1933
-32.8 C (-27.0 F)
1934
-25.0 C (-13.0 F)
1935
-25.0 C (-13.0 F)
1936
-32.8 C (-27.0 F)
1937
-21.1 C (-6.0 F)
1938
-24.4 C (-11.9 F)
1939
-27.2 C (-17.0 F)
1940
-29.4 C (-20.9 F)
1941
-23.3 C (-9.9 F)
Wettest day (Rx1day)
The wettest day of the year at Olin, 1898 to 1941. The record is 141.0 mm (5.6 in) in 1934, marked on the chart; the median year is 62.0 mm (2.4 in).
Wettest day (Rx1day) at Olin by year
Year
Wettest day (Rx1day)
1898
82.8 mm (3.3 in)
1899
69.6 mm (2.7 in)
1900
36.1 mm (1.4 in)
1901
55.9 mm (2.2 in)
1902
86.9 mm (3.4 in)
1903
56.9 mm (2.2 in)
1904
76.2 mm (3.0 in)
1905
78.7 mm (3.1 in)
1906
101.6 mm (4.0 in)
1907
70.6 mm (2.8 in)
1908
50.8 mm (2.0 in)
1909
50.8 mm (2.0 in)
1910
37.1 mm (1.5 in)
1911
62.5 mm (2.5 in)
1912
120.7 mm (4.8 in)
1913
52.1 mm (2.1 in)
1914
102.9 mm (4.1 in)
1915
50.8 mm (2.0 in)
1916
77.5 mm (3.1 in)
1917
115.6 mm (4.6 in)
1918
40.6 mm (1.6 in)
1919
76.2 mm (3.0 in)
1920
66.0 mm (2.6 in)
1921
108.0 mm (4.3 in)
1922
44.5 mm (1.8 in)
1923
61.7 mm (2.4 in)
1924
101.6 mm (4.0 in)
1925
61.0 mm (2.4 in)
1926
76.2 mm (3.0 in)
1927
92.7 mm (3.6 in)
1928
64.3 mm (2.5 in)
1929
47.5 mm (1.9 in)
1930
39.6 mm (1.6 in)
1931
52.3 mm (2.1 in)
1932
47.0 mm (1.9 in)
1933
63.5 mm (2.5 in)
1934
141.0 mm (5.6 in)
1935
58.4 mm (2.3 in)
1936
37.3 mm (1.5 in)
1937
40.6 mm (1.6 in)
1938
62.2 mm (2.4 in)
1939
45.7 mm (1.8 in)
1940
50.8 mm (2.0 in)
1941
47.5 mm (1.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Olin, 1898 to 1941. The record is 183.0 mm (7.2 in) in 1921, marked on the chart; the median year is 82.6 mm (3.3 in).
Wettest five days (Rx5day) at Olin by year
Year
Wettest five days (Rx5day)
1898
96.5 mm (3.8 in)
1899
103.9 mm (4.1 in)
1900
50.6 mm (2.0 in)
1901
62.5 mm (2.5 in)
1902
68.4 mm (2.7 in)
1903
112.7 mm (4.4 in)
1904
76.2 mm (3.0 in)
1905
110.5 mm (4.4 in)
1906
160.1 mm (6.3 in)
1907
114.9 mm (4.5 in)
1908
61.7 mm (2.4 in)
1909
71.1 mm (2.8 in)
1910
65.3 mm (2.6 in)
1911
94.3 mm (3.7 in)
1912
68.6 mm (2.7 in)
1913
75.0 mm (3.0 in)
1914
102.9 mm (4.1 in)
1915
97.8 mm (3.9 in)
1916
82.6 mm (3.3 in)
1917
139.7 mm (5.5 in)
1918
62.2 mm (2.4 in)
1919
138.4 mm (5.4 in)
1920
85.1 mm (3.4 in)
1921
183.0 mm (7.2 in)
1922
65.3 mm (2.6 in)
1923
61.7 mm (2.4 in)
1924
144.0 mm (5.7 in)
1925
83.5 mm (3.3 in)
1926
103.2 mm (4.1 in)
1927
160.0 mm (6.3 in)
1928
96.3 mm (3.8 in)
1929
56.4 mm (2.2 in)
1930
61.7 mm (2.4 in)
1931
92.5 mm (3.6 in)
1932
54.6 mm (2.1 in)
1933
71.1 mm (2.8 in)
1934
168.2 mm (6.6 in)
1935
77.4 mm (3.0 in)
1936
49.8 mm (2.0 in)
1937
52.0 mm (2.0 in)
1938
95.2 mm (3.7 in)
1939
82.6 mm (3.3 in)
1940
58.5 mm (2.3 in)
1941
68.4 mm (2.7 in)
Longest dry spell (CDD)
The longest dry spell of the year at Olin, 1898 to 1941. The record is 52 days in 1904, marked on the chart; the median year is 26 days.
Longest dry spell (CDD) at Olin by year
Year
Longest dry spell (CDD)
1898
17 days
1899
21 days
1900
24 days
1901
20 days
1902
22 days
1903
27 days
1904
52 days
1905
23 days
1906
24 days
1907
28 days
1908
26 days
1909
18 days
1910
17 days
1911
17 days
1912
17 days
1913
30 days
1914
33 days
1915
38 days
1916
48 days
1917
34 days
1918
27 days
1919
36 days
1920
25 days
1921
52 days
1922
19 days
1923
35 days
1924
20 days
1925
29 days
1926
24 days
1927
38 days
1928
20 days
1929
29 days
1930
39 days
1931
29 days
1932
21 days
1933
38 days
1934
36 days
1935
16 days
1936
27 days
1937
20 days
1938
23 days
1939
30 days
1940
20 days
1941
18 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
31 years with a frost
Across 31 years with a frost, the median last spring frost at Olin falls on 2 May and the median first autumn frost on 30 September, which leaves a median of 147 days between them.
Fitted over all years, the growing season changes by +0.8 days per decade at this station.
Frost dates and growing season at Olin
Measure
Median, all years
Earliest period
Recent period (1901 to 1940)
Recent against earliest
Fitted trend
Last spring frost
2 May
n/a
3 May
n/a
+0.5 days per decade
First autumn frost
30 September
n/a
30 September
n/a
+1.3 days per decade
Growing days
147 days
n/a
147 days
n/a
+0.8 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
33 years, 1899 to 1940
A day with at least 60.4 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 157.4 mm (6.2 in) of rain is expected about once in 100 years.
Rainfall return levels at Olin: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
60.4 mm (2.4 in)
5 years
80.8 mm (3.2 in)
10 years
96.2 mm (3.8 in)
25 years
118.4 mm (4.7 in)
50 years
137.0 mm (5.4 in)
Longer than the 33 years of record
100 years
157.4 mm (6.2 in)
Longer than the 33 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, 33 years of values from 1899 to 1940.
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: 141.0 mm (5.6 in) in 1934; 115.6 mm (4.6 in) in 1917; 108.0 mm (4.3 in) in 1921.
Download the Data
Data for Olin standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Olin 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.