Record envelope, standing records and threshold days for Bonaparte 5 NE (USC00130793), Iowa, United States, with 47 years of record.
Key Facts for Bonaparte 5 NE
Bonaparte 5 NE (USC00130793) is a weather station in Iowa, United States at 40.77 latitude and -91.77 longitude, 174 m (571 ft) above sea level.
The station reports from 1893 to 1939, 47 years of record.
1,464 records set at Bonaparte 5 NE still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Bonaparte 5 NE set a daily record high maximum temperature of 27.8 C (82.0 F) on 22 March 1939.
About the Station
Location: Iowa, United States, 40.77 latitude, -91.77 longitude.
Elevation: 174 m (571 ft).
Period of record: 1893 to 1939, 47 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 Bonaparte 5 NE. 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 Bonaparte 5 NE, 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)
-32.8 C (-27.0 F)
n/a
n/a
Feb
24.4 C (75.9 F)
-35.0 C (-31.0 F)
n/a
n/a
Mar
31.1 C (88.0 F)
-23.9 C (-11.0 F)
n/a
n/a
Apr
32.8 C (91.0 F)
-13.3 C (8.1 F)
n/a
n/a
May
38.3 C (100.9 F)
-3.9 C (25.0 F)
n/a
n/a
Jun
40.0 C (104.0 F)
2.8 C (37.0 F)
n/a
n/a
Jul
45.6 C (114.1 F)
7.2 C (45.0 F)
n/a
n/a
Aug
43.9 C (111.0 F)
2.8 C (37.0 F)
n/a
n/a
Sep
39.4 C (102.9 F)
-3.3 C (26.1 F)
n/a
n/a
Oct
35.6 C (96.1 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
18.9 C (66.0 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 Bonaparte 5 NE still stand. 1936 holds the most, with 73.
Standing records at Bonaparte 5 NE by the year they were set
Year set
Standing records
1893
27
1894
62
1895
45
1896
30
1897
47
1898
20
1899
41
1900
20
1901
35
1902
42
1903
26
1904
23
1905
24
1906
25
1907
30
1908
21
1909
37
1910
35
1911
31
1912
41
1913
43
1914
31
1915
35
1916
33
1917
31
1918
36
1919
12
1920
24
1921
27
1922
21
1923
21
1924
31
1925
36
1926
23
1927
22
1928
29
1929
24
1930
43
1931
31
1932
33
1933
31
1934
44
1935
18
1936
73
1937
25
1938
19
1939
6
All-Time Record Progression
2 new records
2 all-time records were set at Bonaparte 5 NE between 9 July 1923 and 15 July 1936. Each dot is a new record.
When Bonaparte 5 NE set new all-time records
Date
Kind
Detail
1923-07-09
Record high minimum temperature
Record high minimum temperature 28.3 C (82.9 F)
1936-07-15
Record high maximum temperature
Record high maximum temperature 45.6 C (114.1 F)
Wettest Day of Each Month
Jun: 307.3 mm (12.1 in)
The wettest day on record for each calendar month at Bonaparte 5 NE. The most was 307.3 mm (12.1 in) on 10 June 1905.
Record daily precipitation for each month at Bonaparte 5 NE
Month
Record daily precipitation (mm)
Date
Jan
74.2 mm (2.9 in)
3 January 1897
Feb
32.5 mm (1.3 in)
1 February 1903
Mar
49.5 mm (1.9 in)
11 March 1939
Apr
54.6 mm (2.1 in)
20 April 1905
May
91.9 mm (3.6 in)
28 May 1908
Jun
307.3 mm (12.1 in)
10 June 1905
Jul
136.9 mm (5.4 in)
3 July 1931
Aug
121.2 mm (4.8 in)
27 August 1903
Sep
129.5 mm (5.1 in)
12 September 1928
Oct
62.2 mm (2.4 in)
10 October 1936
Nov
65.3 mm (2.6 in)
3 November 1934
Dec
40.6 mm (1.6 in)
30 December 1906
Period of Record Coverage
1893 to 1939
Complete yearUnder 90 percent of days
47 years of record at Bonaparte 5 NE, 1893 to 1939. 4 years have data for under 90 percent of days and are left out of rankings: 1896, 1912, 1920, 1939.
Cooler than the station meanWarmer than the station mean
One stripe for each of 39 complete years at Bonaparte 5 NE, 1893 to 1938. Blue stripes are years cooler than the station's own mean of 10.5 C (50.9 F); red stripes are warmer. The coolest year was 1917, at 8.8 C (47.9 F), and the warmest was 1931, at 12.4 C (54.4 F). The strongest colour marks a difference of 2.0 C (3.6 F).
Annual mean temperature at Bonaparte 5 NE as warming stripes, 1893 to 1938
Year
Annual mean temperature
Difference from the station mean
1893
9.2 C
-1.35 C
1894
11.4 C
+0.88 C
1895
9.9 C
-0.65 C
1898
10.1 C
-0.47 C
1899
10.4 C
-0.15 C
1900
11.1 C
+0.62 C
1902
10.0 C
-0.53 C
1903
9.7 C
-0.80 C
1904
8.9 C
-1.63 C
1907
10.2 C
-0.33 C
1908
10.9 C
+0.35 C
1909
10.2 C
-0.35 C
1910
10.5 C
-0.07 C
1911
11.3 C
+0.74 C
1913
11.5 C
+0.96 C
1914
11.0 C
+0.46 C
1915
10.2 C
-0.31 C
1916
10.1 C
-0.44 C
1917
8.8 C
-1.69 C
1918
10.7 C
+0.18 C
1919
10.6 C
+0.06 C
1921
12.4 C
+1.90 C
1922
11.4 C
+0.86 C
1923
10.9 C
+0.33 C
1924
9.3 C
-1.18 C
1925
10.2 C
-0.30 C
1926
10.1 C
-0.45 C
1927
10.6 C
+0.07 C
1928
10.5 C
-0.02 C
1929
9.1 C
-1.41 C
1930
11.0 C
+0.49 C
1931
12.4 C
+1.92 C
1932
10.5 C
-0.02 C
1933
11.6 C
+1.11 C
1934
11.8 C
+1.27 C
1935
10.2 C
-0.32 C
1936
10.8 C
+0.29 C
1937
9.5 C
-1.01 C
1938
11.7 C
+1.18 C
The fitted trend in annual mean temperature here over 1893 to 1938 is 0.18 C (-0.03 to 0.39) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.3 F (-0.1 to 0.7) per decade. The slope is a straight line fitted to 39 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Bonaparte 5 NE
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.18 C (-0.03 to 0.39) per decade
0.3 F (-0.1 to 0.7) per decade
1893 to 1938
39
Not clearly different from zero
Mean daily maximum
0.03 C (-0.21 to 0.28) per decade
0.1 F (-0.4 to 0.5) per decade
1893 to 1938
39
Not clearly different from zero
Mean daily minimum
0.3 C (0.1 to 0.5) per decade
0.6 F (0.2 to 1.0) per decade
1893 to 1938
39
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 1939
Yearly extremes at Bonaparte 5 NE: 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
37.2 C (99.0 F)
47
Coldest night (TNn)
-35.0 C (-31.0 F)
1905
-26.1 C (-15.0 F)
47
Wettest day (Rx1day)
307.3 mm (12.1 in)
1905
65.3 mm (2.6 in)
47
Wettest five days (Rx5day)
307.3 mm (12.1 in)
1905
102.4 mm (4.0 in)
47
Longest dry spell (CDD)
45 days
1899
24 days
47
Hottest day (TXx)
The hottest day of the year at Bonaparte 5 NE, 1893 to 1939. The record is 45.6 C (114.1 F) in 1936, marked on the chart; the median year is 37.2 C (99.0 F).
Hottest day (TXx) at Bonaparte 5 NE by year
Year
Hottest day (TXx)
1893
38.3 C (100.9 F)
1894
41.7 C (107.1 F)
1895
38.3 C (100.9 F)
1896
37.8 C (100.0 F)
1897
38.9 C (102.0 F)
1898
36.1 C (97.0 F)
1899
39.4 C (102.9 F)
1900
37.8 C (100.0 F)
1901
44.4 C (111.9 F)
1902
34.4 C (93.9 F)
1903
35.6 C (96.1 F)
1904
33.9 C (93.0 F)
1905
35.6 C (96.1 F)
1906
36.7 C (98.1 F)
1907
33.3 C (91.9 F)
1908
35.0 C (95.0 F)
1909
36.7 C (98.1 F)
1910
37.8 C (100.0 F)
1911
41.1 C (106.0 F)
1912
37.8 C (100.0 F)
1913
41.1 C (106.0 F)
1914
40.0 C (104.0 F)
1915
35.0 C (95.0 F)
1916
38.3 C (100.9 F)
1917
37.2 C (99.0 F)
1918
40.6 C (105.1 F)
1919
37.2 C (99.0 F)
1920
34.4 C (93.9 F)
1921
37.2 C (99.0 F)
1922
36.1 C (97.0 F)
1923
37.2 C (99.0 F)
1924
34.4 C (93.9 F)
1925
36.7 C (98.1 F)
1926
34.4 C (93.9 F)
1927
36.1 C (97.0 F)
1928
32.8 C (91.0 F)
1929
35.6 C (96.1 F)
1930
42.2 C (108.0 F)
1931
37.8 C (100.0 F)
1932
35.0 C (95.0 F)
1933
37.2 C (99.0 F)
1934
43.9 C (111.0 F)
1935
36.7 C (98.1 F)
1936
45.6 C (114.1 F)
1937
37.2 C (99.0 F)
1938
36.7 C (98.1 F)
1939
28.3 C (82.9 F)
Coldest night (TNn)
The coldest night of the year at Bonaparte 5 NE, 1893 to 1939. 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 Bonaparte 5 NE by year
Year
Coldest night (TNn)
1893
-25.6 C (-14.1 F)
1894
-27.8 C (-18.0 F)
1895
-28.9 C (-20.0 F)
1896
-22.2 C (-8.0 F)
1897
-26.7 C (-16.1 F)
1898
-23.9 C (-11.0 F)
1899
-30.6 C (-23.1 F)
1900
-22.2 C (-8.0 F)
1901
-26.1 C (-15.0 F)
1902
-26.7 C (-16.1 F)
1903
-27.2 C (-17.0 F)
1904
-29.4 C (-20.9 F)
1905
-35.0 C (-31.0 F)
1906
-20.0 C (-4.0 F)
1907
-23.9 C (-11.0 F)
1908
-22.2 C (-8.0 F)
1909
-26.1 C (-15.0 F)
1910
-27.2 C (-17.0 F)
1911
-25.0 C (-13.0 F)
1912
-32.8 C (-27.0 F)
1913
-23.9 C (-11.0 F)
1914
-31.1 C (-24.0 F)
1915
-29.4 C (-20.9 F)
1916
-28.3 C (-18.9 F)
1917
-28.3 C (-18.9 F)
1918
-29.4 C (-20.9 F)
1919
-29.4 C (-20.9 F)
1920
-25.0 C (-13.0 F)
1921
-23.3 C (-9.9 F)
1922
-21.1 C (-6.0 F)
1923
-23.3 C (-9.9 F)
1924
-31.1 C (-24.0 F)
1925
-23.3 C (-9.9 F)
1926
-24.4 C (-11.9 F)
1927
-29.4 C (-20.9 F)
1928
-23.3 C (-9.9 F)
1929
-26.1 C (-15.0 F)
1930
-31.1 C (-24.0 F)
1931
-17.2 C (1.0 F)
1932
-27.8 C (-18.0 F)
1933
-33.3 C (-27.9 F)
1934
-27.2 C (-17.0 F)
1935
-23.3 C (-9.9 F)
1936
-29.4 C (-20.9 F)
1937
-20.0 C (-4.0 F)
1938
-20.6 C (-5.1 F)
1939
-17.8 C (0.0 F)
Wettest day (Rx1day)
The wettest day of the year at Bonaparte 5 NE, 1893 to 1939. The record is 307.3 mm (12.1 in) in 1905, marked on the chart; the median year is 65.3 mm (2.6 in).
Wettest day (Rx1day) at Bonaparte 5 NE by year
Year
Wettest day (Rx1day)
1893
50.8 mm (2.0 in)
1894
66.8 mm (2.6 in)
1895
57.9 mm (2.3 in)
1896
67.6 mm (2.7 in)
1897
74.2 mm (2.9 in)
1898
67.6 mm (2.7 in)
1899
45.7 mm (1.8 in)
1900
79.0 mm (3.1 in)
1901
44.5 mm (1.8 in)
1902
52.8 mm (2.1 in)
1903
121.2 mm (4.8 in)
1904
50.8 mm (2.0 in)
1905
307.3 mm (12.1 in)
1906
40.6 mm (1.6 in)
1907
81.3 mm (3.2 in)
1908
91.9 mm (3.6 in)
1909
77.0 mm (3.0 in)
1910
44.5 mm (1.8 in)
1911
69.9 mm (2.8 in)
1912
40.6 mm (1.6 in)
1913
61.0 mm (2.4 in)
1914
63.5 mm (2.5 in)
1915
48.3 mm (1.9 in)
1916
83.8 mm (3.3 in)
1917
83.1 mm (3.3 in)
1918
69.6 mm (2.7 in)
1919
68.6 mm (2.7 in)
1920
62.2 mm (2.4 in)
1921
53.6 mm (2.1 in)
1922
53.3 mm (2.1 in)
1923
36.8 mm (1.4 in)
1924
53.3 mm (2.1 in)
1925
86.4 mm (3.4 in)
1926
61.7 mm (2.4 in)
1927
77.5 mm (3.1 in)
1928
129.5 mm (5.1 in)
1929
87.9 mm (3.5 in)
1930
112.8 mm (4.4 in)
1931
136.9 mm (5.4 in)
1932
45.7 mm (1.8 in)
1933
113.0 mm (4.4 in)
1934
65.3 mm (2.6 in)
1935
53.6 mm (2.1 in)
1936
62.2 mm (2.4 in)
1937
40.6 mm (1.6 in)
1938
79.0 mm (3.1 in)
1939
49.5 mm (1.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Bonaparte 5 NE, 1893 to 1939. The record is 307.3 mm (12.1 in) in 1905, marked on the chart; the median year is 102.4 mm (4.0 in).
Wettest five days (Rx5day) at Bonaparte 5 NE by year
Year
Wettest five days (Rx5day)
1893
90.4 mm (3.6 in)
1894
102.4 mm (4.0 in)
1895
82.3 mm (3.2 in)
1896
133.2 mm (5.2 in)
1897
83.6 mm (3.3 in)
1898
129.0 mm (5.1 in)
1899
67.0 mm (2.6 in)
1900
93.0 mm (3.7 in)
1901
50.6 mm (2.0 in)
1902
118.1 mm (4.6 in)
1903
138.2 mm (5.4 in)
1904
77.5 mm (3.1 in)
1905
307.3 mm (12.1 in)
1906
81.2 mm (3.2 in)
1907
127.0 mm (5.0 in)
1908
115.3 mm (4.5 in)
1909
155.2 mm (6.1 in)
1910
54.8 mm (2.2 in)
1911
150.4 mm (5.9 in)
1912
62.7 mm (2.5 in)
1913
88.5 mm (3.5 in)
1914
84.3 mm (3.3 in)
1915
100.1 mm (3.9 in)
1916
112.5 mm (4.4 in)
1917
130.3 mm (5.1 in)
1918
103.6 mm (4.1 in)
1919
89.6 mm (3.5 in)
1920
90.2 mm (3.6 in)
1921
65.2 mm (2.6 in)
1922
104.8 mm (4.1 in)
1923
71.9 mm (2.8 in)
1924
118.3 mm (4.7 in)
1925
134.4 mm (5.3 in)
1926
105.8 mm (4.2 in)
1927
104.3 mm (4.1 in)
1928
170.4 mm (6.7 in)
1929
108.5 mm (4.3 in)
1930
139.8 mm (5.5 in)
1931
136.9 mm (5.4 in)
1932
78.6 mm (3.1 in)
1933
152.4 mm (6.0 in)
1934
97.2 mm (3.8 in)
1935
98.6 mm (3.9 in)
1936
114.5 mm (4.5 in)
1937
50.5 mm (2.0 in)
1938
84.6 mm (3.3 in)
1939
87.1 mm (3.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Bonaparte 5 NE, 1893 to 1939. The record is 45 days in 1899, marked on the chart; the median year is 24 days.
Longest dry spell (CDD) at Bonaparte 5 NE by year
Year
Longest dry spell (CDD)
1893
35 days
1894
21 days
1895
30 days
1896
21 days
1897
24 days
1898
20 days
1899
45 days
1900
37 days
1901
24 days
1902
28 days
1903
28 days
1904
31 days
1905
21 days
1906
25 days
1907
24 days
1908
25 days
1909
17 days
1910
27 days
1911
18 days
1912
39 days
1913
23 days
1914
43 days
1915
25 days
1916
22 days
1917
32 days
1918
29 days
1919
35 days
1920
27 days
1921
18 days
1922
27 days
1923
23 days
1924
22 days
1925
22 days
1926
23 days
1927
21 days
1928
31 days
1929
15 days
1930
27 days
1931
34 days
1932
23 days
1933
38 days
1934
24 days
1935
16 days
1936
23 days
1937
20 days
1938
29 days
1939
12 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
39 years with a frost
Across 39 years with a frost, the median last spring frost at Bonaparte 5 NE falls on 25 April and the median first autumn frost on 11 October, which leaves a median of 168 days between them.
Fitted over all years, the growing season changes by +1.4 days per decade at this station.
Frost dates and growing season at Bonaparte 5 NE
Measure
Median, all years
Earliest period
Recent period (1907 to 1938)
Recent against earliest
Fitted trend
Last spring frost
25 April
n/a
27 April
n/a
+0.6 days per decade
First autumn frost
11 October
n/a
12 October
n/a
+2.0 days per decade
Growing days
168 days
n/a
164 days
n/a
+1.4 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
37 years, 1893 to 1938
A day with at least 62.5 mm (2.5 in) of rain is expected about once in 2 years. A day with at least 252.4 mm (9.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Bonaparte 5 NE: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
62.5 mm (2.5 in)
5 years
88.8 mm (3.5 in)
10 years
113.3 mm (4.5 in)
25 years
155.6 mm (6.1 in)
50 years
198.0 mm (7.8 in)
Longer than the 37 years of record
100 years
252.4 mm (9.9 in)
Longer than the 37 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, 37 years of values from 1893 to 1938.
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: 307.3 mm (12.1 in) in 1905; 136.9 mm (5.4 in) in 1931; 121.2 mm (4.8 in) in 1903.
Download the Data
Data for Bonaparte 5 NE standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Bonaparte 5 NE 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.