Record envelope, standing records and threshold days for Waverly (USC00138771), Iowa, United States, with 51 years of record.
Key Facts for Waverly
Waverly (USC00138771) is a weather station in Iowa, United States at 42.73 latitude and -92.47 longitude, 287 m (942 ft) above sea level.
The station reports from 1896 to 1946, 51 years of record.
1,464 records set at Waverly still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Waverly tied a daily record low minimum temperature of 8.3 C (46.9 F) on 12 August 1946.
About the Station
Location: Iowa, United States, 42.73 latitude, -92.47 longitude.
Elevation: 287 m (942 ft).
Period of record: 1896 to 1946, 51 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 Waverly. 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 Waverly, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
15.0 C (59.0 F)
-36.7 C (-34.1 F)
n/a
n/a
Feb
17.2 C (63.0 F)
-36.1 C (-33.0 F)
n/a
n/a
Mar
28.9 C (84.0 F)
-27.2 C (-17.0 F)
n/a
n/a
Apr
33.3 C (91.9 F)
-15.0 C (5.0 F)
n/a
n/a
May
41.1 C (106.0 F)
-6.1 C (21.0 F)
n/a
n/a
Jun
41.1 C (106.0 F)
1.7 C (35.1 F)
n/a
n/a
Jul
42.8 C (109.0 F)
5.0 C (41.0 F)
n/a
n/a
Aug
40.6 C (105.1 F)
0.0 C (32.0 F)
n/a
n/a
Sep
38.9 C (102.0 F)
-6.1 C (21.0 F)
n/a
n/a
Oct
32.8 C (91.0 F)
-19.4 C (-2.9 F)
n/a
n/a
Nov
27.2 C (81.0 F)
-22.2 C (-8.0 F)
n/a
n/a
Dec
17.2 C (63.0 F)
-32.8 C (-27.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Waverly still stand. 1936 holds the most, with 62.
Standing records at Waverly by the year they were set
Year set
Standing records
1896
42
1897
43
1898
26
1899
38
1900
26
1901
32
1902
28
1903
31
1904
22
1905
29
1906
14
1907
23
1908
19
1909
40
1910
35
1911
40
1912
26
1913
21
1914
23
1915
30
1916
37
1917
37
1918
37
1919
19
1920
35
1921
36
1922
13
1923
12
1924
31
1925
40
1926
22
1927
22
1928
27
1929
21
1930
51
1931
41
1932
24
1933
30
1934
41
1935
19
1936
62
1937
22
1938
19
1939
28
1940
23
1941
16
1942
25
1943
21
1944
20
1945
29
1946
16
All-Time Record Progression
3 new records
3 all-time records were set at Waverly between 5 July 1936 and 8 September 1941. Each dot is a new record.
When Waverly set new all-time records
Date
Kind
Detail
1936-07-05
Record high maximum temperature
Record high maximum temperature 41.7 C (107.1 F)
1936-07-13
Record high maximum temperature
Record high maximum temperature 42.8 C (109.0 F)
1941-09-08
Record daily precipitation
Record daily precipitation 133.9 mm (5.3 in)
Wettest Day of Each Month
Sep: 133.9 mm (5.3 in)
The wettest day on record for each calendar month at Waverly. The most was 133.9 mm (5.3 in) on 8 September 1941.
Record daily precipitation for each month at Waverly
Month
Record daily precipitation (mm)
Date
Jan
43.4 mm (1.7 in)
5 January 1946
Feb
37.3 mm (1.5 in)
13 February 1911
Mar
45.7 mm (1.8 in)
29 March 1933
Apr
51.6 mm (2.0 in)
29 April 1909
May
77.5 mm (3.1 in)
3 May 1902
Jun
83.3 mm (3.3 in)
10 June 1900
Jul
73.4 mm (2.9 in)
6 July 1922
Aug
80.8 mm (3.2 in)
1 August 1931
Sep
133.9 mm (5.3 in)
8 September 1941
Oct
50.8 mm (2.0 in)
17 October 1898
Nov
83.3 mm (3.3 in)
4 November 1938
Dec
42.2 mm (1.7 in)
11 December 1899
Period of Record Coverage
1896 to 1946
Complete yearUnder 90 percent of days
51 years of record at Waverly, 1896 to 1946. 9 years have data for under 90 percent of days and are left out of rankings: 1896, 1912, 1913, 1914, 1925, 1926, 1928, 1935 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 36 complete years at Waverly, 1897 to 1945. Blue stripes are years cooler than the station's own mean of 8.3 C (47.0 F); red stripes are warmer. The coolest year was 1917, at 6.6 C (43.8 F), and the warmest was 1931, at 11.1 C (52.0 F). The strongest colour marks a difference of 2.8 C (5.0 F).
Annual mean temperature at Waverly as warming stripes, 1897 to 1945
Year
Annual mean temperature
Difference from the station mean
1897
7.9 C
-0.45 C
1898
8.3 C
-0.02 C
1899
8.2 C
-0.14 C
1900
9.1 C
+0.77 C
1901
8.9 C
+0.57 C
1902
8.1 C
-0.25 C
1903
7.7 C
-0.68 C
1904
7.0 C
-1.34 C
1905
7.4 C
-1.00 C
1907
7.8 C
-0.56 C
1908
8.9 C
+0.53 C
1909
7.8 C
-0.57 C
1915
7.9 C
-0.41 C
1916
8.2 C
-0.15 C
1917
6.6 C
-1.77 C
1918
8.7 C
+0.32 C
1919
8.3 C
-0.10 C
1920
8.2 C
-0.12 C
1921
10.5 C
+2.15 C
1923
8.5 C
+0.16 C
1924
7.0 C
-1.34 C
1927
8.2 C
-0.13 C
1931
11.1 C
+2.75 C
1932
8.2 C
-0.19 C
1933
9.5 C
+1.16 C
1934
9.7 C
+1.37 C
1936
7.8 C
-0.56 C
1937
7.3 C
-1.03 C
1938
9.1 C
+0.77 C
1939
9.6 C
+1.25 C
1940
7.8 C
-0.56 C
1941
9.5 C
+1.17 C
1942
8.0 C
-0.38 C
1943
7.6 C
-0.79 C
1944
8.7 C
+0.33 C
1945
7.5 C
-0.88 C
The fitted trend in annual mean temperature here over 1897 to 1945 is 0.1 C (-0.1 to 0.3) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.2 F (-0.2 to 0.6) per decade. The slope is a straight line fitted to 36 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Waverly
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.1 C (-0.1 to 0.3) per decade
0.2 F (-0.2 to 0.6) per decade
1897 to 1945
36
Not clearly different from zero
Mean daily maximum
0.19 C (-0.04 to 0.42) per decade
0.3 F (-0.1 to 0.8) per decade
1897 to 1945
36
Not clearly different from zero
Mean daily minimum
0.03 C (-0.20 to 0.26) per decade
0.1 F (-0.4 to 0.5) per decade
1897 to 1945
36
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
1896 to 1946
Yearly extremes at Waverly: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
42.8 C (109.0 F)
1936
36.1 C (97.0 F)
51
Coldest night (TNn)
-36.7 C (-34.1 F)
1912
-28.9 C (-20.0 F)
51
Wettest day (Rx1day)
133.9 mm (5.3 in)
1941
53.3 mm (2.1 in)
51
Wettest five days (Rx5day)
143.5 mm (5.6 in)
1914
87.9 mm (3.5 in)
51
Longest dry spell (CDD)
41 days
1916
24 days
51
Hottest day (TXx)
The hottest day of the year at Waverly, 1896 to 1946. The record is 42.8 C (109.0 F) in 1936, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Waverly by year
Year
Hottest day (TXx)
1896
35.6 C (96.1 F)
1897
36.1 C (97.0 F)
1898
35.6 C (96.1 F)
1899
33.9 C (93.0 F)
1900
34.4 C (93.9 F)
1901
41.1 C (106.0 F)
1902
32.8 C (91.0 F)
1903
32.8 C (91.0 F)
1904
33.9 C (93.0 F)
1905
34.4 C (93.9 F)
1906
33.9 C (93.0 F)
1907
33.3 C (91.9 F)
1908
33.9 C (93.0 F)
1909
33.3 C (91.9 F)
1910
36.1 C (97.0 F)
1911
40.6 C (105.1 F)
1912
37.2 C (99.0 F)
1913
38.9 C (102.0 F)
1914
36.1 C (97.0 F)
1915
32.2 C (90.0 F)
1916
40.0 C (104.0 F)
1917
38.3 C (100.9 F)
1918
38.9 C (102.0 F)
1919
37.8 C (100.0 F)
1920
35.6 C (96.1 F)
1921
37.2 C (99.0 F)
1922
37.2 C (99.0 F)
1923
36.7 C (98.1 F)
1924
33.3 C (91.9 F)
1925
37.8 C (100.0 F)
1926
36.1 C (97.0 F)
1927
35.6 C (96.1 F)
1928
35.0 C (95.0 F)
1929
34.4 C (93.9 F)
1930
39.4 C (102.9 F)
1931
39.4 C (102.9 F)
1932
36.1 C (97.0 F)
1933
37.8 C (100.0 F)
1934
41.1 C (106.0 F)
1935
37.2 C (99.0 F)
1936
42.8 C (109.0 F)
1937
40.0 C (104.0 F)
1938
35.0 C (95.0 F)
1939
38.3 C (100.9 F)
1940
40.6 C (105.1 F)
1941
37.8 C (100.0 F)
1942
34.4 C (93.9 F)
1943
35.6 C (96.1 F)
1944
36.1 C (97.0 F)
1945
36.1 C (97.0 F)
1946
36.7 C (98.1 F)
Coldest night (TNn)
The coldest night of the year at Waverly, 1896 to 1946. The record is -36.7 C (-34.1 F) in 1912, marked on the chart; the median year is -28.9 C (-20.0 F).
Coldest night (TNn) at Waverly by year
Year
Coldest night (TNn)
1896
-22.2 C (-8.0 F)
1897
-31.7 C (-25.1 F)
1898
-26.7 C (-16.1 F)
1899
-31.1 C (-24.0 F)
1900
-26.1 C (-15.0 F)
1901
-27.2 C (-17.0 F)
1902
-31.7 C (-25.1 F)
1903
-27.2 C (-17.0 F)
1904
-32.8 C (-27.0 F)
1905
-33.3 C (-27.9 F)
1906
-27.8 C (-18.0 F)
1907
-27.8 C (-18.0 F)
1908
-23.9 C (-11.0 F)
1909
-29.4 C (-20.9 F)
1910
-33.9 C (-29.0 F)
1911
-27.8 C (-18.0 F)
1912
-36.7 C (-34.1 F)
1913
-28.3 C (-18.9 F)
1914
-32.8 C (-27.0 F)
1915
-33.9 C (-29.0 F)
1916
-32.2 C (-26.0 F)
1917
-31.7 C (-25.1 F)
1918
-36.1 C (-33.0 F)
1919
-33.3 C (-27.9 F)
1920
-27.8 C (-18.0 F)
1921
-23.3 C (-9.9 F)
1922
-28.9 C (-20.0 F)
1923
-27.8 C (-18.0 F)
1924
-33.3 C (-27.9 F)
1925
-31.7 C (-25.1 F)
1926
-26.7 C (-16.1 F)
1927
-26.7 C (-16.1 F)
1928
-20.6 C (-5.1 F)
1929
-34.4 C (-29.9 F)
1930
-36.7 C (-34.1 F)
1931
-23.9 C (-11.0 F)
1932
-31.1 C (-24.0 F)
1933
-32.8 C (-27.0 F)
1934
-26.1 C (-15.0 F)
1935
-31.1 C (-24.0 F)
1936
-35.0 C (-31.0 F)
1937
-28.9 C (-20.0 F)
1938
-27.2 C (-17.0 F)
1939
-22.8 C (-9.0 F)
1940
-30.6 C (-23.1 F)
1941
-25.6 C (-14.1 F)
1942
-33.3 C (-27.9 F)
1943
-31.1 C (-24.0 F)
1944
-28.9 C (-20.0 F)
1945
-28.9 C (-20.0 F)
1946
-27.2 C (-17.0 F)
Wettest day (Rx1day)
The wettest day of the year at Waverly, 1896 to 1946. The record is 133.9 mm (5.3 in) in 1941, marked on the chart; the median year is 53.3 mm (2.1 in).
Wettest day (Rx1day) at Waverly by year
Year
Wettest day (Rx1day)
1896
70.6 mm (2.8 in)
1897
50.8 mm (2.0 in)
1898
50.8 mm (2.0 in)
1899
62.2 mm (2.4 in)
1900
83.3 mm (3.3 in)
1901
39.4 mm (1.6 in)
1902
77.5 mm (3.1 in)
1903
72.9 mm (2.9 in)
1904
44.2 mm (1.7 in)
1905
46.7 mm (1.8 in)
1906
44.5 mm (1.8 in)
1907
42.9 mm (1.7 in)
1908
51.1 mm (2.0 in)
1909
59.7 mm (2.4 in)
1910
36.8 mm (1.4 in)
1911
48.3 mm (1.9 in)
1912
57.2 mm (2.3 in)
1913
40.6 mm (1.6 in)
1914
71.1 mm (2.8 in)
1915
49.5 mm (1.9 in)
1916
39.4 mm (1.6 in)
1917
55.9 mm (2.2 in)
1918
43.7 mm (1.7 in)
1919
45.7 mm (1.8 in)
1920
69.9 mm (2.8 in)
1921
50.8 mm (2.0 in)
1922
73.4 mm (2.9 in)
1923
64.5 mm (2.5 in)
1924
48.3 mm (1.9 in)
1925
72.4 mm (2.9 in)
1926
52.3 mm (2.1 in)
1927
46.7 mm (1.8 in)
1928
57.4 mm (2.3 in)
1929
76.2 mm (3.0 in)
1930
69.3 mm (2.7 in)
1931
80.8 mm (3.2 in)
1932
51.8 mm (2.0 in)
1933
53.3 mm (2.1 in)
1934
49.5 mm (1.9 in)
1935
44.7 mm (1.8 in)
1936
62.7 mm (2.5 in)
1937
60.2 mm (2.4 in)
1938
83.3 mm (3.3 in)
1939
39.6 mm (1.6 in)
1940
57.2 mm (2.3 in)
1941
133.9 mm (5.3 in)
1942
68.1 mm (2.7 in)
1943
61.0 mm (2.4 in)
1944
33.3 mm (1.3 in)
1945
61.0 mm (2.4 in)
1946
43.4 mm (1.7 in)
Wettest five days (Rx5day)
The wettest five days of the year at Waverly, 1896 to 1946. The record is 143.5 mm (5.6 in) in 1914, marked on the chart; the median year is 87.9 mm (3.5 in).
Wettest five days (Rx5day) at Waverly by year
Year
Wettest five days (Rx5day)
1896
93.8 mm (3.7 in)
1897
54.1 mm (2.1 in)
1898
87.9 mm (3.5 in)
1899
92.1 mm (3.6 in)
1900
94.2 mm (3.7 in)
1901
62.7 mm (2.5 in)
1902
128.2 mm (5.0 in)
1903
126.0 mm (5.0 in)
1904
76.2 mm (3.0 in)
1905
91.0 mm (3.6 in)
1906
47.6 mm (1.9 in)
1907
97.6 mm (3.8 in)
1908
72.9 mm (2.9 in)
1909
95.7 mm (3.8 in)
1910
52.4 mm (2.1 in)
1911
86.3 mm (3.4 in)
1912
72.5 mm (2.9 in)
1913
53.3 mm (2.1 in)
1914
143.5 mm (5.6 in)
1915
90.1 mm (3.5 in)
1916
56.2 mm (2.2 in)
1917
89.1 mm (3.5 in)
1918
83.5 mm (3.3 in)
1919
81.4 mm (3.2 in)
1920
80.6 mm (3.2 in)
1921
106.7 mm (4.2 in)
1922
133.9 mm (5.3 in)
1923
85.9 mm (3.4 in)
1924
92.7 mm (3.6 in)
1925
98.6 mm (3.9 in)
1926
65.7 mm (2.6 in)
1927
64.7 mm (2.5 in)
1928
104.4 mm (4.1 in)
1929
87.6 mm (3.4 in)
1930
88.9 mm (3.5 in)
1931
106.4 mm (4.2 in)
1932
105.2 mm (4.1 in)
1933
105.4 mm (4.1 in)
1934
84.6 mm (3.3 in)
1935
74.3 mm (2.9 in)
1936
113.8 mm (4.5 in)
1937
96.0 mm (3.8 in)
1938
112.8 mm (4.4 in)
1939
63.2 mm (2.5 in)
1940
90.4 mm (3.6 in)
1941
139.2 mm (5.5 in)
1942
80.8 mm (3.2 in)
1943
82.6 mm (3.3 in)
1944
49.6 mm (2.0 in)
1945
76.4 mm (3.0 in)
1946
54.4 mm (2.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at Waverly, 1896 to 1946. The record is 41 days in 1916, marked on the chart; the median year is 24 days.
Longest dry spell (CDD) at Waverly by year
Year
Longest dry spell (CDD)
1896
24 days
1897
23 days
1898
13 days
1899
22 days
1900
18 days
1901
20 days
1902
19 days
1903
28 days
1904
29 days
1905
22 days
1906
19 days
1907
25 days
1908
28 days
1909
15 days
1910
36 days
1911
36 days
1912
26 days
1913
28 days
1914
15 days
1915
33 days
1916
41 days
1917
21 days
1918
22 days
1919
28 days
1920
19 days
1921
24 days
1922
28 days
1923
25 days
1924
17 days
1925
29 days
1926
15 days
1927
20 days
1928
18 days
1929
30 days
1930
32 days
1931
23 days
1932
30 days
1933
32 days
1934
33 days
1935
25 days
1936
21 days
1937
16 days
1938
19 days
1939
33 days
1940
18 days
1941
22 days
1942
39 days
1943
26 days
1944
27 days
1945
22 days
1946
20 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
36 years with a frost
Across 36 years with a frost, the median last spring frost at Waverly falls on 3 May and the median first autumn frost on 30 September, which leaves a median of 151 days between them.
Fitted over all years, the growing season changes by -0.4 days per decade at this station.
Frost dates and growing season at Waverly
Measure
Median, all years
Earliest period
Recent period (1903 to 1945)
Recent against earliest
Fitted trend
Last spring frost
3 May
n/a
3 May
n/a
0.0 days per decade
First autumn frost
30 September
n/a
30 September
n/a
-0.4 days per decade
Growing days
151 days
n/a
148 days
n/a
-0.4 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
41 years, 1897 to 1945
A day with at least 56.3 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 118.0 mm (4.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Waverly: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
56.3 mm (2.2 in)
5 years
71.0 mm (2.8 in)
10 years
81.4 mm (3.2 in)
25 years
95.5 mm (3.8 in)
50 years
106.5 mm (4.2 in)
Longer than the 41 years of record
100 years
118.0 mm (4.6 in)
Longer than the 41 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, 41 years of values from 1897 to 1945.
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: 133.9 mm (5.3 in) in 1941; 83.3 mm (3.3 in) in 1900; 83.3 mm (3.3 in) in 1938.
Download the Data
Data for Waverly standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Waverly 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.