Lake Mills Weather Records (USC00134557)

Record envelope, standing records and threshold days for Lake Mills (USC00134557), Iowa, United States, with 72 years of record.

Key Facts for Lake Mills

Lake Mills (USC00134557) is a weather station in Iowa, United States at 43.42 latitude and -93.53 longitude, 384 m (1,260 ft) above sea level.
The station reports from 1955 to 2026, 72 years of record.
60 records set at Lake Mills still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Lake Mills set a daily record precipitation of 36.1 mm (1.4 in) on 14 April 2026.

About the Station

Location: Iowa, United States, 43.42 latitude, -93.53 longitude.
Elevation: 384 m (1,260 ft).
Period of record: 1955 to 2026, 72 years.
Eligible elements: prcp, snow, snwd.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Lake Mills. 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 Lake Mills, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	n/a	n/a	n/a
Feb	n/a	n/a	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	n/a	n/a	n/a	n/a
May	n/a	n/a	n/a	n/a
Jun	n/a	n/a	n/a	n/a
Jul	38.3 C (100.9 F)	n/a	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	n/a	n/a	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	10.6 C (51.1 F)	-17.2 C (1.0 F)	n/a	n/a

Which Years Hold Standing Records

60 standing records

60 records at Lake Mills still stand. 1973 holds the most, with 56.

All-Time Record Progression

4 new records

4 all-time records were set at Lake Mills between 28 December 1987 and 18 August 2025. Each dot is a new record.

When Lake Mills set new all-time records
Date	Kind	Detail
1987-12-28	Record daily snowfall	Record daily snowfall 29.2 cm (11.5 in)
2018-03-24	Record daily snowfall	Record daily snowfall 30.5 cm (12.0 in)
2019-02-24	Record daily snowfall	Record daily snowfall 36.8 cm (14.5 in)
2025-08-18	Record daily precipitation	Record daily precipitation 139.7 mm (5.5 in)

Wettest Day of Each Month

Aug: 139.7 mm (5.5 in)

The wettest day on record for each calendar month at Lake Mills. The most was 139.7 mm (5.5 in) on 18 August 2025.

Record daily precipitation for each month at Lake Mills
Month	Record daily precipitation (mm)	Date
Jan	25.4 mm (1.0 in)	7 January 1966
Feb	38.1 mm (1.5 in)	24 February 2019
Mar	57.2 mm (2.3 in)	7 March 2026
Apr	72.1 mm (2.8 in)	7 April 2001
May	102.6 mm (4.0 in)	21 May 1959
Jun	130.6 mm (5.1 in)	1 June 1955
Jul	120.7 mm (4.8 in)	14 July 2013
Aug	139.7 mm (5.5 in)	18 August 2025
Sep	113.5 mm (4.5 in)	15 September 2004
Oct	68.6 mm (2.7 in)	26 October 2016
Nov	61.2 mm (2.4 in)	30 November 1991
Dec	40.4 mm (1.6 in)	28 December 1982

Period of Record Coverage

1973 to 1974

2 years of record at Lake Mills, 1973 to 1974. 2 years have data for under 90 percent of days and are left out of rankings: 1973, 1974.

Latest Records

Latest records at Lake Mills
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
14 April 2026	Lake Mills, US	daily rain	36.1 mm (1.4 in)	7.1 mm (0.28 in)	8 years	15 of 100 (Routine)
4 April 2026	Lake Mills, US	daily rain	23.4 mm (0.9 in)	4.3 mm (0.17 in)	8 years	13 of 100 (Routine)
15 March 2026	Lake Mills, US	daily snowfall	12.2 cm (4.8 in)	2.5 cm (1.0 in)	4 years	12 of 100 (Routine)
7 March 2026	Lake Mills, US	monthly rain	57.2 mm (2.3 in)	6.9 mm (0.27 in)	29 years	34 of 100 (Routine)
30 November 2025	Lake Mills, US	monthly snowfall	20.3 cm (8.0 in)	2.5 cm (1.0 in)	68 years	43 of 100 (Notable)
18 August 2025	Lake Mills, US	all-time rain	139.7 mm (5.5 in)	5.1 mm (0.20 in)	45 years	43 of 100 (Notable)
10 August 2025	Lake Mills, US	daily rain	101.6 mm (4.0 in)	15.0 mm (0.6 in)	44 years	29 of 100 (Routine)
24 July 2025	Lake Mills, US	daily rain	104.1 mm (4.1 in)	77.4 mm (3.0 in)	3 years	47 of 100 (Notable)
5 July 2025	Lake Mills, US	daily rain	55.9 mm (2.2 in)	15.3 mm (0.6 in)	70 years	37 of 100 (Notable)
17 June 2025	Lake Mills, US	daily rain	82.6 mm (3.3 in)	34.8 mm (1.4 in)	11 years	33 of 100 (Routine)
20 March 2025	Lake Mills, US	daily snowfall	19.6 cm (7.7 in)	10.7 cm (4.2 in)	60 years	45 of 100 (Notable)
5 March 2025	Lake Mills, US	daily snowfall	20.6 cm (8.1 in)	7.9 cm (3.1 in)	40 years	34 of 100 (Routine)
5 March 2025	Lake Mills, US	daily rain	24.4 mm (1.0 in)	10.7 mm (0.4 in)	20 years	20 of 100 (Routine)
19 November 2024	Lake Mills, US	daily rain	28.7 mm (1.1 in)	8.6 mm (0.34 in)	67 years	37 of 100 (Notable)
4 November 2024	Lake Mills, US	daily rain	22.4 mm (0.9 in)	8.2 mm (0.32 in)	60 years	20 of 100 (Routine)
31 October 2024	Lake Mills, US	daily rain	21.6 mm (0.9 in)	2.3 mm (0.09 in)	50 years	20 of 100 (Routine)
22 June 2024	Lake Mills, US	daily rain	111.0 mm (4.4 in)	70.1 mm (2.8 in)	67 years	67 of 100 (Major)
17 April 2024	Lake Mills, US	daily rain	47.8 mm (1.9 in)	17.1 mm (0.7 in)	42 years	34 of 100 (Routine)
9 January 2024	Lake Mills, US	daily snowfall	8.1 cm (3.2 in)	0.5 cm (0.2 in)	24 years	15 of 100 (Routine)
26 December 2023	Lake Mills, US	daily rain	14.5 mm (0.6 in)	0.8 mm (0.03 in)	6 years	9 of 100 (Routine)

Extremes by Year

1955 to 2026

Yearly extremes at Lake Mills: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	38.3 C (100.9 F)	1974	24.5 C (76.0 F)	2
Coldest night (TNn)	-17.2 C (1.0 F)	1973	-17.2 C (1.0 F)	1
Wettest day (Rx1day)	139.7 mm (5.5 in)	2025	66.7 mm (2.6 in)	72
Wettest five days (Rx5day)	181.1 mm (7.1 in)	1959	100.1 mm (3.9 in)	72
Longest dry spell (CDD)	60 days	1962	24 days	72

Hottest day (TXx)

The hottest day of the year at Lake Mills, 1955 to 2026. The record is 38.3 C (100.9 F) in 1974, marked on the chart; the median year is 24.5 C (76.0 F).

Hottest day (TXx) at Lake Mills by year
Year	Hottest day (TXx)
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	10.6 C (51.1 F)
1974	38.3 C (100.9 F)
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a
2011	n/a
2012	n/a
2013	n/a
2014	n/a
2015	n/a
2016	n/a
2017	n/a
2018	n/a
2019	n/a
2020	n/a
2021	n/a
2022	n/a
2023	n/a
2024	n/a
2025	n/a
2026	n/a

Coldest night (TNn)

The coldest night of the year at Lake Mills, 1955 to 2026. The record is -17.2 C (1.0 F) in 1973, marked on the chart; the median year is -17.2 C (1.0 F).

Coldest night (TNn) at Lake Mills by year
Year	Coldest night (TNn)
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	-17.2 C (1.0 F)
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a
2011	n/a
2012	n/a
2013	n/a
2014	n/a
2015	n/a
2016	n/a
2017	n/a
2018	n/a
2019	n/a
2020	n/a
2021	n/a
2022	n/a
2023	n/a
2024	n/a
2025	n/a
2026	n/a

Wettest day (Rx1day)

The wettest day of the year at Lake Mills, 1955 to 2026. The record is 139.7 mm (5.5 in) in 2025, marked on the chart; the median year is 66.7 mm (2.6 in).

Wettest day (Rx1day) at Lake Mills by year
Year	Wettest day (Rx1day)
1955	130.6 mm (5.1 in)
1956	55.1 mm (2.2 in)
1957	45.7 mm (1.8 in)
1958	30.2 mm (1.2 in)
1959	102.6 mm (4.0 in)
1960	48.3 mm (1.9 in)
1961	45.5 mm (1.8 in)
1962	75.7 mm (3.0 in)
1963	88.9 mm (3.5 in)
1964	102.9 mm (4.1 in)
1965	63.5 mm (2.5 in)
1966	63.0 mm (2.5 in)
1967	35.3 mm (1.4 in)
1968	76.7 mm (3.0 in)
1969	116.6 mm (4.6 in)
1970	47.0 mm (1.9 in)
1971	79.8 mm (3.1 in)
1972	57.7 mm (2.3 in)
1973	103.6 mm (4.1 in)
1974	40.6 mm (1.6 in)
1975	63.2 mm (2.5 in)
1976	29.7 mm (1.2 in)
1977	39.6 mm (1.6 in)
1978	83.3 mm (3.3 in)
1979	134.6 mm (5.3 in)
1980	86.6 mm (3.4 in)
1981	71.1 mm (2.8 in)
1982	57.2 mm (2.3 in)
1983	91.4 mm (3.6 in)
1984	57.2 mm (2.3 in)
1985	53.8 mm (2.1 in)
1986	45.7 mm (1.8 in)
1987	33.3 mm (1.3 in)
1988	36.6 mm (1.4 in)
1989	77.7 mm (3.1 in)
1990	106.9 mm (4.2 in)
1991	62.2 mm (2.4 in)
1992	53.8 mm (2.1 in)
1993	74.9 mm (2.9 in)
1994	43.4 mm (1.7 in)
1995	47.5 mm (1.9 in)
1996	69.1 mm (2.7 in)
1997	46.0 mm (1.8 in)
1998	91.2 mm (3.6 in)
1999	69.3 mm (2.7 in)
2000	65.5 mm (2.6 in)
2001	72.1 mm (2.8 in)
2002	112.3 mm (4.4 in)
2003	52.3 mm (2.1 in)
2004	113.5 mm (4.5 in)
2005	63.0 mm (2.5 in)
2006	114.8 mm (4.5 in)
2007	59.4 mm (2.3 in)
2008	82.6 mm (3.3 in)
2009	69.9 mm (2.8 in)
2010	67.8 mm (2.7 in)
2011	69.9 mm (2.8 in)
2012	36.6 mm (1.4 in)
2013	120.7 mm (4.8 in)
2014	57.4 mm (2.3 in)
2015	50.0 mm (2.0 in)
2016	94.5 mm (3.7 in)
2017	54.6 mm (2.1 in)
2018	72.4 mm (2.9 in)
2019	63.5 mm (2.5 in)
2020	74.7 mm (2.9 in)
2021	86.1 mm (3.4 in)
2022	93.5 mm (3.7 in)
2023	45.7 mm (1.8 in)
2024	111.0 mm (4.4 in)
2025	139.7 mm (5.5 in)
2026	57.2 mm (2.3 in)

Wettest five days (Rx5day)

The wettest five days of the year at Lake Mills, 1955 to 2026. The record is 181.1 mm (7.1 in) in 1959, marked on the chart; the median year is 100.1 mm (3.9 in).

Wettest five days (Rx5day) at Lake Mills by year
Year	Wettest five days (Rx5day)
1955	145.8 mm (5.7 in)
1956	83.6 mm (3.3 in)
1957	73.0 mm (2.9 in)
1958	48.7 mm (1.9 in)
1959	181.1 mm (7.1 in)
1960	63.3 mm (2.5 in)
1961	51.5 mm (2.0 in)
1962	130.3 mm (5.1 in)
1963	123.2 mm (4.9 in)
1964	134.4 mm (5.3 in)
1965	117.7 mm (4.6 in)
1966	79.5 mm (3.1 in)
1967	51.3 mm (2.0 in)
1968	138.4 mm (5.4 in)
1969	127.8 mm (5.0 in)
1970	86.3 mm (3.4 in)
1971	94.8 mm (3.7 in)
1972	78.3 mm (3.1 in)
1973	161.0 mm (6.3 in)
1974	74.2 mm (2.9 in)
1975	122.1 mm (4.8 in)
1976	56.6 mm (2.2 in)
1977	73.2 mm (2.9 in)
1978	110.8 mm (4.4 in)
1979	170.7 mm (6.7 in)
1980	148.5 mm (5.8 in)
1981	131.5 mm (5.2 in)
1982	68.1 mm (2.7 in)
1983	115.0 mm (4.5 in)
1984	109.8 mm (4.3 in)
1985	66.9 mm (2.6 in)
1986	73.9 mm (2.9 in)
1987	54.4 mm (2.1 in)
1988	64.3 mm (2.5 in)
1989	89.1 mm (3.5 in)
1990	138.1 mm (5.4 in)
1991	102.5 mm (4.0 in)
1992	77.9 mm (3.1 in)
1993	101.8 mm (4.0 in)
1994	66.9 mm (2.6 in)
1995	91.8 mm (3.6 in)
1996	79.0 mm (3.1 in)
1997	61.5 mm (2.4 in)
1998	145.8 mm (5.7 in)
1999	137.3 mm (5.4 in)
2000	89.8 mm (3.5 in)
2001	91.7 mm (3.6 in)
2002	115.3 mm (4.5 in)
2003	85.5 mm (3.4 in)
2004	144.0 mm (5.7 in)
2005	82.8 mm (3.3 in)
2006	120.9 mm (4.8 in)
2007	144.3 mm (5.7 in)
2008	166.9 mm (6.6 in)
2009	77.5 mm (3.1 in)
2010	84.4 mm (3.3 in)
2011	104.2 mm (4.1 in)
2012	57.2 mm (2.3 in)
2013	164.8 mm (6.5 in)
2014	126.3 mm (5.0 in)
2015	99.3 mm (3.9 in)
2016	111.7 mm (4.4 in)
2017	78.5 mm (3.1 in)
2018	140.1 mm (5.5 in)
2019	147.9 mm (5.8 in)
2020	75.7 mm (3.0 in)
2021	137.7 mm (5.4 in)
2022	100.9 mm (4.0 in)
2023	77.8 mm (3.1 in)
2024	141.5 mm (5.6 in)
2025	146.1 mm (5.8 in)
2026	85.4 mm (3.4 in)

Longest dry spell (CDD)

The longest dry spell of the year at Lake Mills, 1955 to 2026. The record is 60 days in 1962, marked on the chart; the median year is 24 days.

Longest dry spell (CDD) at Lake Mills by year
Year	Longest dry spell (CDD)
1955	25 days
1956	23 days
1957	22 days
1958	22 days
1959	23 days
1960	28 days
1961	17 days
1962	60 days
1963	26 days
1964	38 days
1965	22 days
1966	26 days
1967	38 days
1968	27 days
1969	19 days
1970	24 days
1971	14 days
1972	24 days
1973	17 days
1974	18 days
1975	17 days
1976	39 days
1977	18 days
1978	20 days
1979	24 days
1980	38 days
1981	31 days
1982	24 days
1983	17 days
1984	29 days
1985	18 days
1986	35 days
1987	30 days
1988	25 days
1989	25 days
1990	20 days
1991	21 days
1992	20 days
1993	17 days
1994	26 days
1995	24 days
1996	36 days
1997	19 days
1998	35 days
1999	23 days
2000	16 days
2001	20 days
2002	23 days
2003	26 days
2004	25 days
2005	15 days
2006	23 days
2007	30 days
2008	16 days
2009	26 days
2010	27 days
2011	20 days
2012	25 days
2013	23 days
2014	18 days
2015	24 days
2016	26 days
2017	25 days
2018	24 days
2019	17 days
2020	28 days
2021	18 days
2022	19 days
2023	22 days
2024	40 days
2025	41 days
2026	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.

Rainfall Return Levels

67 years, 1956 to 2025

A day with at least 66.6 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 154.0 mm (6.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Lake Mills: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	66.6 mm (2.6 in)
5 years	90.9 mm (3.6 in)
10 years	106.6 mm (4.2 in)
25 years	126.1 mm (5.0 in)
50 years	140.2 mm (5.5 in)
100 years	154.0 mm (6.1 in)	Longer than the 67 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, 67 years of values from 1956 to 2025.

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: 139.7 mm (5.5 in) in 2025; 134.6 mm (5.3 in) in 1979; 120.7 mm (4.8 in) in 2013.

Download the Data

Data for Lake Mills standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Lake Mills 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.

Data as of 2026-10-12. Last revised 12 October 2026 (2026-10-12).