Montezuma 1 W Weather Records (USC00135650)

Record envelope, standing records and threshold days for Montezuma 1 W (USC00135650), Iowa, United States, with 131 years of record.

Key Facts for Montezuma 1 W

Montezuma 1 W (USC00135650) is a weather station in Iowa, United States at 41.58 latitude and -92.55 longitude, 290 m (950 ft) above sea level.
The station reports from 1896 to 2026, 131 years of record.
1,464 records set at Montezuma 1 W still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Montezuma 1 W set a daily record precipitation of 23.4 mm (0.9 in) on 1 October 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

Location: Iowa, United States, 41.58 latitude, -92.55 longitude.
Elevation: 290 m (950 ft).
Period of record: 1896 to 2026, 131 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 Montezuma 1 W. 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 Montezuma 1 W, 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)	-28.9 C (-20.0 F)	n/a	n/a
Feb	15.6 C (60.1 F)	-23.3 C (-9.9 F)	n/a	n/a
Mar	29.4 C (84.9 F)	-15.0 C (5.0 F)	n/a	n/a
Apr	29.4 C (84.9 F)	-8.3 C (17.1 F)	n/a	n/a
May	35.6 C (96.1 F)	1.1 C (34.0 F)	n/a	n/a
Jun	35.0 C (95.0 F)	7.8 C (46.0 F)	n/a	n/a
Jul	37.8 C (100.0 F)	12.8 C (55.0 F)	n/a	n/a
Aug	37.8 C (100.0 F)	10.6 C (51.1 F)	n/a	n/a
Sep	37.8 C (100.0 F)	0.0 C (32.0 F)	n/a	n/a
Oct	33.3 C (91.9 F)	-6.7 C (19.9 F)	n/a	n/a
Nov	26.7 C (80.1 F)	-18.3 C (-0.9 F)	n/a	n/a
Dec	17.8 C (64.0 F)	-21.1 C (-6.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Montezuma 1 W still stand. 1938 holds the most, with 564.

Wettest Day of Each Month

Aug: 161.8 mm (6.4 in)

The wettest day on record for each calendar month at Montezuma 1 W. The most was 161.8 mm (6.4 in) on 5 August 1970.

Record daily precipitation for each month at Montezuma 1 W
Month	Record daily precipitation (mm)	Date
Jan	43.9 mm (1.7 in)	12 January 1960
Feb	36.1 mm (1.4 in)	23 February 1981
Mar	86.9 mm (3.4 in)	6 March 1959
Apr	112.3 mm (4.4 in)	14 April 2014
May	100.6 mm (4.0 in)	26 May 2013
Jun	119.4 mm (4.7 in)	17 June 1990
Jul	112.5 mm (4.4 in)	5 July 1993
Aug	161.8 mm (6.4 in)	5 August 1970
Sep	154.9 mm (6.1 in)	13 September 1961
Oct	78.2 mm (3.1 in)	9 October 1982
Nov	78.7 mm (3.1 in)	4 November 1938
Dec	72.4 mm (2.9 in)	14 December 2015

Period of Record Coverage

1904 to 1940

5 years of record at Montezuma 1 W, 1904 to 1940. 3 years have data for under 90 percent of days and are left out of rankings: 1904, 1937, 1940.

Latest Records

Latest records at Montezuma 1 W
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
1 October 2026	Montezuma 1 W, US	daily rain (Provisional)	23.4 mm (0.9 in)	13.5 mm (0.5 in)	64 years	20 of 100 (Routine)
9 September 2026	Montezuma 1 W, US	daily rain (Provisional)	101.1 mm (4.0 in)	46.5 mm (1.8 in)	36 years	49 of 100 (Notable)
15 April 2026	Montezuma 1 W, US	daily rain	39.4 mm (1.6 in)	16.5 mm (0.6 in)	39 years	35 of 100 (Notable)
9 January 2026	Montezuma 1 W, US	daily rain	27.9 mm (1.1 in)	13.2 mm (0.5 in)	2 years	33 of 100 (Routine)
13 December 2025	Montezuma 1 W, US	daily snowfall (Tie)	2.5 cm (1.0 in)	tie	68 years	7 of 100 (Routine)
30 November 2025	Montezuma 1 W, US	daily snow depth (Tie)	15.2 cm (6.0 in)	tie	51 years	6 of 100 (Routine)
29 November 2025	Montezuma 1 W, US	daily snowfall	5.1 cm (2.0 in)	2.6 cm (1.0 in)	20 years	23 of 100 (Routine)
29 November 2025	Montezuma 1 W, US	daily snow depth (Tie)	5.1 cm (2.0 in)	tie	88 years	9 of 100 (Routine)
29 July 2025	Montezuma 1 W, US	daily rain	31.0 mm (1.2 in)	1.0 mm (0.04 in)	39 years	21 of 100 (Routine)
20 July 2025	Montezuma 1 W, US	daily rain	57.7 mm (2.3 in)	14.3 mm (0.6 in)	63 years	36 of 100 (Notable)
21 April 2025	Montezuma 1 W, US	daily rain	32.8 mm (1.3 in)	2.6 mm (0.10 in)	64 years	31 of 100 (Routine)
31 October 2024	Montezuma 1 W, US	daily rain	54.9 mm (2.2 in)	16.8 mm (0.7 in)	50 years	39 of 100 (Notable)
3 May 2024	Montezuma 1 W, US	daily rain	36.8 mm (1.4 in)	5.3 mm (0.21 in)	45 years	27 of 100 (Routine)
23 March 2024	Montezuma 1 W, US	daily snowfall (Tie)	6.4 cm (2.5 in)	tie	31 years	4 of 100 (Routine)
10 January 2024	Montezuma 1 W, US	daily rain	11.7 mm (0.5 in)	2.3 mm (0.09 in)	14 years	18 of 100 (Routine)
10 January 2024	Montezuma 1 W, US	daily snowfall (Tie)	12.7 cm (5.0 in)	tie	66 years	7 of 100 (Routine)
9 January 2024	Montezuma 1 W, US	daily snowfall	14.5 cm (5.7 in)	6.1 cm (2.4 in)	85 years	48 of 100 (Notable)
9 January 2024	Montezuma 1 W, US	daily rain	14.7 mm (0.6 in)	4.5 mm (0.18 in)	85 years	20 of 100 (Routine)
26 November 2023	Montezuma 1 W, US	daily snow depth (Tie)	5.1 cm (2.0 in)	tie	70 years	7 of 100 (Routine)
11 August 2023	Montezuma 1 W, US	daily rain	38.9 mm (1.5 in)	1.1 mm (0.04 in)	12 years	13 of 100 (Routine)

Extremes by Year

1896 to 2026

Yearly extremes at Montezuma 1 W: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	37.8 C (100.0 F)	1937	37.2 C (99.0 F)	5
Coldest night (TNn)	-28.9 C (-20.0 F)	1940	-22.2 C (-8.0 F)	5
Wettest day (Rx1day)	161.8 mm (6.4 in)	1970	65.7 mm (2.6 in)	86
Wettest five days (Rx5day)	190.5 mm (7.5 in)	1961	92.5 mm (3.6 in)	85
Longest dry spell (CDD)	56 days	1952	23 days	86

Hottest day (TXx)

The hottest day of the year at Montezuma 1 W, 1896 to 2026. The record is 37.8 C (100.0 F) in 1937, marked on the chart; the median year is 37.2 C (99.0 F).

Hottest day (TXx) at Montezuma 1 W by year
Year	Hottest day (TXx)
1896	n/a
1904	21.1 C (70.0 F)
1905	n/a
1908	n/a
1937	37.8 C (100.0 F)
1938	37.2 C (99.0 F)
1939	37.8 C (100.0 F)
1940	23.3 C (73.9 F)
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
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	n/a
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

Coldest night (TNn)

The coldest night of the year at Montezuma 1 W, 1896 to 2026. The record is -28.9 C (-20.0 F) in 1940, marked on the chart; the median year is -22.2 C (-8.0 F).

Coldest night (TNn) at Montezuma 1 W by year
Year	Coldest night (TNn)
1896	n/a
1904	21.1 C (70.0 F)
1905	n/a
1908	n/a
1937	-18.3 C (-0.9 F)
1938	-22.2 C (-8.0 F)
1939	-22.8 C (-9.0 F)
1940	-28.9 C (-20.0 F)
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
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	n/a
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 Montezuma 1 W, 1896 to 2026. The record is 161.8 mm (6.4 in) in 1970, marked on the chart; the median year is 65.7 mm (2.6 in).

Wettest day (Rx1day) at Montezuma 1 W by year
Year	Wettest day (Rx1day)
1896	80.3 mm (3.2 in)
1904	78.7 mm (3.1 in)
1905	78.7 mm (3.1 in)
1908	52.1 mm (2.1 in)
1937	37.6 mm (1.5 in)
1938	78.7 mm (3.1 in)
1939	41.7 mm (1.6 in)
1940	22.1 mm (0.9 in)
1949	49.5 mm (1.9 in)
1950	86.4 mm (3.4 in)
1951	72.9 mm (2.9 in)
1952	76.2 mm (3.0 in)
1953	39.4 mm (1.6 in)
1954	76.7 mm (3.0 in)
1955	55.9 mm (2.2 in)
1956	39.4 mm (1.6 in)
1957	76.5 mm (3.0 in)
1958	47.0 mm (1.9 in)
1959	96.0 mm (3.8 in)
1960	48.3 mm (1.9 in)
1961	154.9 mm (6.1 in)
1962	64.3 mm (2.5 in)
1963	82.3 mm (3.2 in)
1964	42.2 mm (1.7 in)
1965	90.7 mm (3.6 in)
1966	87.6 mm (3.4 in)
1967	33.5 mm (1.3 in)
1968	35.6 mm (1.4 in)
1969	59.2 mm (2.3 in)
1970	161.8 mm (6.4 in)
1971	66.5 mm (2.6 in)
1972	102.6 mm (4.0 in)
1973	57.7 mm (2.3 in)
1974	92.2 mm (3.6 in)
1975	63.5 mm (2.5 in)
1976	83.8 mm (3.3 in)
1977	80.8 mm (3.2 in)
1978	82.0 mm (3.2 in)
1979	42.7 mm (1.7 in)
1980	50.8 mm (2.0 in)
1981	66.0 mm (2.6 in)
1982	99.1 mm (3.9 in)
1983	49.5 mm (1.9 in)
1984	65.3 mm (2.6 in)
1985	65.0 mm (2.6 in)
1986	102.9 mm (4.1 in)
1987	105.4 mm (4.1 in)
1988	72.4 mm (2.9 in)
1989	102.9 mm (4.1 in)
1990	119.4 mm (4.7 in)
1991	55.6 mm (2.2 in)
1992	56.6 mm (2.2 in)
1993	112.5 mm (4.4 in)
1994	46.2 mm (1.8 in)
1995	69.9 mm (2.8 in)
1996	68.8 mm (2.7 in)
1997	58.2 mm (2.3 in)
1998	61.0 mm (2.4 in)
1999	57.2 mm (2.3 in)
2000	48.0 mm (1.9 in)
2001	44.7 mm (1.8 in)
2002	82.3 mm (3.2 in)
2003	47.0 mm (1.9 in)
2004	60.7 mm (2.4 in)
2005	34.5 mm (1.4 in)
2006	63.0 mm (2.5 in)
2007	68.6 mm (2.7 in)
2008	62.7 mm (2.5 in)
2009	69.3 mm (2.7 in)
2010	109.2 mm (4.3 in)
2011	56.4 mm (2.2 in)
2012	43.7 mm (1.7 in)
2013	110.7 mm (4.4 in)
2014	112.3 mm (4.4 in)
2015	106.7 mm (4.2 in)
2016	69.1 mm (2.7 in)
2017	56.6 mm (2.2 in)
2018	131.1 mm (5.2 in)
2019	55.1 mm (2.2 in)
2020	55.6 mm (2.2 in)
2021	87.6 mm (3.4 in)
2022	69.6 mm (2.7 in)
2023	45.2 mm (1.8 in)
2024	54.9 mm (2.2 in)
2025	64.5 mm (2.5 in)
2026	101.1 mm (4.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Montezuma 1 W, 1896 to 2026. The record is 190.5 mm (7.5 in) in 1961, marked on the chart; the median year is 92.5 mm (3.6 in).

Wettest five days (Rx5day) at Montezuma 1 W by year
Year	Wettest five days (Rx5day)
1896	89.9 mm (3.5 in)
1904	89.0 mm (3.5 in)
1905	116.9 mm (4.6 in)
1908	86.5 mm (3.4 in)
1937	75.9 mm (3.0 in)
1938	115.5 mm (4.5 in)
1939	71.6 mm (2.8 in)
1940	26.7 mm (1.1 in)
1949	81.7 mm (3.2 in)
1950	109.8 mm (4.3 in)
1951	81.1 mm (3.2 in)
1952	98.6 mm (3.9 in)
1953	63.5 mm (2.5 in)
1954	101.5 mm (4.0 in)
1955	78.8 mm (3.1 in)
1956	56.2 mm (2.2 in)
1957	89.5 mm (3.5 in)
1958	65.3 mm (2.6 in)
1959	97.5 mm (3.8 in)
1960	101.5 mm (4.0 in)
1961	190.5 mm (7.5 in)
1962	85.3 mm (3.4 in)
1963	110.3 mm (4.3 in)
1964	82.1 mm (3.2 in)
1965	115.6 mm (4.6 in)
1966	158.5 mm (6.2 in)
1967	58.4 mm (2.3 in)
1968	52.9 mm (2.1 in)
1969	92.5 mm (3.6 in)
1970	180.8 mm (7.1 in)
1971	79.0 mm (3.1 in)
1972	104.9 mm (4.1 in)
1973	104.5 mm (4.1 in)
1974	119.1 mm (4.7 in)
1975	74.4 mm (2.9 in)
1976	106.1 mm (4.2 in)
1977	98.0 mm (3.9 in)
1978	179.2 mm (7.1 in)
1979	84.6 mm (3.3 in)
1980	92.7 mm (3.6 in)
1981	79.5 mm (3.1 in)
1982	160.1 mm (6.3 in)
1983	102.3 mm (4.0 in)
1984	85.9 mm (3.4 in)
1985	78.7 mm (3.1 in)
1986	110.5 mm (4.4 in)
1987	152.6 mm (6.0 in)
1988	80.1 mm (3.2 in)
1989	174.6 mm (6.9 in)
1990	160.0 mm (6.3 in)
1991	66.0 mm (2.6 in)
1992	79.2 mm (3.1 in)
1993	162.6 mm (6.4 in)
1994	52.8 mm (2.1 in)
1995	92.8 mm (3.7 in)
1996	106.6 mm (4.2 in)
1997	81.6 mm (3.2 in)
1998	105.7 mm (4.2 in)
1999	88.7 mm (3.5 in)
2000	68.1 mm (2.7 in)
2001	59.9 mm (2.4 in)
2002	102.7 mm (4.0 in)
2003	83.0 mm (3.3 in)
2004	92.2 mm (3.6 in)
2005	60.7 mm (2.4 in)
2006	76.7 mm (3.0 in)
2007	109.5 mm (4.3 in)
2008	101.3 mm (4.0 in)
2009	99.8 mm (3.9 in)
2010	147.3 mm (5.8 in)
2011	70.6 mm (2.8 in)
2012	n/a
2013	160.3 mm (6.3 in)
2014	168.4 mm (6.6 in)
2015	108.7 mm (4.3 in)
2016	39.3 mm (1.5 in)
2017	56.1 mm (2.2 in)
2018	17.3 mm (0.7 in)
2019	118.8 mm (4.7 in)
2020	123.5 mm (4.9 in)
2021	107.6 mm (4.2 in)
2022	76.7 mm (3.0 in)
2023	98.1 mm (3.9 in)
2024	110.5 mm (4.4 in)
2025	78.4 mm (3.1 in)
2026	89.4 mm (3.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Montezuma 1 W, 1896 to 2026. The record is 56 days in 1952, marked on the chart; the median year is 23 days.

Longest dry spell (CDD) at Montezuma 1 W by year
Year	Longest dry spell (CDD)
1896	11 days
1904	19 days
1905	19 days
1908	28 days
1937	16 days
1938	24 days
1939	24 days
1940	20 days
1949	21 days
1950	29 days
1951	16 days
1952	56 days
1953	23 days
1954	27 days
1955	18 days
1956	24 days
1957	27 days
1958	26 days
1959	22 days
1960	23 days
1961	18 days
1962	21 days
1963	25 days
1964	39 days
1965	13 days
1966	25 days
1967	29 days
1968	18 days
1969	32 days
1970	22 days
1971	31 days
1972	22 days
1973	18 days
1974	17 days
1975	23 days
1976	30 days
1977	17 days
1978	17 days
1979	18 days
1980	24 days
1981	35 days
1982	15 days
1983	20 days
1984	21 days
1985	20 days
1986	29 days
1987	49 days
1988	42 days
1989	35 days
1990	19 days
1991	32 days
1992	21 days
1993	24 days
1994	23 days
1995	29 days
1996	19 days
1997	19 days
1998	23 days
1999	37 days
2000	18 days
2001	27 days
2002	47 days
2003	18 days
2004	24 days
2005	24 days
2006	21 days
2007	30 days
2008	14 days
2009	24 days
2010	26 days
2011	23 days
2012	1 day
2013	14 days
2014	20 days
2015	26 days
2016	20 days
2017	23 days
2018	14 days
2019	8 days
2020	19 days
2021	29 days
2022	26 days
2023	23 days
2024	20 days
2025	27 days
2026	19 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

65 years, 1938 to 2023

A day with at least 67.0 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 158.5 mm (6.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Montezuma 1 W: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	67.0 mm (2.6 in)
5 years	89.5 mm (3.5 in)
10 years	105.2 mm (4.1 in)
25 years	125.9 mm (5.0 in)
50 years	141.9 mm (5.6 in)
100 years	158.5 mm (6.2 in)	Longer than the 65 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, 65 years of values from 1938 to 2023.

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: 161.8 mm (6.4 in) in 1970; 154.9 mm (6.1 in) in 1961; 119.4 mm (4.7 in) in 1990.

Download the Data

Data for Montezuma 1 W standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Montezuma 1 W 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 2026-10-15. Last revised 15 October 2026 (2026-10-15).

Year	Days with data	Share of year	Complete
1904	1	0%	No
1937	148	41%	No
1938	364	100%	Yes
1939	362	99%	Yes
1940	91	25%	No