Blockton 1W Weather Records (USC00130745)

Record envelope, standing records and threshold days for Blockton 1W (USC00130745), Iowa, United States, with 125 years of record.

Key Facts for Blockton 1W

Blockton 1W (USC00130745) is a weather station in Iowa, United States at 40.62 latitude and -94.50 longitude, 363 m (1,190 ft) above sea level.
The station reports from 1893 to 2017, 125 years of record.
1,316 records set at Blockton 1W still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Blockton 1W set a daily record precipitation of 93.0 mm (3.7 in) on 29 June 2017.

About the Station

Location: Iowa, United States, 40.62 latitude, -94.50 longitude.
Elevation: 363 m (1,190 ft).
Period of record: 1893 to 2017, 125 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 Blockton 1W. 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 Blockton 1W, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	6.1 C (43.0 F)	-26.1 C (-15.0 F)	n/a	n/a
Feb	8.9 C (48.0 F)	-26.1 C (-15.0 F)	n/a	n/a
Mar	22.8 C (73.0 F)	-16.7 C (1.9 F)	n/a	n/a
Apr	27.2 C (81.0 F)	-11.7 C (10.9 F)	n/a	n/a
May	29.4 C (84.9 F)	5.0 C (41.0 F)	n/a	n/a
Jun	33.9 C (93.0 F)	8.3 C (46.9 F)	n/a	n/a
Jul	33.9 C (93.0 F)	11.1 C (52.0 F)	n/a	n/a
Aug	34.4 C (93.9 F)	10.6 C (51.1 F)	n/a	n/a
Sep	36.1 C (97.0 F)	-2.2 C (28.0 F)	n/a	n/a
Oct	31.7 C (89.1 F)	-2.2 C (28.0 F)	n/a	n/a
Nov	20.0 C (68.0 F)	-11.7 C (10.9 F)	n/a	n/a
Dec	n/a	n/a	n/a	n/a

Which Years Hold Standing Records

1,316 standing records

1,316 records at Blockton 1W still stand. 1899 holds the most, with 960.

All-Time Record Progression

2 new records

2 all-time records were set at Blockton 1W between 13 February 1978 and 9 December 2009. Each dot is a new record.

When Blockton 1W set new all-time records
Date	Kind	Detail
1978-02-13	Record daily snowfall	Record daily snowfall 25.4 cm (10.0 in)
2009-12-09	Record daily snowfall	Record daily snowfall 29.2 cm (11.5 in)

Wettest Day of Each Month

Jul: 163.3 mm (6.4 in)

The wettest day on record for each calendar month at Blockton 1W. The most was 163.3 mm (6.4 in) on 2 July 1956.

Record daily precipitation for each month at Blockton 1W
Month	Record daily precipitation (mm)	Date
Jan	31.8 mm (1.3 in)	5 January 1955
Feb	52.6 mm (2.1 in)	18 February 1961
Mar	52.8 mm (2.1 in)	30 March 2012
Apr	96.5 mm (3.8 in)	18 April 2013
May	96.5 mm (3.8 in)	15 May 1943
Jun	108.5 mm (4.3 in)	26 June 1966
Jul	163.3 mm (6.4 in)	2 July 1956
Aug	127.0 mm (5.0 in)	5 August 1959
Sep	93.2 mm (3.7 in)	18 September 2004
Oct	101.6 mm (4.0 in)	8 October 1982
Nov	95.8 mm (3.8 in)	17 November 1952
Dec	58.4 mm (2.3 in)	14 December 2015

Period of Record Coverage

1893 to 1899

2 years of record at Blockton 1W, 1893 to 1899. 2 years have data for under 90 percent of days and are left out of rankings: 1893, 1899.

Latest Records

Latest records at Blockton 1W
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
29 June 2017	Blockton 1W, US	daily rain	93.0 mm (3.7 in)	51.9 mm (2.0 in)	62 years	60 of 100 (Major)
10 April 2017	Blockton 1W, US	daily rain	39.1 mm (1.5 in)	2.0 mm (0.08 in)	63 years	29 of 100 (Routine)
1 August 2016	Blockton 1W, US	daily rain	71.6 mm (2.8 in)	24.4 mm (1.0 in)	1 year	23 of 100 (Routine)
18 July 2016	Blockton 1W, US	daily rain	100.3 mm (3.9 in)	64.5 mm (2.5 in)	29 years	56 of 100 (Notable)
7 July 2016	Blockton 1W, US	daily rain	25.4 mm (1.0 in)	1.0 mm (0.04 in)	60 years	28 of 100 (Routine)
9 March 2016	Blockton 1W, US	daily rain	27.9 mm (1.1 in)	18.5 mm (0.7 in)	19 years	34 of 100 (Routine)
2 February 2016	Blockton 1W, US	daily rain	13.7 mm (0.5 in)	5.8 mm (0.23 in)	12 years	20 of 100 (Routine)
8 January 2016	Blockton 1W, US	daily rain	9.4 mm (0.37 in)	1.0 mm (0.04 in)	41 years	20 of 100 (Routine)
29 December 2015	Blockton 1W, US	daily snowfall (Tie)	10.2 cm (4.0 in)	tie	66 years	7 of 100 (Routine)
21 December 2015	Blockton 1W, US	daily rain	7.6 mm (0.30 in)	1.8 mm (0.07 in)	30 years	20 of 100 (Routine)
14 December 2015	Blockton 1W, US	monthly rain	58.4 mm (2.3 in)	14.2 mm (0.6 in)	49 years	53 of 100 (Notable)
27 November 2015	Blockton 1W, US	daily rain	37.1 mm (1.5 in)	12.0 mm (0.5 in)	24 years	27 of 100 (Routine)
18 August 2015	Blockton 1W, US	daily rain	37.6 mm (1.5 in)	1.5 mm (0.06 in)	52 years	25 of 100 (Routine)
1 August 2015	Blockton 1W, US	daily rain	47.2 mm (1.9 in)	4.8 mm (0.19 in)	53 years	28 of 100 (Routine)
29 July 2015	Blockton 1W, US	daily rain	86.4 mm (3.4 in)	47.3 mm (1.9 in)	36 years	48 of 100 (Notable)
16 July 2015	Blockton 1W, US	daily rain	63.0 mm (2.5 in)	6.9 mm (0.27 in)	46 years	28 of 100 (Routine)
17 May 2015	Blockton 1W, US	daily rain	82.0 mm (3.2 in)	53.3 mm (2.1 in)	68 years	68 of 100 (Major)
1 February 2015	Blockton 1W, US	monthly snowfall (Tie)	25.4 cm (10.0 in)	tie	36 years	7 of 100 (Routine)
4 January 2015	Blockton 1W, US	daily snowfall (Tie)	7.6 cm (3.0 in)	tie	37 years	5 of 100 (Routine)
16 December 2014	Blockton 1W, US	daily rain	15.7 mm (0.6 in)	7.8 mm (0.31 in)	32 years	20 of 100 (Routine)

Extremes by Year

1893 to 2017

Yearly extremes at Blockton 1W: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	36.1 C (97.0 F)	1899	29.5 C (85.0 F)	2
Coldest night (TNn)	-26.1 C (-15.0 F)	1893	-18.9 C (-2.0 F)	2
Wettest day (Rx1day)	163.3 mm (6.4 in)	1956	71.1 mm (2.8 in)	77
Wettest five days (Rx5day)	191.5 mm (7.5 in)	1956	105.7 mm (4.2 in)	74
Longest dry spell (CDD)	58 days	1899	26 days	77

Hottest day (TXx)

The hottest day of the year at Blockton 1W, 1893 to 2017. The record is 36.1 C (97.0 F) in 1899, marked on the chart; the median year is 29.5 C (85.0 F).

Hottest day (TXx) at Blockton 1W by year
Year	Hottest day (TXx)
1893	22.8 C (73.0 F)
1899	36.1 C (97.0 F)
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
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

Coldest night (TNn)

The coldest night of the year at Blockton 1W, 1893 to 2017. The record is -26.1 C (-15.0 F) in 1893, marked on the chart; the median year is -18.9 C (-2.0 F).

Coldest night (TNn) at Blockton 1W by year
Year	Coldest night (TNn)
1893	-26.1 C (-15.0 F)
1899	-11.7 C (10.9 F)
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
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

Wettest day (Rx1day)

The wettest day of the year at Blockton 1W, 1893 to 2017. The record is 163.3 mm (6.4 in) in 1956, marked on the chart; the median year is 71.1 mm (2.8 in).

Wettest day (Rx1day) at Blockton 1W by year
Year	Wettest day (Rx1day)
1893	30.5 mm (1.2 in)
1899	60.5 mm (2.4 in)
1943	113.0 mm (4.4 in)
1944	59.2 mm (2.3 in)
1945	51.3 mm (2.0 in)
1946	85.1 mm (3.4 in)
1947	70.4 mm (2.8 in)
1948	47.0 mm (1.9 in)
1949	56.6 mm (2.2 in)
1950	76.2 mm (3.0 in)
1951	48.3 mm (1.9 in)
1952	95.8 mm (3.8 in)
1953	33.3 mm (1.3 in)
1954	62.7 mm (2.5 in)
1955	62.2 mm (2.4 in)
1956	163.3 mm (6.4 in)
1957	35.8 mm (1.4 in)
1958	59.7 mm (2.4 in)
1959	127.0 mm (5.0 in)
1960	86.4 mm (3.4 in)
1961	69.9 mm (2.8 in)
1962	92.7 mm (3.6 in)
1963	66.3 mm (2.6 in)
1964	57.4 mm (2.3 in)
1965	61.5 mm (2.4 in)
1966	108.5 mm (4.3 in)
1967	47.0 mm (1.9 in)
1968	59.4 mm (2.3 in)
1969	88.1 mm (3.5 in)
1970	41.9 mm (1.6 in)
1971	69.1 mm (2.7 in)
1972	42.9 mm (1.7 in)
1973	100.3 mm (3.9 in)
1974	88.1 mm (3.5 in)
1975	55.1 mm (2.2 in)
1976	52.6 mm (2.1 in)
1977	104.6 mm (4.1 in)
1978	68.8 mm (2.7 in)
1979	78.7 mm (3.1 in)
1980	72.4 mm (2.9 in)
1981	82.3 mm (3.2 in)
1982	101.6 mm (4.0 in)
1983	75.2 mm (3.0 in)
1984	59.9 mm (2.4 in)
1985	73.2 mm (2.9 in)
1986	96.0 mm (3.8 in)
1987	60.2 mm (2.4 in)
1988	51.8 mm (2.0 in)
1989	80.5 mm (3.2 in)
1990	95.3 mm (3.8 in)
1991	61.0 mm (2.4 in)
1992	80.8 mm (3.2 in)
1993	81.0 mm (3.2 in)
1994	46.2 mm (1.8 in)
1995	85.1 mm (3.4 in)
1996	49.5 mm (1.9 in)
1997	34.8 mm (1.4 in)
1998	41.9 mm (1.6 in)
1999	61.2 mm (2.4 in)
2000	71.1 mm (2.8 in)
2001	80.0 mm (3.1 in)
2002	33.0 mm (1.3 in)
2003	74.4 mm (2.9 in)
2004	93.2 mm (3.7 in)
2005	65.5 mm (2.6 in)
2006	71.9 mm (2.8 in)
2007	95.5 mm (3.8 in)
2008	78.0 mm (3.1 in)
2009	71.6 mm (2.8 in)
2010	82.8 mm (3.3 in)
2011	48.0 mm (1.9 in)
2012	59.2 mm (2.3 in)
2013	96.5 mm (3.8 in)
2014	111.8 mm (4.4 in)
2015	86.4 mm (3.4 in)
2016	100.3 mm (3.9 in)
2017	93.0 mm (3.7 in)

Wettest five days (Rx5day)

The wettest five days of the year at Blockton 1W, 1893 to 2017. The record is 191.5 mm (7.5 in) in 1956, marked on the chart; the median year is 105.7 mm (4.2 in).

Wettest five days (Rx5day) at Blockton 1W by year
Year	Wettest five days (Rx5day)
1893	30.5 mm (1.2 in)
1899	88.0 mm (3.5 in)
1943	134.6 mm (5.3 in)
1944	87.4 mm (3.4 in)
1945	90.6 mm (3.6 in)
1946	127.0 mm (5.0 in)
1947	112.8 mm (4.4 in)
1948	64.8 mm (2.6 in)
1949	64.0 mm (2.5 in)
1950	89.9 mm (3.5 in)
1951	64.3 mm (2.5 in)
1952	104.1 mm (4.1 in)
1953	66.3 mm (2.6 in)
1954	98.3 mm (3.9 in)
1955	85.3 mm (3.4 in)
1956	191.5 mm (7.5 in)
1957	63.4 mm (2.5 in)
1958	86.3 mm (3.4 in)
1959	160.8 mm (6.3 in)
1960	149.1 mm (5.9 in)
1961	114.1 mm (4.5 in)
1962	131.3 mm (5.2 in)
1963	67.3 mm (2.6 in)
1964	132.9 mm (5.2 in)
1965	97.3 mm (3.8 in)
1966	134.9 mm (5.3 in)
1967	85.8 mm (3.4 in)
1968	110.3 mm (4.3 in)
1969	120.9 mm (4.8 in)
1970	82.1 mm (3.2 in)
1971	106.4 mm (4.2 in)
1972	98.8 mm (3.9 in)
1973	139.7 mm (5.5 in)
1974	110.2 mm (4.3 in)
1975	98.6 mm (3.9 in)
1976	101.9 mm (4.0 in)
1977	136.6 mm (5.4 in)
1978	129.7 mm (5.1 in)
1979	114.0 mm (4.5 in)
1980	147.0 mm (5.8 in)
1981	153.4 mm (6.0 in)
1982	126.5 mm (5.0 in)
1983	80.0 mm (3.1 in)
1984	106.7 mm (4.2 in)
1985	98.4 mm (3.9 in)
1986	114.8 mm (4.5 in)
1987	116.4 mm (4.6 in)
1988	75.1 mm (3.0 in)
1989	160.0 mm (6.3 in)
1990	110.0 mm (4.3 in)
1991	156.0 mm (6.1 in)
1992	85.4 mm (3.4 in)
1993	186.7 mm (7.4 in)
1994	68.5 mm (2.7 in)
1995	112.0 mm (4.4 in)
1996	112.2 mm (4.4 in)
1997	67.1 mm (2.6 in)
1998	87.1 mm (3.4 in)
1999	63.0 mm (2.5 in)
2000	88.9 mm (3.5 in)
2001	90.4 mm (3.6 in)
2002	64.5 mm (2.5 in)
2003	108.4 mm (4.3 in)
2004	100.1 mm (3.9 in)
2005	129.0 mm (5.1 in)
2006	120.9 mm (4.8 in)
2007	159.2 mm (6.3 in)
2008	121.5 mm (4.8 in)
2009	99.3 mm (3.9 in)
2010	113.8 mm (4.5 in)
2011	n/a
2012	n/a
2013	105.0 mm (4.1 in)
2014	122.0 mm (4.8 in)
2015	103.1 mm (4.1 in)
2016	37.4 mm (1.5 in)
2017	n/a

Longest dry spell (CDD)

The longest dry spell of the year at Blockton 1W, 1893 to 2017. The record is 58 days in 1899, marked on the chart; the median year is 26 days.

Longest dry spell (CDD) at Blockton 1W by year
Year	Longest dry spell (CDD)
1893	41 days
1899	58 days
1943	39 days
1944	24 days
1945	25 days
1946	25 days
1947	26 days
1948	40 days
1949	28 days
1950	31 days
1951	15 days
1952	58 days
1953	29 days
1954	49 days
1955	29 days
1956	38 days
1957	38 days
1958	32 days
1959	28 days
1960	26 days
1961	23 days
1962	17 days
1963	31 days
1964	21 days
1965	20 days
1966	27 days
1967	28 days
1968	26 days
1969	24 days
1970	42 days
1971	35 days
1972	38 days
1973	19 days
1974	22 days
1975	25 days
1976	27 days
1977	30 days
1978	23 days
1979	35 days
1980	28 days
1981	30 days
1982	18 days
1983	33 days
1984	30 days
1985	24 days
1986	33 days
1987	23 days
1988	31 days
1989	35 days
1990	19 days
1991	22 days
1992	22 days
1993	24 days
1994	43 days
1995	23 days
1996	25 days
1997	17 days
1998	23 days
1999	37 days
2000	19 days
2001	23 days
2002	46 days
2003	21 days
2004	25 days
2005	30 days
2006	33 days
2007	22 days
2008	14 days
2009	25 days
2010	26 days
2011	1 day
2012	1 day
2013	17 days
2014	23 days
2015	51 days
2016	1 day
2017	1 day

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

66 years, 1943 to 2010

A day with at least 68.7 mm (2.7 in) of rain is expected about once in 2 years. A day with at least 138.1 mm (5.4 in) of rain is expected about once in 100 years.

Rainfall return levels at Blockton 1W: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	68.7 mm (2.7 in)
5 years	89.6 mm (3.5 in)
10 years	102.5 mm (4.0 in)
25 years	117.6 mm (4.6 in)
50 years	128.2 mm (5.0 in)
100 years	138.1 mm (5.4 in)	Longer than the 66 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, 66 years of values from 1943 to 2010.

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: 163.3 mm (6.4 in) in 1956; 127.0 mm (5.0 in) in 1959; 113.0 mm (4.4 in) in 1943.

Download the Data

Data for Blockton 1W standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Blockton 1W 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.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Days with data per year at Blockton 1W
Year	Days with data	Share of year	Complete
1893	89	24%	No
1899	240	66%	No