Merrill 4 WSW Weather Records (USC00135418)

Record envelope, standing records and threshold days for Merrill 4 WSW (USC00135418), Iowa, United States, with 37 years of record.

Key Facts for Merrill 4 WSW

Merrill 4 WSW (USC00135418) is a weather station in Iowa, United States at 42.70 latitude and -96.33 longitude, 421 m (1,381 ft) above sea level.
The station reports from 1941 to 1977, 37 years of record.
2 records set at Merrill 4 WSW still stand.
Records are tracked for prcp, snow: an element needs 30 years of data to be eligible.

About the Station

Location: Iowa, United States, 42.70 latitude, -96.33 longitude.
Elevation: 421 m (1,381 ft).
Period of record: 1941 to 1977, 37 years.
Eligible elements: prcp, snow.

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 Merrill 4 WSW. 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 Merrill 4 WSW, 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	n/a	n/a	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	n/a	37.2 C (99.0 F)	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a

Which Years Hold Standing Records

2 standing records

2 records at Merrill 4 WSW still stand. 1948 holds the most, with 2.

Wettest Day of Each Month

Jun: 131.3 mm (5.2 in)

The wettest day on record for each calendar month at Merrill 4 WSW. The most was 131.3 mm (5.2 in) on 7 June 1953.

Record daily precipitation for each month at Merrill 4 WSW
Month	Record daily precipitation (mm)	Date
Jan	29.2 mm (1.1 in)	4 January 1949
Feb	35.1 mm (1.4 in)	18 February 1971
Mar	38.6 mm (1.5 in)	14 March 1973
Apr	53.3 mm (2.1 in)	1 April 1960
May	91.4 mm (3.6 in)	1 May 1972
Jun	131.3 mm (5.2 in)	7 June 1953
Jul	100.8 mm (4.0 in)	9 July 1973
Aug	67.8 mm (2.7 in)	28 August 1960
Sep	118.9 mm (4.7 in)	11 September 1949
Oct	78.2 mm (3.1 in)	17 October 1968
Nov	36.1 mm (1.4 in)	9 November 1977
Dec	27.7 mm (1.1 in)	3 December 1953

Latest Records

No records were set at this station in the latest data.

Extremes by Year

1941 to 1977

Yearly extremes at Merrill 4 WSW: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Coldest night (TNn)	37.2 C (99.0 F)	1948	37.2 C (99.0 F)	1
Wettest day (Rx1day)	131.3 mm (5.2 in)	1953	56.1 mm (2.2 in)	31
Wettest five days (Rx5day)	139.2 mm (5.5 in)	1953	87.6 mm (3.4 in)	31
Longest dry spell (CDD)	70 days	1976	31 days	31

Coldest night (TNn)

The coldest night of the year at Merrill 4 WSW, 1941 to 1977. The record is 37.2 C (99.0 F) in 1948, marked on the chart; the median year is 37.2 C (99.0 F).

Coldest night (TNn) at Merrill 4 WSW by year
Year	Coldest night (TNn)
1941	n/a
1948	37.2 C (99.0 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

Wettest day (Rx1day)

The wettest day of the year at Merrill 4 WSW, 1941 to 1977. The record is 131.3 mm (5.2 in) in 1953, marked on the chart; the median year is 56.1 mm (2.2 in).

Wettest day (Rx1day) at Merrill 4 WSW by year
Year	Wettest day (Rx1day)
1941	32.5 mm (1.3 in)
1948	48.3 mm (1.9 in)
1949	118.9 mm (4.7 in)
1950	74.9 mm (2.9 in)
1951	96.5 mm (3.8 in)
1952	78.7 mm (3.1 in)
1953	131.3 mm (5.2 in)
1954	41.9 mm (1.6 in)
1955	46.2 mm (1.8 in)
1956	26.2 mm (1.0 in)
1957	45.0 mm (1.8 in)
1958	79.2 mm (3.1 in)
1959	41.4 mm (1.6 in)
1960	67.8 mm (2.7 in)
1961	53.1 mm (2.1 in)
1962	43.7 mm (1.7 in)
1963	50.8 mm (2.0 in)
1964	70.1 mm (2.8 in)
1965	74.2 mm (2.9 in)
1966	67.3 mm (2.6 in)
1967	56.1 mm (2.2 in)
1968	78.2 mm (3.1 in)
1969	59.7 mm (2.4 in)
1970	41.4 mm (1.6 in)
1971	40.6 mm (1.6 in)
1972	91.4 mm (3.6 in)
1973	100.8 mm (4.0 in)
1974	34.0 mm (1.3 in)
1975	32.3 mm (1.3 in)
1976	46.2 mm (1.8 in)
1977	73.4 mm (2.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Merrill 4 WSW, 1941 to 1977. The record is 139.2 mm (5.5 in) in 1953, marked on the chart; the median year is 87.6 mm (3.4 in).

Wettest five days (Rx5day) at Merrill 4 WSW by year
Year	Wettest five days (Rx5day)
1941	32.5 mm (1.3 in)
1948	85.5 mm (3.4 in)
1949	129.8 mm (5.1 in)
1950	92.9 mm (3.7 in)
1951	98.0 mm (3.9 in)
1952	96.7 mm (3.8 in)
1953	139.2 mm (5.5 in)
1954	68.0 mm (2.7 in)
1955	80.2 mm (3.2 in)
1956	32.8 mm (1.3 in)
1957	76.4 mm (3.0 in)
1958	87.6 mm (3.4 in)
1959	88.9 mm (3.5 in)
1960	95.4 mm (3.8 in)
1961	75.2 mm (3.0 in)
1962	80.6 mm (3.2 in)
1963	54.6 mm (2.1 in)
1964	85.2 mm (3.4 in)
1965	102.4 mm (4.0 in)
1966	91.0 mm (3.6 in)
1967	71.8 mm (2.8 in)
1968	134.1 mm (5.3 in)
1969	108.2 mm (4.3 in)
1970	95.8 mm (3.8 in)
1971	114.3 mm (4.5 in)
1972	112.7 mm (4.4 in)
1973	100.8 mm (4.0 in)
1974	76.0 mm (3.0 in)
1975	39.1 mm (1.5 in)
1976	80.5 mm (3.2 in)
1977	74.4 mm (2.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Merrill 4 WSW, 1941 to 1977. The record is 70 days in 1976, marked on the chart; the median year is 31 days.

Longest dry spell (CDD) at Merrill 4 WSW by year
Year	Longest dry spell (CDD)
1941	10 days
1948	23 days
1949	51 days
1950	24 days
1951	17 days
1952	64 days
1953	24 days
1954	25 days
1955	20 days
1956	41 days
1957	29 days
1958	37 days
1959	24 days
1960	36 days
1961	31 days
1962	53 days
1963	37 days
1964	45 days
1965	23 days
1966	51 days
1967	28 days
1968	38 days
1969	24 days
1970	39 days
1971	31 days
1972	25 days
1973	27 days
1974	31 days
1975	41 days
1976	70 days
1977	24 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.

Download the Data

Data for Merrill 4 WSW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Merrill 4 WSW 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 2026-10-16 (16 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).