Mercer Rs Weather Records (USC00475352)

Record envelope, standing records and threshold days for Mercer Rs (USC00475352), Wisconsin, United States, with 87 years of record.

Key Facts for Mercer Rs

Mercer Rs (USC00475352) is a weather station in Wisconsin, United States at 46.17 latitude and -90.07 longitude, 488 m (1,600 ft) above sea level.
The station reports from 1940 to 2026, 87 years of record.
1,464 records set at Mercer Rs still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Wisconsin, United States, 46.17 latitude, -90.07 longitude.
Elevation: 488 m (1,600 ft).
Period of record: 1940 to 2026, 87 years.
Eligible elements: none yet.

Daily Record Envelope and 2026

48 days at or beyond a record

The band shows the record high and record low for each calendar day at Mercer Rs. The lines show the 2026 daily maximum and minimum. 48 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Mercer Rs, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	13.3 C (55.9 F)	-36.1 C (-33.0 F)	5.0 C (41.0 F)	-33.3 C (-27.9 F)
Feb	18.9 C (66.0 F)	-37.2 C (-35.0 F)	9.4 C (48.9 F)	-29.4 C (-20.9 F)
Mar	24.4 C (75.9 F)	-37.8 C (-36.0 F)	17.8 C (64.0 F)	-24.4 C (-11.9 F)
Apr	25.0 C (77.0 F)	-18.9 C (-2.0 F)	18.9 C (66.0 F)	-14.4 C (6.1 F)
May	31.7 C (89.1 F)	-7.2 C (19.0 F)	29.4 C (84.9 F)	-1.7 C (28.9 F)
Jun	33.3 C (91.9 F)	-6.1 C (21.0 F)	32.8 C (91.0 F)	1.7 C (35.1 F)
Jul	33.9 C (93.0 F)	-1.7 C (28.9 F)	32.2 C (90.0 F)	7.8 C (46.0 F)
Aug	35.0 C (95.0 F)	-0.6 C (30.9 F)	30.0 C (86.0 F)	5.0 C (41.0 F)
Sep	31.1 C (88.0 F)	-12.8 C (9.0 F)	28.3 C (82.9 F)	3.3 C (37.9 F)
Oct	28.3 C (82.9 F)	-11.7 C (10.9 F)	28.3 C (82.9 F)	-1.7 C (28.9 F)
Nov	20.6 C (69.1 F)	-25.0 C (-13.0 F)	15.0 C (59.0 F)	-11.7 C (10.9 F)
Dec	12.2 C (54.0 F)	-35.0 C (-31.0 F)	3.3 C (37.9 F)	-26.1 C (-15.0 F)

Which Years Hold Standing Records

1,464 standing records

1,464 records at Mercer Rs still stand. 1942 holds the most, with 133.

Standing records at Mercer Rs by the year they were set
Year set	Standing records
1940	70
1941	97
1942	133
1943	87
1944	63
1945	100
1946	51
1947	107
2009	27
2010	79
2011	69
2012	79
2013	79
2014	119
2015	75
2016	55
2019	9
2020	6
2023	8
2024	63
2025	88

Wettest Day of Each Month

Jul: 153.2 mm (6.0 in)

The wettest day on record for each calendar month at Mercer Rs. The most was 153.2 mm (6.0 in) on 17 July 1942.

Record daily precipitation for each month at Mercer Rs
Month	Record daily precipitation (mm)	Date
Jan	28.4 mm (1.1 in)	1 January 2020
Feb	45.7 mm (1.8 in)	16 February 1945
Mar	30.5 mm (1.2 in)	17 March 2016
Apr	40.1 mm (1.6 in)	23 April 1945
May	57.4 mm (2.3 in)	9 May 2014
Jun	94.5 mm (3.7 in)	24 June 1946
Jul	153.2 mm (6.0 in)	17 July 1942
Aug	57.4 mm (2.3 in)	22 August 2016
Sep	81.8 mm (3.2 in)	24 September 2010
Oct	38.4 mm (1.5 in)	25 October 2012
Nov	42.7 mm (1.7 in)	11 November 2014
Dec	26.9 mm (1.1 in)	15 December 2015

Period of Record Coverage

1940 to 2025

21 years of record at Mercer Rs, 1940 to 2025. 14 years have data for under 90 percent of days and are left out of rankings: 1940, 1941, 1943, 1944, 1945, 1946, 2009, 2012 and others.

Days with data per year at Mercer Rs
Year	Days with data	Share of year	Complete
1940	284	78%	No
1941	268	73%	No
1942	356	98%	Yes
1943	312	85%	No
1944	256	70%	No
1945	328	90%	No
1946	254	70%	No
1947	352	96%	Yes
2009	84	23%	No
2010	364	100%	Yes
2011	359	98%	Yes
2012	329	90%	No
2013	312	85%	No
2014	355	97%	Yes
2015	365	100%	Yes
2016	302	83%	No
2019	27	7%	No
2020	60	16%	No
2023	37	10%	No
2024	214	58%	No
2025	365	100%	Yes

Latest Records

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

Extremes by Year

1940 to 2026

Yearly extremes at Mercer Rs: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	35.6 C (96.1 F)	2026	32.2 C (90.0 F)	23
Coldest night (TNn)	-37.8 C (-36.0 F)	1943	-33.3 C (-27.9 F)	23
Wettest day (Rx1day)	153.2 mm (6.0 in)	1942	50.5 mm (2.0 in)	27
Wettest five days (Rx5day)	217.8 mm (8.6 in)	1949	65.1 mm (2.6 in)	25
Longest dry spell (CDD)	30 days	1945	14 days	26

Hottest day (TXx)

The hottest day of the year at Mercer Rs, 1940 to 2026. The record is 35.6 C (96.1 F) in 2026, marked on the chart; the median year is 32.2 C (90.0 F).

Hottest day (TXx) at Mercer Rs by year
Year	Hottest day (TXx)
1940	32.8 C (91.0 F)
1941	32.2 C (90.0 F)
1942	32.8 C (91.0 F)
1943	35.0 C (95.0 F)
1944	31.7 C (89.1 F)
1945	32.8 C (91.0 F)
1946	30.6 C (87.1 F)
1947	35.0 C (95.0 F)
1948	n/a
1949	n/a
1950	n/a
1951	n/a
2009	17.2 C (63.0 F)
2010	31.7 C (89.1 F)
2011	33.9 C (93.0 F)
2012	32.8 C (91.0 F)
2013	32.8 C (91.0 F)
2014	30.0 C (86.0 F)
2015	31.1 C (88.0 F)
2016	31.1 C (88.0 F)
2018	26.7 C (80.1 F)
2019	6.7 C (44.1 F)
2020	8.9 C (48.0 F)
2023	17.8 C (64.0 F)
2024	32.8 C (91.0 F)
2025	32.8 C (91.0 F)
2026	35.6 C (96.1 F)

Coldest night (TNn)

The coldest night of the year at Mercer Rs, 1940 to 2026. The record is -37.8 C (-36.0 F) in 1943, marked on the chart; the median year is -33.3 C (-27.9 F).

Coldest night (TNn) at Mercer Rs by year
Year	Coldest night (TNn)
1940	-35.0 C (-31.0 F)
1941	-22.2 C (-8.0 F)
1942	-37.2 C (-35.0 F)
1943	-37.8 C (-36.0 F)
1944	-33.3 C (-27.9 F)
1945	-35.0 C (-31.0 F)
1946	-35.6 C (-32.1 F)
1947	-33.3 C (-27.9 F)
1948	n/a
1949	n/a
1950	n/a
1951	n/a
2009	-27.8 C (-18.0 F)
2010	-28.9 C (-20.0 F)
2011	-30.6 C (-23.1 F)
2012	-30.6 C (-23.1 F)
2013	-33.3 C (-27.9 F)
2014	-35.0 C (-31.0 F)
2015	-34.4 C (-29.9 F)
2016	-31.1 C (-24.0 F)
2018	13.3 C (55.9 F)
2019	-36.1 C (-33.0 F)
2020	-31.7 C (-25.1 F)
2023	-15.6 C (3.9 F)
2024	-26.7 C (-16.1 F)
2025	-33.3 C (-27.9 F)
2026	-36.1 C (-33.0 F)

Wettest day (Rx1day)

The wettest day of the year at Mercer Rs, 1940 to 2026. The record is 153.2 mm (6.0 in) in 1942, marked on the chart; the median year is 50.5 mm (2.0 in).

Wettest day (Rx1day) at Mercer Rs by year
Year	Wettest day (Rx1day)
1940	50.5 mm (2.0 in)
1941	52.1 mm (2.1 in)
1942	153.2 mm (6.0 in)
1943	34.3 mm (1.4 in)
1944	52.8 mm (2.1 in)
1945	45.7 mm (1.8 in)
1946	94.5 mm (3.7 in)
1947	43.9 mm (1.7 in)
1948	57.2 mm (2.3 in)
1949	137.9 mm (5.4 in)
1950	55.1 mm (2.2 in)
1951	37.6 mm (1.5 in)
2009	14.5 mm (0.6 in)
2010	81.8 mm (3.2 in)
2011	40.4 mm (1.6 in)
2012	63.8 mm (2.5 in)
2013	54.9 mm (2.2 in)
2014	57.4 mm (2.3 in)
2015	42.9 mm (1.7 in)
2016	67.6 mm (2.7 in)
2018	39.9 mm (1.6 in)
2019	8.1 mm (0.32 in)
2020	28.4 mm (1.1 in)
2023	2.0 mm (0.08 in)
2024	42.4 mm (1.7 in)
2025	48.8 mm (1.9 in)
2026	56.4 mm (2.2 in)

Wettest five days (Rx5day)

The wettest five days of the year at Mercer Rs, 1940 to 2026. The record is 217.8 mm (8.6 in) in 1949, marked on the chart; the median year is 65.1 mm (2.6 in).

Wettest five days (Rx5day) at Mercer Rs by year
Year	Wettest five days (Rx5day)
1940	44.9 mm (1.8 in)
1941	65.1 mm (2.6 in)
1942	67.7 mm (2.7 in)
1943	60.3 mm (2.4 in)
1944	74.4 mm (2.9 in)
1945	80.2 mm (3.2 in)
1946	117.4 mm (4.6 in)
1947	47.2 mm (1.9 in)
1948	59.0 mm (2.3 in)
1949	217.8 mm (8.6 in)
1950	85.5 mm (3.4 in)
1951	81.8 mm (3.2 in)
2009	12.7 mm (0.5 in)
2010	97.6 mm (3.8 in)
2011	83.6 mm (3.3 in)
2012	50.6 mm (2.0 in)
2013	106.5 mm (4.2 in)
2014	81.0 mm (3.2 in)
2015	50.3 mm (2.0 in)
2016	83.3 mm (3.3 in)
2018	n/a
2019	10.2 mm (0.4 in)
2020	28.4 mm (1.1 in)
2023	n/a
2024	27.2 mm (1.1 in)
2025	31.7 mm (1.2 in)
2026	6.1 mm (0.24 in)

Longest dry spell (CDD)

The longest dry spell of the year at Mercer Rs, 1940 to 2026. The record is 30 days in 1945, marked on the chart; the median year is 14 days.

Longest dry spell (CDD) at Mercer Rs by year
Year	Longest dry spell (CDD)
1940	11 days
1941	14 days
1942	19 days
1943	3 days
1944	15 days
1945	30 days
1946	13 days
1947	21 days
1948	22 days
1949	16 days
1950	14 days
1951	18 days
2009	14 days
2010	21 days
2011	16 days
2012	13 days
2013	13 days
2014	13 days
2015	16 days
2016	18 days
2018	n/a
2019	12 days
2020	12 days
2023	3 days
2024	6 days
2025	10 days
2026	4 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 Mercer Rs standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Mercer Rs 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 2026-10-12 (12 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).