Grand Haven Wwtp Weather Records (USC00203295)

Record envelope, standing records and threshold days for Grand Haven Wwtp (USC00203295), Michigan, United States, with 79 years of record.

Key Facts for Grand Haven Wwtp

Grand Haven Wwtp (USC00203295) is a weather station in Michigan, United States at 43.06 latitude and -86.20 longitude, 183 m (600 ft) above sea level.
The station reports from 1948 to 2026, 79 years of record.
1,464 records set at Grand Haven Wwtp still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Michigan, United States, 43.06 latitude, -86.20 longitude.
Elevation: 183 m (600 ft).
Period of record: 1948 to 2026, 79 years.
Eligible elements: none yet.

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 Grand Haven Wwtp. 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 Grand Haven Wwtp, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	17.2 C (63.0 F)	-22.8 C (-9.0 F)	n/a	n/a
Feb	17.2 C (63.0 F)	-25.0 C (-13.0 F)	n/a	n/a
Mar	27.8 C (82.0 F)	-22.8 C (-9.0 F)	n/a	n/a
Apr	26.7 C (80.1 F)	-9.4 C (15.1 F)	n/a	n/a
May	35.0 C (95.0 F)	-2.8 C (27.0 F)	n/a	n/a
Jun	36.7 C (98.1 F)	4.4 C (39.9 F)	n/a	n/a
Jul	35.6 C (96.1 F)	6.7 C (44.1 F)	n/a	n/a
Aug	33.9 C (93.0 F)	5.0 C (41.0 F)	n/a	n/a
Sep	33.3 C (91.9 F)	3.3 C (37.9 F)	n/a	n/a
Oct	28.3 C (82.9 F)	-3.3 C (26.1 F)	n/a	n/a
Nov	22.8 C (73.0 F)	-8.9 C (16.0 F)	n/a	n/a
Dec	18.3 C (64.9 F)	-14.4 C (6.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Grand Haven Wwtp still stand. 2014 holds the most, with 142.

Wettest Day of Each Month

May: 101.6 mm (4.0 in)

The wettest day on record for each calendar month at Grand Haven Wwtp. The most was 101.6 mm (4.0 in) on 18 May 2020.

Record daily precipitation for each month at Grand Haven Wwtp
Month	Record daily precipitation (mm)	Date
Jan	43.2 mm (1.7 in)	30 January 2013
Feb	46.0 mm (1.8 in)	27 February 2009
Mar	40.6 mm (1.6 in)	31 March 2022
Apr	67.1 mm (2.6 in)	10 April 2015
May	101.6 mm (4.0 in)	18 May 2020
Jun	71.1 mm (2.8 in)	18 June 2014
Jul	90.2 mm (3.6 in)	29 July 1949
Aug	74.9 mm (2.9 in)	15 August 2023
Sep	81.3 mm (3.2 in)	5 September 2008
Oct	59.2 mm (2.3 in)	24 October 2017
Nov	40.6 mm (1.6 in)	27 November 2011
Dec	45.7 mm (1.8 in)	2 December 1950

Period of Record Coverage

2008 to 2023

16 years of record at Grand Haven Wwtp, 2008 to 2023. 4 years have data for under 90 percent of days and are left out of rankings: 2008, 2020, 2022, 2023.

Days with data per year at Grand Haven Wwtp
Year	Days with data	Share of year	Complete
2008	183	50%	No
2009	360	99%	Yes
2010	363	99%	Yes
2011	359	98%	Yes
2012	363	99%	Yes
2013	361	99%	Yes
2014	365	100%	Yes
2015	361	99%	Yes
2016	358	98%	Yes
2017	360	99%	Yes
2018	358	98%	Yes
2019	343	94%	Yes
2020	284	78%	No
2021	332	91%	Yes
2022	327	90%	No
2023	228	62%	No

Latest Records

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

Extremes by Year

1948 to 2026

Yearly extremes at Grand Haven Wwtp: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	36.7 C (98.1 F)	2023	32.5 C (90.5 F)	16
Coldest night (TNn)	-25.0 C (-13.0 F)	2015	-16.7 C (1.9 F)	16
Wettest day (Rx1day)	101.6 mm (4.0 in)	2020	59.9 mm (2.4 in)	23
Wettest five days (Rx5day)	141.8 mm (5.6 in)	2021	89.4 mm (3.5 in)	23
Longest dry spell (CDD)	29 days	1949	18 days	23

Hottest day (TXx)

The hottest day of the year at Grand Haven Wwtp, 1948 to 2026. The record is 36.7 C (98.1 F) in 2023, marked on the chart; the median year is 32.5 C (90.5 F).

Hottest day (TXx) at Grand Haven Wwtp by year
Year	Hottest day (TXx)
1948	n/a
1949	n/a
1950	n/a
1951	n/a
2008	30.0 C (86.0 F)
2009	32.2 C (90.0 F)
2010	31.1 C (88.0 F)
2011	33.3 C (91.9 F)
2012	35.6 C (96.1 F)
2013	32.8 C (91.0 F)
2014	30.6 C (87.1 F)
2015	31.1 C (88.0 F)
2016	31.7 C (89.1 F)
2017	33.3 C (91.9 F)
2018	35.0 C (95.0 F)
2019	31.1 C (88.0 F)
2020	33.9 C (93.0 F)
2021	31.1 C (88.0 F)
2022	32.8 C (91.0 F)
2023	36.7 C (98.1 F)
2024	n/a
2025	n/a
2026	n/a

Coldest night (TNn)

The coldest night of the year at Grand Haven Wwtp, 1948 to 2026. The record is -25.0 C (-13.0 F) in 2015, marked on the chart; the median year is -16.7 C (1.9 F).

Coldest night (TNn) at Grand Haven Wwtp by year
Year	Coldest night (TNn)
1948	n/a
1949	n/a
1950	n/a
1951	n/a
2008	-14.4 C (6.1 F)
2009	-18.9 C (-2.0 F)
2010	-16.7 C (1.9 F)
2011	-22.8 C (-9.0 F)
2012	-12.8 C (9.0 F)
2013	-16.7 C (1.9 F)
2014	-22.8 C (-9.0 F)
2015	-25.0 C (-13.0 F)
2016	-13.9 C (7.0 F)
2017	-7.2 C (19.0 F)
2018	-6.1 C (21.0 F)
2019	-20.6 C (-5.1 F)
2020	-13.9 C (7.0 F)
2021	-20.6 C (-5.1 F)
2022	-16.7 C (1.9 F)
2023	-12.8 C (9.0 F)
2024	n/a
2025	n/a
2026	n/a

Wettest day (Rx1day)

The wettest day of the year at Grand Haven Wwtp, 1948 to 2026. The record is 101.6 mm (4.0 in) in 2020, marked on the chart; the median year is 59.9 mm (2.4 in).

Wettest day (Rx1day) at Grand Haven Wwtp by year
Year	Wettest day (Rx1day)
1948	45.0 mm (1.8 in)
1949	90.2 mm (3.6 in)
1950	48.5 mm (1.9 in)
1951	23.9 mm (0.9 in)
2008	83.6 mm (3.3 in)
2009	63.5 mm (2.5 in)
2010	54.6 mm (2.1 in)
2011	66.0 mm (2.6 in)
2012	32.5 mm (1.3 in)
2013	62.7 mm (2.5 in)
2014	71.1 mm (2.8 in)
2015	67.1 mm (2.6 in)
2016	67.3 mm (2.6 in)
2017	59.2 mm (2.3 in)
2018	59.9 mm (2.4 in)
2019	49.5 mm (1.9 in)
2020	101.6 mm (4.0 in)
2021	50.8 mm (2.0 in)
2022	50.8 mm (2.0 in)
2023	74.9 mm (2.9 in)
2024	49.5 mm (1.9 in)
2025	44.5 mm (1.8 in)
2026	72.4 mm (2.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Grand Haven Wwtp, 1948 to 2026. The record is 141.8 mm (5.6 in) in 2021, marked on the chart; the median year is 89.4 mm (3.5 in).

Wettest five days (Rx5day) at Grand Haven Wwtp by year
Year	Wettest five days (Rx5day)
1948	46.3 mm (1.8 in)
1949	103.7 mm (4.1 in)
1950	86.9 mm (3.4 in)
1951	45.3 mm (1.8 in)
2008	89.4 mm (3.5 in)
2009	78.5 mm (3.1 in)
2010	64.5 mm (2.5 in)
2011	74.4 mm (2.9 in)
2012	74.2 mm (2.9 in)
2013	109.2 mm (4.3 in)
2014	106.7 mm (4.2 in)
2015	99.4 mm (3.9 in)
2016	85.1 mm (3.4 in)
2017	118.6 mm (4.7 in)
2018	130.8 mm (5.1 in)
2019	110.1 mm (4.3 in)
2020	104.1 mm (4.1 in)
2021	141.8 mm (5.6 in)
2022	74.4 mm (2.9 in)
2023	94.8 mm (3.7 in)
2024	68.3 mm (2.7 in)
2025	61.4 mm (2.4 in)
2026	98.3 mm (3.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Grand Haven Wwtp, 1948 to 2026. The record is 29 days in 1949, marked on the chart; the median year is 18 days.

Longest dry spell (CDD) at Grand Haven Wwtp by year
Year	Longest dry spell (CDD)
1948	18 days
1949	29 days
1950	22 days
1951	15 days
2008	26 days
2009	18 days
2010	18 days
2011	16 days
2012	29 days
2013	14 days
2014	18 days
2015	20 days
2016	12 days
2017	19 days
2018	15 days
2019	13 days
2020	14 days
2021	14 days
2022	24 days
2023	21 days
2024	18 days
2025	15 days
2026	21 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 Grand Haven Wwtp standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Grand Haven Wwtp 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).