Bay City Weather Records (USC00200568)

Record envelope, standing records and threshold days for Bay City (USC00200568), Michigan, United States, with 83 years of record.

Key Facts for Bay City

Bay City (USC00200568) is a weather station in Michigan, United States at 43.62 latitude and -83.87 longitude, 180 m (591 ft) above sea level.
The station reports from 1896 to 1978, 83 years of record.
1,464 records set at Bay City still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Bay City tied a daily record high maximum temperature of 32.2 C (90.0 F) on 20 September 1978.

About the Station

Location: Michigan, United States, 43.62 latitude, -83.87 longitude.
Elevation: 180 m (591 ft).
Period of record: 1896 to 1978, 83 years.
Eligible elements: tmax, tmin, 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 Bay City. 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 Bay City, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	16.7 C (62.1 F)	-30.6 C (-23.1 F)	n/a	n/a
Feb	16.7 C (62.1 F)	-35.0 C (-31.0 F)	n/a	n/a
Mar	27.8 C (82.0 F)	-26.1 C (-15.0 F)	n/a	n/a
Apr	31.7 C (89.1 F)	-15.0 C (5.0 F)	n/a	n/a
May	35.6 C (96.1 F)	-5.6 C (21.9 F)	n/a	n/a
Jun	38.9 C (102.0 F)	-0.6 C (30.9 F)	n/a	n/a
Jul	43.3 C (109.9 F)	4.4 C (39.9 F)	n/a	n/a
Aug	39.4 C (102.9 F)	2.8 C (37.0 F)	n/a	n/a
Sep	37.2 C (99.0 F)	-3.3 C (26.1 F)	n/a	n/a
Oct	30.6 C (87.1 F)	-9.4 C (15.1 F)	n/a	n/a
Nov	25.6 C (78.1 F)	-17.8 C (0.0 F)	n/a	n/a
Dec	20.0 C (68.0 F)	-26.1 C (-15.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Bay City still stand. 1912 holds the most, with 40.

Standing records at Bay City by the year they were set
Year set	Standing records
1896	26
1897	13
1898	14
1899	32
1900	25
1901	13
1902	15
1903	28
1904	19
1905	16
1906	14
1907	21
1908	10
1909	20
1910	19
1911	28
1912	40
1913	19
1914	10
1915	21
1916	20
1917	27
1918	36
1919	27
1920	26
1921	23
1922	11
1923	32
1924	20
1925	26
1926	16
1927	20
1928	17
1929	20
1930	18
1931	29
1932	18
1933	27
1934	17
1935	14
1936	28
1937	11
1938	8
1939	12
1940	13
1941	17
1942	18
1943	17
1944	17
1945	27
1946	15
1947	16
1948	13
1949	21
1950	16
1951	19
1952	10
1953	22
1954	8
1955	8
1956	11
1957	11
1958	8
1959	12
1960	10
1961	4
1962	18
1963	9
1964	24
1965	24
1966	13
1967	14
1968	12
1969	10
1970	5
1971	16
1972	12
1973	10
1974	18
1975	8
1976	17
1977	31
1978	4

Wettest Day of Each Month

Aug: 152.4 mm (6.0 in)

The wettest day on record for each calendar month at Bay City. The most was 152.4 mm (6.0 in) on 8 August 1913.

Record daily precipitation for each month at Bay City
Month	Record daily precipitation (mm)	Date
Jan	61.0 mm (2.4 in)	30 January 1914
Feb	45.7 mm (1.8 in)	21 February 1912
Mar	68.6 mm (2.7 in)	12 March 1902
Apr	58.7 mm (2.3 in)	17 April 1967
May	74.9 mm (2.9 in)	13 May 1937
Jun	91.9 mm (3.6 in)	17 June 1937
Jul	130.3 mm (5.1 in)	13 July 1897
Aug	152.4 mm (6.0 in)	8 August 1913
Sep	55.9 mm (2.2 in)	20 September 1957
Oct	73.7 mm (2.9 in)	3 October 1954
Nov	53.3 mm (2.1 in)	12 November 1911
Dec	45.7 mm (1.8 in)	3 December 1902

Period of Record Coverage

1896 to 1978

83 years of record at Bay City, 1896 to 1978. 8 years have data for under 90 percent of days and are left out of rankings: 1896, 1897, 1902, 1914, 1915, 1973, 1977, 1978.

Days with data per year at Bay City
Year	Days with data	Share of year	Complete
1896	264	72%	No
1897	260	71%	No
1898	353	97%	Yes
1899	354	97%	Yes
1900	363	99%	Yes
1901	331	91%	Yes
1902	317	87%	No
1903	340	93%	Yes
1904	358	98%	Yes
1905	356	98%	Yes
1906	344	94%	Yes
1907	362	99%	Yes
1908	366	100%	Yes
1909	348	95%	Yes
1910	363	99%	Yes
1911	348	95%	Yes
1912	349	95%	Yes
1913	363	99%	Yes
1914	279	76%	No
1915	326	89%	No
1916	363	99%	Yes
1917	362	99%	Yes
1918	347	95%	Yes
1919	329	90%	Yes
1920	364	99%	Yes
1921	364	100%	Yes
1922	365	100%	Yes
1923	360	99%	Yes
1924	363	99%	Yes
1925	365	100%	Yes
1926	365	100%	Yes
1927	365	100%	Yes
1928	364	99%	Yes
1929	360	99%	Yes
1930	336	92%	Yes
1931	364	100%	Yes
1932	365	100%	Yes
1933	361	99%	Yes
1934	360	99%	Yes
1935	360	99%	Yes
1936	365	100%	Yes
1937	364	100%	Yes
1938	362	99%	Yes
1939	362	99%	Yes
1940	356	97%	Yes
1941	364	100%	Yes
1942	363	99%	Yes
1943	360	99%	Yes
1944	363	99%	Yes
1945	361	99%	Yes
1946	363	99%	Yes
1947	362	99%	Yes
1948	365	100%	Yes
1949	360	99%	Yes
1950	364	100%	Yes
1951	364	100%	Yes
1952	366	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	365	100%	Yes
1956	366	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	364	100%	Yes
1960	366	100%	Yes
1961	365	100%	Yes
1962	364	100%	Yes
1963	361	99%	Yes
1964	366	100%	Yes
1965	364	100%	Yes
1966	364	100%	Yes
1967	363	99%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	364	100%	Yes
1972	332	91%	Yes
1973	318	87%	No
1974	349	96%	Yes
1975	348	95%	Yes
1976	356	97%	Yes
1977	321	88%	No
1978	292	80%	No

Latest Records

Latest records at Bay City
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 September 1978	Bay City, US	daily high max (Tie)	32.2 C (90.0 F)	tie	47 years	5 of 100 (Routine)
30 July 1978	Bay City, US	daily low max	18.9 C (66.0 F)	2.8 C (5.0 F)	65 years	34 of 100 (Routine)
14 June 1978	Bay City, US	daily low min	3.9 C (39.0 F)	1.1 C (2.0 F)	44 years	23 of 100 (Routine)
13 June 1978	Bay City, US	daily low min	4.4 C (39.9 F)	1.2 C (2.2 F)	44 years	23 of 100 (Routine)
30 May 1978	Bay City, US	daily rain	55.1 mm (2.2 in)	17.0 mm (0.7 in)	69 years	46 of 100 (Notable)
26 May 1978	Bay City, US	daily high max	32.2 C (90.0 F)	0.5 C (0.9 F)	33 years	18 of 100 (Routine)
26 January 1978	Bay City, US	daily rain	30.5 mm (1.2 in)	11.4 mm (0.4 in)	70 years	46 of 100 (Notable)
25 December 1977	Bay City, US	daily low min	-20.6 C (-5.1 F)	1.2 C (2.2 F)	52 years	25 of 100 (Routine)
10 December 1977	Bay City, US	daily low max (Tie)	-7.2 C (19.0 F)	tie	44 years	5 of 100 (Routine)
8 December 1977	Bay City, US	daily snowfall	12.7 cm (5.0 in)	1.3 cm (0.5 in)	48 years	24 of 100 (Routine)
29 November 1977	Bay City, US	daily low min	-16.1 C (3.0 F)	1.1 C (2.0 F)	48 years	24 of 100 (Routine)
28 November 1977	Bay City, US	daily low min	-15.6 C (3.9 F)	1.2 C (2.2 F)	22 years	16 of 100 (Routine)
25 November 1977	Bay City, US	daily rain	26.9 mm (1.1 in)	11.7 mm (0.5 in)	24 years	29 of 100 (Routine)
9 November 1977	Bay City, US	daily high min	12.2 C (54.0 F)	1.6 C (2.9 F)	2 years	11 of 100 (Routine)
17 October 1977	Bay City, US	daily low min	-2.8 C (27.0 F)	0.6 C (1.1 F)	75 years	31 of 100 (Routine)
16 October 1977	Bay City, US	daily low max	6.1 C (43.0 F)	0.6 C (1.1 F)	34 years	19 of 100 (Routine)
29 August 1977	Bay City, US	daily high min	22.2 C (72.0 F)	1.6 C (2.9 F)	56 years	27 of 100 (Routine)
29 August 1977	Bay City, US	daily rain	48.8 mm (1.9 in)	4.3 mm (0.17 in)	2 years	11 of 100 (Routine)
20 July 1977	Bay City, US	daily high max	36.7 C (98.1 F)	1.1 C (2.0 F)	60 years	28 of 100 (Routine)
20 July 1977	Bay City, US	daily high min	23.9 C (75.0 F)	0.6 C (1.1 F)	36 years	20 of 100 (Routine)

Climate Trend

67 complete years, 1898 to 1976

One stripe for each of 67 complete years at Bay City, 1898 to 1976. Blue stripes are years cooler than the station's own mean of 8.6 C (47.5 F); red stripes are warmer. The coolest year was 1904, at 6.3 C (43.4 F), and the warmest was 1931, at 10.7 C (51.3 F). The strongest colour marks a difference of 2.3 C (4.1 F).

Annual mean temperature at Bay City as warming stripes, 1898 to 1976
Year	Annual mean temperature	Difference from the station mean
1898	8.1 C	-0.56 C
1900	8.6 C	-0.05 C
1903	7.7 C	-0.95 C
1904	6.3 C	-2.27 C
1905	7.5 C	-1.13 C
1906	8.5 C	-0.09 C
1907	7.0 C	-1.65 C
1908	8.5 C	-0.12 C
1910	8.5 C	-0.16 C
1911	8.6 C	-0.04 C
1913	9.3 C	+0.68 C
1916	8.0 C	-0.63 C
1917	6.5 C	-2.12 C
1920	7.9 C	-0.69 C
1921	10.6 C	+1.94 C
1922	9.0 C	+0.43 C
1923	8.0 C	-0.58 C
1924	7.0 C	-1.59 C
1925	7.9 C	-0.71 C
1926	7.1 C	-1.54 C
1927	8.6 C	+0.03 C
1928	8.7 C	+0.09 C
1929	7.5 C	-1.11 C
1931	10.7 C	+2.09 C
1932	8.9 C	+0.27 C
1933	9.2 C	+0.58 C
1934	8.9 C	+0.32 C
1935	8.7 C	+0.04 C
1936	8.6 C	-0.01 C
1937	8.5 C	-0.09 C
1938	9.6 C	+0.96 C
1939	9.5 C	+0.92 C
1940	8.1 C	-0.51 C
1941	10.2 C	+1.56 C
1942	9.1 C	+0.53 C
1943	8.3 C	-0.32 C
1944	9.5 C	+0.90 C
1945	8.8 C	+0.14 C
1946	9.5 C	+0.84 C
1947	8.8 C	+0.22 C
1948	9.5 C	+0.84 C
1949	10.3 C	+1.73 C
1950	8.5 C	-0.08 C
1951	8.6 C	-0.01 C
1952	10.1 C	+1.49 C
1953	10.6 C	+1.99 C
1954	9.6 C	+1.03 C
1955	10.3 C	+1.67 C
1956	9.1 C	+0.47 C
1957	9.4 C	+0.77 C
1958	8.8 C	+0.21 C
1959	9.0 C	+0.37 C
1960	8.2 C	-0.44 C
1961	8.6 C	+0.01 C
1962	8.0 C	-0.63 C
1963	7.9 C	-0.72 C
1964	8.7 C	+0.13 C
1965	7.5 C	-1.08 C
1966	7.6 C	-0.97 C
1967	7.6 C	-1.01 C
1968	8.6 C	+0.00 C
1969	8.2 C	-0.42 C
1970	8.2 C	-0.42 C
1971	8.3 C	-0.27 C
1974	8.3 C	-0.34 C
1975	9.3 C	+0.65 C
1976	7.7 C	-0.88 C

The fitted trend in annual mean temperature here over 1898 to 1976 is 0.09 C (-0.01 to 0.20) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.17 F (-0.02 to 0.36) per decade. The slope is a straight line fitted to 67 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Bay City
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.09 C (-0.01 to 0.20) per decade	0.17 F (-0.02 to 0.36) per decade	1898 to 1976	67	Not clearly different from zero
Mean daily maximum	-0.04 C (-0.15 to 0.08) per decade	-0.1 F (-0.3 to 0.1) per decade	1898 to 1976	67	Not clearly different from zero
Mean daily minimum	0.2 C (0.1 to 0.3) per decade	0.4 F (0.2 to 0.6) per decade	1898 to 1976	67	Rise

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1896 to 1978

Yearly extremes at Bay City: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	43.3 C (109.9 F)	1911	35.6 C (96.1 F)	83
Coldest night (TNn)	-35.0 C (-31.0 F)	1918	-22.2 C (-8.0 F)	83
Wettest day (Rx1day)	152.4 mm (6.0 in)	1913	48.3 mm (1.9 in)	83
Wettest five days (Rx5day)	173.0 mm (6.8 in)	1913	69.4 mm (2.7 in)	83
Longest dry spell (CDD)	39 days	1900	20 days	83

Hottest day (TXx)

The hottest day of the year at Bay City, 1896 to 1978. The record is 43.3 C (109.9 F) in 1911, marked on the chart; the median year is 35.6 C (96.1 F).

Hottest day (TXx) at Bay City by year
Year	Hottest day (TXx)
1896	35.6 C (96.1 F)
1897	37.8 C (100.0 F)
1898	34.4 C (93.9 F)
1899	34.4 C (93.9 F)
1900	37.2 C (99.0 F)
1901	36.7 C (98.1 F)
1902	32.8 C (91.0 F)
1903	35.0 C (95.0 F)
1904	36.1 C (97.0 F)
1905	35.0 C (95.0 F)
1906	35.0 C (95.0 F)
1907	35.0 C (95.0 F)
1908	36.1 C (97.0 F)
1909	35.0 C (95.0 F)
1910	38.3 C (100.9 F)
1911	43.3 C (109.9 F)
1912	35.0 C (95.0 F)
1913	37.2 C (99.0 F)
1914	36.1 C (97.0 F)
1915	31.7 C (89.1 F)
1916	40.0 C (104.0 F)
1917	37.2 C (99.0 F)
1918	39.4 C (102.9 F)
1919	36.7 C (98.1 F)
1920	33.3 C (91.9 F)
1921	37.8 C (100.0 F)
1922	35.6 C (96.1 F)
1923	36.1 C (97.0 F)
1924	34.4 C (93.9 F)
1925	36.1 C (97.0 F)
1926	36.7 C (98.1 F)
1927	36.7 C (98.1 F)
1928	35.0 C (95.0 F)
1929	35.6 C (96.1 F)
1930	38.3 C (100.9 F)
1931	38.3 C (100.9 F)
1932	35.0 C (95.0 F)
1933	37.2 C (99.0 F)
1934	41.1 C (106.0 F)
1935	37.2 C (99.0 F)
1936	42.8 C (109.0 F)
1937	35.6 C (96.1 F)
1938	35.0 C (95.0 F)
1939	37.2 C (99.0 F)
1940	37.8 C (100.0 F)
1941	37.8 C (100.0 F)
1942	35.6 C (96.1 F)
1943	34.4 C (93.9 F)
1944	37.2 C (99.0 F)
1945	33.9 C (93.0 F)
1946	35.0 C (95.0 F)
1947	37.2 C (99.0 F)
1948	36.1 C (97.0 F)
1949	36.7 C (98.1 F)
1950	32.2 C (90.0 F)
1951	32.8 C (91.0 F)
1952	36.1 C (97.0 F)
1953	37.2 C (99.0 F)
1954	34.4 C (93.9 F)
1955	37.8 C (100.0 F)
1956	35.6 C (96.1 F)
1957	35.6 C (96.1 F)
1958	33.3 C (91.9 F)
1959	33.9 C (93.0 F)
1960	35.0 C (95.0 F)
1961	35.0 C (95.0 F)
1962	36.1 C (97.0 F)
1963	35.6 C (96.1 F)
1964	36.7 C (98.1 F)
1965	35.6 C (96.1 F)
1966	36.7 C (98.1 F)
1967	33.3 C (91.9 F)
1968	35.0 C (95.0 F)
1969	33.3 C (91.9 F)
1970	33.9 C (93.0 F)
1971	37.2 C (99.0 F)
1972	36.1 C (97.0 F)
1973	35.0 C (95.0 F)
1974	35.0 C (95.0 F)
1975	35.0 C (95.0 F)
1976	34.4 C (93.9 F)
1977	36.7 C (98.1 F)
1978	34.4 C (93.9 F)

Coldest night (TNn)

The coldest night of the year at Bay City, 1896 to 1978. The record is -35.0 C (-31.0 F) in 1918, marked on the chart; the median year is -22.2 C (-8.0 F).

Coldest night (TNn) at Bay City by year
Year	Coldest night (TNn)
1896	-16.1 C (3.0 F)
1897	-22.2 C (-8.0 F)
1898	-22.8 C (-9.0 F)
1899	-29.4 C (-20.9 F)
1900	-24.4 C (-11.9 F)
1901	-22.2 C (-8.0 F)
1902	-18.9 C (-2.0 F)
1903	-24.4 C (-11.9 F)
1904	-28.3 C (-18.9 F)
1905	-26.1 C (-15.0 F)
1906	-23.3 C (-9.9 F)
1907	-21.7 C (-7.1 F)
1908	-24.4 C (-11.9 F)
1909	-22.8 C (-9.0 F)
1910	-21.1 C (-6.0 F)
1911	-18.9 C (-2.0 F)
1912	-30.0 C (-22.0 F)
1913	-26.1 C (-15.0 F)
1914	-23.3 C (-9.9 F)
1915	-16.1 C (3.0 F)
1916	-30.0 C (-22.0 F)
1917	-28.3 C (-18.9 F)
1918	-35.0 C (-31.0 F)
1919	-19.4 C (-2.9 F)
1920	-31.7 C (-25.1 F)
1921	-16.7 C (1.9 F)
1922	-22.8 C (-9.0 F)
1923	-23.3 C (-9.9 F)
1924	-25.6 C (-14.1 F)
1925	-30.6 C (-23.1 F)
1926	-23.9 C (-11.0 F)
1927	-27.8 C (-18.0 F)
1928	-26.7 C (-16.1 F)
1929	-31.7 C (-25.1 F)
1930	-20.0 C (-4.0 F)
1931	-18.3 C (-0.9 F)
1932	-20.6 C (-5.1 F)
1933	-23.9 C (-11.0 F)
1934	-28.9 C (-20.0 F)
1935	-22.2 C (-8.0 F)
1936	-23.9 C (-11.0 F)
1937	-15.0 C (5.0 F)
1938	-18.9 C (-2.0 F)
1939	-19.4 C (-2.9 F)
1940	-21.1 C (-6.0 F)
1941	-15.0 C (5.0 F)
1942	-22.2 C (-8.0 F)
1943	-23.3 C (-9.9 F)
1944	-19.4 C (-2.9 F)
1945	-18.3 C (-0.9 F)
1946	-20.6 C (-5.1 F)
1947	-18.9 C (-2.0 F)
1948	-24.4 C (-11.9 F)
1949	-16.1 C (3.0 F)
1950	-19.4 C (-2.9 F)
1951	-24.4 C (-11.9 F)
1952	-18.3 C (-0.9 F)
1953	-15.6 C (3.9 F)
1954	-18.9 C (-2.0 F)
1955	-20.6 C (-5.1 F)
1956	-15.6 C (3.9 F)
1957	-18.9 C (-2.0 F)
1958	-22.8 C (-9.0 F)
1959	-23.3 C (-9.9 F)
1960	-21.1 C (-6.0 F)
1961	-20.6 C (-5.1 F)
1962	-22.8 C (-9.0 F)
1963	-24.4 C (-11.9 F)
1964	-18.3 C (-0.9 F)
1965	-21.7 C (-7.1 F)
1966	-23.3 C (-9.9 F)
1967	-20.6 C (-5.1 F)
1968	-22.2 C (-8.0 F)
1969	-21.1 C (-6.0 F)
1970	-20.6 C (-5.1 F)
1971	-22.8 C (-9.0 F)
1972	-24.4 C (-11.9 F)
1973	-21.7 C (-7.1 F)
1974	-18.9 C (-2.0 F)
1975	-17.8 C (0.0 F)
1976	-25.0 C (-13.0 F)
1977	-25.6 C (-14.1 F)
1978	-21.7 C (-7.1 F)

Wettest day (Rx1day)

The wettest day of the year at Bay City, 1896 to 1978. The record is 152.4 mm (6.0 in) in 1913, marked on the chart; the median year is 48.3 mm (1.9 in).

Wettest day (Rx1day) at Bay City by year
Year	Wettest day (Rx1day)
1896	30.5 mm (1.2 in)
1897	130.3 mm (5.1 in)
1898	68.3 mm (2.7 in)
1899	96.5 mm (3.8 in)
1900	47.0 mm (1.9 in)
1901	53.3 mm (2.1 in)
1902	68.6 mm (2.7 in)
1903	55.9 mm (2.2 in)
1904	38.1 mm (1.5 in)
1905	68.6 mm (2.7 in)
1906	50.8 mm (2.0 in)
1907	38.1 mm (1.5 in)
1908	38.1 mm (1.5 in)
1909	57.2 mm (2.3 in)
1910	63.5 mm (2.5 in)
1911	53.3 mm (2.1 in)
1912	48.3 mm (1.9 in)
1913	152.4 mm (6.0 in)
1914	61.0 mm (2.4 in)
1915	45.7 mm (1.8 in)
1916	52.1 mm (2.1 in)
1917	45.5 mm (1.8 in)
1918	56.6 mm (2.2 in)
1919	50.8 mm (2.0 in)
1920	38.1 mm (1.5 in)
1921	82.3 mm (3.2 in)
1922	45.2 mm (1.8 in)
1923	52.3 mm (2.1 in)
1924	42.7 mm (1.7 in)
1925	51.8 mm (2.0 in)
1926	39.9 mm (1.6 in)
1927	29.7 mm (1.2 in)
1928	106.7 mm (4.2 in)
1929	53.3 mm (2.1 in)
1930	35.6 mm (1.4 in)
1931	56.1 mm (2.2 in)
1932	35.8 mm (1.4 in)
1933	39.1 mm (1.5 in)
1934	29.0 mm (1.1 in)
1935	77.0 mm (3.0 in)
1936	22.9 mm (0.9 in)
1937	91.9 mm (3.6 in)
1938	42.9 mm (1.7 in)
1939	48.0 mm (1.9 in)
1940	44.5 mm (1.8 in)
1941	47.5 mm (1.9 in)
1942	73.7 mm (2.9 in)
1943	55.9 mm (2.2 in)
1944	24.9 mm (1.0 in)
1945	91.4 mm (3.6 in)
1946	26.4 mm (1.0 in)
1947	55.6 mm (2.2 in)
1948	44.5 mm (1.8 in)
1949	48.3 mm (1.9 in)
1950	48.3 mm (1.9 in)
1951	63.5 mm (2.5 in)
1952	32.5 mm (1.3 in)
1953	32.5 mm (1.3 in)
1954	73.7 mm (2.9 in)
1955	33.0 mm (1.3 in)
1956	43.2 mm (1.7 in)
1957	55.9 mm (2.2 in)
1958	63.5 mm (2.5 in)
1959	47.2 mm (1.9 in)
1960	30.5 mm (1.2 in)
1961	48.3 mm (1.9 in)
1962	45.0 mm (1.8 in)
1963	36.8 mm (1.4 in)
1964	35.6 mm (1.4 in)
1965	46.7 mm (1.8 in)
1966	22.9 mm (0.9 in)
1967	58.7 mm (2.3 in)
1968	39.9 mm (1.6 in)
1969	34.3 mm (1.4 in)
1970	58.9 mm (2.3 in)
1971	38.4 mm (1.5 in)
1972	55.4 mm (2.2 in)
1973	74.9 mm (2.9 in)
1974	44.5 mm (1.8 in)
1975	51.3 mm (2.0 in)
1976	51.3 mm (2.0 in)
1977	48.8 mm (1.9 in)
1978	55.1 mm (2.2 in)

Wettest five days (Rx5day)

The wettest five days of the year at Bay City, 1896 to 1978. The record is 173.0 mm (6.8 in) in 1913, marked on the chart; the median year is 69.4 mm (2.7 in).

Wettest five days (Rx5day) at Bay City by year
Year	Wettest five days (Rx5day)
1896	70.3 mm (2.8 in)
1897	145.3 mm (5.7 in)
1898	81.8 mm (3.2 in)
1899	128.5 mm (5.1 in)
1900	70.3 mm (2.8 in)
1901	109.2 mm (4.3 in)
1902	87.9 mm (3.5 in)
1903	114.3 mm (4.5 in)
1904	57.1 mm (2.2 in)
1905	112.5 mm (4.4 in)
1906	63.5 mm (2.5 in)
1907	76.2 mm (3.0 in)
1908	65.9 mm (2.6 in)
1909	85.1 mm (3.4 in)
1910	86.4 mm (3.4 in)
1911	91.7 mm (3.6 in)
1912	85.8 mm (3.4 in)
1913	173.0 mm (6.8 in)
1914	80.9 mm (3.2 in)
1915	66.5 mm (2.6 in)
1916	56.8 mm (2.2 in)
1917	84.8 mm (3.3 in)
1918	85.2 mm (3.4 in)
1919	68.6 mm (2.7 in)
1920	44.7 mm (1.8 in)
1921	83.6 mm (3.3 in)
1922	76.7 mm (3.0 in)
1923	75.1 mm (3.0 in)
1924	84.1 mm (3.3 in)
1925	61.7 mm (2.4 in)
1926	85.4 mm (3.4 in)
1927	63.6 mm (2.5 in)
1928	136.1 mm (5.4 in)
1929	100.6 mm (4.0 in)
1930	39.1 mm (1.5 in)
1931	57.6 mm (2.3 in)
1932	48.7 mm (1.9 in)
1933	66.8 mm (2.6 in)
1934	67.7 mm (2.7 in)
1935	104.7 mm (4.1 in)
1936	36.4 mm (1.4 in)
1937	108.2 mm (4.3 in)
1938	76.7 mm (3.0 in)
1939	68.4 mm (2.7 in)
1940	49.2 mm (1.9 in)
1941	28.8 mm (1.1 in)
1942	67.6 mm (2.7 in)
1943	69.4 mm (2.7 in)
1944	41.4 mm (1.6 in)
1945	112.8 mm (4.4 in)
1946	58.7 mm (2.3 in)
1947	60.2 mm (2.4 in)
1948	56.5 mm (2.2 in)
1949	101.4 mm (4.0 in)
1950	118.0 mm (4.6 in)
1951	65.1 mm (2.6 in)
1952	88.4 mm (3.5 in)
1953	63.5 mm (2.5 in)
1954	104.0 mm (4.1 in)
1955	52.9 mm (2.1 in)
1956	55.1 mm (2.2 in)
1957	71.7 mm (2.8 in)
1958	69.1 mm (2.7 in)
1959	55.9 mm (2.2 in)
1960	37.1 mm (1.5 in)
1961	64.5 mm (2.5 in)
1962	95.8 mm (3.8 in)
1963	47.0 mm (1.9 in)
1964	49.9 mm (2.0 in)
1965	64.8 mm (2.6 in)
1966	47.3 mm (1.9 in)
1967	106.2 mm (4.2 in)
1968	67.0 mm (2.6 in)
1969	53.8 mm (2.1 in)
1970	67.6 mm (2.7 in)
1971	39.1 mm (1.5 in)
1972	82.8 mm (3.3 in)
1973	119.3 mm (4.7 in)
1974	62.3 mm (2.5 in)
1975	85.6 mm (3.4 in)
1976	92.3 mm (3.6 in)
1977	68.3 mm (2.7 in)
1978	88.2 mm (3.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Bay City, 1896 to 1978. The record is 39 days in 1900, marked on the chart; the median year is 20 days.

Longest dry spell (CDD) at Bay City by year
Year	Longest dry spell (CDD)
1896	18 days
1897	20 days
1898	18 days
1899	25 days
1900	39 days
1901	20 days
1902	32 days
1903	24 days
1904	29 days
1905	17 days
1906	18 days
1907	16 days
1908	23 days
1909	21 days
1910	37 days
1911	22 days
1912	13 days
1913	22 days
1914	27 days
1915	29 days
1916	19 days
1917	18 days
1918	17 days
1919	23 days
1920	18 days
1921	16 days
1922	20 days
1923	22 days
1924	19 days
1925	19 days
1926	16 days
1927	16 days
1928	17 days
1929	20 days
1930	20 days
1931	20 days
1932	27 days
1933	27 days
1934	29 days
1935	14 days
1936	22 days
1937	30 days
1938	29 days
1939	20 days
1940	34 days
1941	3 days
1942	2 days
1943	25 days
1944	24 days
1945	22 days
1946	17 days
1947	22 days
1948	20 days
1949	15 days
1950	18 days
1951	18 days
1952	29 days
1953	22 days
1954	19 days
1955	18 days
1956	34 days
1957	17 days
1958	33 days
1959	12 days
1960	17 days
1961	22 days
1962	23 days
1963	38 days
1964	19 days
1965	23 days
1966	20 days
1967	26 days
1968	24 days
1969	24 days
1970	15 days
1971	19 days
1972	16 days
1973	17 days
1974	14 days
1975	17 days
1976	23 days
1977	31 days
1978	29 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.

Frost Dates and Growing Season

67 years with a frost

Across 67 years with a frost, the median last spring frost at Bay City falls on 6 May and the median first autumn frost on 13 October, which leaves a median of 162 days between them.

In 1945 to 1976 the median growing season was 170 days. That is 15 days more than in 1898 to 1937.

Fitted over all years, the growing season changes by +2.7 days per decade at this station.

Frost dates and growing season at Bay City
Measure	Median, all years	Earliest period (1898 to 1937)	Recent period (1945 to 1976)	Recent against earliest	Fitted trend
Last spring frost	6 May	10 May	3 May	7 days earlier	-1.6 days per decade
First autumn frost	13 October	10 October	20 October	10 days later	+1.1 days per decade
Growing days	162 days	155 days	170 days	15 days more	+2.7 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

75 years, 1897 to 1977

A day with at least 47.1 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 135.2 mm (5.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Bay City: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	47.1 mm (1.9 in)
5 years	64.6 mm (2.5 in)
10 years	78.3 mm (3.1 in)
25 years	98.5 mm (3.9 in)
50 years	115.8 mm (4.6 in)
100 years	135.2 mm (5.3 in)	Longer than the 75 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, 75 years of values from 1897 to 1977.

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: 152.4 mm (6.0 in) in 1913; 130.3 mm (5.1 in) in 1897; 106.7 mm (4.2 in) in 1928.

Station Changes

2 suspected

2 changes were suspected in the annual mean temperature of Bay City, at 1948 and 1959. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 1948 ran 0.3 C (0.6 F) higher than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1959 ran 0.6 C (1.1 F) lower than in the years before (likely change).

Suspected changes in the annual mean temperature at Bay City, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
1948	+0.3	+0.6	likely	5
1959	-0.6	-1.1	likely	5

Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.

Download the Data

Data for Bay City standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Bay City 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).