Rio Vista Weather Records (USC00047446)

Record envelope, standing records and threshold days for Rio Vista (USC00047446), California, United States, with 85 years of record.

Key Facts for Rio Vista

Rio Vista (USC00047446) is a weather station in California, United States at 38.15 latitude and -121.70 longitude, 12 m (39 ft) above sea level.
The station reports from 1893 to 1977, 85 years of record.
1,464 records set at Rio Vista still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Rio Vista set a daily record precipitation of 6.4 mm (0.25 in) on 18 May 1977.

About the Station

Location: California, United States, 38.15 latitude, -121.70 longitude.
Elevation: 12 m (39 ft).
Period of record: 1893 to 1977, 85 years.
Eligible elements: prcp.

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 Rio Vista. 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 Rio Vista, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	24.4 C (75.9 F)	-4.4 C (24.1 F)	n/a	n/a
Feb	28.3 C (82.9 F)	-3.9 C (25.0 F)	n/a	n/a
Mar	26.1 C (79.0 F)	-2.2 C (28.0 F)	n/a	n/a
Apr	34.4 C (93.9 F)	-1.1 C (30.0 F)	n/a	n/a
May	36.7 C (98.1 F)	2.8 C (37.0 F)	n/a	n/a
Jun	40.6 C (105.1 F)	7.2 C (45.0 F)	n/a	n/a
Jul	42.8 C (109.0 F)	10.0 C (50.0 F)	n/a	n/a
Aug	42.2 C (108.0 F)	8.9 C (48.0 F)	n/a	n/a
Sep	40.0 C (104.0 F)	3.9 C (39.0 F)	n/a	n/a
Oct	36.1 C (97.0 F)	1.7 C (35.1 F)	n/a	n/a
Nov	26.1 C (79.0 F)	-5.0 C (23.0 F)	n/a	n/a
Dec	20.6 C (69.1 F)	-6.1 C (21.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Rio Vista still stand. 1895 holds the most, with 157.

Wettest Day of Each Month

Dec: 72.9 mm (2.9 in)

The wettest day on record for each calendar month at Rio Vista. The most was 72.9 mm (2.9 in) on 31 December 1913.

Record daily precipitation for each month at Rio Vista
Month	Record daily precipitation (mm)	Date
Jan	72.6 mm (2.9 in)	14 January 1911
Feb	68.6 mm (2.7 in)	12 February 1904
Mar	48.8 mm (1.9 in)	24 March 1928
Apr	58.4 mm (2.3 in)	8 April 1935
May	33.0 mm (1.3 in)	11 May 1915
Jun	19.3 mm (0.8 in)	3 June 1936
Jul	12.7 mm (0.5 in)	8 July 1974
Aug	19.6 mm (0.8 in)	21 August 1968
Sep	71.1 mm (2.8 in)	13 September 1918
Oct	71.1 mm (2.8 in)	12 October 1962
Nov	50.8 mm (2.0 in)	24 November 1896
Dec	72.9 mm (2.9 in)	31 December 1913

Period of Record Coverage

1893 to 1971

16 years of record at Rio Vista, 1893 to 1971. 4 years have data for under 90 percent of days and are left out of rankings: 1893, 1901, 1907, 1971.

Days with data per year at Rio Vista
Year	Days with data	Share of year	Complete
1893	265	73%	No
1894	361	99%	Yes
1895	365	100%	Yes
1896	366	100%	Yes
1897	333	91%	Yes
1898	364	100%	Yes
1899	363	99%	Yes
1900	349	96%	Yes
1901	207	57%	No
1902	362	99%	Yes
1903	360	99%	Yes
1904	361	99%	Yes
1905	360	99%	Yes
1906	363	99%	Yes
1907	59	16%	No
1971	28	8%	No

Latest Records

Latest records at Rio Vista
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 May 1977	Rio Vista, US	daily rain	6.4 mm (0.25 in)	3.1 mm (0.12 in)	66 years	20 of 100 (Routine)
1 May 1977	Rio Vista, US	daily rain	14.0 mm (0.6 in)	5.1 mm (0.20 in)	6 years	18 of 100 (Routine)
30 April 1977	Rio Vista, US	daily rain	24.1 mm (0.9 in)	3.5 mm (0.14 in)	36 years	20 of 100 (Routine)
22 August 1976	Rio Vista, US	daily rain	3.3 mm (0.13 in)	3.3 mm (0.13 in)	80 years	20 of 100 (Routine)
18 August 1976	Rio Vista, US	daily rain	3.0 mm (0.12 in)	1.0 mm (0.04 in)	1 year	9 of 100 (Routine)
17 August 1976	Rio Vista, US	daily rain	1.0 mm (0.04 in)	1.0 mm (0.04 in)	80 years	20 of 100 (Routine)
15 August 1976	Rio Vista, US	daily rain	8.6 mm (0.34 in)	5.6 mm (0.22 in)	60 years	20 of 100 (Routine)
14 August 1976	Rio Vista, US	daily rain	8.9 mm (0.35 in)	7.9 mm (0.31 in)	60 years	20 of 100 (Routine)
29 February 1976	Rio Vista, US	daily rain	20.6 mm (0.8 in)	1.5 mm (0.06 in)	32 years	18 of 100 (Routine)
29 October 1975	Rio Vista, US	daily rain	14.0 mm (0.6 in)	3.6 mm (0.14 in)	28 years	19 of 100 (Routine)
10 October 1975	Rio Vista, US	daily rain	20.6 mm (0.8 in)	2.6 mm (0.10 in)	12 years	13 of 100 (Routine)
9 October 1975	Rio Vista, US	daily rain	23.4 mm (0.9 in)	17.3 mm (0.7 in)	2 years	20 of 100 (Routine)
18 August 1975	Rio Vista, US	daily rain	2.0 mm (0.08 in)	1.7 mm (0.07 in)	77 years	20 of 100 (Routine)
15 July 1975	Rio Vista, US	daily rain	6.4 mm (0.25 in)	6.4 mm (0.25 in)	81 years	20 of 100 (Routine)
21 March 1975	Rio Vista, US	daily rain	19.1 mm (0.8 in)	2.3 mm (0.09 in)	37 years	20 of 100 (Routine)
8 July 1974	Rio Vista, US	monthly rain	12.7 mm (0.5 in)	8.6 mm (0.34 in)	24 years	20 of 100 (Routine)
7 July 1974	Rio Vista, US	daily rain	1.3 mm (0.05 in)	1.3 mm (0.05 in)	80 years	20 of 100 (Routine)
19 June 1974	Rio Vista, US	daily rain	13.2 mm (0.5 in)	11.2 mm (0.4 in)	60 years	20 of 100 (Routine)
1 April 1974	Rio Vista, US	daily rain	29.5 mm (1.2 in)	7.4 mm (0.29 in)	47 years	31 of 100 (Routine)
25 March 1974	Rio Vista, US	daily rain	17.3 mm (0.7 in)	2.1 mm (0.08 in)	45 years	20 of 100 (Routine)

Climate Trend

10 complete years, 1894 to 1906

One stripe for each of 10 complete years at Rio Vista, 1894 to 1906. Blue stripes are years cooler than the station's own mean of 15.5 C (60.0 F); red stripes are warmer. The coolest year was 1895, at 14.8 C (58.7 F), and the warmest was 1894, at 16.0 C (60.8 F). The strongest colour marks a difference of 0.7 C (1.3 F).

Annual mean temperature at Rio Vista as warming stripes, 1894 to 1906
Year	Annual mean temperature	Difference from the station mean
1894	16.0 C	+0.48 C
1895	14.8 C	-0.69 C
1896	15.6 C	+0.02 C
1898	15.6 C	+0.10 C
1899	15.7 C	+0.14 C
1902	15.8 C	+0.27 C
1903	15.3 C	-0.27 C
1904	15.4 C	-0.15 C
1905	15.4 C	-0.15 C
1906	15.8 C	+0.24 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

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

1893 to 1977

Yearly extremes at Rio Vista: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	42.8 C (109.0 F)	1902	40.6 C (105.1 F)	16
Coldest night (TNn)	-6.1 C (21.0 F)	1898	-3.9 C (25.0 F)	16
Wettest day (Rx1day)	72.9 mm (2.9 in)	1913	41.8 mm (1.6 in)	80
Wettest five days (Rx5day)	159.0 mm (6.3 in)	1931	72.7 mm (2.9 in)	80
Longest dry spell (CDD)	209 days	1932	108 days	80

Hottest day (TXx)

The hottest day of the year at Rio Vista, 1893 to 1977. The record is 42.8 C (109.0 F) in 1902, marked on the chart; the median year is 40.6 C (105.1 F).

Hottest day (TXx) at Rio Vista by year
Year	Hottest day (TXx)
1893	40.6 C (105.1 F)
1894	41.1 C (106.0 F)
1895	40.6 C (105.1 F)
1896	41.7 C (107.1 F)
1897	41.7 C (107.1 F)
1898	42.2 C (108.0 F)
1899	41.1 C (106.0 F)
1900	39.4 C (102.9 F)
1901	40.0 C (104.0 F)
1902	42.8 C (109.0 F)
1903	40.0 C (104.0 F)
1904	40.0 C (104.0 F)
1905	42.2 C (108.0 F)
1906	40.0 C (104.0 F)
1907	20.6 C (69.1 F)
1908	n/a
1909	n/a
1910	n/a
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
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
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	18.9 C (66.0 F)
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a

Coldest night (TNn)

The coldest night of the year at Rio Vista, 1893 to 1977. The record is -6.1 C (21.0 F) in 1898, marked on the chart; the median year is -3.9 C (25.0 F).

Coldest night (TNn) at Rio Vista by year
Year	Coldest night (TNn)
1893	-1.1 C (30.0 F)
1894	-3.9 C (25.0 F)
1895	-4.4 C (24.1 F)
1896	-3.9 C (25.0 F)
1897	-4.4 C (24.1 F)
1898	-6.1 C (21.0 F)
1899	-3.9 C (25.0 F)
1900	-2.2 C (28.0 F)
1901	-3.9 C (25.0 F)
1902	-3.9 C (25.0 F)
1903	-2.2 C (28.0 F)
1904	-3.3 C (26.1 F)
1905	-3.9 C (25.0 F)
1906	-3.9 C (25.0 F)
1907	-1.1 C (30.0 F)
1908	n/a
1909	n/a
1910	n/a
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
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
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	-1.1 C (30.0 F)
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 Rio Vista, 1893 to 1977. The record is 72.9 mm (2.9 in) in 1913, marked on the chart; the median year is 41.8 mm (1.6 in).

Wettest day (Rx1day) at Rio Vista by year
Year	Wettest day (Rx1day)
1893	29.2 mm (1.1 in)
1894	55.9 mm (2.2 in)
1895	49.3 mm (1.9 in)
1896	50.8 mm (2.0 in)
1897	41.4 mm (1.6 in)
1898	30.7 mm (1.2 in)
1899	64.8 mm (2.6 in)
1900	45.0 mm (1.8 in)
1901	49.0 mm (1.9 in)
1902	29.5 mm (1.2 in)
1903	28.4 mm (1.1 in)
1904	68.6 mm (2.7 in)
1905	30.2 mm (1.2 in)
1906	44.5 mm (1.8 in)
1907	23.6 mm (0.9 in)
1908	27.4 mm (1.1 in)
1909	34.5 mm (1.4 in)
1910	35.1 mm (1.4 in)
1911	72.6 mm (2.9 in)
1912	49.8 mm (2.0 in)
1913	72.9 mm (2.9 in)
1914	53.3 mm (2.1 in)
1915	42.2 mm (1.7 in)
1916	62.0 mm (2.4 in)
1917	26.2 mm (1.0 in)
1918	71.1 mm (2.8 in)
1919	52.6 mm (2.1 in)
1920	19.8 mm (0.8 in)
1921	45.0 mm (1.8 in)
1922	44.2 mm (1.7 in)
1923	24.6 mm (1.0 in)
1924	33.5 mm (1.3 in)
1925	42.4 mm (1.7 in)
1926	46.2 mm (1.8 in)
1927	50.8 mm (2.0 in)
1928	48.8 mm (1.9 in)
1929	33.8 mm (1.3 in)
1930	46.2 mm (1.8 in)
1931	54.6 mm (2.1 in)
1932	31.8 mm (1.3 in)
1933	36.8 mm (1.4 in)
1934	42.4 mm (1.7 in)
1935	58.4 mm (2.3 in)
1936	38.1 mm (1.5 in)
1937	64.3 mm (2.5 in)
1938	41.1 mm (1.6 in)
1939	40.4 mm (1.6 in)
1940	48.0 mm (1.9 in)
1941	31.5 mm (1.2 in)
1942	38.6 mm (1.5 in)
1943	22.6 mm (0.9 in)
1944	45.2 mm (1.8 in)
1945	47.2 mm (1.9 in)
1946	40.1 mm (1.6 in)
1947	26.7 mm (1.1 in)
1948	28.4 mm (1.1 in)
1949	18.0 mm (0.7 in)
1950	43.2 mm (1.7 in)
1951	38.1 mm (1.5 in)
1952	65.3 mm (2.6 in)
1953	33.0 mm (1.3 in)
1959	21.6 mm (0.9 in)
1960	29.7 mm (1.2 in)
1961	30.7 mm (1.2 in)
1962	71.1 mm (2.8 in)
1963	41.7 mm (1.6 in)
1964	45.7 mm (1.8 in)
1965	31.5 mm (1.2 in)
1966	41.9 mm (1.6 in)
1967	50.8 mm (2.0 in)
1968	44.2 mm (1.7 in)
1969	71.6 mm (2.8 in)
1970	44.5 mm (1.8 in)
1971	46.7 mm (1.8 in)
1972	33.5 mm (1.3 in)
1973	35.1 mm (1.4 in)
1974	29.5 mm (1.2 in)
1975	28.4 mm (1.1 in)
1976	20.6 mm (0.8 in)
1977	24.1 mm (0.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Rio Vista, 1893 to 1977. The record is 159.0 mm (6.3 in) in 1931, marked on the chart; the median year is 72.7 mm (2.9 in).

Wettest five days (Rx5day) at Rio Vista by year
Year	Wettest five days (Rx5day)
1893	58.4 mm (2.3 in)
1894	85.3 mm (3.4 in)
1895	85.0 mm (3.3 in)
1896	124.7 mm (4.9 in)
1897	78.5 mm (3.1 in)
1898	35.0 mm (1.4 in)
1899	94.4 mm (3.7 in)
1900	104.7 mm (4.1 in)
1901	62.7 mm (2.5 in)
1902	69.6 mm (2.7 in)
1903	65.5 mm (2.6 in)
1904	116.1 mm (4.6 in)
1905	57.5 mm (2.3 in)
1906	79.8 mm (3.1 in)
1907	39.9 mm (1.6 in)
1908	37.1 mm (1.5 in)
1909	80.7 mm (3.2 in)
1910	67.1 mm (2.6 in)
1911	143.7 mm (5.7 in)
1912	37.9 mm (1.5 in)
1913	85.3 mm (3.4 in)
1914	118.6 mm (4.7 in)
1915	73.2 mm (2.9 in)
1916	108.2 mm (4.3 in)
1917	71.7 mm (2.8 in)
1918	118.9 mm (4.7 in)
1919	101.9 mm (4.0 in)
1920	48.2 mm (1.9 in)
1921	87.1 mm (3.4 in)
1922	76.0 mm (3.0 in)
1923	78.9 mm (3.1 in)
1924	63.2 mm (2.5 in)
1925	76.9 mm (3.0 in)
1926	99.2 mm (3.9 in)
1927	88.4 mm (3.5 in)
1928	97.3 mm (3.8 in)
1929	46.0 mm (1.8 in)
1930	61.1 mm (2.4 in)
1931	159.0 mm (6.3 in)
1932	63.9 mm (2.5 in)
1933	67.3 mm (2.6 in)
1934	85.5 mm (3.4 in)
1935	68.3 mm (2.7 in)
1936	103.2 mm (4.1 in)
1937	111.3 mm (4.4 in)
1938	102.6 mm (4.0 in)
1939	69.9 mm (2.8 in)
1940	141.6 mm (5.6 in)
1941	51.8 mm (2.0 in)
1942	95.3 mm (3.8 in)
1943	71.9 mm (2.8 in)
1944	65.1 mm (2.6 in)
1945	95.0 mm (3.7 in)
1946	72.2 mm (2.8 in)
1947	46.0 mm (1.8 in)
1948	52.8 mm (2.1 in)
1949	39.0 mm (1.5 in)
1950	95.9 mm (3.8 in)
1951	68.6 mm (2.7 in)
1952	108.5 mm (4.3 in)
1953	42.0 mm (1.7 in)
1959	30.5 mm (1.2 in)
1960	46.0 mm (1.8 in)
1961	60.2 mm (2.4 in)
1962	152.4 mm (6.0 in)
1963	83.6 mm (3.3 in)
1964	66.0 mm (2.6 in)
1965	61.0 mm (2.4 in)
1966	68.9 mm (2.7 in)
1967	104.2 mm (4.1 in)
1968	70.4 mm (2.8 in)
1969	96.0 mm (3.8 in)
1970	94.0 mm (3.7 in)
1971	91.6 mm (3.6 in)
1972	64.3 mm (2.5 in)
1973	98.1 mm (3.9 in)
1974	43.7 mm (1.7 in)
1975	49.0 mm (1.9 in)
1976	31.0 mm (1.2 in)
1977	53.6 mm (2.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Rio Vista, 1893 to 1977. The record is 209 days in 1932, marked on the chart; the median year is 108 days.

Longest dry spell (CDD) at Rio Vista by year
Year	Longest dry spell (CDD)
1893	72 days
1894	48 days
1895	40 days
1896	60 days
1897	80 days
1898	37 days
1899	67 days
1900	110 days
1901	25 days
1902	60 days
1903	141 days
1904	118 days
1905	123 days
1906	98 days
1907	12 days
1908	74 days
1909	43 days
1910	76 days
1911	42 days
1912	73 days
1913	99 days
1914	114 days
1915	100 days
1916	81 days
1917	120 days
1918	103 days
1919	103 days
1920	172 days
1921	146 days
1922	103 days
1923	62 days
1924	164 days
1925	123 days
1926	105 days
1927	140 days
1928	174 days
1929	112 days
1930	139 days
1931	128 days
1932	209 days
1933	102 days
1934	108 days
1935	154 days
1936	88 days
1937	108 days
1938	149 days
1939	131 days
1940	129 days
1941	152 days
1942	105 days
1943	120 days
1944	151 days
1945	145 days
1946	129 days
1947	122 days
1948	127 days
1949	129 days
1950	136 days
1951	89 days
1952	73 days
1953	38 days
1959	52 days
1960	67 days
1961	96 days
1962	165 days
1963	124 days
1964	140 days
1965	112 days
1966	99 days
1967	163 days
1968	51 days
1969	173 days
1970	87 days
1971	139 days
1972	108 days
1973	140 days
1974	110 days
1975	81 days
1976	65 days
1977	26 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.

Rainfall Return Levels

64 years, 1896 to 1976

A day with at least 41.3 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 79.5 mm (3.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Rio Vista: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	41.3 mm (1.6 in)
5 years	53.4 mm (2.1 in)
10 years	60.6 mm (2.4 in)
25 years	68.8 mm (2.7 in)
50 years	74.4 mm (2.9 in)
100 years	79.5 mm (3.1 in)	Longer than the 64 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, 64 years of values from 1896 to 1976.

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: 72.9 mm (2.9 in) in 1913; 71.6 mm (2.8 in) in 1969; 71.1 mm (2.8 in) in 1918.

Download the Data

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