Arroyo Seco Rng STN Fc Weather Records (USC00040327)

Record envelope, standing records and threshold days for Arroyo Seco Rng STN Fc (USC00040327), California, United States, with 59 years of record.

Key Facts for Arroyo Seco Rng STN Fc

Arroyo Seco Rng STN Fc (USC00040327) is a weather station in California, United States at 34.22 latitude and -118.17 longitude, 372 m (1,220 ft) above sea level.
The station reports from 1916 to 1974, 59 years of record.
1,464 records set at Arroyo Seco Rng STN Fc still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Arroyo Seco Rng STN Fc set a daily record precipitation of 71.4 mm (2.8 in) on 8 March 1974.

About the Station

Location: California, United States, 34.22 latitude, -118.17 longitude.
Elevation: 372 m (1,220 ft).
Period of record: 1916 to 1974, 59 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 Arroyo Seco Rng STN Fc. 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 Arroyo Seco Rng STN Fc, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	29.4 C (84.9 F)	-1.7 C (28.9 F)	n/a	n/a
Feb	31.1 C (88.0 F)	-1.7 C (28.9 F)	n/a	n/a
Mar	31.7 C (89.1 F)	-0.6 C (30.9 F)	n/a	n/a
Apr	35.6 C (96.1 F)	-0.6 C (30.9 F)	n/a	n/a
May	36.7 C (98.1 F)	3.9 C (39.0 F)	n/a	n/a
Jun	37.8 C (100.0 F)	3.3 C (37.9 F)	n/a	n/a
Jul	42.8 C (109.0 F)	3.3 C (37.9 F)	n/a	n/a
Aug	44.4 C (111.9 F)	4.4 C (39.9 F)	n/a	n/a
Sep	42.8 C (109.0 F)	5.0 C (41.0 F)	n/a	n/a
Oct	37.2 C (99.0 F)	0.6 C (33.1 F)	n/a	n/a
Nov	32.2 C (90.0 F)	-3.9 C (25.0 F)	n/a	n/a
Dec	34.4 C (93.9 F)	-1.7 C (28.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Arroyo Seco Rng STN Fc still stand. 1938 holds the most, with 324.

Wettest Day of Each Month

Dec: 306.1 mm (12.1 in)

The wettest day on record for each calendar month at Arroyo Seco Rng STN Fc. The most was 306.1 mm (12.1 in) on 20 December 1921.

Record daily precipitation for each month at Arroyo Seco Rng STN Fc
Month	Record daily precipitation (mm)	Date
Jan	254.0 mm (10.0 in)	1 January 1934
Feb	203.7 mm (8.0 in)	20 February 1941
Mar	205.7 mm (8.1 in)	2 March 1938
Apr	86.4 mm (3.4 in)	8 April 1926
May	65.3 mm (2.6 in)	22 May 1921
Jun	16.5 mm (0.6 in)	4 June 1925
Jul	9.1 mm (0.36 in)	1 July 1935
Aug	31.8 mm (1.3 in)	10 August 1942
Sep	134.6 mm (5.3 in)	25 September 1939
Oct	74.9 mm (2.9 in)	18 October 1934
Nov	157.5 mm (6.2 in)	19 November 1967
Dec	306.1 mm (12.1 in)	20 December 1921

Period of Record Coverage

1916 to 1943

11 years of record at Arroyo Seco Rng STN Fc, 1916 to 1943. 8 years have data for under 90 percent of days and are left out of rankings: 1916, 1933, 1935, 1936, 1937, 1941, 1942, 1943.

Days with data per year at Arroyo Seco Rng STN Fc
Year	Days with data	Share of year	Complete
1916	29	8%	No
1933	109	30%	No
1935	7	2%	No
1936	11	3%	No
1937	91	25%	No
1938	357	98%	Yes
1939	363	99%	Yes
1940	350	96%	Yes
1941	300	82%	No
1942	320	88%	No
1943	182	50%	No

Latest Records

Latest records at Arroyo Seco Rng STN Fc
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
8 March 1974	Arroyo Seco Rng STN Fc, US	daily rain	71.4 mm (2.8 in)	10.2 mm (0.4 in)	5 years	10 of 100 (Routine)
5 January 1974	Arroyo Seco Rng STN Fc, US	daily rain	53.1 mm (2.1 in)	14.0 mm (0.6 in)	39 years	20 of 100 (Routine)
4 January 1974	Arroyo Seco Rng STN Fc, US	daily rain	42.7 mm (1.7 in)	22.1 mm (0.9 in)	34 years	21 of 100 (Routine)
1 December 1973	Arroyo Seco Rng STN Fc, US	daily rain	48.0 mm (1.9 in)	36.6 mm (1.4 in)	18 years	21 of 100 (Routine)
18 November 1973	Arroyo Seco Rng STN Fc, US	daily rain	49.0 mm (1.9 in)	9.1 mm (0.36 in)	8 years	10 of 100 (Routine)
11 February 1973	Arroyo Seco Rng STN Fc, US	daily rain	112.0 mm (4.4 in)	9.1 mm (0.36 in)	11 years	11 of 100 (Routine)
7 February 1973	Arroyo Seco Rng STN Fc, US	daily rain	62.0 mm (2.4 in)	47.3 mm (1.9 in)	36 years	33 of 100 (Routine)
27 August 1972	Arroyo Seco Rng STN Fc, US	daily rain	0.5 mm (0.02 in)	0.5 mm (0.02 in)	55 years	20 of 100 (Routine)
26 August 1972	Arroyo Seco Rng STN Fc, US	daily rain	2.5 mm (0.10 in)	1.7 mm (0.07 in)	37 years	17 of 100 (Routine)
12 August 1972	Arroyo Seco Rng STN Fc, US	daily rain	6.4 mm (0.25 in)	4.6 mm (0.18 in)	7 years	11 of 100 (Routine)
7 June 1972	Arroyo Seco Rng STN Fc, US	daily rain	2.0 mm (0.08 in)	0.2 mm (0.01 in)	36 years	15 of 100 (Routine)
24 December 1971	Arroyo Seco Rng STN Fc, US	daily rain	71.6 mm (2.8 in)	42.6 mm (1.7 in)	30 years	27 of 100 (Routine)
21 December 1970	Arroyo Seco Rng STN Fc, US	daily rain	45.5 mm (1.8 in)	18.8 mm (0.7 in)	27 years	18 of 100 (Routine)
29 November 1970	Arroyo Seco Rng STN Fc, US	daily rain	150.6 mm (5.9 in)	149.6 mm (5.9 in)	28 years	53 of 100 (Notable)
17 June 1969	Arroyo Seco Rng STN Fc, US	daily rain	10.7 mm (0.4 in)	6.1 mm (0.24 in)	40 years	20 of 100 (Routine)
21 March 1969	Arroyo Seco Rng STN Fc, US	daily rain	24.9 mm (1.0 in)	14.0 mm (0.6 in)	24 years	17 of 100 (Routine)
25 February 1969	Arroyo Seco Rng STN Fc, US	daily rain	100.1 mm (3.9 in)	65.3 mm (2.6 in)	29 years	38 of 100 (Notable)
25 January 1969	Arroyo Seco Rng STN Fc, US	daily rain	224.5 mm (8.8 in)	161.0 mm (6.3 in)	13 years	48 of 100 (Notable)
21 January 1969	Arroyo Seco Rng STN Fc, US	daily rain	125.7 mm (4.9 in)	80.2 mm (3.2 in)	5 years	31 of 100 (Routine)
20 January 1969	Arroyo Seco Rng STN Fc, US	daily rain	66.5 mm (2.6 in)	5.5 mm (0.22 in)	7 years	8 of 100 (Routine)

Extremes by Year

1916 to 1974

Yearly extremes at Arroyo Seco Rng STN Fc: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	44.4 C (111.9 F)	1933	37.8 C (100.0 F)	11
Coldest night (TNn)	-3.9 C (25.0 F)	1938	2.2 C (36.0 F)	11
Wettest day (Rx1day)	306.1 mm (12.1 in)	1921	76.2 mm (3.0 in)	59
Wettest five days (Rx5day)	458.2 mm (18.0 in)	1969	122.4 mm (4.8 in)	59
Longest dry spell (CDD)	191 days	1970	104 days	59

Hottest day (TXx)

The hottest day of the year at Arroyo Seco Rng STN Fc, 1916 to 1974. The record is 44.4 C (111.9 F) in 1933, marked on the chart; the median year is 37.8 C (100.0 F).

Hottest day (TXx) at Arroyo Seco Rng STN Fc by year
Year	Hottest day (TXx)
1916	26.1 C (79.0 F)
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	44.4 C (111.9 F)
1934	n/a
1935	25.6 C (78.1 F)
1936	19.4 C (66.9 F)
1937	37.2 C (99.0 F)
1938	40.6 C (105.1 F)
1939	42.8 C (109.0 F)
1940	39.4 C (102.9 F)
1941	37.8 C (100.0 F)
1942	40.0 C (104.0 F)
1943	37.8 C (100.0 F)
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
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

Coldest night (TNn)

The coldest night of the year at Arroyo Seco Rng STN Fc, 1916 to 1974. The record is -3.9 C (25.0 F) in 1938, marked on the chart; the median year is 2.2 C (36.0 F).

Coldest night (TNn) at Arroyo Seco Rng STN Fc by year
Year	Coldest night (TNn)
1916	2.2 C (36.0 F)
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	5.0 C (41.0 F)
1934	n/a
1935	4.4 C (39.9 F)
1936	4.4 C (39.9 F)
1937	0.6 C (33.1 F)
1938	-3.9 C (25.0 F)
1939	-1.7 C (28.9 F)
1940	2.2 C (36.0 F)
1941	2.8 C (37.0 F)
1942	-1.7 C (28.9 F)
1943	0.0 C (32.0 F)
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
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

Wettest day (Rx1day)

The wettest day of the year at Arroyo Seco Rng STN Fc, 1916 to 1974. The record is 306.1 mm (12.1 in) in 1921, marked on the chart; the median year is 76.2 mm (3.0 in).

Wettest day (Rx1day) at Arroyo Seco Rng STN Fc by year
Year	Wettest day (Rx1day)
1916	47.8 mm (1.9 in)
1917	38.4 mm (1.5 in)
1918	108.0 mm (4.3 in)
1919	88.1 mm (3.5 in)
1920	58.9 mm (2.3 in)
1921	306.1 mm (12.1 in)
1922	103.9 mm (4.1 in)
1923	44.2 mm (1.7 in)
1924	35.1 mm (1.4 in)
1925	62.5 mm (2.5 in)
1926	86.4 mm (3.4 in)
1927	121.9 mm (4.8 in)
1928	76.2 mm (3.0 in)
1929	76.2 mm (3.0 in)
1930	80.8 mm (3.2 in)
1931	100.6 mm (4.0 in)
1932	76.7 mm (3.0 in)
1933	166.4 mm (6.6 in)
1934	254.0 mm (10.0 in)
1935	69.1 mm (2.7 in)
1936	69.3 mm (2.7 in)
1937	88.9 mm (3.5 in)
1938	205.7 mm (8.1 in)
1939	134.6 mm (5.3 in)
1940	75.4 mm (3.0 in)
1941	203.7 mm (8.0 in)
1942	31.8 mm (1.3 in)
1943	218.4 mm (8.6 in)
1944	145.3 mm (5.7 in)
1945	161.3 mm (6.4 in)
1946	97.5 mm (3.8 in)
1947	41.7 mm (1.6 in)
1948	39.4 mm (1.6 in)
1949	56.4 mm (2.2 in)
1950	47.2 mm (1.9 in)
1951	61.2 mm (2.4 in)
1952	124.2 mm (4.9 in)
1953	27.9 mm (1.1 in)
1954	65.3 mm (2.6 in)
1955	43.2 mm (1.7 in)
1956	129.0 mm (5.1 in)
1957	74.9 mm (2.9 in)
1958	82.0 mm (3.2 in)
1959	70.6 mm (2.8 in)
1960	47.0 mm (1.9 in)
1961	48.5 mm (1.9 in)
1962	102.9 mm (4.1 in)
1963	75.7 mm (3.0 in)
1964	45.5 mm (1.8 in)
1965	147.6 mm (5.8 in)
1966	111.8 mm (4.4 in)
1967	157.5 mm (6.2 in)
1968	61.2 mm (2.4 in)
1969	224.5 mm (8.8 in)
1970	150.6 mm (5.9 in)
1971	71.6 mm (2.8 in)
1972	31.2 mm (1.2 in)
1973	112.0 mm (4.4 in)
1974	71.4 mm (2.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Arroyo Seco Rng STN Fc, 1916 to 1974. The record is 458.2 mm (18.0 in) in 1969, marked on the chart; the median year is 122.4 mm (4.8 in).

Wettest five days (Rx5day) at Arroyo Seco Rng STN Fc by year
Year	Wettest five days (Rx5day)
1916	83.1 mm (3.3 in)
1917	107.4 mm (4.2 in)
1918	199.4 mm (7.9 in)
1919	88.1 mm (3.5 in)
1920	31.8 mm (1.3 in)
1921	141.4 mm (5.6 in)
1922	135.8 mm (5.3 in)
1923	85.1 mm (3.4 in)
1924	83.0 mm (3.3 in)
1925	120.4 mm (4.7 in)
1926	286.9 mm (11.3 in)
1927	287.0 mm (11.3 in)
1928	81.3 mm (3.2 in)
1929	92.7 mm (3.6 in)
1930	117.9 mm (4.6 in)
1931	135.1 mm (5.3 in)
1932	105.9 mm (4.2 in)
1933	287.0 mm (11.3 in)
1934	287.8 mm (11.3 in)
1935	69.1 mm (2.7 in)
1936	152.9 mm (6.0 in)
1937	103.6 mm (4.1 in)
1938	396.1 mm (15.6 in)
1939	176.5 mm (6.9 in)
1940	110.7 mm (4.4 in)
1941	288.3 mm (11.4 in)
1942	53.1 mm (2.1 in)
1943	413.7 mm (16.3 in)
1944	277.1 mm (10.9 in)
1945	219.7 mm (8.6 in)
1946	167.3 mm (6.6 in)
1947	55.9 mm (2.2 in)
1948	63.0 mm (2.5 in)
1949	75.7 mm (3.0 in)
1950	61.4 mm (2.4 in)
1951	122.4 mm (4.8 in)
1952	244.4 mm (9.6 in)
1953	38.3 mm (1.5 in)
1954	89.0 mm (3.5 in)
1955	65.3 mm (2.6 in)
1956	236.7 mm (9.3 in)
1957	85.9 mm (3.4 in)
1958	154.6 mm (6.1 in)
1959	79.0 mm (3.1 in)
1960	97.9 mm (3.9 in)
1961	63.3 mm (2.5 in)
1962	245.6 mm (9.7 in)
1963	141.8 mm (5.6 in)
1964	75.0 mm (3.0 in)
1965	248.0 mm (9.8 in)
1966	241.1 mm (9.5 in)
1967	264.7 mm (10.4 in)
1968	74.2 mm (2.9 in)
1969	458.2 mm (18.0 in)
1970	183.9 mm (7.2 in)
1971	151.1 mm (5.9 in)
1972	48.5 mm (1.9 in)
1973	205.0 mm (8.1 in)
1974	225.6 mm (8.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Arroyo Seco Rng STN Fc, 1916 to 1974. The record is 191 days in 1970, marked on the chart; the median year is 104 days.

Longest dry spell (CDD) at Arroyo Seco Rng STN Fc by year
Year	Longest dry spell (CDD)
1916	21 days
1917	164 days
1918	44 days
1919	122 days
1920	70 days
1921	121 days
1922	147 days
1923	83 days
1924	130 days
1925	79 days
1926	149 days
1927	131 days
1928	113 days
1929	104 days
1930	102 days
1931	69 days
1932	116 days
1933	71 days
1934	37 days
1935	54 days
1936	27 days
1937	61 days
1938	59 days
1939	31 days
1940	62 days
1941	77 days
1942	103 days
1943	80 days
1944	86 days
1945	51 days
1946	130 days
1947	88 days
1948	117 days
1949	150 days
1950	59 days
1951	106 days
1952	84 days
1953	148 days
1954	137 days
1955	175 days
1956	147 days
1957	122 days
1958	128 days
1959	162 days
1960	158 days
1961	103 days
1962	140 days
1963	72 days
1964	140 days
1965	55 days
1966	113 days
1967	107 days
1968	84 days
1969	141 days
1970	191 days
1971	136 days
1972	72 days
1973	129 days
1974	37 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

47 years, 1917 to 1973

A day with at least 81.2 mm (3.2 in) of rain is expected about once in 2 years. A day with at least 292.4 mm (11.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Arroyo Seco Rng STN Fc: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	81.2 mm (3.2 in)
5 years	128.9 mm (5.1 in)
10 years	163.7 mm (6.4 in)
25 years	211.9 mm (8.3 in)
50 years	250.8 mm (9.9 in)	Longer than the 47 years of record
100 years	292.4 mm (11.5 in)	Longer than the 47 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, 47 years of values from 1917 to 1973.

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: 224.5 mm (8.8 in) in 1969; 218.4 mm (8.6 in) in 1943; 205.7 mm (8.1 in) in 1938.

Download the Data

Data for Arroyo Seco Rng STN Fc standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Arroyo Seco Rng STN Fc 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).