Challenge Rs Weather Records (USC00041653)

Record envelope, standing records and threshold days for Challenge Rs (USC00041653), California, United States, with 58 years of record.

Key Facts for Challenge Rs

Challenge Rs (USC00041653) is a weather station in California, United States at 39.48 latitude and -121.22 longitude, 783 m (2,570 ft) above sea level.
The station reports from 1937 to 1994, 58 years of record.
566 records set at Challenge Rs still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Challenge Rs set a daily record snowfall of 2.5 cm (1.0 in) on 25 April 1994.

About the Station

Location: California, United States, 39.48 latitude, -121.22 longitude.
Elevation: 783 m (2,570 ft).
Period of record: 1937 to 1994, 58 years.
Eligible elements: 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 Challenge Rs. 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 Challenge Rs, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	n/a	n/a	n/a
Feb	16.7 C (62.1 F)	-5.0 C (23.0 F)	n/a	n/a
Mar	23.9 C (75.0 F)	-3.3 C (26.1 F)	n/a	n/a
Apr	22.2 C (72.0 F)	-6.1 C (21.0 F)	n/a	n/a
May	n/a	n/a	n/a	n/a
Jun	n/a	n/a	n/a	n/a
Jul	n/a	n/a	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	37.2 C (99.0 F)	3.9 C (39.0 F)	n/a	n/a
Oct	33.9 C (93.0 F)	-1.1 C (30.0 F)	n/a	n/a
Nov	27.8 C (82.0 F)	-2.2 C (28.0 F)	n/a	n/a
Dec	n/a	n/a	n/a	n/a

Which Years Hold Standing Records

566 standing records

566 records at Challenge Rs still stand. 1979 holds the most, with 327.

Wettest Day of Each Month

Oct: 252.2 mm (9.9 in)

The wettest day on record for each calendar month at Challenge Rs. The most was 252.2 mm (9.9 in) on 12 October 1962.

Record daily precipitation for each month at Challenge Rs
Month	Record daily precipitation (mm)	Date
Jan	186.9 mm (7.4 in)	21 January 1967
Feb	231.4 mm (9.1 in)	8 February 1960
Mar	179.1 mm (7.1 in)	30 March 1940
Apr	142.7 mm (5.6 in)	5 April 1982
May	97.8 mm (3.9 in)	18 May 1957
Jun	38.1 mm (1.5 in)	29 June 1991
Jul	52.6 mm (2.1 in)	9 July 1974
Aug	34.5 mm (1.4 in)	16 August 1993
Sep	79.2 mm (3.1 in)	19 September 1959
Oct	252.2 mm (9.9 in)	12 October 1962
Nov	190.0 mm (7.5 in)	23 November 1988
Dec	219.7 mm (8.6 in)	22 December 1964

Period of Record Coverage

1970 to 1981

4 years of record at Challenge Rs, 1970 to 1981. 4 years have data for under 90 percent of days and are left out of rankings: 1970, 1979, 1980, 1981.

Latest Records

Latest records at Challenge Rs
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
25 April 1994	Challenge Rs, US	daily snowfall	2.5 cm (1.0 in)	2.5 cm (1.0 in)	49 years	20 of 100 (Routine)
11 April 1994	Challenge Rs, US	daily rain	37.8 mm (1.5 in)	6.8 mm (0.27 in)	27 years	16 of 100 (Routine)
22 February 1994	Challenge Rs, US	daily rain	84.8 mm (3.3 in)	43.4 mm (1.7 in)	38 years	29 of 100 (Routine)
8 December 1993	Challenge Rs, US	daily rain	37.1 mm (1.5 in)	4.3 mm (0.17 in)	43 years	18 of 100 (Routine)
16 August 1993	Challenge Rs, US	monthly rain	34.5 mm (1.4 in)	2.2 mm (0.09 in)	28 years	26 of 100 (Routine)
17 March 1993	Challenge Rs, US	daily rain	70.4 mm (2.8 in)	20.9 mm (0.8 in)	44 years	26 of 100 (Routine)
1 January 1993	Challenge Rs, US	daily rain	96.0 mm (3.8 in)	21.1 mm (0.8 in)	53 years	26 of 100 (Routine)
11 December 1992	Challenge Rs, US	daily rain	115.8 mm (4.6 in)	14.2 mm (0.6 in)	55 years	25 of 100 (Routine)
9 December 1992	Challenge Rs, US	daily rain	215.9 mm (8.5 in)	179.1 mm (7.1 in)	42 years	57 of 100 (Notable)
21 October 1992	Challenge Rs, US	daily rain	88.4 mm (3.5 in)	54.6 mm (2.1 in)	49 years	37 of 100 (Notable)
30 June 1992	Challenge Rs, US	daily rain	34.5 mm (1.4 in)	34.5 mm (1.4 in)	53 years	60 of 100 (Major)
15 June 1992	Challenge Rs, US	daily rain	10.9 mm (0.4 in)	10.6 mm (0.4 in)	48 years	20 of 100 (Routine)
29 June 1991	Challenge Rs, US	monthly rain	38.1 mm (1.5 in)	0.8 mm (0.03 in)	48 years	30 of 100 (Routine)
28 June 1991	Challenge Rs, US	daily rain	14.2 mm (0.6 in)	11.7 mm (0.5 in)	12 years	20 of 100 (Routine)
17 May 1991	Challenge Rs, US	daily rain	26.7 mm (1.1 in)	6.6 mm (0.26 in)	45 years	23 of 100 (Routine)
27 March 1991	Challenge Rs, US	daily snowfall	7.6 cm (3.0 in)	7.6 cm (3.0 in)	46 years	30 of 100 (Routine)
26 March 1991	Challenge Rs, US	daily snowfall	25.4 cm (10.0 in)	10.2 cm (4.0 in)	45 years	32 of 100 (Routine)
15 March 1991	Challenge Rs, US	daily snowfall	12.7 cm (5.0 in)	5.1 cm (2.0 in)	28 years	20 of 100 (Routine)
13 March 1991	Challenge Rs, US	daily snowfall	20.3 cm (8.0 in)	17.8 cm (7.0 in)	38 years	41 of 100 (Notable)
13 March 1991	Challenge Rs, US	daily rain	73.7 mm (2.9 in)	4.6 mm (0.18 in)	22 years	12 of 100 (Routine)

Extremes by Year

1937 to 1994

Yearly extremes at Challenge Rs: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	37.2 C (99.0 F)	1981	30.9 C (87.5 F)	4
Coldest night (TNn)	-6.1 C (21.0 F)	1970	-3.6 C (25.5 F)	4
Wettest day (Rx1day)	252.2 mm (9.9 in)	1962	114.3 mm (4.5 in)	58
Wettest five days (Rx5day)	640.3 mm (25.2 in)	1962	250.1 mm (9.8 in)	58
Longest dry spell (CDD)	138 days	1985	78 days	58

Hottest day (TXx)

The hottest day of the year at Challenge Rs, 1937 to 1994. The record is 37.2 C (99.0 F) in 1981, marked on the chart; the median year is 30.9 C (87.5 F).

Hottest day (TXx) at Challenge Rs by year
Year	Hottest day (TXx)
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
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	19.4 C (66.9 F)
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	33.9 C (93.0 F)
1980	27.8 C (82.0 F)
1981	37.2 C (99.0 F)
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a

Coldest night (TNn)

The coldest night of the year at Challenge Rs, 1937 to 1994. The record is -6.1 C (21.0 F) in 1970, marked on the chart; the median year is -3.6 C (25.5 F).

Coldest night (TNn) at Challenge Rs by year
Year	Coldest night (TNn)
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
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	-6.1 C (21.0 F)
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	-5.0 C (23.0 F)
1980	-2.2 C (28.0 F)
1981	3.9 C (39.0 F)
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a

Wettest day (Rx1day)

The wettest day of the year at Challenge Rs, 1937 to 1994. The record is 252.2 mm (9.9 in) in 1962, marked on the chart; the median year is 114.3 mm (4.5 in).

Wettest day (Rx1day) at Challenge Rs by year
Year	Wettest day (Rx1day)
1937	160.0 mm (6.3 in)
1938	138.9 mm (5.5 in)
1939	65.5 mm (2.6 in)
1940	179.1 mm (7.1 in)
1941	114.0 mm (4.5 in)
1942	147.3 mm (5.8 in)
1943	152.4 mm (6.0 in)
1944	163.1 mm (6.4 in)
1945	119.9 mm (4.7 in)
1946	101.6 mm (4.0 in)
1947	108.5 mm (4.3 in)
1948	107.4 mm (4.2 in)
1949	85.6 mm (3.4 in)
1950	117.1 mm (4.6 in)
1951	98.0 mm (3.9 in)
1952	108.5 mm (4.3 in)
1953	152.7 mm (6.0 in)
1954	154.4 mm (6.1 in)
1955	192.0 mm (7.6 in)
1956	81.8 mm (3.2 in)
1957	97.8 mm (3.9 in)
1958	90.9 mm (3.6 in)
1959	85.6 mm (3.4 in)
1960	231.4 mm (9.1 in)
1961	75.2 mm (3.0 in)
1962	252.2 mm (9.9 in)
1963	144.5 mm (5.7 in)
1964	219.7 mm (8.6 in)
1965	95.8 mm (3.8 in)
1966	135.9 mm (5.4 in)
1967	186.9 mm (7.4 in)
1968	79.2 mm (3.1 in)
1969	125.7 mm (4.9 in)
1970	174.8 mm (6.9 in)
1971	113.8 mm (4.5 in)
1972	75.2 mm (3.0 in)
1973	117.1 mm (4.6 in)
1974	104.1 mm (4.1 in)
1975	172.7 mm (6.8 in)
1976	34.3 mm (1.4 in)
1977	132.1 mm (5.2 in)
1978	96.3 mm (3.8 in)
1979	104.6 mm (4.1 in)
1980	74.9 mm (2.9 in)
1981	104.1 mm (4.1 in)
1982	208.5 mm (8.2 in)
1983	95.8 mm (3.8 in)
1984	75.7 mm (3.0 in)
1985	169.7 mm (6.7 in)
1986	92.7 mm (3.6 in)
1987	118.1 mm (4.6 in)
1988	190.0 mm (7.5 in)
1989	117.3 mm (4.6 in)
1990	57.2 mm (2.3 in)
1991	73.7 mm (2.9 in)
1992	215.9 mm (8.5 in)
1993	114.6 mm (4.5 in)
1994	93.2 mm (3.7 in)

Wettest five days (Rx5day)

The wettest five days of the year at Challenge Rs, 1937 to 1994. The record is 640.3 mm (25.2 in) in 1962, marked on the chart; the median year is 250.1 mm (9.8 in).

Wettest five days (Rx5day) at Challenge Rs by year
Year	Wettest five days (Rx5day)
1937	417.0 mm (16.4 in)
1938	337.8 mm (13.3 in)
1939	101.1 mm (4.0 in)
1940	412.0 mm (16.2 in)
1941	322.6 mm (12.7 in)
1942	320.0 mm (12.6 in)
1943	312.4 mm (12.3 in)
1944	232.7 mm (9.2 in)
1945	379.0 mm (14.9 in)
1946	258.3 mm (10.2 in)
1947	191.7 mm (7.5 in)
1948	185.9 mm (7.3 in)
1949	173.5 mm (6.8 in)
1950	419.8 mm (16.5 in)
1951	259.8 mm (10.2 in)
1952	273.3 mm (10.8 in)
1953	287.3 mm (11.3 in)
1954	214.1 mm (8.4 in)
1955	535.7 mm (21.1 in)
1956	269.0 mm (10.6 in)
1957	270.5 mm (10.6 in)
1958	307.1 mm (12.1 in)
1959	238.5 mm (9.4 in)
1960	318.8 mm (12.6 in)
1961	197.2 mm (7.8 in)
1962	640.3 mm (25.2 in)
1963	323.0 mm (12.7 in)
1964	564.6 mm (22.2 in)
1965	351.5 mm (13.8 in)
1966	235.8 mm (9.3 in)
1967	358.4 mm (14.1 in)
1968	182.6 mm (7.2 in)
1969	400.3 mm (15.8 in)
1970	376.9 mm (14.8 in)
1971	198.9 mm (7.8 in)
1972	148.3 mm (5.8 in)
1973	304.2 mm (12.0 in)
1974	221.2 mm (8.7 in)
1975	179.0 mm (7.0 in)
1976	40.6 mm (1.6 in)
1977	193.8 mm (7.6 in)
1978	132.9 mm (5.2 in)
1979	216.9 mm (8.5 in)
1980	151.7 mm (6.0 in)
1981	259.4 mm (10.2 in)
1982	315.7 mm (12.4 in)
1983	78.7 mm (3.1 in)
1984	69.9 mm (2.8 in)
1985	335.6 mm (13.2 in)
1986	146.5 mm (5.8 in)
1987	174.6 mm (6.9 in)
1988	152.2 mm (6.0 in)
1989	281.1 mm (11.1 in)
1990	109.2 mm (4.3 in)
1991	113.0 mm (4.4 in)
1992	122.7 mm (4.8 in)
1993	241.9 mm (9.5 in)
1994	147.1 mm (5.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at Challenge Rs, 1937 to 1994. The record is 138 days in 1985, marked on the chart; the median year is 78 days.

Longest dry spell (CDD) at Challenge Rs by year
Year	Longest dry spell (CDD)
1937	11 days
1938	27 days
1939	87 days
1940	95 days
1941	68 days
1942	103 days
1943	118 days
1944	105 days
1945	109 days
1946	59 days
1947	100 days
1948	76 days
1949	99 days
1950	102 days
1951	76 days
1952	61 days
1953	46 days
1954	42 days
1955	105 days
1956	129 days
1957	108 days
1958	101 days
1959	86 days
1960	78 days
1961	66 days
1962	73 days
1963	79 days
1964	56 days
1965	53 days
1966	66 days
1967	96 days
1968	70 days
1969	118 days
1970	110 days
1971	64 days
1972	107 days
1973	110 days
1974	89 days
1975	49 days
1976	64 days
1977	54 days
1978	68 days
1979	72 days
1980	52 days
1981	114 days
1982	37 days
1983	66 days
1984	84 days
1985	138 days
1986	78 days
1987	95 days
1988	127 days
1989	60 days
1990	113 days
1991	67 days
1992	79 days
1993	69 days
1994	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

45 years, 1939 to 1993

A day with at least 114.1 mm (4.5 in) of rain is expected about once in 2 years. A day with at least 278.6 mm (11.0 in) of rain is expected about once in 100 years.

Rainfall return levels at Challenge Rs: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	114.1 mm (4.5 in)
5 years	156.8 mm (6.2 in)
10 years	185.7 mm (7.3 in)
25 years	222.7 mm (8.8 in)
50 years	250.5 mm (9.9 in)	Longer than the 45 years of record
100 years	278.6 mm (11.0 in)	Longer than the 45 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, 45 years of values from 1939 to 1993.

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: 252.2 mm (9.9 in) in 1962; 231.4 mm (9.1 in) in 1960; 219.7 mm (8.6 in) in 1964.

Download the Data

Data for Challenge Rs standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Challenge 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 2026-10-14 (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).