Walnut Ni Fc102C Weather Records (USC00049431)

Record envelope, standing records and threshold days for Walnut Ni Fc102C (USC00049431), California, United States, with 74 years of record.

Key Facts for Walnut Ni Fc102C

Walnut Ni Fc102C (USC00049431) is a weather station in California, United States at 34.00 latitude and -117.87 longitude, 149 m (488 ft) above sea level.
The station reports from 1927 to 2000, 74 years of record.
0 records set at Walnut Ni Fc102C still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Walnut Ni Fc102C set a daily record precipitation of 28.7 mm (1.1 in) on 18 April 2000.

About the Station

Location: California, United States, 34.00 latitude, -117.87 longitude.
Elevation: 149 m (488 ft).
Period of record: 1927 to 2000, 74 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 Walnut Ni Fc102C. 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 Walnut Ni Fc102C, 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	n/a	n/a	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	n/a	n/a	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	n/a	n/a	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a

Which Years Hold Standing Records

0 standing records

0 records at Walnut Ni Fc102C still stand.

Wettest Day of Each Month

Mar: 152.4 mm (6.0 in)

The wettest day on record for each calendar month at Walnut Ni Fc102C. The most was 152.4 mm (6.0 in) on 2 March 1938.

Record daily precipitation for each month at Walnut Ni Fc102C
Month	Record daily precipitation (mm)	Date
Jan	142.5 mm (5.6 in)	26 January 1956
Feb	114.3 mm (4.5 in)	9 February 1932
Mar	152.4 mm (6.0 in)	2 March 1938
Apr	50.0 mm (2.0 in)	1 April 1965
May	42.4 mm (1.7 in)	28 May 1990
Jun	41.9 mm (1.6 in)	6 June 1993
Jul	5.1 mm (0.20 in)	28 July 1968
Aug	51.3 mm (2.0 in)	19 August 1983
Sep	142.2 mm (5.6 in)	25 September 1939
Oct	71.6 mm (2.8 in)	18 October 1934
Nov	109.7 mm (4.3 in)	22 November 1996
Dec	103.6 mm (4.1 in)	31 December 1933

Latest Records

Latest records at Walnut Ni Fc102C
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 April 2000	Walnut Ni Fc102C, US	daily rain	28.7 mm (1.1 in)	11.2 mm (0.4 in)	17 years	23 of 100 (Routine)
9 July 1999	Walnut Ni Fc102C, US	daily rain	2.3 mm (0.09 in)	2.0 mm (0.08 in)	48 years	20 of 100 (Routine)
4 June 1999	Walnut Ni Fc102C, US	daily rain	1.3 mm (0.05 in)	1.3 mm (0.05 in)	70 years	20 of 100 (Routine)
2 June 1999	Walnut Ni Fc102C, US	daily rain	7.1 mm (0.28 in)	7.1 mm (0.28 in)	70 years	20 of 100 (Routine)
28 November 1998	Walnut Ni Fc102C, US	daily rain	4.8 mm (0.19 in)	2.3 mm (0.09 in)	68 years	20 of 100 (Routine)
8 November 1998	Walnut Ni Fc102C, US	daily rain	10.9 mm (0.4 in)	3.3 mm (0.13 in)	45 years	20 of 100 (Routine)
3 September 1998	Walnut Ni Fc102C, US	daily rain	22.1 mm (0.9 in)	16.8 mm (0.7 in)	67 years	20 of 100 (Routine)
1 September 1998	Walnut Ni Fc102C, US	daily rain	1.0 mm (0.04 in)	1.0 mm (0.04 in)	68 years	20 of 100 (Routine)
13 June 1998	Walnut Ni Fc102C, US	daily rain	0.3 mm (0.01 in)	0.3 mm (0.01 in)	69 years	20 of 100 (Routine)
12 June 1998	Walnut Ni Fc102C, US	daily rain	1.0 mm (0.04 in)	1.0 mm (0.04 in)	69 years	20 of 100 (Routine)
14 May 1998	Walnut Ni Fc102C, US	daily rain	12.7 mm (0.5 in)	4.6 mm (0.18 in)	47 years	20 of 100 (Routine)
13 May 1998	Walnut Ni Fc102C, US	daily rain	25.9 mm (1.0 in)	25.9 mm (1.0 in)	68 years	61 of 100 (Major)
6 May 1998	Walnut Ni Fc102C, US	daily rain	8.1 mm (0.32 in)	3.3 mm (0.13 in)	24 years	18 of 100 (Routine)
26 March 1998	Walnut Ni Fc102C, US	daily rain	43.2 mm (1.7 in)	13.2 mm (0.5 in)	4 years	15 of 100 (Routine)
24 February 1998	Walnut Ni Fc102C, US	daily rain	87.9 mm (3.5 in)	17.5 mm (0.7 in)	28 years	23 of 100 (Routine)
22 February 1998	Walnut Ni Fc102C, US	daily rain	37.6 mm (1.5 in)	20.1 mm (0.8 in)	2 years	16 of 100 (Routine)
10 January 1998	Walnut Ni Fc102C, US	daily rain	81.0 mm (3.2 in)	46.7 mm (1.8 in)	43 years	43 of 100 (Notable)
6 December 1997	Walnut Ni Fc102C, US	daily rain	45.7 mm (1.8 in)	2.3 mm (0.09 in)	31 years	17 of 100 (Routine)
27 November 1997	Walnut Ni Fc102C, US	daily rain	22.9 mm (0.9 in)	6.9 mm (0.27 in)	67 years	20 of 100 (Routine)
27 January 1997	Walnut Ni Fc102C, US	daily rain	40.6 mm (1.6 in)	16.7 mm (0.7 in)	41 years	27 of 100 (Routine)

Extremes by Year

1927 to 2000

Yearly extremes at Walnut Ni Fc102C: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Wettest day (Rx1day)	152.4 mm (6.0 in)	1938	53.3 mm (2.1 in)	67
Wettest five days (Rx5day)	312.8 mm (12.3 in)	1980	105.1 mm (4.1 in)	67
Longest dry spell (CDD)	239 days	1973	120 days	67

Wettest day (Rx1day)

The wettest day of the year at Walnut Ni Fc102C, 1927 to 2000. The record is 152.4 mm (6.0 in) in 1938, marked on the chart; the median year is 53.3 mm (2.1 in).

Wettest day (Rx1day) at Walnut Ni Fc102C by year
Year	Wettest day (Rx1day)
1927	30.5 mm (1.2 in)
1928	5.1 mm (0.20 in)
1929	27.9 mm (1.1 in)
1930	43.2 mm (1.7 in)
1931	71.1 mm (2.8 in)
1932	114.3 mm (4.5 in)
1933	103.6 mm (4.1 in)
1934	104.1 mm (4.1 in)
1935	44.7 mm (1.8 in)
1936	51.3 mm (2.0 in)
1937	101.6 mm (4.0 in)
1938	152.4 mm (6.0 in)
1939	142.2 mm (5.6 in)
1940	76.2 mm (3.0 in)
1941	76.2 mm (3.0 in)
1949	35.6 mm (1.4 in)
1950	47.8 mm (1.9 in)
1951	83.6 mm (3.3 in)
1952	120.7 mm (4.8 in)
1953	21.6 mm (0.9 in)
1954	66.3 mm (2.6 in)
1955	34.3 mm (1.4 in)
1956	142.5 mm (5.6 in)
1957	42.9 mm (1.7 in)
1958	70.1 mm (2.8 in)
1959	53.3 mm (2.1 in)
1960	40.1 mm (1.6 in)
1961	42.9 mm (1.7 in)
1962	74.7 mm (2.9 in)
1963	97.0 mm (3.8 in)
1964	28.2 mm (1.1 in)
1965	74.2 mm (2.9 in)
1966	64.5 mm (2.5 in)
1967	66.0 mm (2.6 in)
1968	97.0 mm (3.8 in)
1969	89.4 mm (3.5 in)
1970	64.8 mm (2.6 in)
1971	41.9 mm (1.6 in)
1972	31.8 mm (1.3 in)
1973	47.8 mm (1.9 in)
1974	69.6 mm (2.7 in)
1975	45.0 mm (1.8 in)
1976	45.2 mm (1.8 in)
1977	40.6 mm (1.6 in)
1978	88.4 mm (3.5 in)
1979	86.9 mm (3.4 in)
1980	99.1 mm (3.9 in)
1981	34.0 mm (1.3 in)
1982	48.0 mm (1.9 in)
1983	103.1 mm (4.1 in)
1984	43.7 mm (1.7 in)
1985	31.2 mm (1.2 in)
1986	65.5 mm (2.6 in)
1987	90.9 mm (3.6 in)
1988	57.9 mm (2.3 in)
1989	16.8 mm (0.7 in)
1990	42.9 mm (1.7 in)
1991	50.8 mm (2.0 in)
1992	50.8 mm (2.0 in)
1993	50.8 mm (2.0 in)
1994	42.4 mm (1.7 in)
1995	95.8 mm (3.8 in)
1996	109.7 mm (4.3 in)
1997	45.7 mm (1.8 in)
1998	87.9 mm (3.5 in)
1999	29.2 mm (1.1 in)
2000	38.9 mm (1.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Walnut Ni Fc102C, 1927 to 2000. The record is 312.8 mm (12.3 in) in 1980, marked on the chart; the median year is 105.1 mm (4.1 in).

Wettest five days (Rx5day) at Walnut Ni Fc102C by year
Year	Wettest five days (Rx5day)
1927	50.6 mm (2.0 in)
1928	14.7 mm (0.6 in)
1929	27.9 mm (1.1 in)
1930	118.6 mm (4.7 in)
1931	87.1 mm (3.4 in)
1932	114.3 mm (4.5 in)
1933	120.6 mm (4.7 in)
1934	224.7 mm (8.8 in)
1935	44.7 mm (1.8 in)
1936	138.9 mm (5.5 in)
1937	109.5 mm (4.3 in)
1938	279.6 mm (11.0 in)
1939	147.3 mm (5.8 in)
1940	100.1 mm (3.9 in)
1941	136.8 mm (5.4 in)
1949	68.9 mm (2.7 in)
1950	60.8 mm (2.4 in)
1951	120.8 mm (4.8 in)
1952	158.8 mm (6.3 in)
1953	31.2 mm (1.2 in)
1954	86.9 mm (3.4 in)
1955	57.1 mm (2.2 in)
1956	194.9 mm (7.7 in)
1957	69.9 mm (2.8 in)
1958	105.1 mm (4.1 in)
1959	56.4 mm (2.2 in)
1960	71.7 mm (2.8 in)
1961	55.8 mm (2.2 in)
1962	162.0 mm (6.4 in)
1963	123.9 mm (4.9 in)
1964	39.3 mm (1.5 in)
1965	122.2 mm (4.8 in)
1966	160.8 mm (6.3 in)
1967	148.3 mm (5.8 in)
1968	100.6 mm (4.0 in)
1969	186.7 mm (7.4 in)
1970	116.9 mm (4.6 in)
1971	110.4 mm (4.3 in)
1972	76.0 mm (3.0 in)
1973	96.8 mm (3.8 in)
1974	203.4 mm (8.0 in)
1975	86.2 mm (3.4 in)
1976	95.5 mm (3.8 in)
1977	94.1 mm (3.7 in)
1978	245.1 mm (9.6 in)
1979	131.6 mm (5.2 in)
1980	312.8 mm (12.3 in)
1981	65.4 mm (2.6 in)
1982	109.4 mm (4.3 in)
1983	261.9 mm (10.3 in)
1984	92.7 mm (3.6 in)
1985	53.8 mm (2.1 in)
1986	112.4 mm (4.4 in)
1987	106.7 mm (4.2 in)
1988	57.9 mm (2.3 in)
1989	16.8 mm (0.7 in)
1990	87.8 mm (3.5 in)
1991	78.2 mm (3.1 in)
1992	130.3 mm (5.1 in)
1993	151.6 mm (6.0 in)
1994	70.8 mm (2.8 in)
1995	156.6 mm (6.2 in)
1996	114.8 mm (4.5 in)
1997	75.0 mm (3.0 in)
1998	164.7 mm (6.5 in)
1999	37.6 mm (1.5 in)
2000	98.7 mm (3.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Walnut Ni Fc102C, 1927 to 2000. The record is 239 days in 1973, marked on the chart; the median year is 120 days.

Longest dry spell (CDD) at Walnut Ni Fc102C by year
Year	Longest dry spell (CDD)
1927	9 days
1928	92 days
1929	104 days
1930	38 days
1931	68 days
1932	68 days
1933	117 days
1934	65 days
1935	31 days
1936	29 days
1937	28 days
1938	43 days
1939	28 days
1940	25 days
1941	61 days
1949	173 days
1950	217 days
1951	136 days
1952	142 days
1953	197 days
1954	109 days
1955	166 days
1956	146 days
1957	92 days
1958	127 days
1959	124 days
1960	158 days
1961	211 days
1962	154 days
1963	84 days
1964	152 days
1965	110 days
1966	187 days
1967	114 days
1968	116 days
1969	116 days
1970	218 days
1971	140 days
1972	84 days
1973	239 days
1974	153 days
1975	164 days
1976	88 days
1977	79 days
1978	132 days
1979	124 days
1980	69 days
1981	126 days
1982	120 days
1983	96 days
1984	118 days
1985	92 days
1986	170 days
1987	108 days
1988	121 days
1989	169 days
1990	175 days
1991	208 days
1992	103 days
1993	126 days
1994	145 days
1995	179 days
1996	194 days
1997	226 days
1998	80 days
1999	122 days
2000	52 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

49 years, 1949 to 1999

A day with at least 55.1 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 155.5 mm (6.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Walnut Ni Fc102C: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	55.1 mm (2.2 in)
5 years	80.0 mm (3.1 in)
10 years	97.3 mm (3.8 in)
25 years	120.0 mm (4.7 in)
50 years	137.5 mm (5.4 in)	Longer than the 49 years of record
100 years	155.5 mm (6.1 in)	Longer than the 49 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, 49 years of values from 1949 to 1999.

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: 142.5 mm (5.6 in) in 1956; 120.7 mm (4.8 in) in 1952; 109.7 mm (4.3 in) in 1996.

Download the Data

Data for Walnut Ni Fc102C standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Walnut Ni Fc102C 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).

Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	n/a	n/a	n/a
Feb	n/a	n/a	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	n/a	n/a	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	n/a	n/a	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a

Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	n/a	n/a	n/a
Feb	n/a	n/a	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	n/a	n/a	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	n/a	n/a	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a