Walnut Creek 2 ESE Weather Records (USC00049423)

Record envelope, standing records and threshold days for Walnut Creek 2 ESE (USC00049423), California, United States, with 82 years of record.

Key Facts for Walnut Creek 2 ESE

Walnut Creek 2 ESE (USC00049423) is a weather station in California, United States at 37.88 latitude and -122.03 longitude, 75 m (245 ft) above sea level.
The station reports from 1893 to 1974, 82 years of record.
1,464 records set at Walnut Creek 2 ESE still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Walnut Creek 2 ESE tied a daily record high maximum temperature of 36.1 C (97.0 F) on 27 May 1974.

About the Station

Location: California, United States, 37.88 latitude, -122.03 longitude.
Elevation: 75 m (245 ft).
Period of record: 1893 to 1974, 82 years.
Eligible elements: tmax, tmin, 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 Walnut Creek 2 ESE. 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 Creek 2 ESE, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	26.7 C (80.1 F)	-8.3 C (17.1 F)	n/a	n/a
Feb	28.3 C (82.9 F)	-6.1 C (21.0 F)	n/a	n/a
Mar	36.1 C (97.0 F)	-4.4 C (24.1 F)	n/a	n/a
Apr	34.4 C (93.9 F)	-2.2 C (28.0 F)	n/a	n/a
May	39.4 C (102.9 F)	0.0 C (32.0 F)	n/a	n/a
Jun	42.8 C (109.0 F)	1.1 C (34.0 F)	n/a	n/a
Jul	46.1 C (115.0 F)	3.3 C (37.9 F)	n/a	n/a
Aug	44.4 C (111.9 F)	5.0 C (41.0 F)	n/a	n/a
Sep	45.6 C (114.1 F)	2.2 C (36.0 F)	n/a	n/a
Oct	38.3 C (100.9 F)	-2.8 C (27.0 F)	n/a	n/a
Nov	31.7 C (89.1 F)	-5.0 C (23.0 F)	n/a	n/a
Dec	24.4 C (75.9 F)	-7.8 C (18.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Walnut Creek 2 ESE still stand. 1915 holds the most, with 94.

Standing records at Walnut Creek 2 ESE by the year they were set
Year set	Standing records
1893	21
1894	40
1895	35
1896	67
1897	30
1898	45
1899	62
1900	36
1914	60
1915	94
1947	7
1948	35
1949	56
1950	58
1951	31
1952	34
1953	38
1954	35
1955	35
1956	30
1957	28
1958	34
1959	32
1960	32
1961	43
1962	24
1963	47
1964	45
1965	41
1966	33
1967	34
1968	33
1969	24
1970	45
1971	28
1972	34
1973	42
1974	16

All-Time Record Progression

2 new records

2 all-time records were set at Walnut Creek 2 ESE between 13 October 1962 and 14 July 1972. Each dot is a new record.

When Walnut Creek 2 ESE set new all-time records
Date	Kind	Detail
1962-10-13	Record daily precipitation	Record daily precipitation 106.7 mm (4.2 in)
1972-07-14	Record high maximum temperature	Record high maximum temperature 46.1 C (115.0 F)

Wettest Day of Each Month

Oct: 106.7 mm (4.2 in)

The wettest day on record for each calendar month at Walnut Creek 2 ESE. The most was 106.7 mm (4.2 in) on 13 October 1962.

Record daily precipitation for each month at Walnut Creek 2 ESE
Month	Record daily precipitation (mm)	Date
Jan	88.9 mm (3.5 in)	4 January 1895
Feb	91.4 mm (3.6 in)	11 February 1919
Mar	54.9 mm (2.2 in)	1 March 1974
Apr	66.0 mm (2.6 in)	3 April 1958
May	35.6 mm (1.4 in)	15 May 1942
Jun	13.0 mm (0.5 in)	5 June 1934
Jul	3.8 mm (0.15 in)	31 July 1949
Aug	25.9 mm (1.0 in)	30 August 1896
Sep	66.0 mm (2.6 in)	13 September 1918
Oct	106.7 mm (4.2 in)	13 October 1962
Nov	72.4 mm (2.9 in)	21 November 1900
Dec	83.3 mm (3.3 in)	23 December 1955

Period of Record Coverage

1893 to 1974

38 years of record at Walnut Creek 2 ESE, 1893 to 1974. 4 years have data for under 90 percent of days and are left out of rankings: 1895, 1900, 1947, 1974.

Days with data per year at Walnut Creek 2 ESE
Year	Days with data	Share of year	Complete
1893	360	99%	Yes
1894	365	100%	Yes
1895	304	83%	No
1896	365	100%	Yes
1897	334	92%	Yes
1898	364	100%	Yes
1899	334	92%	Yes
1900	302	83%	No
1914	338	93%	Yes
1915	356	98%	Yes
1947	83	23%	No
1948	333	91%	Yes
1949	358	98%	Yes
1950	361	99%	Yes
1951	365	100%	Yes
1952	364	99%	Yes
1953	362	99%	Yes
1954	365	100%	Yes
1955	333	91%	Yes
1956	366	100%	Yes
1957	364	100%	Yes
1958	364	100%	Yes
1959	365	100%	Yes
1960	366	100%	Yes
1961	365	100%	Yes
1962	365	100%	Yes
1963	364	100%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	363	99%	Yes
1968	360	98%	Yes
1969	364	100%	Yes
1970	365	100%	Yes
1971	364	100%	Yes
1972	363	99%	Yes
1973	363	99%	Yes
1974	147	40%	No

Latest Records

Latest records at Walnut Creek 2 ESE
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
27 May 1974	Walnut Creek 2 ESE, US	daily high max (Tie)	36.1 C (97.0 F)	tie	23 years	3 of 100 (Routine)
21 May 1974	Walnut Creek 2 ESE, US	daily low min	1.7 C (35.1 F)	0.5 C (0.9 F)	13 years	13 of 100 (Routine)
20 May 1974	Walnut Creek 2 ESE, US	daily low min	0.6 C (33.1 F)	1.6 C (2.9 F)	12 years	16 of 100 (Routine)
19 May 1974	Walnut Creek 2 ESE, US	daily low min	1.1 C (34.0 F)	3.3 C (5.9 F)	59 years	36 of 100 (Notable)
18 May 1974	Walnut Creek 2 ESE, US	daily low min	1.7 C (35.1 F)	1.6 C (2.9 F)	15 years	17 of 100 (Routine)
17 May 1974	Walnut Creek 2 ESE, US	daily low min	2.2 C (36.0 F)	1.1 C (2.0 F)	79 years	34 of 100 (Routine)
16 May 1974	Walnut Creek 2 ESE, US	daily low min	2.2 C (36.0 F)	0.6 C (1.1 F)	79 years	33 of 100 (Routine)
8 May 1974	Walnut Creek 2 ESE, US	daily high max (Tie)	31.7 C (89.1 F)	tie	79 years	7 of 100 (Routine)
25 April 1974	Walnut Creek 2 ESE, US	daily low min	1.1 C (34.0 F)	0.6 C (1.1 F)	9 years	11 of 100 (Routine)
10 April 1974	Walnut Creek 2 ESE, US	daily low min	0.6 C (33.1 F)	2.2 C (4.0 F)	24 years	22 of 100 (Routine)
1 April 1974	Walnut Creek 2 ESE, US	daily high min (Tie)	10.0 C (50.0 F)	tie	59 years	6 of 100 (Routine)
30 March 1974	Walnut Creek 2 ESE, US	daily high min	11.7 C (53.1 F)	2.3 C (4.1 F)	79 years	37 of 100 (Notable)
29 March 1974	Walnut Creek 2 ESE, US	daily high min	13.3 C (55.9 F)	2.7 C (4.9 F)	23 years	21 of 100 (Routine)
28 March 1974	Walnut Creek 2 ESE, US	daily high min (Tie)	10.6 C (51.1 F)	tie	74 years	7 of 100 (Routine)
9 March 1974	Walnut Creek 2 ESE, US	daily low min	-1.1 C (30.0 F)	0.5 C (0.9 F)	21 years	15 of 100 (Routine)
1 March 1974	Walnut Creek 2 ESE, US	monthly rain	54.9 mm (2.2 in)	0.3 mm (0.01 in)	76 years	41 of 100 (Notable)
24 February 1974	Walnut Creek 2 ESE, US	daily low min	-3.3 C (26.1 F)	1.1 C (2.0 F)	8 years	12 of 100 (Routine)
16 January 1974	Walnut Creek 2 ESE, US	daily high min	13.3 C (55.9 F)	1.1 C (2.0 F)	74 years	32 of 100 (Routine)
15 January 1974	Walnut Creek 2 ESE, US	daily high max	19.4 C (66.9 F)	1.1 C (2.0 F)	8 years	13 of 100 (Routine)
8 January 1974	Walnut Creek 2 ESE, US	daily low min (Tie)	-3.9 C (25.0 F)	tie	19 years	3 of 100 (Routine)

Climate Trend

29 complete years, 1893 to 1973

One stripe for each of 29 complete years at Walnut Creek 2 ESE, 1893 to 1973. Blue stripes are years cooler than the station's own mean of 14.7 C (58.5 F); red stripes are warmer. The coolest year was 1915, at 13.7 C (56.6 F), and the warmest was 1896, at 16.4 C (61.5 F). The strongest colour marks a difference of 1.7 C (3.1 F).

Annual mean temperature at Walnut Creek 2 ESE as warming stripes, 1893 to 1973
Year	Annual mean temperature	Difference from the station mean
1893	14.9 C	+0.19 C
1894	14.6 C	-0.10 C
1896	16.4 C	+1.68 C
1898	16.0 C	+1.26 C
1915	13.7 C	-1.07 C
1949	14.4 C	-0.34 C
1950	15.5 C	+0.77 C
1951	14.6 C	-0.09 C
1952	14.6 C	-0.10 C
1953	14.9 C	+0.13 C
1954	14.3 C	-0.39 C
1956	14.3 C	-0.42 C
1957	14.8 C	+0.02 C
1958	15.5 C	+0.81 C
1959	15.2 C	+0.50 C
1960	14.5 C	-0.20 C
1961	14.4 C	-0.36 C
1962	14.1 C	-0.62 C
1963	13.9 C	-0.80 C
1964	14.0 C	-0.75 C
1965	13.8 C	-0.97 C
1966	14.3 C	-0.41 C
1967	14.2 C	-0.52 C
1968	14.4 C	-0.30 C
1969	15.2 C	+0.46 C
1970	15.4 C	+0.71 C
1971	14.8 C	+0.07 C
1972	15.2 C	+0.43 C
1973	15.1 C	+0.36 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 1974

Yearly extremes at Walnut Creek 2 ESE: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	46.1 C (115.0 F)	1972	41.1 C (106.0 F)	38
Coldest night (TNn)	-8.3 C (17.1 F)	1949	-4.4 C (24.1 F)	38
Wettest day (Rx1day)	106.7 mm (4.2 in)	1962	47.0 mm (1.9 in)	69
Wettest five days (Rx5day)	272.8 mm (10.7 in)	1962	91.7 mm (3.6 in)	69
Longest dry spell (CDD)	176 days	1955	107 days	69

Hottest day (TXx)

The hottest day of the year at Walnut Creek 2 ESE, 1893 to 1974. The record is 46.1 C (115.0 F) in 1972, marked on the chart; the median year is 41.1 C (106.0 F).

Hottest day (TXx) at Walnut Creek 2 ESE by year
Year	Hottest day (TXx)
1893	40.0 C (104.0 F)
1894	42.8 C (109.0 F)
1895	41.1 C (106.0 F)
1896	41.1 C (106.0 F)
1897	42.2 C (108.0 F)
1898	42.8 C (109.0 F)
1899	40.6 C (105.1 F)
1900	38.9 C (102.0 F)
1912	n/a
1913	n/a
1914	37.8 C (100.0 F)
1915	40.0 C (104.0 F)
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	28.9 C (84.0 F)
1948	42.2 C (108.0 F)
1949	42.2 C (108.0 F)
1950	45.6 C (114.1 F)
1951	42.2 C (108.0 F)
1952	40.6 C (105.1 F)
1953	41.1 C (106.0 F)
1954	42.2 C (108.0 F)
1955	42.8 C (109.0 F)
1956	40.6 C (105.1 F)
1957	41.1 C (106.0 F)
1958	39.4 C (102.9 F)
1959	41.1 C (106.0 F)
1960	41.7 C (107.1 F)
1961	42.8 C (109.0 F)
1962	38.9 C (102.0 F)
1963	38.3 C (100.9 F)
1964	39.4 C (102.9 F)
1965	36.7 C (98.1 F)
1966	40.0 C (104.0 F)
1967	39.4 C (102.9 F)
1968	39.4 C (102.9 F)
1969	40.6 C (105.1 F)
1970	41.1 C (106.0 F)
1971	43.9 C (111.0 F)
1972	46.1 C (115.0 F)
1973	42.8 C (109.0 F)
1974	38.3 C (100.9 F)

Coldest night (TNn)

The coldest night of the year at Walnut Creek 2 ESE, 1893 to 1974. The record is -8.3 C (17.1 F) in 1949, marked on the chart; the median year is -4.4 C (24.1 F).

Coldest night (TNn) at Walnut Creek 2 ESE by year
Year	Coldest night (TNn)
1893	-1.1 C (30.0 F)
1894	-5.6 C (21.9 F)
1895	-4.4 C (24.1 F)
1896	-2.2 C (28.0 F)
1897	-2.8 C (27.0 F)
1898	-5.6 C (21.9 F)
1899	-5.0 C (23.0 F)
1900	-2.2 C (28.0 F)
1912	n/a
1913	n/a
1914	-2.8 C (27.0 F)
1915	-3.9 C (25.0 F)
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	-3.9 C (25.0 F)
1948	-6.7 C (19.9 F)
1949	-8.3 C (17.1 F)
1950	-7.2 C (19.0 F)
1951	-3.9 C (25.0 F)
1952	-5.0 C (23.0 F)
1953	-3.3 C (26.1 F)
1954	-3.3 C (26.1 F)
1955	-3.9 C (25.0 F)
1956	-4.4 C (24.1 F)
1957	-4.4 C (24.1 F)
1958	-4.4 C (24.1 F)
1959	-4.4 C (24.1 F)
1960	-6.7 C (19.9 F)
1961	-5.0 C (23.0 F)
1962	-6.1 C (21.0 F)
1963	-6.7 C (19.9 F)
1964	-4.4 C (24.1 F)
1965	-6.7 C (19.9 F)
1966	-5.6 C (21.9 F)
1967	-5.0 C (23.0 F)
1968	-6.1 C (21.0 F)
1969	-3.9 C (25.0 F)
1970	-4.4 C (24.1 F)
1971	-5.0 C (23.0 F)
1972	-7.8 C (18.0 F)
1973	-5.0 C (23.0 F)
1974	-3.9 C (25.0 F)

Wettest day (Rx1day)

The wettest day of the year at Walnut Creek 2 ESE, 1893 to 1974. The record is 106.7 mm (4.2 in) in 1962, marked on the chart; the median year is 47.0 mm (1.9 in).

Wettest day (Rx1day) at Walnut Creek 2 ESE by year
Year	Wettest day (Rx1day)
1893	45.2 mm (1.8 in)
1894	61.0 mm (2.4 in)
1895	88.9 mm (3.5 in)
1896	57.2 mm (2.3 in)
1897	54.6 mm (2.1 in)
1898	37.6 mm (1.5 in)
1899	50.0 mm (2.0 in)
1900	72.4 mm (2.9 in)
1912	26.7 mm (1.1 in)
1913	83.8 mm (3.3 in)
1914	71.6 mm (2.8 in)
1915	58.4 mm (2.3 in)
1918	66.0 mm (2.6 in)
1919	91.4 mm (3.6 in)
1920	26.4 mm (1.0 in)
1921	48.8 mm (1.9 in)
1922	49.5 mm (1.9 in)
1923	23.9 mm (0.9 in)
1924	43.2 mm (1.7 in)
1925	49.5 mm (1.9 in)
1926	58.4 mm (2.3 in)
1927	42.7 mm (1.7 in)
1928	48.5 mm (1.9 in)
1929	27.2 mm (1.1 in)
1930	41.1 mm (1.6 in)
1931	57.2 mm (2.3 in)
1932	30.5 mm (1.2 in)
1933	31.8 mm (1.3 in)
1934	31.2 mm (1.2 in)
1935	36.6 mm (1.4 in)
1936	50.8 mm (2.0 in)
1937	68.1 mm (2.7 in)
1938	46.2 mm (1.8 in)
1939	34.8 mm (1.4 in)
1940	81.3 mm (3.2 in)
1941	46.5 mm (1.8 in)
1942	38.6 mm (1.5 in)
1943	83.1 mm (3.3 in)
1944	43.7 mm (1.7 in)
1945	58.9 mm (2.3 in)
1946	19.1 mm (0.8 in)
1947	38.1 mm (1.5 in)
1948	27.9 mm (1.1 in)
1949	26.9 mm (1.1 in)
1950	64.5 mm (2.5 in)
1951	36.1 mm (1.4 in)
1952	71.9 mm (2.8 in)
1953	37.8 mm (1.5 in)
1954	55.9 mm (2.2 in)
1955	83.3 mm (3.3 in)
1956	38.4 mm (1.5 in)
1957	40.1 mm (1.6 in)
1958	66.0 mm (2.6 in)
1959	37.1 mm (1.5 in)
1960	46.2 mm (1.8 in)
1961	38.1 mm (1.5 in)
1962	106.7 mm (4.2 in)
1963	83.1 mm (3.3 in)
1964	72.1 mm (2.8 in)
1965	35.6 mm (1.4 in)
1966	40.1 mm (1.6 in)
1967	34.8 mm (1.4 in)
1968	57.7 mm (2.3 in)
1969	62.7 mm (2.5 in)
1970	47.0 mm (1.9 in)
1971	46.2 mm (1.8 in)
1972	25.9 mm (1.0 in)
1973	47.5 mm (1.9 in)
1974	54.9 mm (2.2 in)

Wettest five days (Rx5day)

The wettest five days of the year at Walnut Creek 2 ESE, 1893 to 1974. The record is 272.8 mm (10.7 in) in 1962, marked on the chart; the median year is 91.7 mm (3.6 in).

Wettest five days (Rx5day) at Walnut Creek 2 ESE by year
Year	Wettest five days (Rx5day)
1893	101.1 mm (4.0 in)
1894	126.5 mm (5.0 in)
1895	113.0 mm (4.4 in)
1896	106.7 mm (4.2 in)
1897	84.6 mm (3.3 in)
1898	57.9 mm (2.3 in)
1899	90.3 mm (3.6 in)
1900	93.2 mm (3.7 in)
1912	63.5 mm (2.5 in)
1913	165.6 mm (6.5 in)
1914	144.3 mm (5.7 in)
1915	86.6 mm (3.4 in)
1918	116.0 mm (4.6 in)
1919	171.5 mm (6.8 in)
1920	54.3 mm (2.1 in)
1921	90.9 mm (3.6 in)
1922	111.1 mm (4.4 in)
1923	46.8 mm (1.8 in)
1924	47.3 mm (1.9 in)
1925	92.6 mm (3.6 in)
1926	122.2 mm (4.8 in)
1927	96.5 mm (3.8 in)
1928	102.2 mm (4.0 in)
1929	61.1 mm (2.4 in)
1930	66.5 mm (2.6 in)
1931	175.9 mm (6.9 in)
1932	72.9 mm (2.9 in)
1933	76.0 mm (3.0 in)
1934	78.2 mm (3.1 in)
1935	44.7 mm (1.8 in)
1936	123.3 mm (4.9 in)
1937	147.1 mm (5.8 in)
1938	141.5 mm (5.6 in)
1939	60.2 mm (2.4 in)
1940	155.2 mm (6.1 in)
1941	90.7 mm (3.6 in)
1942	100.8 mm (4.0 in)
1943	168.2 mm (6.6 in)
1944	73.7 mm (2.9 in)
1945	141.7 mm (5.6 in)
1946	19.1 mm (0.8 in)
1947	64.8 mm (2.6 in)
1948	39.1 mm (1.5 in)
1949	47.4 mm (1.9 in)
1950	138.7 mm (5.5 in)
1951	95.1 mm (3.7 in)
1952	160.3 mm (6.3 in)
1953	41.7 mm (1.6 in)
1954	79.3 mm (3.1 in)
1955	252.7 mm (9.9 in)
1956	71.4 mm (2.8 in)
1957	91.7 mm (3.6 in)
1958	142.9 mm (5.6 in)
1959	75.2 mm (3.0 in)
1960	68.0 mm (2.7 in)
1961	84.3 mm (3.3 in)
1962	272.8 mm (10.7 in)
1963	163.6 mm (6.4 in)
1964	123.0 mm (4.8 in)
1965	84.9 mm (3.3 in)
1966	72.2 mm (2.8 in)
1967	81.7 mm (3.2 in)
1968	80.0 mm (3.1 in)
1969	126.7 mm (5.0 in)
1970	128.9 mm (5.1 in)
1971	72.0 mm (2.8 in)
1972	70.9 mm (2.8 in)
1973	105.1 mm (4.1 in)
1974	97.9 mm (3.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Walnut Creek 2 ESE, 1893 to 1974. The record is 176 days in 1955, marked on the chart; the median year is 107 days.

Longest dry spell (CDD) at Walnut Creek 2 ESE by year
Year	Longest dry spell (CDD)
1893	115 days
1894	50 days
1895	27 days
1896	30 days
1897	60 days
1898	49 days
1899	31 days
1900	52 days
1912	32 days
1913	40 days
1914	46 days
1915	175 days
1918	109 days
1919	168 days
1920	24 days
1921	33 days
1922	26 days
1923	47 days
1924	35 days
1925	68 days
1926	61 days
1927	140 days
1928	121 days
1929	67 days
1930	88 days
1931	128 days
1932	154 days
1933	121 days
1934	88 days
1935	117 days
1936	122 days
1937	108 days
1938	154 days
1939	44 days
1940	97 days
1941	67 days
1942	105 days
1943	140 days
1944	141 days
1945	167 days
1946	107 days
1947	30 days
1948	132 days
1949	72 days
1950	165 days
1951	116 days
1952	136 days
1953	81 days
1954	132 days
1955	176 days
1956	135 days
1957	92 days
1958	126 days
1959	143 days
1960	133 days
1961	70 days
1962	102 days
1963	93 days
1964	140 days
1965	112 days
1966	80 days
1967	106 days
1968	150 days
1969	173 days
1970	132 days
1971	166 days
1972	108 days
1973	159 days
1974	35 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

29 years with a frost

Across 29 years with a frost, the median last spring frost at Walnut Creek 2 ESE falls on 23 March and the median first autumn frost on 17 November, which leaves a median of 231 days between them.

Fitted over all years, the growing season changes by -7.8 days per decade at this station.

Frost dates and growing season at Walnut Creek 2 ESE
Measure	Median, all years	Earliest period	Recent period (1893 to 1973)	Recent against earliest	Fitted trend
Last spring frost	23 March	n/a	23 March	n/a	+2.8 days per decade
First autumn frost	17 November	n/a	17 November	n/a	-5.0 days per decade
Growing days	231 days	n/a	231 days	n/a	-7.8 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

47 years, 1893 to 1973

A day with at least 46.9 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 119.4 mm (4.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Walnut Creek 2 ESE: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	46.9 mm (1.8 in)
5 years	64.1 mm (2.5 in)
10 years	76.3 mm (3.0 in)
25 years	92.8 mm (3.7 in)
50 years	105.8 mm (4.2 in)	Longer than the 47 years of record
100 years	119.4 mm (4.7 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 1893 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: 106.7 mm (4.2 in) in 1962; 91.4 mm (3.6 in) in 1919; 83.3 mm (3.3 in) in 1955.

Download the Data

Data for Walnut Creek 2 ESE standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Walnut Creek 2 ESE 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).