Port Chicago Naval Dep Weather Records (USC00047070)

Record envelope, standing records and threshold days for Port Chicago Naval Dep (USC00047070), California, United States, with 30 years of record.

Key Facts for Port Chicago Naval Dep

Port Chicago Naval Dep (USC00047070) is a weather station in California, United States at 38.02 latitude and -122.02 longitude, 15 m (49 ft) above sea level.
The station reports from 1946 to 1975, 30 years of record.
1,464 records set at Port Chicago Naval Dep still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.

About the Station

Location: California, United States, 38.02 latitude, -122.02 longitude.
Elevation: 15 m (49 ft).
Period of record: 1946 to 1975, 30 years.
Eligible elements: tmax, tmin, prcp, snow.

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 Port Chicago Naval Dep. 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 Port Chicago Naval Dep, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	25.0 C (77.0 F)	-8.3 C (17.1 F)	n/a	n/a
Feb	25.0 C (77.0 F)	-6.1 C (21.0 F)	n/a	n/a
Mar	28.9 C (84.0 F)	-3.9 C (25.0 F)	n/a	n/a
Apr	32.8 C (91.0 F)	-1.1 C (30.0 F)	n/a	n/a
May	38.9 C (102.0 F)	0.0 C (32.0 F)	n/a	n/a
Jun	43.3 C (109.9 F)	4.4 C (39.9 F)	n/a	n/a
Jul	45.6 C (114.1 F)	6.1 C (43.0 F)	n/a	n/a
Aug	41.7 C (107.1 F)	4.4 C (39.9 F)	n/a	n/a
Sep	43.9 C (111.0 F)	1.7 C (35.1 F)	n/a	n/a
Oct	38.3 C (100.9 F)	-2.2 C (28.0 F)	n/a	n/a
Nov	29.4 C (84.9 F)	-5.0 C (23.0 F)	n/a	n/a
Dec	25.0 C (77.0 F)	-8.9 C (16.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Port Chicago Naval Dep still stand. 1949 holds the most, with 83.

Standing records at Port Chicago Naval Dep by the year they were set
Year set	Standing records
1946	43
1947	40
1948	60
1949	83
1950	77
1951	55
1952	63
1953	63
1954	46
1955	55
1956	45
1957	48
1958	30
1959	54
1960	54
1961	59
1962	51
1963	47
1964	45
1965	39
1966	49
1967	47
1968	44
1969	22
1970	42
1971	35
1972	61
1973	45
1974	35
1975	27

Wettest Day of Each Month

Oct: 81.5 mm (3.2 in)

The wettest day on record for each calendar month at Port Chicago Naval Dep. The most was 81.5 mm (3.2 in) on 14 October 1962.

Record daily precipitation for each month at Port Chicago Naval Dep
Month	Record daily precipitation (mm)	Date
Jan	54.6 mm (2.1 in)	21 January 1964
Feb	61.0 mm (2.4 in)	1 February 1963
Mar	30.7 mm (1.2 in)	28 March 1963
Apr	46.2 mm (1.8 in)	3 April 1958
May	21.3 mm (0.8 in)	24 May 1973
Jun	17.0 mm (0.7 in)	9 June 1964
Jul	8.1 mm (0.32 in)	8 July 1974
Aug	4.3 mm (0.17 in)	12 August 1965
Sep	14.0 mm (0.6 in)	19 September 1959
Oct	81.5 mm (3.2 in)	14 October 1962
Nov	46.2 mm (1.8 in)	29 November 1970
Dec	52.3 mm (2.1 in)	20 December 1969

Period of Record Coverage

1946 to 1975

30 years of record at Port Chicago Naval Dep, 1946 to 1975. 2 years have data for under 90 percent of days and are left out of rankings: 1946, 1975.

Days with data per year at Port Chicago Naval Dep
Year	Days with data	Share of year	Complete
1946	246	67%	No
1947	365	100%	Yes
1948	355	97%	Yes
1949	365	100%	Yes
1950	365	100%	Yes
1951	363	99%	Yes
1952	359	98%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	362	99%	Yes
1956	366	100%	Yes
1957	363	99%	Yes
1958	365	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	364	100%	Yes
1967	364	100%	Yes
1968	365	100%	Yes
1969	365	100%	Yes
1970	364	100%	Yes
1971	363	99%	Yes
1972	363	99%	Yes
1973	364	100%	Yes
1974	364	100%	Yes
1975	272	75%	No

Latest Records

No records were set at this station in the latest data.

Climate Trend

27 complete years, 1947 to 1974

One stripe for each of 27 complete years at Port Chicago Naval Dep, 1947 to 1974. Blue stripes are years cooler than the station's own mean of 14.4 C (57.9 F); red stripes are warmer. The coolest year was 1962, at 13.6 C (56.4 F), and the warmest was 1973, at 15.4 C (59.7 F). The strongest colour marks a difference of 1.1 C (2.0 F).

Annual mean temperature at Port Chicago Naval Dep as warming stripes, 1947 to 1974
Year	Annual mean temperature	Difference from the station mean
1947	14.5 C	+0.11 C
1948	13.6 C	-0.76 C
1950	14.4 C	+0.04 C
1951	13.8 C	-0.58 C
1952	13.8 C	-0.65 C
1953	14.2 C	-0.24 C
1954	13.9 C	-0.47 C
1955	13.7 C	-0.68 C
1956	13.7 C	-0.67 C
1957	14.4 C	-0.02 C
1958	14.9 C	+0.54 C
1959	14.8 C	+0.38 C
1960	13.7 C	-0.68 C
1961	14.7 C	+0.32 C
1962	13.6 C	-0.85 C
1963	13.9 C	-0.49 C
1964	14.4 C	-0.02 C
1965	13.9 C	-0.54 C
1966	14.9 C	+0.52 C
1967	14.8 C	+0.36 C
1968	15.0 C	+0.55 C
1969	15.0 C	+0.62 C
1970	15.1 C	+0.74 C
1971	14.3 C	-0.10 C
1972	15.1 C	+0.65 C
1973	15.4 C	+1.01 C
1974	15.4 C	+0.95 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

1946 to 1975

Yearly extremes at Port Chicago Naval Dep: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	45.6 C (114.1 F)	1972	40.6 C (105.1 F)	30
Coldest night (TNn)	-8.9 C (16.0 F)	1972	-5.6 C (21.9 F)	30
Wettest day (Rx1day)	81.5 mm (3.2 in)	1962	32.1 mm (1.3 in)	30
Wettest five days (Rx5day)	204.5 mm (8.1 in)	1962	61.6 mm (2.4 in)	30
Longest dry spell (CDD)	192 days	1968	118 days	30

Hottest day (TXx)

The hottest day of the year at Port Chicago Naval Dep, 1946 to 1975. The record is 45.6 C (114.1 F) in 1972, marked on the chart; the median year is 40.6 C (105.1 F).

Hottest day (TXx) at Port Chicago Naval Dep by year
Year	Hottest day (TXx)
1946	41.7 C (107.1 F)
1947	38.3 C (100.9 F)
1948	38.9 C (102.0 F)
1949	40.0 C (104.0 F)
1950	43.9 C (111.0 F)
1951	39.4 C (102.9 F)
1952	41.1 C (106.0 F)
1953	41.1 C (106.0 F)
1954	40.6 C (105.1 F)
1955	42.8 C (109.0 F)
1956	39.4 C (102.9 F)
1957	40.6 C (105.1 F)
1958	38.3 C (100.9 F)
1959	41.7 C (107.1 F)
1960	41.1 C (106.0 F)
1961	43.3 C (109.9 F)
1962	40.0 C (104.0 F)
1963	37.8 C (100.0 F)
1964	40.0 C (104.0 F)
1965	35.6 C (96.1 F)
1966	40.6 C (105.1 F)
1967	38.3 C (100.9 F)
1968	37.8 C (100.0 F)
1969	38.3 C (100.9 F)
1970	41.1 C (106.0 F)
1971	42.8 C (109.0 F)
1972	45.6 C (114.1 F)
1973	41.1 C (106.0 F)
1974	39.4 C (102.9 F)
1975	41.7 C (107.1 F)

Coldest night (TNn)

The coldest night of the year at Port Chicago Naval Dep, 1946 to 1975. The record is -8.9 C (16.0 F) in 1972, marked on the chart; the median year is -5.6 C (21.9 F).

Coldest night (TNn) at Port Chicago Naval Dep by year
Year	Coldest night (TNn)
1946	-3.3 C (26.1 F)
1947	-6.7 C (19.9 F)
1948	-6.1 C (21.0 F)
1949	-5.6 C (21.9 F)
1950	-8.3 C (17.1 F)
1951	-6.1 C (21.0 F)
1952	-5.6 C (21.9 F)
1953	-3.9 C (25.0 F)
1954	-3.9 C (25.0 F)
1955	-3.9 C (25.0 F)
1956	-5.6 C (21.9 F)
1957	-5.0 C (23.0 F)
1958	-2.2 C (28.0 F)
1959	-5.6 C (21.9 F)
1960	-8.3 C (17.1 F)
1961	-7.8 C (18.0 F)
1962	-6.1 C (21.0 F)
1963	-6.1 C (21.0 F)
1964	-2.2 C (28.0 F)
1965	-5.6 C (21.9 F)
1966	-5.0 C (23.0 F)
1967	-5.0 C (23.0 F)
1968	-6.7 C (19.9 F)
1969	-4.4 C (24.1 F)
1970	-5.0 C (23.0 F)
1971	-5.0 C (23.0 F)
1972	-8.9 C (16.0 F)
1973	-6.7 C (19.9 F)
1974	-3.9 C (25.0 F)
1975	-6.1 C (21.0 F)

Wettest day (Rx1day)

The wettest day of the year at Port Chicago Naval Dep, 1946 to 1975. The record is 81.5 mm (3.2 in) in 1962, marked on the chart; the median year is 32.1 mm (1.3 in).

Wettest day (Rx1day) at Port Chicago Naval Dep by year
Year	Wettest day (Rx1day)
1946	21.6 mm (0.9 in)
1947	20.8 mm (0.8 in)
1948	17.0 mm (0.7 in)
1949	18.8 mm (0.7 in)
1950	32.5 mm (1.3 in)
1951	30.0 mm (1.2 in)
1952	49.5 mm (1.9 in)
1953	25.9 mm (1.0 in)
1954	28.4 mm (1.1 in)
1955	38.6 mm (1.5 in)
1956	26.2 mm (1.0 in)
1957	28.4 mm (1.1 in)
1958	46.2 mm (1.8 in)
1959	31.8 mm (1.3 in)
1960	40.4 mm (1.6 in)
1961	36.6 mm (1.4 in)
1962	81.5 mm (3.2 in)
1963	61.0 mm (2.4 in)
1964	54.6 mm (2.1 in)
1965	27.9 mm (1.1 in)
1966	32.3 mm (1.3 in)
1967	50.8 mm (2.0 in)
1968	51.6 mm (2.0 in)
1969	52.3 mm (2.1 in)
1970	46.2 mm (1.8 in)
1971	24.6 mm (1.0 in)
1972	31.2 mm (1.2 in)
1973	50.8 mm (2.0 in)
1974	29.5 mm (1.2 in)
1975	29.0 mm (1.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Port Chicago Naval Dep, 1946 to 1975. The record is 204.5 mm (8.1 in) in 1962, marked on the chart; the median year is 61.6 mm (2.4 in).

Wettest five days (Rx5day) at Port Chicago Naval Dep by year
Year	Wettest five days (Rx5day)
1946	54.2 mm (2.1 in)
1947	39.1 mm (1.5 in)
1948	32.1 mm (1.3 in)
1949	28.5 mm (1.1 in)
1950	77.7 mm (3.1 in)
1951	53.8 mm (2.1 in)
1952	107.9 mm (4.2 in)
1953	34.8 mm (1.4 in)
1954	52.6 mm (2.1 in)
1955	124.0 mm (4.9 in)
1956	49.6 mm (2.0 in)
1957	61.4 mm (2.4 in)
1958	102.3 mm (4.0 in)
1959	60.2 mm (2.4 in)
1960	50.1 mm (2.0 in)
1961	73.7 mm (2.9 in)
1962	204.5 mm (8.1 in)
1963	110.1 mm (4.3 in)
1964	83.1 mm (3.3 in)
1965	52.3 mm (2.1 in)
1966	50.8 mm (2.0 in)
1967	104.9 mm (4.1 in)
1968	61.8 mm (2.4 in)
1969	93.0 mm (3.7 in)
1970	113.5 mm (4.5 in)
1971	52.7 mm (2.1 in)
1972	75.8 mm (3.0 in)
1973	101.6 mm (4.0 in)
1974	52.1 mm (2.1 in)
1975	66.1 mm (2.6 in)

Longest dry spell (CDD)

The longest dry spell of the year at Port Chicago Naval Dep, 1946 to 1975. The record is 192 days in 1968, marked on the chart; the median year is 118 days.

Longest dry spell (CDD) at Port Chicago Naval Dep by year
Year	Longest dry spell (CDD)
1946	129 days
1947	121 days
1948	95 days
1949	72 days
1950	137 days
1951	117 days
1952	73 days
1953	83 days
1954	183 days
1955	105 days
1956	132 days
1957	129 days
1958	101 days
1959	144 days
1960	133 days
1961	76 days
1962	165 days
1963	93 days
1964	140 days
1965	112 days
1966	80 days
1967	104 days
1968	192 days
1969	168 days
1970	132 days
1971	144 days
1972	108 days
1973	118 days
1974	111 days
1975	81 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

27 years with a frost

Across 27 years with a frost, the median last spring frost at Port Chicago Naval Dep falls on 1 April and the median first autumn frost on 17 November, which leaves a median of 227 days between them.

Fitted over all years, the growing season changes by +10.2 days per decade at this station.

Frost dates and growing season at Port Chicago Naval Dep
Measure	Median, all years	Earliest period	Recent period (1947 to 1974)	Recent against earliest	Fitted trend
Last spring frost	1 April	n/a	1 April	n/a	-6.5 days per decade
First autumn frost	17 November	n/a	17 November	n/a	+3.7 days per decade
Growing days	227 days	n/a	227 days	n/a	+10.2 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.

Download the Data

Data for Port Chicago Naval Dep standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Port Chicago Naval Dep 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).