Shasta Dam Weather Records (USC00048135)

Record envelope, standing records and threshold days for Shasta Dam (USC00048135), California, United States, with 84 years of record.

Key Facts for Shasta Dam

Shasta Dam (USC00048135) is a weather station in California, United States at 40.71 latitude and -122.42 longitude, 328 m (1,075 ft) above sea level.
The station reports from 1943 to 2026, 84 years of record.
1,464 records set at Shasta Dam still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Shasta Dam set a daily record high maximum temperature of 37.2 C (99.0 F) on 9 October 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

Location: California, United States, 40.71 latitude, -122.42 longitude.
Elevation: 328 m (1,075 ft).
Period of record: 1943 to 2026, 84 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

17 days at or beyond a record

The band shows the record high and record low for each calendar day at Shasta Dam. The lines show the 2026 daily maximum and minimum. 17 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Shasta Dam, 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)	-7.2 C (19.0 F)	23.3 C (73.9 F)	-1.1 C (30.0 F)
Feb	26.7 C (80.1 F)	-6.1 C (21.0 F)	24.4 C (75.9 F)	-3.3 C (26.1 F)
Mar	35.0 C (95.0 F)	-3.9 C (25.0 F)	35.0 C (95.0 F)	3.9 C (39.0 F)
Apr	36.1 C (97.0 F)	-2.2 C (28.0 F)	27.8 C (82.0 F)	2.8 C (37.0 F)
May	41.7 C (107.1 F)	1.7 C (35.1 F)	33.9 C (93.0 F)	5.6 C (42.1 F)
Jun	43.9 C (111.0 F)	3.3 C (37.9 F)	39.4 C (102.9 F)	12.8 C (55.0 F)
Jul	46.1 C (115.0 F)	10.0 C (50.0 F)	39.4 C (102.9 F)	17.8 C (64.0 F)
Aug	46.1 C (115.0 F)	6.7 C (44.1 F)	42.2 C (108.0 F)	10.6 C (51.1 F)
Sep	45.6 C (114.1 F)	6.1 C (43.0 F)	33.9 C (93.0 F)	11.1 C (52.0 F)
Oct	40.0 C (104.0 F)	1.1 C (34.0 F)	37.2 C (99.0 F)	11.1 C (52.0 F)
Nov	32.2 C (90.0 F)	-2.8 C (27.0 F)	n/a	n/a
Dec	26.7 C (80.1 F)	-10.0 C (14.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Shasta Dam still stand. 1985 holds the most, with 38.

Standing records at Shasta Dam by the year they were set
Year set	Standing records
1943	27
1944	30
1945	18
1946	9
1947	32
1948	17
1949	18
1950	35
1951	13
1952	32
1953	14
1954	15
1955	28
1956	17
1957	8
1958	9
1959	15
1960	16
1961	15
1962	31
1963	15
1964	18
1965	7
1966	14
1967	30
1968	22
1969	10
1970	8
1971	24
1972	37
1973	15
1974	16
1975	24
1976	21
1977	25
1978	22
1979	6
1980	11
1981	9
1982	27
1983	16
1984	18
1985	38
1986	23
1987	24
1988	34
1989	17
1990	16
1991	24
1992	9
1993	3
1994	8
1995	19
1996	19
1997	13
1998	13
1999	14
2000	15
2001	11
2002	9
2003	20
2004	12
2005	15
2006	15
2007	10
2008	10
2009	13
2010	11
2011	15
2012	16
2013	12
2014	11
2015	21
2016	8
2017	14
2018	13
2019	14
2020	11
2021	26
2022	27
2023	12
2024	16
2025	24
2026	15

All-Time Record Progression

4 new records

4 all-time records were set at Shasta Dam between 28 July 1976 and 22 December 1990. Each dot is a new record.

When Shasta Dam set new all-time records
Date	Kind	Detail
1976-07-28	Record high maximum temperature	Record high maximum temperature 46.1 C (115.0 F)
1978-08-08	Record high minimum temperature	Record high minimum temperature 29.4 C (84.9 F)
1990-12-21	Record low minimum temperature	Record low minimum temperature -10.0 C (14.0 F)
1990-12-22	Record low maximum temperature	Record low maximum temperature -3.3 C (26.1 F)

Wettest Day of Each Month

Dec: 295.7 mm (11.6 in)

The wettest day on record for each calendar month at Shasta Dam. The most was 295.7 mm (11.6 in) on 22 December 1964.

Record daily precipitation for each month at Shasta Dam
Month	Record daily precipitation (mm)	Date
Jan	196.6 mm (7.7 in)	16 January 1973
Feb	182.9 mm (7.2 in)	27 February 2019
Mar	176.5 mm (6.9 in)	24 March 1998
Apr	126.0 mm (5.0 in)	26 April 1959
May	101.1 mm (4.0 in)	17 May 1996
Jun	133.9 mm (5.3 in)	30 June 1992
Jul	66.8 mm (2.6 in)	9 July 1974
Aug	86.4 mm (3.4 in)	15 August 1976
Sep	112.5 mm (4.4 in)	27 September 1957
Oct	110.0 mm (4.3 in)	31 October 1944
Nov	165.9 mm (6.5 in)	28 November 1970
Dec	295.7 mm (11.6 in)	22 December 1964

Period of Record Coverage

1943 to 2026

84 years of record at Shasta Dam, 1943 to 2026. 8 years have data for under 90 percent of days and are left out of rankings: 1943, 1986, 1988, 2005, 2018, 2020, 2025, 2026.

Days with data per year at Shasta Dam
Year	Days with data	Share of year	Complete
1943	305	84%	No
1944	366	100%	Yes
1945	364	100%	Yes
1946	362	99%	Yes
1947	360	99%	Yes
1948	364	99%	Yes
1949	354	97%	Yes
1950	363	99%	Yes
1951	364	100%	Yes
1952	356	97%	Yes
1953	359	98%	Yes
1954	364	100%	Yes
1955	365	100%	Yes
1956	366	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	365	100%	Yes
1960	364	99%	Yes
1961	365	100%	Yes
1962	365	100%	Yes
1963	365	100%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	364	100%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	334	92%	Yes
1974	364	100%	Yes
1975	353	97%	Yes
1976	366	100%	Yes
1977	364	100%	Yes
1978	365	100%	Yes
1979	364	100%	Yes
1980	365	100%	Yes
1981	364	100%	Yes
1982	361	99%	Yes
1983	363	99%	Yes
1984	365	100%	Yes
1985	335	92%	Yes
1986	321	88%	No
1987	364	100%	Yes
1988	317	87%	No
1989	365	100%	Yes
1990	365	100%	Yes
1991	363	99%	Yes
1992	365	100%	Yes
1993	363	99%	Yes
1994	365	100%	Yes
1995	361	99%	Yes
1996	364	99%	Yes
1997	363	99%	Yes
1998	364	100%	Yes
1999	365	100%	Yes
2000	365	100%	Yes
2001	360	99%	Yes
2002	365	100%	Yes
2003	357	98%	Yes
2004	332	91%	Yes
2005	300	82%	No
2006	364	100%	Yes
2007	365	100%	Yes
2008	333	91%	Yes
2009	363	99%	Yes
2010	364	100%	Yes
2011	365	100%	Yes
2012	363	99%	Yes
2013	364	100%	Yes
2014	360	99%	Yes
2015	360	99%	Yes
2016	354	97%	Yes
2017	341	93%	Yes
2018	311	85%	No
2019	335	92%	Yes
2020	329	90%	No
2021	346	95%	Yes
2022	364	100%	Yes
2023	353	97%	Yes
2024	353	96%	Yes
2025	287	79%	No
2026	256	70%	No

Latest Records

Latest records at Shasta Dam
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
9 October 2026	Shasta Dam, US	daily high max (Provisional)	37.2 C (99.0 F)	0.5 C (0.9 F)	4 years	9 of 100 (Routine)
8 October 2026	Shasta Dam, US	daily high max (Provisional)	37.2 C (99.0 F)	0.5 C (0.9 F)	45 years	21 of 100 (Routine)
6 October 2026	Shasta Dam, US	daily high min (Provisional)	21.1 C (70.0 F)	0.5 C (0.9 F)	83 years	33 of 100 (Routine)
4 September 2026	Shasta Dam, US	daily rain (Provisional)	7.4 mm (0.29 in)	3.1 mm (0.12 in)	25 years	16 of 100 (Routine)
30 August 2026	Shasta Dam, US	daily low min (Provisional)	11.7 C (53.1 F)	0.5 C (0.9 F)	72 years	30 of 100 (Routine)
29 August 2026	Shasta Dam, US	daily low min (Provisional)	11.1 C (52.0 F)	1.1 C (2.0 F)	75 years	33 of 100 (Routine)
26 August 2026	Shasta Dam, US	daily low min (Provisional)	10.6 C (51.1 F)	0.5 C (0.9 F)	72 years	30 of 100 (Routine)
4 August 2026	Shasta Dam, US	daily high min	26.1 C (79.0 F)	1.1 C (2.0 F)	28 years	19 of 100 (Routine)
29 March 2026	Shasta Dam, US	daily high max	28.3 C (82.9 F)	0.5 C (0.9 F)	81 years	32 of 100 (Routine)
22 March 2026	Shasta Dam, US	daily high min	14.4 C (57.9 F)	2.2 C (4.0 F)	21 years	21 of 100 (Routine)
22 March 2026	Shasta Dam, US	monthly high max (Tie)	35.0 C (95.0 F)	tie	0 years	4 of 100 (Routine)
21 March 2026	Shasta Dam, US	daily high min	13.3 C (55.9 F)	1.1 C (2.0 F)	48 years	25 of 100 (Routine)
21 March 2026	Shasta Dam, US	monthly high max	35.0 C (95.0 F)	3.3 C (5.9 F)	0 years	24 of 100 (Routine)
20 March 2026	Shasta Dam, US	monthly high max	31.7 C (89.1 F)	0.6 C (1.1 F)	79 years	42 of 100 (Notable)
20 March 2026	Shasta Dam, US	daily high min	14.4 C (57.9 F)	2.2 C (4.0 F)	79 years	38 of 100 (Notable)
17 March 2026	Shasta Dam, US	monthly high max (Tie)	31.1 C (88.0 F)	tie	79 years	10 of 100 (Routine)
17 March 2026	Shasta Dam, US	daily high min (Tie)	13.9 C (57.0 F)	tie	21 years	3 of 100 (Routine)
1 March 2026	Shasta Dam, US	daily high min (Tie)	10.6 C (51.1 F)	tie	68 years	7 of 100 (Routine)
21 February 2026	Shasta Dam, US	daily low min	-1.1 C (30.0 F)	1.1 C (2.0 F)	74 years	33 of 100 (Routine)
20 February 2026	Shasta Dam, US	daily low min	-2.8 C (27.0 F)	2.2 C (4.0 F)	70 years	36 of 100 (Notable)

Climate Trend

71 complete years, 1944 to 2024

One stripe for each of 71 complete years at Shasta Dam, 1944 to 2024. Blue stripes are years cooler than the station's own mean of 16.9 C (62.4 F); red stripes are warmer. The coolest year was 1982, at 15.4 C (59.7 F), and the warmest was 2015, at 18.8 C (65.8 F). The strongest colour marks a difference of 1.9 C (3.4 F).

Annual mean temperature at Shasta Dam as warming stripes, 1944 to 2024
Year	Annual mean temperature	Difference from the station mean
1944	17.7 C	+0.79 C
1945	17.6 C	+0.65 C
1946	16.9 C	-0.07 C
1947	17.2 C	+0.29 C
1948	15.6 C	-1.29 C
1949	16.8 C	-0.13 C
1950	16.9 C	-0.04 C
1951	16.6 C	-0.32 C
1952	16.2 C	-0.70 C
1953	16.1 C	-0.79 C
1954	16.3 C	-0.65 C
1955	16.2 C	-0.69 C
1956	16.8 C	-0.16 C
1957	16.2 C	-0.71 C
1958	17.6 C	+0.68 C
1959	18.0 C	+1.03 C
1960	17.1 C	+0.13 C
1961	16.6 C	-0.30 C
1962	16.8 C	-0.11 C
1963	15.9 C	-1.01 C
1964	16.3 C	-0.62 C
1965	16.3 C	-0.59 C
1966	17.1 C	+0.13 C
1967	16.5 C	-0.38 C
1968	16.4 C	-0.57 C
1969	16.5 C	-0.47 C
1970	16.7 C	-0.27 C
1971	15.6 C	-1.33 C
1972	16.0 C	-0.88 C
1974	16.7 C	-0.26 C
1976	17.0 C	+0.08 C
1977	16.6 C	-0.33 C
1978	16.8 C	-0.16 C
1979	16.7 C	-0.19 C
1980	16.7 C	-0.21 C
1981	17.2 C	+0.32 C
1982	15.4 C	-1.51 C
1983	15.8 C	-1.08 C
1984	16.8 C	-0.11 C
1987	17.5 C	+0.55 C
1989	16.7 C	-0.20 C
1990	16.9 C	-0.06 C
1991	17.3 C	+0.40 C
1992	17.7 C	+0.82 C
1993	16.4 C	-0.49 C
1994	16.9 C	-0.02 C
1995	17.0 C	+0.07 C
1996	17.3 C	+0.39 C
1997	17.2 C	+0.30 C
1998	15.7 C	-1.26 C
1999	16.7 C	-0.25 C
2000	16.9 C	+0.02 C
2001	17.4 C	+0.45 C
2002	17.6 C	+0.65 C
2003	17.4 C	+0.50 C
2006	17.0 C	+0.06 C
2007	17.2 C	+0.26 C
2009	17.0 C	+0.08 C
2010	16.0 C	-0.93 C
2011	16.1 C	-0.80 C
2012	17.1 C	+0.16 C
2013	18.0 C	+1.05 C
2014	18.5 C	+1.57 C
2015	18.8 C	+1.86 C
2016	17.5 C	+0.60 C
2017	17.9 C	+1.02 C
2019	17.4 C	+0.51 C
2021	18.6 C	+1.65 C
2022	18.3 C	+1.36 C
2023	17.1 C	+0.19 C
2024	18.0 C	+1.03 C

The annual mean temperature here has risen by 0.1 C (0.1 to 0.2) per decade over 1944 to 2024. In Fahrenheit: 0.2 F (0.1 to 0.4) per decade. The slope is a straight line fitted to 71 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Shasta Dam
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.1 C (0.1 to 0.2) per decade	0.2 F (0.1 to 0.4) per decade	1944 to 2024	71	Rise
Mean daily maximum	0.2 C (0.1 to 0.3) per decade	0.3 F (0.2 to 0.5) per decade	1944 to 2024	71	Rise
Mean daily minimum	0.09 C (0.04 to 0.14) per decade	0.2 F (0.1 to 0.2) per decade	1944 to 2024	71	Rise

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

1943 to 2026

Yearly extremes at Shasta Dam: 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)	1976	42.2 C (108.0 F)	84
Coldest night (TNn)	-10.0 C (14.0 F)	1990	-1.7 C (28.9 F)	84
Wettest day (Rx1day)	295.7 mm (11.6 in)	1964	112.9 mm (4.4 in)	84
Wettest five days (Rx5day)	629.7 mm (24.8 in)	1955	248.0 mm (9.8 in)	84
Longest dry spell (CDD)	158 days	2002	75 days	84

Hottest day (TXx)

The hottest day of the year at Shasta Dam, 1943 to 2026. The record is 46.1 C (115.0 F) in 1976, marked on the chart; the median year is 42.2 C (108.0 F).

Hottest day (TXx) at Shasta Dam by year
Year	Hottest day (TXx)
1943	43.3 C (109.9 F)
1944	42.8 C (109.0 F)
1945	42.2 C (108.0 F)
1946	43.9 C (111.0 F)
1947	38.9 C (102.0 F)
1948	37.8 C (100.0 F)
1949	41.1 C (106.0 F)
1950	43.3 C (109.9 F)
1951	40.6 C (105.1 F)
1952	39.4 C (102.9 F)
1953	38.9 C (102.0 F)
1954	38.9 C (102.0 F)
1955	45.6 C (114.1 F)
1956	43.9 C (111.0 F)
1957	41.7 C (107.1 F)
1958	41.7 C (107.1 F)
1959	45.0 C (113.0 F)
1960	43.3 C (109.9 F)
1961	42.8 C (109.0 F)
1962	41.1 C (106.0 F)
1963	40.0 C (104.0 F)
1964	41.7 C (107.1 F)
1965	40.6 C (105.1 F)
1966	43.3 C (109.9 F)
1967	41.1 C (106.0 F)
1968	40.6 C (105.1 F)
1969	41.7 C (107.1 F)
1970	41.7 C (107.1 F)
1971	43.3 C (109.9 F)
1972	43.3 C (109.9 F)
1973	43.3 C (109.9 F)
1974	40.0 C (104.0 F)
1975	42.8 C (109.0 F)
1976	46.1 C (115.0 F)
1977	44.4 C (111.9 F)
1978	45.0 C (113.0 F)
1979	41.1 C (106.0 F)
1980	42.2 C (108.0 F)
1981	46.1 C (115.0 F)
1982	40.6 C (105.1 F)
1983	40.6 C (105.1 F)
1984	42.2 C (108.0 F)
1985	42.8 C (109.0 F)
1986	41.7 C (107.1 F)
1987	45.0 C (113.0 F)
1988	45.0 C (113.0 F)
1989	40.6 C (105.1 F)
1990	43.3 C (109.9 F)
1991	42.8 C (109.0 F)
1992	41.7 C (107.1 F)
1993	41.1 C (106.0 F)
1994	40.6 C (105.1 F)
1995	39.4 C (102.9 F)
1996	41.7 C (107.1 F)
1997	42.8 C (109.0 F)
1998	43.3 C (109.9 F)
1999	42.8 C (109.0 F)
2000	41.7 C (107.1 F)
2001	42.2 C (108.0 F)
2002	43.9 C (111.0 F)
2003	43.9 C (111.0 F)
2004	40.6 C (105.1 F)
2005	42.2 C (108.0 F)
2006	43.3 C (109.9 F)
2007	42.8 C (109.0 F)
2008	43.3 C (109.9 F)
2009	42.2 C (108.0 F)
2010	41.7 C (107.1 F)
2011	38.9 C (102.0 F)
2012	43.3 C (109.9 F)
2013	42.8 C (109.0 F)
2014	42.2 C (108.0 F)
2015	43.3 C (109.9 F)
2016	42.8 C (109.0 F)
2017	43.3 C (109.9 F)
2018	42.2 C (108.0 F)
2019	40.6 C (105.1 F)
2020	43.3 C (109.9 F)
2021	45.6 C (114.1 F)
2022	45.6 C (114.1 F)
2023	42.8 C (109.0 F)
2024	45.6 C (114.1 F)
2025	42.2 C (108.0 F)
2026	42.2 C (108.0 F)

Coldest night (TNn)

The coldest night of the year at Shasta Dam, 1943 to 2026. The record is -10.0 C (14.0 F) in 1990, marked on the chart; the median year is -1.7 C (28.9 F).

Coldest night (TNn) at Shasta Dam by year
Year	Coldest night (TNn)
1943	0.0 C (32.0 F)
1944	-0.6 C (30.9 F)
1945	-0.6 C (30.9 F)
1946	-1.7 C (28.9 F)
1947	-2.8 C (27.0 F)
1948	-1.7 C (28.9 F)
1949	-3.9 C (25.0 F)
1950	-3.9 C (25.0 F)
1951	-1.1 C (30.0 F)
1952	-2.2 C (28.0 F)
1953	-1.7 C (28.9 F)
1954	-1.1 C (30.0 F)
1955	-1.1 C (30.0 F)
1956	-2.8 C (27.0 F)
1957	-2.2 C (28.0 F)
1958	0.0 C (32.0 F)
1959	0.0 C (32.0 F)
1960	-1.7 C (28.9 F)
1961	-2.2 C (28.0 F)
1962	-7.2 C (19.0 F)
1963	-1.7 C (28.9 F)
1964	-0.6 C (30.9 F)
1965	-0.6 C (30.9 F)
1966	-1.1 C (30.0 F)
1967	-2.8 C (27.0 F)
1968	-3.3 C (26.1 F)
1969	-2.2 C (28.0 F)
1970	0.0 C (32.0 F)
1971	-1.7 C (28.9 F)
1972	-6.7 C (19.9 F)
1973	-1.1 C (30.0 F)
1974	-1.7 C (28.9 F)
1975	-1.1 C (30.0 F)
1976	-0.6 C (30.9 F)
1977	-2.8 C (27.0 F)
1978	-2.2 C (28.0 F)
1979	-1.7 C (28.9 F)
1980	0.6 C (33.1 F)
1981	0.0 C (32.0 F)
1982	-1.7 C (28.9 F)
1983	-0.6 C (30.9 F)
1984	0.0 C (32.0 F)
1985	-2.2 C (28.0 F)
1986	-1.1 C (30.0 F)
1987	-2.2 C (28.0 F)
1988	-1.7 C (28.9 F)
1989	-6.1 C (21.0 F)
1990	-10.0 C (14.0 F)
1991	-3.3 C (26.1 F)
1992	-2.2 C (28.0 F)
1993	-3.3 C (26.1 F)
1994	-1.1 C (30.0 F)
1995	1.7 C (35.1 F)
1996	-2.8 C (27.0 F)
1997	0.0 C (32.0 F)
1998	-3.9 C (25.0 F)
1999	-2.2 C (28.0 F)
2000	-1.7 C (28.9 F)
2001	-0.6 C (30.9 F)
2002	-1.7 C (28.9 F)
2003	-2.2 C (28.0 F)
2004	0.0 C (32.0 F)
2005	-0.6 C (30.9 F)
2006	-1.1 C (30.0 F)
2007	-0.6 C (30.9 F)
2008	-2.2 C (28.0 F)
2009	-2.8 C (27.0 F)
2010	-1.1 C (30.0 F)
2011	-3.9 C (25.0 F)
2012	-2.2 C (28.0 F)
2013	-4.4 C (24.1 F)
2014	0.6 C (33.1 F)
2015	0.0 C (32.0 F)
2016	-1.1 C (30.0 F)
2017	-1.7 C (28.9 F)
2018	-2.2 C (28.0 F)
2019	-1.1 C (30.0 F)
2020	0.6 C (33.1 F)
2021	-0.6 C (30.9 F)
2022	-0.6 C (30.9 F)
2023	-1.7 C (28.9 F)
2024	-0.6 C (30.9 F)
2025	-3.9 C (25.0 F)
2026	-3.3 C (26.1 F)

Wettest day (Rx1day)

The wettest day of the year at Shasta Dam, 1943 to 2026. The record is 295.7 mm (11.6 in) in 1964, marked on the chart; the median year is 112.9 mm (4.4 in).

Wettest day (Rx1day) at Shasta Dam by year
Year	Wettest day (Rx1day)
1943	101.6 mm (4.0 in)
1944	123.2 mm (4.9 in)
1945	129.5 mm (5.1 in)
1946	99.3 mm (3.9 in)
1947	113.3 mm (4.5 in)
1948	112.0 mm (4.4 in)
1949	62.7 mm (2.5 in)
1950	100.3 mm (3.9 in)
1951	139.7 mm (5.5 in)
1952	100.6 mm (4.0 in)
1953	96.5 mm (3.8 in)
1954	123.2 mm (4.9 in)
1955	209.3 mm (8.2 in)
1956	156.0 mm (6.1 in)
1957	112.5 mm (4.4 in)
1958	110.2 mm (4.3 in)
1959	172.5 mm (6.8 in)
1960	123.7 mm (4.9 in)
1961	112.0 mm (4.4 in)
1962	122.9 mm (4.8 in)
1963	74.9 mm (2.9 in)
1964	295.7 mm (11.6 in)
1965	165.1 mm (6.5 in)
1966	133.9 mm (5.3 in)
1967	84.3 mm (3.3 in)
1968	77.5 mm (3.1 in)
1969	188.5 mm (7.4 in)
1970	165.9 mm (6.5 in)
1971	85.1 mm (3.4 in)
1972	93.5 mm (3.7 in)
1973	196.6 mm (7.7 in)
1974	126.2 mm (5.0 in)
1975	113.5 mm (4.5 in)
1976	88.4 mm (3.5 in)
1977	95.0 mm (3.7 in)
1978	130.6 mm (5.1 in)
1979	170.9 mm (6.7 in)
1980	215.4 mm (8.5 in)
1981	117.9 mm (4.6 in)
1982	103.4 mm (4.1 in)
1983	131.1 mm (5.2 in)
1984	85.9 mm (3.4 in)
1985	106.2 mm (4.2 in)
1986	121.2 mm (4.8 in)
1987	126.5 mm (5.0 in)
1988	127.3 mm (5.0 in)
1989	62.7 mm (2.5 in)
1990	91.2 mm (3.6 in)
1991	111.0 mm (4.4 in)
1992	133.9 mm (5.3 in)
1993	146.8 mm (5.8 in)
1994	63.2 mm (2.5 in)
1995	221.2 mm (8.7 in)
1996	166.6 mm (6.6 in)
1997	125.7 mm (4.9 in)
1998	176.5 mm (6.9 in)
1999	94.2 mm (3.7 in)
2000	108.2 mm (4.3 in)
2001	106.4 mm (4.2 in)
2002	150.9 mm (5.9 in)
2003	96.8 mm (3.8 in)
2004	114.6 mm (4.5 in)
2005	85.1 mm (3.4 in)
2006	106.7 mm (4.2 in)
2007	75.7 mm (3.0 in)
2008	125.7 mm (4.9 in)
2009	77.5 mm (3.1 in)
2010	86.6 mm (3.4 in)
2011	68.1 mm (2.7 in)
2012	127.0 mm (5.0 in)
2013	63.8 mm (2.5 in)
2014	154.7 mm (6.1 in)
2015	168.9 mm (6.6 in)
2016	84.6 mm (3.3 in)
2017	104.6 mm (4.1 in)
2018	102.4 mm (4.0 in)
2019	182.9 mm (7.2 in)
2020	34.8 mm (1.4 in)
2021	82.0 mm (3.2 in)
2022	55.9 mm (2.2 in)
2023	149.9 mm (5.9 in)
2024	143.8 mm (5.7 in)
2025	155.7 mm (6.1 in)
2026	64.5 mm (2.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Shasta Dam, 1943 to 2026. The record is 629.7 mm (24.8 in) in 1955, marked on the chart; the median year is 248.0 mm (9.8 in).

Wettest five days (Rx5day) at Shasta Dam by year
Year	Wettest five days (Rx5day)
1943	164.7 mm (6.5 in)
1944	235.0 mm (9.3 in)
1945	277.6 mm (10.9 in)
1946	202.9 mm (8.0 in)
1947	166.9 mm (6.6 in)
1948	210.8 mm (8.3 in)
1949	180.9 mm (7.1 in)
1950	299.9 mm (11.8 in)
1951	285.0 mm (11.2 in)
1952	198.2 mm (7.8 in)
1953	193.5 mm (7.6 in)
1954	253.2 mm (10.0 in)
1955	629.7 mm (24.8 in)
1956	357.8 mm (14.1 in)
1957	294.7 mm (11.6 in)
1958	246.1 mm (9.7 in)
1959	446.9 mm (17.6 in)
1960	204.0 mm (8.0 in)
1961	229.6 mm (9.0 in)
1962	268.5 mm (10.6 in)
1963	190.6 mm (7.5 in)
1964	614.1 mm (24.2 in)
1965	354.6 mm (14.0 in)
1966	258.7 mm (10.2 in)
1967	176.8 mm (7.0 in)
1968	160.5 mm (6.3 in)
1969	295.9 mm (11.6 in)
1970	343.9 mm (13.5 in)
1971	172.2 mm (6.8 in)
1972	194.1 mm (7.6 in)
1973	278.2 mm (11.0 in)
1974	331.4 mm (13.0 in)
1975	276.1 mm (10.9 in)
1976	162.6 mm (6.4 in)
1977	205.8 mm (8.1 in)
1978	382.2 mm (15.0 in)
1979	288.0 mm (11.3 in)
1980	453.0 mm (17.8 in)
1981	316.2 mm (12.4 in)
1982	234.2 mm (9.2 in)
1983	336.8 mm (13.3 in)
1984	232.8 mm (9.2 in)
1985	161.4 mm (6.4 in)
1986	378.3 mm (14.9 in)
1987	244.1 mm (9.6 in)
1988	144.2 mm (5.7 in)
1989	137.4 mm (5.4 in)
1990	179.1 mm (7.1 in)
1991	269.3 mm (10.6 in)
1992	234.4 mm (9.2 in)
1993	216.2 mm (8.5 in)
1994	162.0 mm (6.4 in)
1995	483.3 mm (19.0 in)
1996	310.5 mm (12.2 in)
1997	455.7 mm (17.9 in)
1998	301.5 mm (11.9 in)
1999	160.0 mm (6.3 in)
2000	423.5 mm (16.7 in)
2001	248.8 mm (9.8 in)
2002	537.3 mm (21.2 in)
2003	281.7 mm (11.1 in)
2004	248.5 mm (9.8 in)
2005	222.7 mm (8.8 in)
2006	234.0 mm (9.2 in)
2007	173.5 mm (6.8 in)
2008	202.3 mm (8.0 in)
2009	246.3 mm (9.7 in)
2010	280.9 mm (11.1 in)
2011	176.3 mm (6.9 in)
2012	347.6 mm (13.7 in)
2013	91.0 mm (3.6 in)
2014	247.4 mm (9.7 in)
2015	265.4 mm (10.4 in)
2016	251.1 mm (9.9 in)
2017	287.7 mm (11.3 in)
2018	144.8 mm (5.7 in)
2019	364.8 mm (14.4 in)
2020	59.5 mm (2.3 in)
2021	241.2 mm (9.5 in)
2022	175.3 mm (6.9 in)
2023	251.5 mm (9.9 in)
2024	304.7 mm (12.0 in)
2025	376.6 mm (14.8 in)
2026	211.3 mm (8.3 in)

Longest dry spell (CDD)

The longest dry spell of the year at Shasta Dam, 1943 to 2026. The record is 158 days in 2002, marked on the chart; the median year is 75 days.

Longest dry spell (CDD) at Shasta Dam by year
Year	Longest dry spell (CDD)
1943	117 days
1944	71 days
1945	64 days
1946	59 days
1947	47 days
1948	43 days
1949	118 days
1950	88 days
1951	142 days
1952	42 days
1953	73 days
1954	62 days
1955	71 days
1956	78 days
1957	108 days
1958	36 days
1959	75 days
1960	102 days
1961	37 days
1962	50 days
1963	81 days
1964	55 days
1965	57 days
1966	82 days
1967	96 days
1968	55 days
1969	91 days
1970	125 days
1971	64 days
1972	66 days
1973	59 days
1974	82 days
1975	58 days
1976	105 days
1977	89 days
1978	63 days
1979	104 days
1980	91 days
1981	79 days
1982	56 days
1983	35 days
1984	79 days
1985	40 days
1986	71 days
1987	95 days
1988	75 days
1989	53 days
1990	62 days
1991	118 days
1992	92 days
1993	120 days
1994	97 days
1995	150 days
1996	77 days
1997	48 days
1998	64 days
1999	124 days
2000	83 days
2001	75 days
2002	158 days
2003	73 days
2004	82 days
2005	42 days
2006	112 days
2007	43 days
2008	103 days
2009	121 days
2010	84 days
2011	60 days
2012	48 days
2013	86 days
2014	61 days
2015	43 days
2016	106 days
2017	38 days
2018	126 days
2019	70 days
2020	124 days
2021	92 days
2022	97 days
2023	45 days
2024	104 days
2025	44 days
2026	73 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

43 years with a frost

Across 43 years with a frost, the median last spring frost at Shasta Dam falls on 19 February and the median first autumn frost on 7 December, which leaves a median of 292 days between them.

Fitted over all years, the growing season changes by +3.6 days per decade at this station.

Frost dates and growing season at Shasta Dam
Measure	Median, all years	Earliest period	Recent period (1966 to 2022)	Recent against earliest	Fitted trend
Last spring frost	19 February	n/a	14 February	n/a	-3.4 days per decade
First autumn frost	7 December	n/a	7 December	n/a	+0.2 days per decade
Growing days	292 days	n/a	294 days	n/a	+3.6 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

82 years, 1943 to 2025

A day with at least 114.8 mm (4.5 in) of rain is expected about once in 2 years. A day with at least 253.3 mm (10.0 in) of rain is expected about once in 100 years.

Rainfall return levels at Shasta Dam: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	114.8 mm (4.5 in)
5 years	152.6 mm (6.0 in)
10 years	177.3 mm (7.0 in)
25 years	208.3 mm (8.2 in)
50 years	230.9 mm (9.1 in)
100 years	253.3 mm (10.0 in)	Longer than the 82 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, 82 years of values from 1943 to 2025.

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: 295.7 mm (11.6 in) in 1964; 221.2 mm (8.7 in) in 1995; 215.4 mm (8.5 in) in 1980.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Climate Twins

2007 to 2024 against 1961 to 1990

Over 2007 to 2024, Shasta Dam had a mean temperature of 17.6 C (63.6 F) and 1,497.4 mm (59.0 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Wilmington Intl AP (United States, 3,949 km away), Livingston (United States, 3,162 km away) and Cedar Is (United States, 4,050 km away).

Climate twins of Shasta Dam: stations whose 1961 to 1990 climate is closest to its 2007 to 2024 climate
Twin station	Country	Distance away	Mean temperature, 1961-1990	Rain a year, 1961-1990	Climate difference
Wilmington Intl AP	United States	3,949 km (2,454 mi)	17.5 C (63.4 F)	1,378.9 mm (54.3 in)	1.40
Livingston	United States	3,162 km (1,965 mi)	17.4 C (63.3 F)	1,520.2 mm (59.9 in)	1.46
Cedar Is	United States	4,050 km (2,517 mi)	17.0 C (62.6 F)	1,464.3 mm (57.6 in)	1.47

Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.

Download the Data

Data for Shasta Dam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Shasta Dam 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-15. Last revised 15 October 2026 (2026-10-15).