Siwa Weather Records (EG000062417)

Record envelope, standing records and threshold days for Siwa (EG000062417), Egypt, with 115 years of record.

Key Facts for Siwa

Siwa (EG000062417) is a weather station in Egypt at 29.20 latitude and 25.32 longitude, -15 m (-49 ft) above sea level.
The station reports from 1911 to 2025, 115 years of record.
1,464 records set at Siwa still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Siwa set a daily record high minimum temperature of 25.4 C (77.7 F) on 28 August 2019.

About the Station

Location: Egypt, 29.20 latitude, 25.32 longitude.
Elevation: -15 m (-49 ft).
Period of record: 1911 to 2025, 115 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 Siwa. 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 Siwa, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	31.6 C (88.9 F)	-5.0 C (23.0 F)	n/a	n/a
Feb	38.8 C (101.8 F)	-5.0 C (23.0 F)	n/a	n/a
Mar	41.1 C (106.0 F)	0.0 C (32.0 F)	n/a	n/a
Apr	45.0 C (113.0 F)	1.0 C (33.8 F)	28.8 C (83.8 F)	18.0 C (64.4 F)
May	48.0 C (118.4 F)	8.9 C (48.0 F)	n/a	17.0 C (62.6 F)
Jun	49.0 C (120.2 F)	13.0 C (55.4 F)	n/a	15.6 C (60.1 F)
Jul	48.0 C (118.4 F)	12.0 C (53.6 F)	n/a	n/a
Aug	46.0 C (114.8 F)	15.0 C (59.0 F)	n/a	n/a
Sep	44.3 C (111.7 F)	11.0 C (51.8 F)	n/a	n/a
Oct	41.6 C (106.9 F)	6.0 C (42.8 F)	n/a	n/a
Nov	38.0 C (100.4 F)	0.3 C (32.5 F)	n/a	n/a
Dec	33.9 C (93.0 F)	-2.0 C (28.4 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Siwa still stand. 1912 holds the most, with 51.

Standing records at Siwa by the year they were set
Year set	Standing records
1912	51
1913	30
1914	30
1915	33
1919	6
1920	15
1921	17
1922	18
1924	38
1925	24
1926	23
1927	9
1928	30
1929	20
1930	20
1931	1
1932	42
1933	31
1934	11
1935	24
1936	29
1937	16
1938	12
1939	24
1940	12
1945	23
1946	8
1947	10
1948	22
1949	19
1950	8
1951	10
1952	9
1953	9
1954	8
1955	2
1956	19
1957	20
1958	15
1960	18
1961	28
1962	11
1963	22
1964	15
1965	18
1966	16
1979	2
1980	1
1982	14
1983	18
1984	11
1985	16
1986	8
1987	11
1988	9
1989	6
1990	9
1991	16
1992	5
1993	4
1994	20
1995	29
1996	34
1997	16
1998	32
1999	6
2000	8
2001	7
2002	21
2003	19
2004	15
2005	20
2006	10
2007	9
2008	17
2009	8
2010	31
2011	14
2012	15
2013	19
2014	9
2015	26
2016	30
2017	16
2018	15
2019	12

All-Time Record Progression

3 new records

3 all-time records were set at Siwa between 19 May 1988 and 7 June 2017. Each dot is a new record.

When Siwa set new all-time records
Date	Kind	Detail
1988-05-19	Record high minimum temperature	Record high minimum temperature 29.6 C (85.3 F)
1995-06-11	Record high minimum temperature	Record high minimum temperature 29.8 C (85.6 F)
2017-06-07	Record high minimum temperature	Record high minimum temperature 30.1 C (86.2 F)

Wettest Day of Each Month

Dec: 28.0 mm (1.1 in)

The wettest day on record for each calendar month at Siwa. The most was 28.0 mm (1.1 in) on 28 December 1930.

Record daily precipitation for each month at Siwa
Month	Record daily precipitation (mm)	Date
Jan	13.0 mm (0.5 in)	7 January 1993
Feb	21.0 mm (0.8 in)	3 February 1948
Mar	10.9 mm (0.4 in)	22 March 1991
Apr	7.0 mm (0.28 in)	16 April 1934
May	23.0 mm (0.9 in)	11 May 1945
Jun	3.3 mm (0.13 in)	11 June 2002
Jul	4.6 mm (0.18 in)	11 July 2002
Aug	0.0 mm (0.00 in)	1 August 1920
Sep	2.0 mm (0.08 in)	12 September 2008
Oct	18.0 mm (0.7 in)	28 October 2002
Nov	4.0 mm (0.16 in)	25 November 1929
Dec	28.0 mm (1.1 in)	28 December 1930

Period of Record Coverage

1911 to 2025

90 years of record at Siwa, 1911 to 2025. 45 years have data for under 90 percent of days and are left out of rankings: 1911, 1915, 1919, 1920, 1924, 1926, 1928, 1930 and others.

Days with data per year at Siwa
Year	Days with data	Share of year	Complete
1911	1	0%	No
1912	339	93%	Yes
1913	357	98%	Yes
1914	330	90%	Yes
1915	292	80%	No
1919	20	5%	No
1920	285	78%	No
1921	334	92%	Yes
1922	338	93%	Yes
1924	298	81%	No
1925	339	93%	Yes
1926	296	81%	No
1927	333	91%	Yes
1928	305	83%	No
1929	338	93%	Yes
1930	269	74%	No
1931	150	41%	No
1932	350	96%	Yes
1933	111	30%	No
1934	358	98%	Yes
1935	348	95%	Yes
1936	364	99%	Yes
1937	350	96%	Yes
1938	163	45%	No
1939	318	87%	No
1940	173	47%	No
1945	355	97%	Yes
1946	356	98%	Yes
1947	354	97%	Yes
1948	353	96%	Yes
1949	277	76%	No
1950	291	80%	No
1951	269	74%	No
1952	320	87%	No
1953	128	35%	No
1954	237	65%	No
1955	169	46%	No
1956	300	82%	No
1957	363	99%	Yes
1958	362	99%	Yes
1959	12	3%	No
1960	347	95%	Yes
1961	352	96%	Yes
1962	348	95%	Yes
1963	355	97%	Yes
1964	361	99%	Yes
1965	360	99%	Yes
1966	273	75%	No
1979	73	20%	No
1980	21	6%	No
1981	29	8%	No
1982	199	55%	No
1983	194	53%	No
1984	175	48%	No
1985	189	52%	No
1986	197	54%	No
1987	228	62%	No
1988	146	40%	No
1989	226	62%	No
1990	311	85%	No
1991	282	77%	No
1992	287	78%	No
1993	84	23%	No
1994	365	100%	Yes
1995	364	100%	Yes
1996	365	100%	Yes
1997	364	100%	Yes
1998	364	100%	Yes
1999	237	65%	No
2000	335	92%	Yes
2001	353	97%	Yes
2002	325	89%	No
2003	341	93%	Yes
2004	344	94%	Yes
2005	349	96%	Yes
2006	348	95%	Yes
2007	350	96%	Yes
2008	356	97%	Yes
2009	354	97%	Yes
2010	356	98%	Yes
2011	343	94%	Yes
2012	352	96%	Yes
2013	319	87%	No
2014	336	92%	Yes
2015	326	89%	No
2016	331	90%	Yes
2017	337	92%	Yes
2018	301	82%	No
2019	207	57%	No
2025	1	0%	No

Latest Records

Latest records at Siwa
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
28 August 2019	Siwa, EG	daily high min	25.4 C (77.7 F)	0.2 C (0.4 F)	24 years	17 of 100 (Routine)
27 August 2019	Siwa, EG	daily high min	26.8 C (80.2 F)	0.8 C (1.4 F)	0 years	13 of 100 (Routine)
26 August 2019	Siwa, EG	daily high min	27.0 C (80.6 F)	1.0 C (1.8 F)	10 years	17 of 100 (Routine)
17 August 2019	Siwa, EG	daily high min	26.4 C (79.5 F)	0.2 C (0.4 F)	4 years	11 of 100 (Routine)
17 July 2019	Siwa, EG	daily high min	28.2 C (82.8 F)	0.7 C (1.3 F)	1 year	13 of 100 (Routine)
16 July 2019	Siwa, EG	daily high min	26.4 C (79.5 F)	0.4 C (0.7 F)	72 years	32 of 100 (Routine)
19 June 2019	Siwa, EG	daily high min	26.0 C (78.8 F)	0.9 C (1.6 F)	6 years	15 of 100 (Routine)
22 May 2019	Siwa, EG	daily high max	45.4 C (113.7 F)	0.4 C (0.7 F)	84 years	35 of 100 (Notable)
28 April 2019	Siwa, EG	daily high min	24.4 C (75.9 F)	1.8 C (3.2 F)	12 years	18 of 100 (Routine)
15 April 2019	Siwa, EG	daily low max	20.0 C (68.0 F)	2.0 C (3.6 F)	104 years	44 of 100 (Notable)
18 January 2019	Siwa, EG	daily low min	-1.4 C (29.5 F)	1.4 C (2.5 F)	84 years	39 of 100 (Notable)
17 January 2019	Siwa, EG	daily low min	-0.4 C (31.3 F)	0.4 C (0.7 F)	95 years	39 of 100 (Notable)
5 December 2018	Siwa, EG	daily high min	15.2 C (59.4 F)	1.5 C (2.7 F)	3 years	14 of 100 (Routine)
20 October 2018	Siwa, EG	daily high min (Tie)	22.0 C (71.6 F)	tie	8 years	3 of 100 (Routine)
27 August 2018	Siwa, EG	daily high min	26.0 C (78.8 F)	0.8 C (1.4 F)	9 years	15 of 100 (Routine)
25 August 2018	Siwa, EG	daily high min	26.9 C (80.4 F)	0.7 C (1.3 F)	16 years	18 of 100 (Routine)
13 August 2018	Siwa, EG	daily high min (Tie)	26.5 C (79.7 F)	tie	3 years	2 of 100 (Routine)
25 July 2018	Siwa, EG	daily high min	26.9 C (80.4 F)	0.6 C (1.1 F)	31 years	21 of 100 (Routine)
2 July 2018	Siwa, EG	daily high min	25.5 C (77.9 F)	0.2 C (0.4 F)	0 years	10 of 100 (Routine)
21 June 2018	Siwa, EG	daily high min (Tie)	26.6 C (79.9 F)	tie	29 years	4 of 100 (Routine)

Climate Trend

39 complete years, 1912 to 2017

One stripe for each of 39 complete years at Siwa, 1912 to 2017. Blue stripes are years cooler than the station's own mean of 22.2 C (71.9 F); red stripes are warmer. The coolest year was 1912, at 20.9 C (69.6 F), and the warmest was 2010, at 23.9 C (75.0 F). The strongest colour marks a difference of 1.8 C (3.2 F).

Annual mean temperature at Siwa as warming stripes, 1912 to 2017
Year	Annual mean temperature	Difference from the station mean
1912	20.9 C	-1.26 C
1913	21.2 C	-0.98 C
1914	21.8 C	-0.32 C
1922	21.2 C	-0.99 C
1925	21.6 C	-0.55 C
1927	21.9 C	-0.30 C
1929	21.4 C	-0.79 C
1934	22.1 C	-0.09 C
1936	21.6 C	-0.55 C
1937	21.6 C	-0.55 C
1945	21.3 C	-0.90 C
1946	21.6 C	-0.58 C
1947	22.0 C	-0.18 C
1952	21.9 C	-0.25 C
1957	21.8 C	-0.37 C
1958	21.9 C	-0.26 C
1961	21.1 C	-1.01 C
1962	22.1 C	-0.08 C
1963	21.9 C	-0.21 C
1964	21.4 C	-0.80 C
1965	21.3 C	-0.88 C
1994	22.6 C	+0.44 C
1995	22.5 C	+0.37 C
1996	22.6 C	+0.46 C
1997	22.3 C	+0.16 C
1998	22.8 C	+0.64 C
2001	22.8 C	+0.67 C
2002	22.9 C	+0.72 C
2004	22.8 C	+0.63 C
2005	22.8 C	+0.60 C
2006	22.6 C	+0.46 C
2007	22.9 C	+0.70 C
2008	23.2 C	+1.09 C
2009	23.0 C	+0.82 C
2010	23.9 C	+1.73 C
2011	22.4 C	+0.22 C
2012	22.7 C	+0.59 C
2016	23.5 C	+1.33 C
2017	22.5 C	+0.31 C

The annual mean temperature here has risen by 0.2 C (0.1 to 0.2) per decade over 1912 to 2017. In Fahrenheit: 0.3 F (0.3 to 0.4) per decade. The slope is a straight line fitted to 39 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Siwa
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.2 C (0.1 to 0.2) per decade	0.3 F (0.3 to 0.4) per decade	1912 to 2017	39	Rise
Mean daily maximum	0.03 C (-0.03 to 0.08) per decade	0.05 F (-0.05 to 0.15) per decade	1912 to 2017	39	Not clearly different from zero
Mean daily minimum	0.3 C (0.3 to 0.4) per decade	0.6 F (0.5 to 0.7) per decade	1912 to 2017	39	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

1911 to 2025

Yearly extremes at Siwa: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	49.0 C (120.2 F)	1940	44.8 C (112.6 F)	90
Coldest night (TNn)	-5.0 C (23.0 F)	1945	0.6 C (33.1 F)	91
Wettest day (Rx1day)	28.0 mm (1.1 in)	1930	1.0 mm (0.04 in)	79
Wettest five days (Rx5day)	39.0 mm (1.5 in)	1945	2.0 mm (0.08 in)	58
Longest dry spell (CDD)	365 days	1932	76 days	79

Hottest day (TXx)

The hottest day of the year at Siwa, 1911 to 2025. The record is 49.0 C (120.2 F) in 1940, marked on the chart; the median year is 44.8 C (112.6 F).

Hottest day (TXx) at Siwa by year
Year	Hottest day (TXx)
1911	19.0 C (66.2 F)
1912	47.0 C (116.6 F)
1913	44.0 C (111.2 F)
1914	47.0 C (116.6 F)
1915	47.0 C (116.6 F)
1919	39.0 C (102.2 F)
1920	43.0 C (109.4 F)
1921	44.0 C (111.2 F)
1922	44.0 C (111.2 F)
1923	n/a
1924	44.0 C (111.2 F)
1925	47.0 C (116.6 F)
1926	47.0 C (116.6 F)
1927	44.0 C (111.2 F)
1928	47.0 C (116.6 F)
1929	44.0 C (111.2 F)
1930	47.0 C (116.6 F)
1931	42.0 C (107.6 F)
1932	45.0 C (113.0 F)
1933	46.0 C (114.8 F)
1934	46.0 C (114.8 F)
1935	44.0 C (111.2 F)
1936	45.0 C (113.0 F)
1937	45.0 C (113.0 F)
1938	45.0 C (113.0 F)
1939	46.0 C (114.8 F)
1940	49.0 C (120.2 F)
1944	n/a
1945	45.0 C (113.0 F)
1946	45.0 C (113.0 F)
1947	44.0 C (111.2 F)
1948	44.0 C (111.2 F)
1949	45.0 C (113.0 F)
1950	43.0 C (109.4 F)
1951	43.0 C (109.4 F)
1952	43.0 C (109.4 F)
1953	40.0 C (104.0 F)
1954	45.0 C (113.0 F)
1955	45.0 C (113.0 F)
1956	45.0 C (113.0 F)
1957	48.0 C (118.4 F)
1958	43.9 C (111.0 F)
1959	41.1 C (106.0 F)
1960	46.1 C (115.0 F)
1961	47.8 C (118.0 F)
1962	46.1 C (115.0 F)
1963	43.9 C (111.0 F)
1964	43.9 C (111.0 F)
1965	47.2 C (117.0 F)
1966	42.8 C (109.0 F)
1979	42.0 C (107.6 F)
1980	41.0 C (105.8 F)
1981	41.0 C (105.8 F)
1982	42.8 C (109.0 F)
1983	43.0 C (109.4 F)
1984	44.8 C (112.6 F)
1985	43.9 C (111.0 F)
1986	45.2 C (113.4 F)
1987	45.0 C (113.0 F)
1988	45.2 C (113.4 F)
1989	44.8 C (112.6 F)
1990	43.7 C (110.7 F)
1991	44.0 C (111.2 F)
1992	45.7 C (114.3 F)
1993	40.2 C (104.4 F)
1994	42.8 C (109.0 F)
1995	48.0 C (118.4 F)
1996	46.2 C (115.2 F)
1997	47.2 C (117.0 F)
1998	45.6 C (114.1 F)
1999	44.0 C (111.2 F)
2000	44.0 C (111.2 F)
2001	43.5 C (110.3 F)
2002	46.8 C (116.2 F)
2003	43.3 C (109.9 F)
2004	44.6 C (112.3 F)
2005	44.0 C (111.2 F)
2006	44.6 C (112.3 F)
2007	45.7 C (114.3 F)
2008	44.8 C (112.6 F)
2009	44.2 C (111.6 F)
2010	48.2 C (118.8 F)
2011	45.6 C (114.1 F)
2012	42.7 C (108.9 F)
2013	44.8 C (112.6 F)
2014	46.0 C (114.8 F)
2015	42.8 C (109.0 F)
2016	47.4 C (117.3 F)
2017	45.4 C (113.7 F)
2018	45.2 C (113.4 F)
2019	45.4 C (113.7 F)
2020	n/a
2021	n/a
2025	28.8 C (83.8 F)

Coldest night (TNn)

The coldest night of the year at Siwa, 1911 to 2025. The record is -5.0 C (23.0 F) in 1945, marked on the chart; the median year is 0.6 C (33.1 F).

Coldest night (TNn) at Siwa by year
Year	Coldest night (TNn)
1911	n/a
1912	0.0 C (32.0 F)
1913	0.0 C (32.0 F)
1914	0.0 C (32.0 F)
1915	-2.0 C (28.4 F)
1919	4.0 C (39.2 F)
1920	2.0 C (35.6 F)
1921	1.0 C (33.8 F)
1922	-2.0 C (28.4 F)
1923	n/a
1924	-2.0 C (28.4 F)
1925	0.0 C (32.0 F)
1926	0.0 C (32.0 F)
1927	0.0 C (32.0 F)
1928	-1.0 C (30.2 F)
1929	0.0 C (32.0 F)
1930	1.0 C (33.8 F)
1931	0.0 C (32.0 F)
1932	-3.0 C (26.6 F)
1933	-2.0 C (28.4 F)
1934	-2.0 C (28.4 F)
1935	-2.0 C (28.4 F)
1936	0.0 C (32.0 F)
1937	-1.0 C (30.2 F)
1938	3.0 C (37.4 F)
1939	-1.0 C (30.2 F)
1940	-2.0 C (28.4 F)
1944	n/a
1945	-5.0 C (23.0 F)
1946	-1.0 C (30.2 F)
1947	-2.0 C (28.4 F)
1948	0.0 C (32.0 F)
1949	0.0 C (32.0 F)
1950	-2.0 C (28.4 F)
1951	1.0 C (33.8 F)
1952	1.0 C (33.8 F)
1953	-2.0 C (28.4 F)
1954	-1.0 C (30.2 F)
1955	2.0 C (35.6 F)
1956	0.0 C (32.0 F)
1957	1.0 C (33.8 F)
1958	0.0 C (32.0 F)
1959	2.2 C (36.0 F)
1960	0.0 C (32.0 F)
1961	1.1 C (34.0 F)
1962	1.1 C (34.0 F)
1963	-1.1 C (30.0 F)
1964	0.0 C (32.0 F)
1965	1.1 C (34.0 F)
1966	-1.1 C (30.0 F)
1979	2.0 C (35.6 F)
1980	3.0 C (37.4 F)
1981	7.0 C (44.6 F)
1982	-0.6 C (30.9 F)
1983	0.0 C (32.0 F)
1984	0.7 C (33.3 F)
1985	0.2 C (32.4 F)
1986	4.2 C (39.6 F)
1987	-0.6 C (30.9 F)
1988	0.6 C (33.1 F)
1989	-3.6 C (25.5 F)
1990	-1.9 C (28.6 F)
1991	0.6 C (33.1 F)
1992	1.2 C (34.2 F)
1993	3.2 C (37.8 F)
1994	3.1 C (37.6 F)
1995	2.0 C (35.6 F)
1996	2.5 C (36.5 F)
1997	3.8 C (38.8 F)
1998	2.6 C (36.7 F)
1999	2.2 C (36.0 F)
2000	2.8 C (37.0 F)
2001	1.2 C (34.2 F)
2002	0.9 C (33.6 F)
2003	1.6 C (34.9 F)
2004	2.2 C (36.0 F)
2005	1.8 C (35.2 F)
2006	0.9 C (33.6 F)
2007	1.5 C (34.7 F)
2008	0.0 C (32.0 F)
2009	2.0 C (35.6 F)
2010	2.2 C (36.0 F)
2011	2.4 C (36.3 F)
2012	-5.0 C (23.0 F)
2013	1.1 C (34.0 F)
2014	3.2 C (37.8 F)
2015	-1.3 C (29.7 F)
2016	2.3 C (36.1 F)
2017	0.3 C (32.5 F)
2018	3.3 C (37.9 F)
2019	-1.4 C (29.5 F)
2020	3.0 C (37.4 F)
2021	12.0 C (53.6 F)
2025	15.6 C (60.1 F)

Wettest day (Rx1day)

The wettest day of the year at Siwa, 1911 to 2025. The record is 28.0 mm (1.1 in) in 1930, marked on the chart; the median year is 1.0 mm (0.04 in).

Wettest day (Rx1day) at Siwa by year
Year	Wettest day (Rx1day)
1911	0.0 mm (0.00 in)
1912	0.0 mm (0.00 in)
1913	n/a
1914	n/a
1915	n/a
1919	n/a
1920	10.0 mm (0.4 in)
1921	4.0 mm (0.16 in)
1922	2.0 mm (0.08 in)
1923	0.0 mm (0.00 in)
1924	0.0 mm (0.00 in)
1925	3.0 mm (0.12 in)
1926	0.0 mm (0.00 in)
1927	18.0 mm (0.7 in)
1928	4.0 mm (0.16 in)
1929	6.0 mm (0.24 in)
1930	28.0 mm (1.1 in)
1931	3.0 mm (0.12 in)
1932	0.0 mm (0.00 in)
1933	0.0 mm (0.00 in)
1934	7.0 mm (0.28 in)
1935	1.0 mm (0.04 in)
1936	10.0 mm (0.4 in)
1937	3.0 mm (0.12 in)
1938	0.0 mm (0.00 in)
1939	5.0 mm (0.20 in)
1940	0.0 mm (0.00 in)
1944	0.0 mm (0.00 in)
1945	23.0 mm (0.9 in)
1946	3.0 mm (0.12 in)
1947	2.0 mm (0.08 in)
1948	21.0 mm (0.8 in)
1949	1.0 mm (0.04 in)
1950	1.0 mm (0.04 in)
1951	0.0 mm (0.00 in)
1952	2.0 mm (0.08 in)
1953	1.0 mm (0.04 in)
1954	2.0 mm (0.08 in)
1955	0.0 mm (0.00 in)
1956	7.0 mm (0.28 in)
1957	7.0 mm (0.28 in)
1958	7.9 mm (0.31 in)
1959	0.0 mm (0.00 in)
1960	4.1 mm (0.16 in)
1961	4.1 mm (0.16 in)
1962	0.5 mm (0.02 in)
1963	7.9 mm (0.31 in)
1964	0.0 mm (0.00 in)
1965	1.0 mm (0.04 in)
1966	0.3 mm (0.01 in)
1979	0.0 mm (0.00 in)
1980	0.0 mm (0.00 in)
1981	0.0 mm (0.00 in)
1982	6.1 mm (0.24 in)
1983	4.1 mm (0.16 in)
1984	0.0 mm (0.00 in)
1985	3.0 mm (0.12 in)
1986	n/a
1987	1.0 mm (0.04 in)
1988	2.0 mm (0.08 in)
1989	1.0 mm (0.04 in)
1990	4.1 mm (0.16 in)
1991	10.9 mm (0.4 in)
1992	2.0 mm (0.08 in)
1993	13.0 mm (0.5 in)
1994	9.0 mm (0.35 in)
1995	1.0 mm (0.04 in)
1996	0.0 mm (0.00 in)
1997	1.0 mm (0.04 in)
1998	0.0 mm (0.00 in)
1999	0.0 mm (0.00 in)
2000	0.8 mm (0.03 in)
2001	n/a
2002	18.0 mm (0.7 in)
2003	0.0 mm (0.00 in)
2004	0.0 mm (0.00 in)
2005	3.0 mm (0.12 in)
2006	n/a
2007	n/a
2008	2.0 mm (0.08 in)
2009	1.0 mm (0.04 in)
2010	n/a
2011	11.9 mm (0.5 in)
2012	1.0 mm (0.04 in)
2013	n/a
2014	n/a
2015	2.0 mm (0.08 in)
2016	1.0 mm (0.04 in)
2017	0.0 mm (0.00 in)
2018	n/a
2019	n/a
2020	0.3 mm (0.01 in)
2021	n/a
2025	n/a

Wettest five days (Rx5day)

The wettest five days of the year at Siwa, 1911 to 2025. The record is 39.0 mm (1.5 in) in 1945, marked on the chart; the median year is 2.0 mm (0.08 in).

Wettest five days (Rx5day) at Siwa by year
Year	Wettest five days (Rx5day)
1911	n/a
1912	0.0 mm (0.00 in)
1913	n/a
1914	n/a
1915	n/a
1919	n/a
1920	16.0 mm (0.6 in)
1921	4.0 mm (0.16 in)
1922	2.0 mm (0.08 in)
1923	n/a
1924	0.0 mm (0.00 in)
1925	3.0 mm (0.12 in)
1926	0.0 mm (0.00 in)
1927	18.0 mm (0.7 in)
1928	4.0 mm (0.16 in)
1929	7.0 mm (0.28 in)
1930	28.0 mm (1.1 in)
1931	3.0 mm (0.12 in)
1932	0.0 mm (0.00 in)
1933	0.0 mm (0.00 in)
1934	7.0 mm (0.28 in)
1935	1.0 mm (0.04 in)
1936	19.0 mm (0.7 in)
1937	3.0 mm (0.12 in)
1938	0.0 mm (0.00 in)
1939	5.0 mm (0.20 in)
1940	0.0 mm (0.00 in)
1944	n/a
1945	39.0 mm (1.5 in)
1946	4.0 mm (0.16 in)
1947	2.0 mm (0.08 in)
1948	21.0 mm (0.8 in)
1949	1.0 mm (0.04 in)
1950	1.0 mm (0.04 in)
1951	0.0 mm (0.00 in)
1952	2.0 mm (0.08 in)
1953	0.0 mm (0.00 in)
1954	3.0 mm (0.12 in)
1955	0.0 mm (0.00 in)
1956	13.0 mm (0.5 in)
1957	7.5 mm (0.30 in)
1958	7.9 mm (0.31 in)
1959	n/a
1960	6.4 mm (0.25 in)
1961	7.1 mm (0.28 in)
1962	0.5 mm (0.02 in)
1963	0.5 mm (0.02 in)
1964	0.0 mm (0.00 in)
1965	1.3 mm (0.05 in)
1966	0.3 mm (0.01 in)
1979	0.0 mm (0.00 in)
1980	n/a
1981	n/a
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	5.1 mm (0.20 in)
1991	11.9 mm (0.5 in)
1992	2.0 mm (0.08 in)
1993	16.0 mm (0.6 in)
1994	9.0 mm (0.35 in)
1995	1.0 mm (0.04 in)
1996	0.0 mm (0.00 in)
1997	1.0 mm (0.04 in)
1998	0.0 mm (0.00 in)
1999	0.0 mm (0.00 in)
2000	0.0 mm (0.00 in)
2001	n/a
2002	18.0 mm (0.7 in)
2003	0.0 mm (0.00 in)
2004	0.0 mm (0.00 in)
2005	4.0 mm (0.16 in)
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a
2011	n/a
2012	n/a
2013	n/a
2014	n/a
2015	n/a
2016	n/a
2017	n/a
2018	n/a
2019	n/a
2020	n/a
2021	n/a
2025	n/a

Longest dry spell (CDD)

The longest dry spell of the year at Siwa, 1911 to 2025. The record is 365 days in 1932, marked on the chart; the median year is 76 days.

Longest dry spell (CDD) at Siwa by year
Year	Longest dry spell (CDD)
1911	1 day
1912	64 days
1913	n/a
1914	n/a
1915	n/a
1919	n/a
1920	97 days
1921	138 days
1922	68 days
1923	1 day
1924	107 days
1925	29 days
1926	45 days
1927	76 days
1928	43 days
1929	109 days
1930	202 days
1931	138 days
1932	365 days
1933	182 days
1934	137 days
1935	237 days
1936	303 days
1937	225 days
1938	116 days
1939	51 days
1940	64 days
1944	1 day
1945	92 days
1946	232 days
1947	76 days
1948	145 days
1949	83 days
1950	76 days
1951	36 days
1952	98 days
1953	54 days
1954	21 days
1955	103 days
1956	203 days
1957	93 days
1958	190 days
1959	1 day
1960	127 days
1961	105 days
1962	122 days
1963	191 days
1964	207 days
1965	178 days
1966	34 days
1979	6 days
1980	2 days
1981	4 days
1982	2 days
1983	2 days
1984	2 days
1985	2 days
1986	n/a
1987	1 day
1988	1 day
1989	1 day
1990	79 days
1991	85 days
1992	61 days
1993	13 days
1994	293 days
1995	331 days
1996	365 days
1997	305 days
1998	364 days
1999	28 days
2000	11 days
2001	n/a
2002	59 days
2003	175 days
2004	87 days
2005	92 days
2006	n/a
2007	n/a
2008	1 day
2009	1 day
2010	n/a
2011	1 day
2012	1 day
2013	n/a
2014	n/a
2015	1 day
2016	1 day
2017	1 day
2018	n/a
2019	n/a
2020	1 day
2021	n/a
2025	n/a

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

35 years, 1920 to 2004

A day with at least 3.2 mm (0.13 in) of rain is expected about once in 2 years. A day with at least 39.2 mm (1.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Siwa: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	3.2 mm (0.13 in)
5 years	8.1 mm (0.32 in)
10 years	12.7 mm (0.5 in)
25 years	20.7 mm (0.8 in)
50 years	28.8 mm (1.1 in)	Longer than the 35 years of record
100 years	39.2 mm (1.5 in)	Longer than the 35 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, 35 years of values from 1920 to 2004.

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: 28.0 mm (1.1 in) in 1930; 23.0 mm (0.9 in) in 1945; 21.0 mm (0.8 in) in 1948.

Download the Data

Data for Siwa standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Siwa 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 2026-10-17 (17 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).