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Helwan (Cairo) Weather Records (EGE00147730)

Record envelope, standing records and threshold days for Helwan (Cairo) (EGE00147730), Egypt, with 54 years of record.

Key Facts for Helwan (Cairo)

  • Helwan (Cairo) (EGE00147730) is a weather station in Egypt at 29.86 latitude and 31.34 longitude, 116 m (381 ft) above sea level.
  • The station reports from 1904 to 1957, 54 years of record.
  • 1,464 records set at Helwan (Cairo) still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • Helwan (Cairo) tied a daily record high minimum temperature of 18.0 C (64.4 F) on 17 December 1957.

About the Station

  • Location: Egypt, 29.86 latitude, 31.34 longitude.
  • Elevation: 116 m (381 ft).
  • Period of record: 1904 to 1957, 54 years.
  • Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Helwan (Cairo), with 2026 drawn through them The band shows the record high and record low for each calendar day at Helwan (Cairo). The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. 01020304050 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Helwan (Cairo). 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 Helwan (Cairo), with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan31.0 C (87.8 F)1.9 C (35.4 F)n/an/a
Feb33.0 C (91.4 F)0.0 C (32.0 F)n/an/a
Mar38.0 C (100.4 F)3.0 C (37.4 F)n/an/a
Apr45.0 C (113.0 F)4.0 C (39.2 F)n/an/a
May47.0 C (116.6 F)9.4 C (48.9 F)n/an/a
Jun47.5 C (117.5 F)13.0 C (55.4 F)n/an/a
Jul45.0 C (113.0 F)16.0 C (60.8 F)n/an/a
Aug43.0 C (109.4 F)17.0 C (62.6 F)n/an/a
Sep42.0 C (107.6 F)15.0 C (59.0 F)n/an/a
Oct42.6 C (108.7 F)10.0 C (50.0 F)n/an/a
Nov38.0 C (100.4 F)5.0 C (41.0 F)n/an/a
Dec32.0 C (89.6 F)1.3 C (34.3 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Helwan (Cairo) by the year they were set 1,464 records at Helwan (Cairo) still stand. 1908 holds the most, with 71. 0204060801904: 321905: 261906: 171907: 441908: 711909: 211910: 471911: 301912: 481913: 371914: 321915: 311916: 361917: 291918: 281919: 331920: 261921: 381922: 181923: 201924: 341925: 361926: 231927: 161928: 241929: 271930: 211931: 311932: 311933: 371934: 221935: 281936: 331937: 151938: 171939: 151940: 241942: 241943: 461944: 161945: 161946: 111947: 231948: 281949: 311950: 211951: 221952: 291953: 361954: 81955: 81956: 311957: 16190419101916192219281934194019471953
1,464 records at Helwan (Cairo) still stand. 1908 holds the most, with 71.
Standing records at Helwan (Cairo) by the year they were set
Year setStanding records
190432
190526
190617
190744
190871
190921
191047
191130
191248
191337
191432
191531
191636
191729
191828
191933
192026
192138
192218
192320
192434
192536
192623
192716
192824
192927
193021
193131
193231
193337
193422
193528
193633
193715
193817
193915
194024
194224
194346
194416
194516
194611
194723
194828
194931
195021
195122
195229
195336
19548
19558
195631
195716

All-Time Record Progression

2 new records
When Helwan (Cairo) set new all-time records 2 all-time records were set at Helwan (Cairo) between 5 February 1950 and 6 February 1950. Each dot is a new record. Record low maximum temperatureRecord low minimum temperature5 February 1950: Record low maximum temperature 7.0 C (44.6 F)6 February 1950: Record low minimum temperature 0.0 C (32.0 F)1950
2 all-time records were set at Helwan (Cairo) between 5 February 1950 and 6 February 1950. Each dot is a new record.
When Helwan (Cairo) set new all-time records
DateKindDetail
1950-02-05Record low maximum temperatureRecord low maximum temperature 7.0 C (44.6 F)
1950-02-06Record low minimum temperatureRecord low minimum temperature 0.0 C (32.0 F)

Wettest Day of Each Month

Apr: 37.0 mm (1.5 in)
Record daily precipitation for each month at Helwan (Cairo) The wettest day on record for each calendar month at Helwan (Cairo). The most was 37.0 mm (1.5 in) on 24 April 1908. 010203040 Jan: 26.0 mm (1.0 in), 17 January 1919 Jan Feb: 21.7 mm (0.9 in), 15 February 1904 Feb Mar: 26.0 mm (1.0 in), 18 March 1916 Mar Apr: 37.0 mm (1.5 in), 24 April 1908 Apr May: 28.0 mm (1.1 in), 13 May 1945 May Jun: 2.0 mm (0.08 in), 4 June 1921 Jun Jul: 0.0 mm (0.00 in), 1 July 1904 Jul Aug: 0.0 mm (0.00 in), 1 August 1904 Aug Sep: 0.0 mm (0.00 in), 1 September 1904 Sep Oct: 22.0 mm (0.9 in), 27 October 1937 Oct Nov: 13.0 mm (0.5 in), 4 November 1927 Nov Dec: 33.0 mm (1.3 in), 6 December 1951 Dec
The wettest day on record for each calendar month at Helwan (Cairo). The most was 37.0 mm (1.5 in) on 24 April 1908.
Record daily precipitation for each month at Helwan (Cairo)
MonthRecord daily precipitation (mm)Date
Jan26.0 mm (1.0 in)17 January 1919
Feb21.7 mm (0.9 in)15 February 1904
Mar26.0 mm (1.0 in)18 March 1916
Apr37.0 mm (1.5 in)24 April 1908
May28.0 mm (1.1 in)13 May 1945
Jun2.0 mm (0.08 in)4 June 1921
Jul0.0 mm (0.00 in)1 July 1904
Aug0.0 mm (0.00 in)1 August 1904
Sep0.0 mm (0.00 in)1 September 1904
Oct22.0 mm (0.9 in)27 October 1937
Nov13.0 mm (0.5 in)4 November 1927
Dec33.0 mm (1.3 in)6 December 1951

Period of Record Coverage

1904 to 1957
Days with data per year at Helwan (Cairo) 53 years of record at Helwan (Cairo), 1904 to 1957. 3 years have data for under 90 percent of days and are left out of rankings: 1949, 1955, 1956. 1904: 366 of 366 days1905: 364 of 365 days1906: 365 of 365 days1907: 349 of 365 days1908: 366 of 366 days1909: 365 of 365 days1910: 359 of 365 days1911: 359 of 365 days1912: 366 of 366 days1913: 355 of 365 days1914: 360 of 365 days1915: 355 of 365 days1916: 366 of 366 days1917: 365 of 365 days1918: 360 of 365 days1919: 358 of 365 days1920: 366 of 366 days1921: 360 of 365 days1922: 355 of 365 days1923: 365 of 365 days1924: 366 of 366 days1925: 360 of 365 days1926: 359 of 365 days1927: 359 of 365 days1928: 358 of 366 days1929: 363 of 365 days1930: 359 of 365 days1931: 365 of 365 days1932: 361 of 366 days1933: 365 of 365 days1934: 355 of 365 days1935: 365 of 365 days1936: 354 of 366 days1937: 365 of 365 days1938: 360 of 365 days1939: 365 of 365 days1940: 366 of 366 days1942: 365 of 365 days1943: 365 of 365 days1944: 365 of 366 days1945: 344 of 365 days1946: 365 of 365 days1947: 355 of 365 days1948: 360 of 366 days1949: 309 of 365 days1950: 361 of 365 days1951: 350 of 365 days1952: 365 of 366 days1953: 360 of 365 days1954: 350 of 365 days1955: 177 of 365 days1956: 291 of 366 days1957: 341 of 365 days19101920193019401950
53 years of record at Helwan (Cairo), 1904 to 1957. 3 years have data for under 90 percent of days and are left out of rankings: 1949, 1955, 1956.
Days with data per year at Helwan (Cairo)
YearDays with dataShare of yearComplete
1904366100%Yes
1905364100%Yes
1906365100%Yes
190734996%Yes
1908366100%Yes
1909365100%Yes
191035998%Yes
191135998%Yes
1912366100%Yes
191335597%Yes
191436099%Yes
191535597%Yes
1916366100%Yes
1917365100%Yes
191836099%Yes
191935898%Yes
1920366100%Yes
192136099%Yes
192235597%Yes
1923365100%Yes
1924366100%Yes
192536099%Yes
192635998%Yes
192735998%Yes
192835898%Yes
192936399%Yes
193035998%Yes
1931365100%Yes
193236199%Yes
1933365100%Yes
193435597%Yes
1935365100%Yes
193635497%Yes
1937365100%Yes
193836099%Yes
1939365100%Yes
1940366100%Yes
1942365100%Yes
1943365100%Yes
1944365100%Yes
194534494%Yes
1946365100%Yes
194735597%Yes
194836098%Yes
194930985%No
195036199%Yes
195135096%Yes
1952365100%Yes
195336099%Yes
195435096%Yes
195517748%No
195629180%No
195734193%Yes

Latest Records

20
Latest records at Helwan (Cairo)
DateStationRecordValueBeat old record byOld record stoodSignificance
17 December 1957Helwan (Cairo), EGdaily high min (Tie)18.0 C (64.4 F)tie24 years3 of 100 (Routine)
16 December 1957Helwan (Cairo), EGdaily high max29.0 C (84.2 F)2.0 C (3.6 F)32 years20 of 100 (Routine)
15 December 1957Helwan (Cairo), EGdaily high max27.0 C (80.6 F)1.0 C (1.8 F)24 years15 of 100 (Routine)
7 December 1957Helwan (Cairo), EGdaily low min5.0 C (41.0 F)1.0 C (1.8 F)28 years16 of 100 (Routine)
6 December 1957Helwan (Cairo), EGdaily low min6.0 C (42.8 F)1.0 C (1.8 F)20 years14 of 100 (Routine)
5 December 1957Helwan (Cairo), EGdaily low min6.0 C (42.8 F)1.0 C (1.8 F)20 years14 of 100 (Routine)
29 November 1957Helwan (Cairo), EGdaily rain7.0 mm (0.28 in)4.1 mm (0.16 in)34 years20 of 100 (Routine)
28 November 1957Helwan (Cairo), EGdaily rain2.0 mm (0.08 in)1.4 mm (0.06 in)52 years20 of 100 (Routine)
5 November 1957Helwan (Cairo), EGdaily high min21.0 C (69.8 F)1.0 C (1.8 F)38 years19 of 100 (Routine)
4 November 1957Helwan (Cairo), EGdaily high max (Tie)33.0 C (91.4 F)tie38 years4 of 100 (Routine)
19 October 1957Helwan (Cairo), EGdaily high min (Tie)21.0 C (69.8 F)tie39 years4 of 100 (Routine)
24 September 1957Helwan (Cairo), EGdaily high min (Tie)23.0 C (73.4 F)tie4 years1 of 100 (Routine)
22 August 1957Helwan (Cairo), EGdaily high max (Tie)39.0 C (102.2 F)tie32 years3 of 100 (Routine)
12 August 1957Helwan (Cairo), EGdaily low min (Tie)20.0 C (68.0 F)tie48 years4 of 100 (Routine)
10 August 1957Helwan (Cairo), EGdaily low min (Tie)20.0 C (68.0 F)tie50 years5 of 100 (Routine)
3 July 1957Helwan (Cairo), EGdaily low max31.0 C (87.8 F)1.0 C (1.8 F)24 years16 of 100 (Routine)
24 June 1957Helwan (Cairo), EGdaily low max (Tie)31.0 C (87.8 F)tie36 years3 of 100 (Routine)
11 June 1957Helwan (Cairo), EGdaily low max (Tie)30.0 C (86.0 F)tie47 years4 of 100 (Routine)
22 April 1957Helwan (Cairo), EGdaily low max (Tie)22.0 C (71.6 F)tie24 years3 of 100 (Routine)
15 April 1957Helwan (Cairo), EGdaily high max40.0 C (104.0 F)1.0 C (1.8 F)44 years19 of 100 (Routine)

Climate Trend

48 complete years, 1904 to 1957
Annual mean temperature at Helwan (Cairo) as warming stripes, 1904 to 1957 One stripe for each of 48 complete years at Helwan (Cairo), 1904 to 1957. Blue stripes are years cooler than the station's own mean of 21.8 C (71.2 F); red stripes are warmer. The coolest year was 1908, at 20.7 C (69.2 F), and the warmest was 1916, at 22.5 C (72.5 F). The strongest colour marks a difference of 1.2 C (2.2 F). 1904: 21.2 C, -0.6 C from the station mean1905: 21.6 C, -0.2 C from the station mean1906: 21.7 C, -0.1 C from the station mean1907: 21.0 C, -0.8 C from the station mean1908: 20.7 C, -1.1 C from the station mean1909: 21.9 C, +0.1 C from the station mean1911: 21.1 C, -0.7 C from the station mean1912: 21.2 C, -0.6 C from the station mean1913: 20.8 C, -1.0 C from the station mean1914: 21.6 C, -0.2 C from the station mean1915: 22.3 C, +0.5 C from the station mean1916: 22.5 C, +0.7 C from the station mean1917: 21.9 C, +0.1 C from the station mean1918: 22.1 C, +0.3 C from the station mean1919: 22.3 C, +0.5 C from the station mean1920: 21.2 C, -0.6 C from the station mean1921: 21.2 C, -0.6 C from the station mean1922: 21.8 C, +0.1 C from the station mean1923: 21.7 C, -0.1 C from the station mean1924: 22.0 C, +0.2 C from the station mean1925: 21.8 C, 0.0 C from the station mean1926: 21.7 C, -0.1 C from the station mean1927: 22.3 C, +0.6 C from the station mean1928: 22.3 C, +0.5 C from the station mean1929: 21.6 C, -0.2 C from the station mean1930: 22.2 C, +0.4 C from the station mean1931: 22.2 C, +0.4 C from the station mean1932: 22.1 C, +0.3 C from the station mean1934: 22.3 C, +0.5 C from the station mean1935: 22.1 C, +0.4 C from the station mean1936: 22.3 C, +0.5 C from the station mean1937: 22.0 C, +0.2 C from the station mean1938: 21.0 C, -0.7 C from the station mean1939: 22.4 C, +0.6 C from the station mean1940: 21.8 C, +0.1 C from the station mean1942: 21.9 C, +0.1 C from the station mean1943: 21.5 C, -0.3 C from the station mean1944: 21.6 C, -0.2 C from the station mean1945: 21.1 C, -0.7 C from the station mean1946: 22.1 C, +0.3 C from the station mean1947: 22.3 C, +0.6 C from the station mean1948: 21.1 C, -0.7 C from the station mean1950: 22.1 C, +0.3 C from the station mean1951: 22.3 C, +0.5 C from the station mean1952: 22.5 C, +0.7 C from the station mean1953: 21.7 C, -0.1 C from the station mean1954: 21.8 C, 0.0 C from the station mean1957: 21.7 C, -0.1 C from the station mean19041910191519201925193019351940194519501955
One stripe for each of 48 complete years at Helwan (Cairo), 1904 to 1957. Blue stripes are years cooler than the station's own mean of 21.8 C (71.2 F); red stripes are warmer. The coolest year was 1908, at 20.7 C (69.2 F), and the warmest was 1916, at 22.5 C (72.5 F). The strongest colour marks a difference of 1.2 C (2.2 F).
Annual mean temperature at Helwan (Cairo) as warming stripes, 1904 to 1957
YearAnnual mean temperatureDifference from the station mean
190421.2 C-0.56 C
190521.6 C-0.17 C
190621.7 C-0.07 C
190721.0 C-0.81 C
190820.7 C-1.10 C
190921.9 C+0.13 C
191121.1 C-0.71 C
191221.2 C-0.57 C
191320.8 C-1.00 C
191421.6 C-0.21 C
191522.3 C+0.51 C
191622.5 C+0.71 C
191721.9 C+0.14 C
191822.1 C+0.33 C
191922.3 C+0.47 C
192021.2 C-0.62 C
192121.2 C-0.59 C
192221.8 C+0.06 C
192321.7 C-0.13 C
192422.0 C+0.20 C
192521.8 C+0.04 C
192621.7 C-0.05 C
192722.3 C+0.56 C
192822.3 C+0.55 C
192921.6 C-0.17 C
193022.2 C+0.44 C
193122.2 C+0.40 C
193222.1 C+0.32 C
193422.3 C+0.48 C
193522.1 C+0.36 C
193622.3 C+0.54 C
193722.0 C+0.25 C
193821.0 C-0.74 C
193922.4 C+0.61 C
194021.8 C+0.06 C
194221.9 C+0.12 C
194321.5 C-0.25 C
194421.6 C-0.21 C
194521.1 C-0.66 C
194622.1 C+0.35 C
194722.3 C+0.56 C
194821.1 C-0.71 C
195022.1 C+0.28 C
195122.3 C+0.47 C
195222.5 C+0.69 C
195321.7 C-0.08 C
195421.8 C0.00 C
195721.7 C-0.07 C

The annual mean temperature here has risen by 0.10 C (0.01 to 0.19) per decade over 1904 to 1957. In Fahrenheit: 0.18 F (0.02 to 0.34) per decade. The slope is a straight line fitted to 48 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Helwan (Cairo)
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.10 C (0.01 to 0.19) per decade0.18 F (0.02 to 0.34) per decade1904 to 195748Rise
Mean daily maximum0.04 C (-0.07 to 0.15) per decade0.1 F (-0.1 to 0.3) per decade1904 to 195748Not clearly different from zero
Mean daily minimum0.2 C (0.1 to 0.2) per decade0.3 F (0.1 to 0.4) per decade1904 to 195748Rise

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

1904 to 1957
Yearly extremes at Helwan (Cairo): the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)47.5 C (117.5 F)193343.0 C (109.4 F)53
Coldest night (TNn)0.0 C (32.0 F)19504.0 C (39.2 F)53
Wettest day (Rx1day)37.0 mm (1.5 in)19089.0 mm (0.35 in)54
Wettest five days (Rx5day)71.0 mm (2.8 in)194510.0 mm (0.4 in)54
Longest dry spell (CDD)332 days1935241 days54

Hottest day (TXx)

Hottest day (TXx) at Helwan (Cairo) by year The hottest day of the year at Helwan (Cairo), 1904 to 1957. The record is 47.5 C (117.5 F) in 1933, marked on the chart; the median year is 43.0 C (109.4 F). 404244464819101920193019401950Record: 47.5 C (117.5 F) in 1933
The hottest day of the year at Helwan (Cairo), 1904 to 1957. The record is 47.5 C (117.5 F) in 1933, marked on the chart; the median year is 43.0 C (109.4 F).
Hottest day (TXx) at Helwan (Cairo) by year
YearHottest day (TXx)
190442.2 C (108.0 F)
190543.8 C (110.8 F)
190643.2 C (109.8 F)
190742.0 C (107.6 F)
190842.0 C (107.6 F)
190944.0 C (111.2 F)
191042.0 C (107.6 F)
191142.0 C (107.6 F)
191240.0 C (104.0 F)
191343.0 C (109.4 F)
191445.0 C (113.0 F)
191546.0 C (114.8 F)
191646.0 C (114.8 F)
191744.0 C (111.2 F)
191842.0 C (107.6 F)
191943.0 C (109.4 F)
192042.0 C (107.6 F)
192143.0 C (109.4 F)
192240.0 C (104.0 F)
192344.0 C (111.2 F)
192443.0 C (109.4 F)
192545.0 C (113.0 F)
192644.0 C (111.2 F)
192746.0 C (114.8 F)
192845.0 C (113.0 F)
192943.0 C (109.4 F)
193044.0 C (111.2 F)
193143.0 C (109.4 F)
193243.0 C (109.4 F)
193347.5 C (117.5 F)
193445.0 C (113.0 F)
193544.0 C (111.2 F)
193643.0 C (109.4 F)
193742.0 C (107.6 F)
193843.0 C (109.4 F)
193947.0 C (116.6 F)
194043.0 C (109.4 F)
1941n/a
194244.9 C (112.8 F)
194342.6 C (108.7 F)
194444.0 C (111.2 F)
194543.0 C (109.4 F)
194643.0 C (109.4 F)
194745.0 C (113.0 F)
194846.0 C (114.8 F)
194944.0 C (111.2 F)
195041.0 C (105.8 F)
195143.0 C (109.4 F)
195243.0 C (109.4 F)
195343.5 C (110.3 F)
195443.0 C (109.4 F)
195541.0 C (105.8 F)
195644.0 C (111.2 F)
195740.0 C (104.0 F)

Coldest night (TNn)

Coldest night (TNn) at Helwan (Cairo) by year The coldest night of the year at Helwan (Cairo), 1904 to 1957. The record is 0.0 C (32.0 F) in 1950, marked on the chart; the median year is 4.0 C (39.2 F). 0246819101920193019401950Record: 0.0 C (32.0 F) in 1950
The coldest night of the year at Helwan (Cairo), 1904 to 1957. The record is 0.0 C (32.0 F) in 1950, marked on the chart; the median year is 4.0 C (39.2 F).
Coldest night (TNn) at Helwan (Cairo) by year
YearColdest night (TNn)
19043.5 C (38.3 F)
19051.3 C (34.3 F)
19062.6 C (36.7 F)
19072.0 C (35.6 F)
19083.0 C (37.4 F)
19094.0 C (39.2 F)
19102.0 C (35.6 F)
19112.0 C (35.6 F)
19124.0 C (39.2 F)
19134.0 C (39.2 F)
19145.0 C (41.0 F)
19154.0 C (39.2 F)
19164.0 C (39.2 F)
19175.0 C (41.0 F)
19184.0 C (39.2 F)
19196.0 C (42.8 F)
19203.0 C (37.4 F)
19213.0 C (37.4 F)
19225.0 C (41.0 F)
19234.6 C (40.3 F)
19243.0 C (37.4 F)
19253.0 C (37.4 F)
19265.0 C (41.0 F)
19273.0 C (37.4 F)
19284.0 C (39.2 F)
19293.0 C (37.4 F)
19304.0 C (39.2 F)
19314.0 C (39.2 F)
19322.0 C (35.6 F)
19334.0 C (39.2 F)
19342.0 C (35.6 F)
19354.0 C (39.2 F)
19363.0 C (37.4 F)
19373.0 C (37.4 F)
19383.0 C (37.4 F)
19396.0 C (42.8 F)
19403.0 C (37.4 F)
1941n/a
19422.6 C (36.7 F)
19433.3 C (37.9 F)
19443.2 C (37.8 F)
19453.0 C (37.4 F)
19464.0 C (39.2 F)
19476.0 C (42.8 F)
19484.0 C (39.2 F)
19494.0 C (39.2 F)
19500.0 C (32.0 F)
19515.0 C (41.0 F)
19524.0 C (39.2 F)
19534.0 C (39.2 F)
19545.0 C (41.0 F)
19557.0 C (44.6 F)
19564.0 C (39.2 F)
19574.0 C (39.2 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Helwan (Cairo) by year The wettest day of the year at Helwan (Cairo), 1904 to 1957. The record is 37.0 mm (1.5 in) in 1908, marked on the chart; the median year is 9.0 mm (0.35 in). 01020304019101920193019401950Record: 37.0 mm (1.5 in) in 1908
The wettest day of the year at Helwan (Cairo), 1904 to 1957. The record is 37.0 mm (1.5 in) in 1908, marked on the chart; the median year is 9.0 mm (0.35 in).
Wettest day (Rx1day) at Helwan (Cairo) by year
YearWettest day (Rx1day)
190421.7 mm (0.9 in)
19051.4 mm (0.06 in)
190610.4 mm (0.4 in)
190724.0 mm (0.9 in)
190837.0 mm (1.5 in)
190929.0 mm (1.1 in)
19106.0 mm (0.24 in)
191112.0 mm (0.5 in)
191213.0 mm (0.5 in)
191313.0 mm (0.5 in)
19145.0 mm (0.20 in)
19157.0 mm (0.28 in)
191626.0 mm (1.0 in)
19179.0 mm (0.35 in)
19189.0 mm (0.35 in)
191926.0 mm (1.0 in)
192012.0 mm (0.5 in)
192121.0 mm (0.8 in)
19225.0 mm (0.20 in)
19237.5 mm (0.30 in)
192411.0 mm (0.4 in)
192511.0 mm (0.4 in)
192612.0 mm (0.5 in)
192713.0 mm (0.5 in)
19282.0 mm (0.08 in)
192914.0 mm (0.6 in)
19306.0 mm (0.24 in)
19316.0 mm (0.24 in)
19323.0 mm (0.12 in)
19334.7 mm (0.19 in)
19344.0 mm (0.16 in)
19351.0 mm (0.04 in)
19366.0 mm (0.24 in)
193722.0 mm (0.9 in)
19388.0 mm (0.31 in)
19397.0 mm (0.28 in)
194010.4 mm (0.4 in)
194111.9 mm (0.5 in)
194211.6 mm (0.5 in)
194316.2 mm (0.6 in)
194427.3 mm (1.1 in)
194528.0 mm (1.1 in)
19468.0 mm (0.31 in)
19479.0 mm (0.35 in)
19483.0 mm (0.12 in)
19495.0 mm (0.20 in)
19505.0 mm (0.20 in)
195133.0 mm (1.3 in)
19528.0 mm (0.31 in)
19532.0 mm (0.08 in)
19548.0 mm (0.31 in)
19554.0 mm (0.16 in)
19566.4 mm (0.25 in)
19577.0 mm (0.28 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Helwan (Cairo) by year The wettest five days of the year at Helwan (Cairo), 1904 to 1957. The record is 71.0 mm (2.8 in) in 1945, marked on the chart; the median year is 10.0 mm (0.4 in). 02040608019101920193019401950Record: 71.0 mm (2.8 in) in 1945
The wettest five days of the year at Helwan (Cairo), 1904 to 1957. The record is 71.0 mm (2.8 in) in 1945, marked on the chart; the median year is 10.0 mm (0.4 in).
Wettest five days (Rx5day) at Helwan (Cairo) by year
YearWettest five days (Rx5day)
190424.7 mm (1.0 in)
19051.8 mm (0.07 in)
190610.4 mm (0.4 in)
190724.0 mm (0.9 in)
190837.0 mm (1.5 in)
190946.0 mm (1.8 in)
19106.0 mm (0.24 in)
191113.0 mm (0.5 in)
191213.0 mm (0.5 in)
191315.0 mm (0.6 in)
19147.0 mm (0.28 in)
19157.0 mm (0.28 in)
191626.0 mm (1.0 in)
191712.0 mm (0.5 in)
191810.0 mm (0.4 in)
191928.0 mm (1.1 in)
192014.0 mm (0.6 in)
192127.0 mm (1.1 in)
19228.0 mm (0.31 in)
192313.2 mm (0.5 in)
192419.0 mm (0.7 in)
192519.0 mm (0.7 in)
192612.0 mm (0.5 in)
192719.0 mm (0.7 in)
19284.0 mm (0.16 in)
192925.0 mm (1.0 in)
193010.0 mm (0.4 in)
193110.0 mm (0.4 in)
19323.0 mm (0.12 in)
19338.3 mm (0.33 in)
19344.0 mm (0.16 in)
19352.0 mm (0.08 in)
19366.0 mm (0.24 in)
193724.0 mm (0.9 in)
19388.0 mm (0.31 in)
193910.0 mm (0.4 in)
194010.4 mm (0.4 in)
19410.0 mm (0.00 in)
194212.2 mm (0.5 in)
194323.5 mm (0.9 in)
194442.4 mm (1.7 in)
194571.0 mm (2.8 in)
19469.0 mm (0.35 in)
19479.0 mm (0.35 in)
19485.0 mm (0.20 in)
19497.0 mm (0.28 in)
19505.0 mm (0.20 in)
195133.0 mm (1.3 in)
19528.0 mm (0.31 in)
19533.1 mm (0.12 in)
19548.1 mm (0.32 in)
19556.0 mm (0.24 in)
19563.0 mm (0.12 in)
195710.0 mm (0.4 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Helwan (Cairo) by year The longest dry spell of the year at Helwan (Cairo), 1904 to 1957. The record is 332 days in 1935, marked on the chart; the median year is 241 days. 010020030040019101920193019401950Record: 332 days in 1935
The longest dry spell of the year at Helwan (Cairo), 1904 to 1957. The record is 332 days in 1935, marked on the chart; the median year is 241 days.
Longest dry spell (CDD) at Helwan (Cairo) by year
YearLongest dry spell (CDD)
1904195 days
1905265 days
1906163 days
1907233 days
1908251 days
1909254 days
1910251 days
1911261 days
1912293 days
1913189 days
1914224 days
1915317 days
1916281 days
1917293 days
1918176 days
1919316 days
1920294 days
1921186 days
1922300 days
1923172 days
1924238 days
1925214 days
1926247 days
1927263 days
1928264 days
1929218 days
1930207 days
1931235 days
1932273 days
1933296 days
1934229 days
1935332 days
1936268 days
1937200 days
1938245 days
1939224 days
1940163 days
1941244 days
1942211 days
1943213 days
1944204 days
1945186 days
1946209 days
1947250 days
1948185 days
1949143 days
1950100 days
195161 days
1952269 days
1953322 days
1954178 days
1955274 days
1956274 days
1957259 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

51 years, 1904 to 1957

A day with at least 9.6 mm (0.38 in) of rain is expected about once in 2 years. A day with at least 47.5 mm (1.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Helwan (Cairo): the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years9.6 mm (0.38 in)
5 years17.2 mm (0.7 in)
10 years23.1 mm (0.9 in)
25 years31.7 mm (1.2 in)
50 years39.1 mm (1.5 in)
100 years47.5 mm (1.9 in)Longer than the 51 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, 51 years of values from 1904 to 1957.

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: 37.0 mm (1.5 in) in 1908; 33.0 mm (1.3 in) in 1951; 29.0 mm (1.1 in) in 1909.

Download the Data

  • Data for Helwan (Cairo) standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Helwan (Cairo) 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 2026-10-12 (12 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2025-12-31).