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Iwami Airport Weather Records (JA000047754)

Record envelope, standing records and threshold days for Iwami Airport (JA000047754), Japan, with 39 years of record.

Key Facts for Iwami Airport

  • Iwami Airport (JA000047754) is a weather station in Japan at 34.68 latitude and 131.78 longitude, 57 m (187 ft) above sea level.
  • The station reports from 1951 to 1989, 39 years of record.
  • 1,464 records set at Iwami Airport still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • Iwami Airport set a daily record high maximum temperature of 19.7 C (67.5 F) on 4 December 1989.

About the Station

  • Location: Japan, 34.68 latitude, 131.78 longitude.
  • Elevation: 57 m (187 ft).
  • Period of record: 1951 to 1989, 39 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 Iwami Airport, with 2026 drawn through them The band shows the record high and record low for each calendar day at Iwami Airport. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -10010203040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Iwami Airport. 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 Iwami Airport, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan18.3 C (64.9 F)-5.8 C (21.6 F)n/an/a
Feb22.2 C (72.0 F)-6.8 C (19.8 F)n/an/a
Mar25.7 C (78.3 F)-3.9 C (25.0 F)n/an/a
Apr29.5 C (85.1 F)-0.3 C (31.5 F)n/an/a
May30.5 C (86.9 F)3.0 C (37.4 F)n/an/a
Jun33.3 C (91.9 F)8.6 C (47.5 F)n/an/a
Jul36.2 C (97.2 F)12.2 C (54.0 F)n/an/a
Aug37.7 C (99.9 F)15.2 C (59.4 F)n/an/a
Sep35.8 C (96.4 F)8.1 C (46.6 F)n/an/a
Oct29.9 C (85.8 F)3.9 C (39.0 F)n/an/a
Nov26.0 C (78.8 F)0.7 C (33.3 F)n/an/a
Dec21.5 C (70.7 F)-3.8 C (25.2 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Iwami Airport by the year they were set 1,464 records at Iwami Airport still stand. 1961 holds the most, with 77. 0204060801955: 461956: 561957: 371958: 381959: 461960: 561961: 771962: 321963: 551964: 551965: 481966: 541967: 411968: 431969: 521970: 351971: 351972: 431973: 411974: 401975: 151976: 381977: 571978: 361979: 351980: 511981: 431982: 331983: 231984: 371985: 361986: 241987: 381988: 291989: 39195519591963196719711975197919831987
1,464 records at Iwami Airport still stand. 1961 holds the most, with 77.
Standing records at Iwami Airport by the year they were set
Year setStanding records
195546
195656
195737
195838
195946
196056
196177
196232
196355
196455
196548
196654
196741
196843
196952
197035
197135
197243
197341
197440
197515
197638
197757
197836
197935
198051
198143
198233
198323
198437
198536
198624
198738
198829
198939

All-Time Record Progression

1 new records
When Iwami Airport set new all-time records 1 all-time records were set at Iwami Airport between 23 June 1985 and 23 June 1985. Each dot is a new record. Record daily precipitation23 June 1985: Record daily precipitation 250.5 mm (9.9 in)1985
1 all-time records were set at Iwami Airport between 23 June 1985 and 23 June 1985. Each dot is a new record.
When Iwami Airport set new all-time records
DateKindDetail
1985-06-23Record daily precipitationRecord daily precipitation 250.5 mm (9.9 in)

Wettest Day of Each Month

Jun: 250.5 mm (9.9 in)
Record daily precipitation for each month at Iwami Airport The wettest day on record for each calendar month at Iwami Airport. The most was 250.5 mm (9.9 in) on 23 June 1985. 0100200300 Jan: 48.5 mm (1.9 in), 22 January 1975 Jan Feb: 45.5 mm (1.8 in), 15 February 1968 Feb Mar: 49.3 mm (1.9 in), 2 March 1966 Mar Apr: 85.0 mm (3.3 in), 15 April 1955 Apr May: 118.5 mm (4.7 in), 19 May 1986 May Jun: 250.5 mm (9.9 in), 23 June 1985 Jun Jul: 199.0 mm (7.8 in), 11 July 1972 Jul Aug: 215.0 mm (8.5 in), 20 August 1972 Aug Sep: 193.1 mm (7.6 in), 25 September 1954 Sep Oct: 158.9 mm (6.3 in), 14 October 1951 Oct Nov: 90.5 mm (3.6 in), 21 November 1980 Nov Dec: 43.5 mm (1.7 in), 6 December 1987 Dec
The wettest day on record for each calendar month at Iwami Airport. The most was 250.5 mm (9.9 in) on 23 June 1985.
Record daily precipitation for each month at Iwami Airport
MonthRecord daily precipitation (mm)Date
Jan48.5 mm (1.9 in)22 January 1975
Feb45.5 mm (1.8 in)15 February 1968
Mar49.3 mm (1.9 in)2 March 1966
Apr85.0 mm (3.3 in)15 April 1955
May118.5 mm (4.7 in)19 May 1986
Jun250.5 mm (9.9 in)23 June 1985
Jul199.0 mm (7.8 in)11 July 1972
Aug215.0 mm (8.5 in)20 August 1972
Sep193.1 mm (7.6 in)25 September 1954
Oct158.9 mm (6.3 in)14 October 1951
Nov90.5 mm (3.6 in)21 November 1980
Dec43.5 mm (1.7 in)6 December 1987

Period of Record Coverage

1955 to 1989
Days with data per year at Iwami Airport 35 years of record at Iwami Airport, 1955 to 1989. Every year has data for at least 90 percent of its days. 1955: 364 of 365 days1956: 363 of 366 days1957: 360 of 365 days1958: 360 of 365 days1959: 358 of 365 days1960: 360 of 366 days1961: 357 of 365 days1962: 361 of 365 days1963: 360 of 365 days1964: 366 of 366 days1965: 365 of 365 days1966: 365 of 365 days1967: 365 of 365 days1968: 366 of 366 days1969: 365 of 365 days1970: 365 of 365 days1971: 365 of 365 days1972: 366 of 366 days1973: 365 of 365 days1974: 365 of 365 days1975: 365 of 365 days1976: 366 of 366 days1977: 365 of 365 days1978: 365 of 365 days1979: 365 of 365 days1980: 366 of 366 days1981: 365 of 365 days1982: 365 of 365 days1983: 365 of 365 days1984: 366 of 366 days1985: 365 of 365 days1986: 365 of 365 days1987: 365 of 365 days1988: 366 of 366 days1989: 365 of 365 days1955196019651970197519801985
35 years of record at Iwami Airport, 1955 to 1989. Every year has data for at least 90 percent of its days.
Days with data per year at Iwami Airport
YearDays with dataShare of yearComplete
1955364100%Yes
195636399%Yes
195736099%Yes
195836099%Yes
195935898%Yes
196036098%Yes
196135798%Yes
196236199%Yes
196336099%Yes
1964366100%Yes
1965365100%Yes
1966365100%Yes
1967365100%Yes
1968366100%Yes
1969365100%Yes
1970365100%Yes
1971365100%Yes
1972366100%Yes
1973365100%Yes
1974365100%Yes
1975365100%Yes
1976366100%Yes
1977365100%Yes
1978365100%Yes
1979365100%Yes
1980366100%Yes
1981365100%Yes
1982365100%Yes
1983365100%Yes
1984366100%Yes
1985365100%Yes
1986365100%Yes
1987365100%Yes
1988366100%Yes
1989365100%Yes

Latest Records

20
Latest records at Iwami Airport
DateStationRecordValueBeat old record byOld record stoodSignificance
4 December 1989Iwami Airport, JPdaily high max19.7 C (67.5 F)1.7 C (3.1 F)16 years12 of 100 (Routine)
29 November 1989Iwami Airport, JPdaily low max8.5 C (47.3 F)0.1 C (0.2 F)27 years11 of 100 (Routine)
13 November 1989Iwami Airport, JPdaily high min14.5 C (58.1 F)0.1 C (0.2 F)23 years9 of 100 (Routine)
8 November 1989Iwami Airport, JPdaily high max23.0 C (73.4 F)1.1 C (2.0 F)27 years14 of 100 (Routine)
7 November 1989Iwami Airport, JPdaily high min17.2 C (63.0 F)1.4 C (2.5 F)14 years11 of 100 (Routine)
6 November 1989Iwami Airport, JPdaily high max23.7 C (74.7 F)0.3 C (0.5 F)12 years6 of 100 (Routine)
6 November 1989Iwami Airport, JPmonthly high min (Tie)19.2 C (66.6 F)tie30 years5 of 100 (Routine)
5 November 1989Iwami Airport, JPdaily high max24.4 C (75.9 F)2.3 C (4.1 F)10 years13 of 100 (Routine)
5 November 1989Iwami Airport, JPdaily high min15.0 C (59.0 F)0.7 C (1.3 F)8 years7 of 100 (Routine)
17 October 1989Iwami Airport, JPdaily low max16.4 C (61.5 F)0.7 C (1.3 F)26 years12 of 100 (Routine)
19 September 1989Iwami Airport, JPdaily rain92.0 mm (3.6 in)11.2 mm (0.4 in)28 years15 of 100 (Routine)
17 September 1989Iwami Airport, JPdaily high max31.7 C (89.1 F)1.5 C (2.7 F)34 years17 of 100 (Routine)
9 September 1989Iwami Airport, JPdaily high max (Tie)32.2 C (90.0 F)tie19 years2 of 100 (Routine)
6 September 1989Iwami Airport, JPdaily low max22.7 C (72.9 F)1.0 C (1.8 F)18 years11 of 100 (Routine)
5 September 1989Iwami Airport, JPdaily low max23.8 C (74.8 F)0.8 C (1.4 F)28 years13 of 100 (Routine)
2 September 1989Iwami Airport, JPdaily rain101.5 mm (4.0 in)75.0 mm (3.0 in)15 years39 of 100 (Notable)
1 September 1989Iwami Airport, JPdaily rain99.0 mm (3.9 in)2.8 mm (0.11 in)36 years15 of 100 (Routine)
22 August 1989Iwami Airport, JPdaily high min27.0 C (80.6 F)0.5 C (0.9 F)10 years8 of 100 (Routine)
16 August 1989Iwami Airport, JPdaily low max26.7 C (80.1 F)0.4 C (0.7 F)6 years5 of 100 (Routine)
26 July 1989Iwami Airport, JPdaily high min (Tie)26.0 C (78.8 F)tie28 years2 of 100 (Routine)

Climate Trend

35 complete years, 1955 to 1989
Annual mean temperature at Iwami Airport as warming stripes, 1955 to 1989 One stripe for each of 35 complete years at Iwami Airport, 1955 to 1989. Blue stripes are years cooler than the station's own mean of 15.2 C (59.3 F); red stripes are warmer. The coolest year was 1965, at 14.5 C (58.1 F), and the warmest was 1961, at 16.2 C (61.2 F). The strongest colour marks a difference of 1.1 C (2.0 F). 1955: 15.5 C, +0.3 C from the station mean1956: 14.7 C, -0.5 C from the station mean1957: 14.7 C, -0.5 C from the station mean1958: 15.6 C, +0.4 C from the station mean1959: 15.9 C, +0.7 C from the station mean1960: 15.7 C, +0.6 C from the station mean1961: 16.2 C, +1.1 C from the station mean1962: 15.3 C, +0.1 C from the station mean1963: 14.9 C, -0.3 C from the station mean1964: 15.8 C, +0.6 C from the station mean1965: 14.5 C, -0.7 C from the station mean1966: 15.2 C, 0.0 C from the station mean1967: 15.1 C, -0.1 C from the station mean1968: 14.7 C, -0.5 C from the station mean1969: 15.1 C, -0.1 C from the station mean1970: 15.0 C, -0.2 C from the station mean1971: 15.1 C, -0.1 C from the station mean1972: 15.3 C, +0.1 C from the station mean1973: 15.5 C, +0.3 C from the station mean1974: 14.8 C, -0.4 C from the station mean1975: 15.4 C, +0.2 C from the station mean1976: 14.5 C, -0.7 C from the station mean1977: 15.1 C, -0.1 C from the station mean1978: 15.7 C, +0.5 C from the station mean1979: 15.8 C, +0.6 C from the station mean1980: 14.5 C, -0.7 C from the station mean1981: 14.8 C, -0.4 C from the station mean1982: 15.0 C, -0.2 C from the station mean1983: 15.3 C, +0.1 C from the station mean1984: 14.8 C, -0.4 C from the station mean1985: 15.3 C, +0.1 C from the station mean1986: 14.6 C, -0.6 C from the station mean1987: 15.6 C, +0.4 C from the station mean1988: 15.0 C, -0.2 C from the station mean1989: 15.8 C, +0.6 C from the station mean1955196019651970197519801985
One stripe for each of 35 complete years at Iwami Airport, 1955 to 1989. Blue stripes are years cooler than the station's own mean of 15.2 C (59.3 F); red stripes are warmer. The coolest year was 1965, at 14.5 C (58.1 F), and the warmest was 1961, at 16.2 C (61.2 F). The strongest colour marks a difference of 1.1 C (2.0 F).
Annual mean temperature at Iwami Airport as warming stripes, 1955 to 1989
YearAnnual mean temperatureDifference from the station mean
195515.5 C+0.34 C
195614.7 C-0.47 C
195714.7 C-0.50 C
195815.6 C+0.39 C
195915.9 C+0.69 C
196015.7 C+0.55 C
196116.2 C+1.05 C
196215.3 C+0.14 C
196314.9 C-0.31 C
196415.8 C+0.58 C
196514.5 C-0.69 C
196615.2 C+0.04 C
196715.1 C-0.13 C
196814.7 C-0.54 C
196915.1 C-0.13 C
197015.0 C-0.19 C
197115.1 C-0.11 C
197215.3 C+0.07 C
197315.5 C+0.28 C
197414.8 C-0.43 C
197515.4 C+0.19 C
197614.5 C-0.68 C
197715.1 C-0.09 C
197815.7 C+0.53 C
197915.8 C+0.57 C
198014.5 C-0.67 C
198114.8 C-0.39 C
198215.0 C-0.18 C
198315.3 C+0.10 C
198414.8 C-0.36 C
198515.3 C+0.10 C
198614.6 C-0.62 C
198715.6 C+0.40 C
198815.0 C-0.21 C
198915.8 C+0.56 C

The fitted trend in annual mean temperature here over 1955 to 1989 is -0.1 C (-0.2 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.4 to 0.2) per decade. The slope is a straight line fitted to 35 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Iwami Airport
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature-0.1 C (-0.2 to 0.1) per decade-0.1 F (-0.4 to 0.2) per decade1955 to 198935Not clearly different from zero
Mean daily maximum-0.13 C (-0.30 to 0.05) per decade-0.2 F (-0.5 to 0.1) per decade1955 to 198935Not clearly different from zero
Mean daily minimum0.00 C (-0.15 to 0.15) per decade0.00 F (-0.28 to 0.27) per decade1955 to 198935Not clearly different from zero

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

1951 to 1989
Yearly extremes at Iwami Airport: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)37.7 C (99.9 F)196035.1 C (95.2 F)35
Coldest night (TNn)-6.8 C (19.8 F)1981-2.8 C (27.0 F)35
Wettest day (Rx1day)250.5 mm (9.9 in)1985118.5 mm (4.7 in)39
Wettest five days (Rx5day)584.5 mm (23.0 in)1985213.1 mm (8.4 in)39
Longest dry spell (CDD)40 days195119 days39

Hottest day (TXx)

Hottest day (TXx) at Iwami Airport by year The hottest day of the year at Iwami Airport, 1951 to 1989. The record is 37.7 C (99.9 F) in 1960, marked on the chart; the median year is 35.1 C (95.2 F). 32343638196019701980Record: 37.7 C (99.9 F) in 1960
The hottest day of the year at Iwami Airport, 1951 to 1989. The record is 37.7 C (99.9 F) in 1960, marked on the chart; the median year is 35.1 C (95.2 F).
Hottest day (TXx) at Iwami Airport by year
YearHottest day (TXx)
1951n/a
1952n/a
1953n/a
1954n/a
195535.2 C (95.4 F)
195635.3 C (95.5 F)
195734.7 C (94.5 F)
195835.2 C (95.4 F)
195933.8 C (92.8 F)
196037.7 C (99.9 F)
196136.2 C (97.2 F)
196235.8 C (96.4 F)
196334.5 C (94.1 F)
196437.2 C (99.0 F)
196534.6 C (94.3 F)
196637.1 C (98.8 F)
196735.8 C (96.4 F)
196834.1 C (93.4 F)
196935.9 C (96.6 F)
197034.0 C (93.2 F)
197134.4 C (93.9 F)
197234.9 C (94.8 F)
197335.4 C (95.7 F)
197432.5 C (90.5 F)
197535.8 C (96.4 F)
197634.3 C (93.7 F)
197735.0 C (95.0 F)
197836.1 C (97.0 F)
197935.2 C (95.4 F)
198032.2 C (90.0 F)
198133.8 C (92.8 F)
198233.7 C (92.7 F)
198334.6 C (94.3 F)
198435.3 C (95.5 F)
198536.0 C (96.8 F)
198635.6 C (96.1 F)
198735.1 C (95.2 F)
198834.4 C (93.9 F)
198934.2 C (93.6 F)

Coldest night (TNn)

Coldest night (TNn) at Iwami Airport by year The coldest night of the year at Iwami Airport, 1951 to 1989. The record is -6.8 C (19.8 F) in 1981, marked on the chart; the median year is -2.8 C (27.0 F). -8-6-4-202196019701980Record: -6.8 C (19.8 F) in 1981
The coldest night of the year at Iwami Airport, 1951 to 1989. The record is -6.8 C (19.8 F) in 1981, marked on the chart; the median year is -2.8 C (27.0 F).
Coldest night (TNn) at Iwami Airport by year
YearColdest night (TNn)
1951n/a
1952n/a
1953n/a
1954n/a
1955-4.1 C (24.6 F)
1956-2.4 C (27.7 F)
1957-4.4 C (24.1 F)
1958-2.3 C (27.9 F)
1959-4.4 C (24.1 F)
1960-3.8 C (25.2 F)
1961-3.0 C (26.6 F)
1962-1.6 C (29.1 F)
1963-5.8 C (21.6 F)
1964-2.7 C (27.1 F)
1965-2.9 C (26.8 F)
1966-2.8 C (27.0 F)
1967-5.1 C (22.8 F)
1968-3.0 C (26.6 F)
1969-2.1 C (28.2 F)
1970-5.3 C (22.5 F)
1971-1.9 C (28.6 F)
1972-2.2 C (28.0 F)
1973-2.4 C (27.7 F)
1974-2.6 C (27.3 F)
1975-2.8 C (27.0 F)
1976-3.2 C (26.2 F)
1977-6.2 C (20.8 F)
1978-3.4 C (25.9 F)
1979-1.8 C (28.8 F)
1980-2.4 C (27.7 F)
1981-6.8 C (19.8 F)
1982-1.7 C (28.9 F)
1983-2.3 C (27.9 F)
1984-4.1 C (24.6 F)
1985-3.2 C (26.2 F)
1986-2.9 C (26.8 F)
1987-2.7 C (27.1 F)
1988-2.0 C (28.4 F)
19890.1 C (32.2 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Iwami Airport by year The wettest day of the year at Iwami Airport, 1951 to 1989. The record is 250.5 mm (9.9 in) in 1985, marked on the chart; the median year is 118.5 mm (4.7 in). 0100200300196019701980Record: 250.5 mm (9.9 in) in 1985
The wettest day of the year at Iwami Airport, 1951 to 1989. The record is 250.5 mm (9.9 in) in 1985, marked on the chart; the median year is 118.5 mm (4.7 in).
Wettest day (Rx1day) at Iwami Airport by year
YearWettest day (Rx1day)
1951158.9 mm (6.3 in)
1952119.9 mm (4.7 in)
1953147.9 mm (5.8 in)
1954193.1 mm (7.6 in)
1955119.5 mm (4.7 in)
1956106.7 mm (4.2 in)
1957101.9 mm (4.0 in)
1958119.5 mm (4.7 in)
1959124.9 mm (4.9 in)
1960130.7 mm (5.1 in)
1961129.2 mm (5.1 in)
1962115.3 mm (4.5 in)
1963153.5 mm (6.0 in)
196480.3 mm (3.2 in)
1965117.6 mm (4.6 in)
1966125.6 mm (4.9 in)
196748.5 mm (1.9 in)
196891.0 mm (3.6 in)
1969115.0 mm (4.5 in)
197080.0 mm (3.1 in)
1971155.0 mm (6.1 in)
1972215.0 mm (8.5 in)
197370.0 mm (2.8 in)
1974121.0 mm (4.8 in)
1975177.5 mm (7.0 in)
197675.5 mm (3.0 in)
197768.0 mm (2.7 in)
197880.0 mm (3.1 in)
197977.0 mm (3.0 in)
1980170.0 mm (6.7 in)
1981163.5 mm (6.4 in)
198276.0 mm (3.0 in)
198399.0 mm (3.9 in)
1984114.5 mm (4.5 in)
1985250.5 mm (9.9 in)
1986118.5 mm (4.7 in)
1987169.5 mm (6.7 in)
198865.0 mm (2.6 in)
1989101.5 mm (4.0 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Iwami Airport by year The wettest five days of the year at Iwami Airport, 1951 to 1989. The record is 584.5 mm (23.0 in) in 1985, marked on the chart; the median year is 213.1 mm (8.4 in). 0200400600196019701980Record: 584.5 mm (23.0 in) in 1985
The wettest five days of the year at Iwami Airport, 1951 to 1989. The record is 584.5 mm (23.0 in) in 1985, marked on the chart; the median year is 213.1 mm (8.4 in).
Wettest five days (Rx5day) at Iwami Airport by year
YearWettest five days (Rx5day)
1951301.8 mm (11.9 in)
1952213.1 mm (8.4 in)
1953313.1 mm (12.3 in)
1954220.7 mm (8.7 in)
1955251.9 mm (9.9 in)
1956190.5 mm (7.5 in)
1957183.2 mm (7.2 in)
1958178.6 mm (7.0 in)
1959290.8 mm (11.4 in)
1960178.8 mm (7.0 in)
1961153.9 mm (6.1 in)
1962337.6 mm (13.3 in)
1963242.1 mm (9.5 in)
1964205.1 mm (8.1 in)
1965255.9 mm (10.1 in)
1966187.2 mm (7.4 in)
1967139.0 mm (5.5 in)
1968269.5 mm (10.6 in)
1969185.5 mm (7.3 in)
1970155.0 mm (6.1 in)
1971251.5 mm (9.9 in)
1972489.0 mm (19.3 in)
1973109.0 mm (4.3 in)
1974216.0 mm (8.5 in)
1975216.5 mm (8.5 in)
1976186.5 mm (7.3 in)
1977109.0 mm (4.3 in)
1978127.5 mm (5.0 in)
1979258.0 mm (10.2 in)
1980329.0 mm (13.0 in)
1981421.0 mm (16.6 in)
1982146.5 mm (5.8 in)
1983195.0 mm (7.7 in)
1984207.0 mm (8.1 in)
1985584.5 mm (23.0 in)
1986175.0 mm (6.9 in)
1987214.0 mm (8.4 in)
1988112.0 mm (4.4 in)
1989228.5 mm (9.0 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Iwami Airport by year The longest dry spell of the year at Iwami Airport, 1951 to 1989. The record is 40 days in 1951, marked on the chart; the median year is 19 days. 10203040196019701980Record: 40 days in 1951
The longest dry spell of the year at Iwami Airport, 1951 to 1989. The record is 40 days in 1951, marked on the chart; the median year is 19 days.
Longest dry spell (CDD) at Iwami Airport by year
YearLongest dry spell (CDD)
195140 days
195212 days
195319 days
195416 days
195529 days
195626 days
195711 days
195826 days
195920 days
196031 days
196123 days
196210 days
196315 days
196433 days
196517 days
196619 days
196725 days
196811 days
196918 days
197020 days
197114 days
197215 days
197321 days
197413 days
197520 days
197610 days
197723 days
197816 days
197915 days
198017 days
198118 days
198212 days
198325 days
198420 days
198519 days
198622 days
198719 days
198812 days
198923 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

39 years, 1951 to 1989

A day with at least 115.2 mm (4.5 in) of rain is expected about once in 2 years. A day with at least 255.8 mm (10.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Iwami Airport: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years115.2 mm (4.5 in)
5 years154.8 mm (6.1 in)
10 years180.2 mm (7.1 in)
25 years211.4 mm (8.3 in)
50 years234.0 mm (9.2 in)Longer than the 39 years of record
100 years255.8 mm (10.1 in)Longer than the 39 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, 39 years of values from 1951 to 1989.

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: 250.5 mm (9.9 in) in 1985; 215.0 mm (8.5 in) in 1972; 193.1 mm (7.6 in) in 1954.

Download the Data

  • Data for Iwami Airport standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Iwami Airport 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).