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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

Iol Weather Records (TI000038946)

Record envelope, standing records and threshold days for Iol (TI000038946), Tajikistan, with 53 years of record.

Key Facts for Iol

  • Iol (TI000038946) is a weather station in Tajikistan at 37.80 latitude and 70.20 longitude, 1,283 m (4,209 ft) above sea level.
  • The station reports from 1936 to 1988, 53 years of record.
  • 0 records set at Iol still stand.
  • Records are tracked for prcp: an element needs 30 years of data to be eligible.
  • Iol set a daily record precipitation of 37.1 mm (1.5 in) on 18 April 1988.

About the Station

  • Location: Tajikistan, 37.80 latitude, 70.20 longitude.
  • Elevation: 1,283 m (4,209 ft).
  • Period of record: 1936 to 1988, 53 years.
  • Eligible elements: prcp.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Iol, with 2026 drawn through them The band shows the record high and record low for each calendar day at Iol. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. 000111 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Iol. 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 Iol, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
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Which Years Hold Standing Records

0 standing records
Standing records at Iol by the year they were set 0 records at Iol still stand. 00000000000
0 records at Iol still stand.
Standing records at Iol by the year they were set
Year setStanding records

Wettest Day of Each Month

Oct: 78.3 mm (3.1 in)
Record daily precipitation for each month at Iol The wettest day on record for each calendar month at Iol. The most was 78.3 mm (3.1 in) on 24 October 1937. 020406080 Jan: 40.0 mm (1.6 in), 29 January 1975 Jan Feb: 43.2 mm (1.7 in), 5 February 1952 Feb Mar: 46.5 mm (1.8 in), 7 March 1987 Mar Apr: 63.9 mm (2.5 in), 9 April 1937 Apr May: 51.8 mm (2.0 in), 2 May 1954 May Jun: 35.0 mm (1.4 in), 13 June 1962 Jun Jul: 37.0 mm (1.5 in), 10 July 1965 Jul Aug: 12.5 mm (0.5 in), 8 August 1986 Aug Sep: 10.0 mm (0.4 in), 20 September 1982 Sep Oct: 78.3 mm (3.1 in), 24 October 1937 Oct Nov: 31.6 mm (1.2 in), 16 November 1962 Nov Dec: 30.4 mm (1.2 in), 21 December 1986 Dec
The wettest day on record for each calendar month at Iol. The most was 78.3 mm (3.1 in) on 24 October 1937.
Record daily precipitation for each month at Iol
MonthRecord daily precipitation (mm)Date
Jan40.0 mm (1.6 in)29 January 1975
Feb43.2 mm (1.7 in)5 February 1952
Mar46.5 mm (1.8 in)7 March 1987
Apr63.9 mm (2.5 in)9 April 1937
May51.8 mm (2.0 in)2 May 1954
Jun35.0 mm (1.4 in)13 June 1962
Jul37.0 mm (1.5 in)10 July 1965
Aug12.5 mm (0.5 in)8 August 1986
Sep10.0 mm (0.4 in)20 September 1982
Oct78.3 mm (3.1 in)24 October 1937
Nov31.6 mm (1.2 in)16 November 1962
Dec30.4 mm (1.2 in)21 December 1986

Latest Records

20
Latest records at Iol
DateStationRecordValueBeat old record byOld record stoodSignificance
18 April 1988Iol, TJdaily rain37.1 mm (1.5 in)9.0 mm (0.35 in)9 years17 of 100 (Routine)
2 April 1988Iol, TJdaily rain42.1 mm (1.7 in)7.2 mm (0.28 in)4 years14 of 100 (Routine)
10 March 1988Iol, TJdaily rain41.3 mm (1.6 in)8.8 mm (0.35 in)27 years24 of 100 (Routine)
30 December 1987Iol, TJdaily rain9.8 mm (0.39 in)0.9 mm (0.04 in)28 years14 of 100 (Routine)
28 October 1987Iol, TJdaily rain23.9 mm (0.9 in)11.5 mm (0.5 in)36 years20 of 100 (Routine)
27 October 1987Iol, TJdaily rain43.4 mm (1.7 in)25.2 mm (1.0 in)17 years40 of 100 (Notable)
26 October 1987Iol, TJdaily rain19.7 mm (0.8 in)6.7 mm (0.26 in)33 years20 of 100 (Routine)
11 October 1987Iol, TJdaily rain5.9 mm (0.23 in)3.9 mm (0.15 in)17 years14 of 100 (Routine)
15 August 1987Iol, TJdaily rain0.7 mm (0.03 in)0.7 mm (0.03 in)50 years20 of 100 (Routine)
18 June 1987Iol, TJdaily rain0.6 mm (0.02 in)0.1 mm (0.00 in)14 years9 of 100 (Routine)
21 April 1987Iol, TJdaily rain60.6 mm (2.4 in)10.4 mm (0.4 in)28 years25 of 100 (Routine)
6 April 1987Iol, TJdaily rain29.8 mm (1.2 in)20.0 mm (0.8 in)18 years33 of 100 (Routine)
7 March 1987Iol, TJmonthly rain46.5 mm (1.8 in)6.9 mm (0.27 in)17 years29 of 100 (Routine)
6 March 1987Iol, TJdaily rain39.1 mm (1.5 in)10.5 mm (0.4 in)38 years30 of 100 (Routine)
1 January 1987Iol, TJdaily rain13.3 mm (0.5 in)0.1 mm (0.00 in)36 years15 of 100 (Routine)
29 December 1986Iol, TJdaily rain25.9 mm (1.0 in)18.0 mm (0.7 in)16 years46 of 100 (Notable)
21 December 1986Iol, TJmonthly rain30.4 mm (1.2 in)4.3 mm (0.17 in)0 years23 of 100 (Routine)
6 December 1986Iol, TJmonthly rain26.1 mm (1.0 in)2.3 mm (0.09 in)13 years23 of 100 (Routine)
12 November 1986Iol, TJdaily rain10.8 mm (0.4 in)1.4 mm (0.06 in)12 years10 of 100 (Routine)
15 October 1986Iol, TJdaily rain19.2 mm (0.8 in)2.4 mm (0.09 in)4 years8 of 100 (Routine)

Extremes by Year

1936 to 1988
Yearly extremes at Iol: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Wettest day (Rx1day)78.3 mm (3.1 in)193734.7 mm (1.4 in)45
Wettest five days (Rx5day)148.6 mm (5.9 in)193765.3 mm (2.6 in)45
Longest dry spell (CDD)161 days197868 days45

Wettest day (Rx1day)

Wettest day (Rx1day) at Iol by year The wettest day of the year at Iol, 1936 to 1988. The record is 78.3 mm (3.1 in) in 1937, marked on the chart; the median year is 34.7 mm (1.4 in). 02040608019401950196019701980Record: 78.3 mm (3.1 in) in 1937
The wettest day of the year at Iol, 1936 to 1988. The record is 78.3 mm (3.1 in) in 1937, marked on the chart; the median year is 34.7 mm (1.4 in).
Wettest day (Rx1day) at Iol by year
YearWettest day (Rx1day)
193615.8 mm (0.6 in)
193778.3 mm (3.1 in)
194610.6 mm (0.4 in)
194718.1 mm (0.7 in)
194828.6 mm (1.1 in)
194942.1 mm (1.7 in)
195042.3 mm (1.7 in)
195138.9 mm (1.5 in)
195243.2 mm (1.7 in)
195336.8 mm (1.4 in)
195451.8 mm (2.0 in)
195527.0 mm (1.1 in)
195633.1 mm (1.3 in)
195729.1 mm (1.1 in)
195850.2 mm (2.0 in)
195931.7 mm (1.2 in)
196036.1 mm (1.4 in)
196132.5 mm (1.3 in)
196237.0 mm (1.5 in)
196329.7 mm (1.2 in)
196428.4 mm (1.1 in)
196537.0 mm (1.5 in)
196634.4 mm (1.4 in)
196734.3 mm (1.4 in)
196826.3 mm (1.0 in)
196939.6 mm (1.6 in)
197039.1 mm (1.5 in)
197118.5 mm (0.7 in)
197236.4 mm (1.4 in)
197332.4 mm (1.3 in)
197430.2 mm (1.2 in)
197540.0 mm (1.6 in)
197640.0 mm (1.6 in)
197750.9 mm (2.0 in)
197837.1 mm (1.5 in)
197934.7 mm (1.4 in)
198026.7 mm (1.1 in)
198132.9 mm (1.3 in)
198230.1 mm (1.2 in)
198330.6 mm (1.2 in)
198454.0 mm (2.1 in)
198538.7 mm (1.5 in)
198630.4 mm (1.2 in)
198760.6 mm (2.4 in)
198842.1 mm (1.7 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Iol by year The wettest five days of the year at Iol, 1936 to 1988. The record is 148.6 mm (5.9 in) in 1937, marked on the chart; the median year is 65.3 mm (2.6 in). 05010015019401950196019701980Record: 148.6 mm (5.9 in) in 1937
The wettest five days of the year at Iol, 1936 to 1988. The record is 148.6 mm (5.9 in) in 1937, marked on the chart; the median year is 65.3 mm (2.6 in).
Wettest five days (Rx5day) at Iol by year
YearWettest five days (Rx5day)
193626.5 mm (1.0 in)
1937148.6 mm (5.9 in)
194618.0 mm (0.7 in)
194734.4 mm (1.4 in)
194853.9 mm (2.1 in)
194964.6 mm (2.5 in)
195065.3 mm (2.6 in)
195175.3 mm (3.0 in)
195290.8 mm (3.6 in)
195373.7 mm (2.9 in)
195474.6 mm (2.9 in)
195558.0 mm (2.3 in)
195669.9 mm (2.8 in)
195769.5 mm (2.7 in)
195874.2 mm (2.9 in)
195980.3 mm (3.2 in)
196077.4 mm (3.0 in)
196137.6 mm (1.5 in)
196276.5 mm (3.0 in)
196368.4 mm (2.7 in)
196451.1 mm (2.0 in)
196551.8 mm (2.0 in)
196658.2 mm (2.3 in)
196750.6 mm (2.0 in)
196856.4 mm (2.2 in)
196988.6 mm (3.5 in)
197062.2 mm (2.4 in)
197133.1 mm (1.3 in)
197272.6 mm (2.9 in)
197376.3 mm (3.0 in)
197457.5 mm (2.3 in)
197573.3 mm (2.9 in)
197667.1 mm (2.6 in)
197760.5 mm (2.4 in)
197847.0 mm (1.9 in)
197945.0 mm (1.8 in)
198053.3 mm (2.1 in)
198188.3 mm (3.5 in)
198267.6 mm (2.7 in)
198359.8 mm (2.4 in)
198476.8 mm (3.0 in)
198565.3 mm (2.6 in)
198652.8 mm (2.1 in)
1987104.0 mm (4.1 in)
198873.0 mm (2.9 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Iol by year The longest dry spell of the year at Iol, 1936 to 1988. The record is 161 days in 1978, marked on the chart; the median year is 68 days. 05010015020019401950196019701980Record: 161 days in 1978
The longest dry spell of the year at Iol, 1936 to 1988. The record is 161 days in 1978, marked on the chart; the median year is 68 days.
Longest dry spell (CDD) at Iol by year
YearLongest dry spell (CDD)
193655 days
193765 days
194643 days
194786 days
194817 days
194913 days
1950134 days
195187 days
195269 days
195359 days
195436 days
1955129 days
195670 days
195757 days
195837 days
195968 days
196058 days
1961120 days
196281 days
1963135 days
196437 days
196539 days
196649 days
1967111 days
1968105 days
196943 days
197056 days
1971120 days
197237 days
197386 days
197449 days
1975109 days
1976106 days
1977127 days
1978161 days
197982 days
1980119 days
198132 days
198274 days
198365 days
1984113 days
1985110 days
198652 days
198750 days
198817 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

38 years, 1936 to 1987

A day with at least 34.8 mm (1.4 in) of rain is expected about once in 2 years. A day with at least 60.1 mm (2.4 in) of rain is expected about once in 100 years.

Rainfall return levels at Iol: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years34.8 mm (1.4 in)
5 years43.3 mm (1.7 in)
10 years48.1 mm (1.9 in)
25 years53.5 mm (2.1 in)
50 years57.0 mm (2.2 in)Longer than the 38 years of record
100 years60.1 mm (2.4 in)Longer than the 38 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, 38 years of values from 1936 to 1987.

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: 60.6 mm (2.4 in) in 1987; 54.0 mm (2.1 in) in 1984; 51.8 mm (2.0 in) in 1954.

Download the Data

  • Data for Iol standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Iol 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 . Last revised (2025-12-31).