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Data as of 2025-12-31
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Built 2026-10-18 (18 October 2026)

Istisu Weather Records (AJ000037883)

Record envelope, standing records and threshold days for Istisu (AJ000037883), Azerbaijan, with 33 years of record.

Key Facts for Istisu

  • Istisu (AJ000037883) is a weather station in Azerbaijan at 39.90 latitude and 45.90 longitude, 2,064 m (6,772 ft) above sea level.
  • The station reports from 1955 to 1987, 33 years of record.
  • 0 records set at Istisu still stand.
  • Records are tracked for prcp: an element needs 30 years of data to be eligible.
  • Istisu set a daily record precipitation of 4.0 mm (0.16 in) on 26 December 1987.

About the Station

  • Location: Azerbaijan, 39.90 latitude, 45.90 longitude.
  • Elevation: 2,064 m (6,772 ft).
  • Period of record: 1955 to 1987, 33 years.
  • Eligible elements: prcp.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Istisu, with 2026 drawn through them The band shows the record high and record low for each calendar day at Istisu. 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 Istisu. 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 Istisu, 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 Istisu by the year they were set 0 records at Istisu still stand. 00000000000
0 records at Istisu still stand.
Standing records at Istisu by the year they were set
Year setStanding records

Wettest Day of Each Month

Nov: 80.2 mm (3.2 in)
Record daily precipitation for each month at Istisu The wettest day on record for each calendar month at Istisu. The most was 80.2 mm (3.2 in) on 13 November 1975. 0255075100 Jan: 15.5 mm (0.6 in), 14 January 1982 Jan Feb: 22.5 mm (0.9 in), 23 February 1975 Feb Mar: 25.8 mm (1.0 in), 24 March 1982 Mar Apr: 58.5 mm (2.3 in), 1 April 1969 Apr May: 31.1 mm (1.2 in), 1 May 1959 May Jun: 32.1 mm (1.3 in), 7 June 1968 Jun Jul: 56.9 mm (2.2 in), 28 July 1955 Jul Aug: 47.4 mm (1.9 in), 5 August 1966 Aug Sep: 34.7 mm (1.4 in), 10 September 1969 Sep Oct: 31.9 mm (1.3 in), 18 October 1977 Oct Nov: 80.2 mm (3.2 in), 13 November 1975 Nov Dec: 25.8 mm (1.0 in), 12 December 1968 Dec
The wettest day on record for each calendar month at Istisu. The most was 80.2 mm (3.2 in) on 13 November 1975.
Record daily precipitation for each month at Istisu
MonthRecord daily precipitation (mm)Date
Jan15.5 mm (0.6 in)14 January 1982
Feb22.5 mm (0.9 in)23 February 1975
Mar25.8 mm (1.0 in)24 March 1982
Apr58.5 mm (2.3 in)1 April 1969
May31.1 mm (1.2 in)1 May 1959
Jun32.1 mm (1.3 in)7 June 1968
Jul56.9 mm (2.2 in)28 July 1955
Aug47.4 mm (1.9 in)5 August 1966
Sep34.7 mm (1.4 in)10 September 1969
Oct31.9 mm (1.3 in)18 October 1977
Nov80.2 mm (3.2 in)13 November 1975
Dec25.8 mm (1.0 in)12 December 1968

Latest Records

20
Latest records at Istisu
DateStationRecordValueBeat old record byOld record stoodSignificance
26 December 1987Istisu, AZdaily rain4.0 mm (0.16 in)2.0 mm (0.08 in)20 years14 of 100 (Routine)
25 December 1987Istisu, AZdaily rain4.8 mm (0.19 in)1.4 mm (0.06 in)24 years13 of 100 (Routine)
19 December 1987Istisu, AZdaily rain22.0 mm (0.9 in)20.0 mm (0.8 in)29 years20 of 100 (Routine)
7 December 1987Istisu, AZdaily rain9.0 mm (0.35 in)1.8 mm (0.07 in)16 years11 of 100 (Routine)
7 November 1987Istisu, AZdaily rain12.6 mm (0.5 in)6.1 mm (0.24 in)24 years19 of 100 (Routine)
6 November 1987Istisu, AZdaily rain6.6 mm (0.26 in)1.0 mm (0.04 in)28 years12 of 100 (Routine)
27 October 1987Istisu, AZdaily rain (Tie)5.0 mm (0.20 in)tie22 years2 of 100 (Routine)
26 October 1987Istisu, AZdaily rain10.7 mm (0.4 in)7.1 mm (0.28 in)10 years20 of 100 (Routine)
4 October 1987Istisu, AZdaily rain25.3 mm (1.0 in)19.3 mm (0.8 in)12 years46 of 100 (Notable)
26 August 1987Istisu, AZdaily rain19.3 mm (0.8 in)6.7 mm (0.26 in)20 years20 of 100 (Routine)
23 July 1987Istisu, AZdaily rain20.6 mm (0.8 in)7.1 mm (0.28 in)13 years17 of 100 (Routine)
9 July 1987Istisu, AZdaily rain6.4 mm (0.25 in)0.8 mm (0.03 in)20 years10 of 100 (Routine)
22 May 1987Istisu, AZdaily rain18.5 mm (0.7 in)11.2 mm (0.4 in)5 years20 of 100 (Routine)
11 May 1987Istisu, AZdaily rain12.1 mm (0.5 in)1.7 mm (0.07 in)16 years11 of 100 (Routine)
17 April 1987Istisu, AZdaily rain21.1 mm (0.8 in)3.0 mm (0.12 in)28 years16 of 100 (Routine)
8 February 1987Istisu, AZdaily rain10.6 mm (0.4 in)5.1 mm (0.20 in)21 years20 of 100 (Routine)
25 January 1987Istisu, AZdaily rain (Tie)2.7 mm (0.11 in)tie19 years2 of 100 (Routine)
27 December 1986Istisu, AZdaily rain2.9 mm (0.11 in)0.5 mm (0.02 in)17 years9 of 100 (Routine)
22 December 1986Istisu, AZdaily rain10.0 mm (0.4 in)5.3 mm (0.21 in)29 years20 of 100 (Routine)
29 November 1986Istisu, AZdaily rain16.5 mm (0.6 in)6.7 mm (0.26 in)31 years20 of 100 (Routine)

Extremes by Year

1955 to 1987
Yearly extremes at Istisu: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Wettest day (Rx1day)80.2 mm (3.2 in)197526.5 mm (1.0 in)33
Wettest five days (Rx5day)81.3 mm (3.2 in)197549.2 mm (1.9 in)33
Longest dry spell (CDD)57 days197423 days33

Wettest day (Rx1day)

Wettest day (Rx1day) at Istisu by year The wettest day of the year at Istisu, 1955 to 1987. The record is 80.2 mm (3.2 in) in 1975, marked on the chart; the median year is 26.5 mm (1.0 in). 020406080100196019701980Record: 80.2 mm (3.2 in) in 1975
The wettest day of the year at Istisu, 1955 to 1987. The record is 80.2 mm (3.2 in) in 1975, marked on the chart; the median year is 26.5 mm (1.0 in).
Wettest day (Rx1day) at Istisu by year
YearWettest day (Rx1day)
195556.9 mm (2.2 in)
195624.7 mm (1.0 in)
195730.2 mm (1.2 in)
195826.3 mm (1.0 in)
195931.1 mm (1.2 in)
196025.7 mm (1.0 in)
196119.2 mm (0.8 in)
196228.2 mm (1.1 in)
196317.9 mm (0.7 in)
196419.4 mm (0.8 in)
196526.3 mm (1.0 in)
196647.4 mm (1.9 in)
196728.3 mm (1.1 in)
196832.1 mm (1.3 in)
196958.5 mm (2.3 in)
197016.3 mm (0.6 in)
197126.5 mm (1.0 in)
197218.2 mm (0.7 in)
197317.6 mm (0.7 in)
197427.2 mm (1.1 in)
197580.2 mm (3.2 in)
197629.8 mm (1.2 in)
197731.9 mm (1.3 in)
197834.0 mm (1.3 in)
197916.1 mm (0.6 in)
198047.4 mm (1.9 in)
198116.8 mm (0.7 in)
198226.6 mm (1.0 in)
198338.6 mm (1.5 in)
198426.5 mm (1.0 in)
198520.8 mm (0.8 in)
198621.2 mm (0.8 in)
198725.3 mm (1.0 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Istisu by year The wettest five days of the year at Istisu, 1955 to 1987. The record is 81.3 mm (3.2 in) in 1975, marked on the chart; the median year is 49.2 mm (1.9 in). 20406080100196019701980Record: 81.3 mm (3.2 in) in 1975
The wettest five days of the year at Istisu, 1955 to 1987. The record is 81.3 mm (3.2 in) in 1975, marked on the chart; the median year is 49.2 mm (1.9 in).
Wettest five days (Rx5day) at Istisu by year
YearWettest five days (Rx5day)
195568.3 mm (2.7 in)
195640.2 mm (1.6 in)
195745.7 mm (1.8 in)
195856.0 mm (2.2 in)
195952.6 mm (2.1 in)
196038.6 mm (1.5 in)
196133.0 mm (1.3 in)
196238.5 mm (1.5 in)
196343.7 mm (1.7 in)
196450.0 mm (2.0 in)
196558.0 mm (2.3 in)
196649.2 mm (1.9 in)
196742.3 mm (1.7 in)
196866.8 mm (2.6 in)
196973.0 mm (2.9 in)
197027.2 mm (1.1 in)
197142.1 mm (1.7 in)
197272.3 mm (2.8 in)
197336.0 mm (1.4 in)
197460.6 mm (2.4 in)
197581.3 mm (3.2 in)
197651.7 mm (2.0 in)
197744.3 mm (1.7 in)
197859.6 mm (2.3 in)
197926.7 mm (1.1 in)
198055.1 mm (2.2 in)
198135.5 mm (1.4 in)
198264.6 mm (2.5 in)
198347.9 mm (1.9 in)
198446.2 mm (1.8 in)
198550.4 mm (2.0 in)
198650.1 mm (2.0 in)
198738.5 mm (1.5 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Istisu by year The longest dry spell of the year at Istisu, 1955 to 1987. The record is 57 days in 1974, marked on the chart; the median year is 23 days. 0204060196019701980Record: 57 days in 1974
The longest dry spell of the year at Istisu, 1955 to 1987. The record is 57 days in 1974, marked on the chart; the median year is 23 days.
Longest dry spell (CDD) at Istisu by year
YearLongest dry spell (CDD)
195516 days
195628 days
195718 days
195822 days
195911 days
196034 days
196128 days
196215 days
196322 days
196423 days
196530 days
196623 days
196717 days
196822 days
196913 days
197021 days
197127 days
197219 days
197322 days
197457 days
197532 days
197640 days
197721 days
197834 days
197936 days
198035 days
198120 days
198226 days
198342 days
198426 days
198524 days
198620 days
198717 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

32 years, 1955 to 1987

A day with at least 25.5 mm (1.0 in) of rain is expected about once in 2 years. A day with at least 88.8 mm (3.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Istisu: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years25.5 mm (1.0 in)
5 years35.8 mm (1.4 in)
10 years44.6 mm (1.8 in)
25 years58.9 mm (2.3 in)
50 years72.4 mm (2.9 in)Longer than the 32 years of record
100 years88.8 mm (3.5 in)Longer than the 32 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, 32 years of values from 1955 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: 80.2 mm (3.2 in) in 1975; 58.5 mm (2.3 in) in 1969; 56.9 mm (2.2 in) in 1955.

Download the Data

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