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Built 2026-10-19 (19 October 2026)

Mantta Raja-Aho Threshold Days by Year (FIE00143646)

3 fixed thresholds counted per year at Mantta Raja-Aho (FIE00143646): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mantta Raja-Aho Thresholds

  • Mantta Raja-Aho: days with 10 mm (0.39 in) or more of precipitation in 30 years, most in 1992 with 22.
  • Mantta Raja-Aho: days with 25 mm (0.98 in) or more of precipitation in 21 years, most in 1974 with 4.
  • Mantta Raja-Aho: days with 50 mm (1.97 in) or more of precipitation in 1 years, most in 1993 with 1.
  • 3 fixed thresholds have at least one qualifying day at Mantta Raja-Aho.
30 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Mantta Raja-Aho Days per year at Mantta Raja-Aho with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 22 in 1992. 01020301965: 51966: 121967: 161968: 121969: 151970: 151971: 81972: 161973: 141974: 181975: 111976: 71977: 161978: 131979: 161980: 121981: 191982: 121983: 161984: 161985: 111986: 181987: 161988: 181989: 141990: 131991: 121992: 221993: 141994: 131965196819711974197719801983198619891992
Days per year at Mantta Raja-Aho with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 22 in 1992.
Days with 10 mm (0.39 in) or more of precipitation per year at Mantta Raja-Aho
YearDaysDecade average
1965512
19661212
19671612
19681212
19691512
19701513.4
1971813.4
19721613.4
19731413.4
19741813.4
19751113.4
1976713.4
19771613.4
19781313.4
19791613.4
19801215.2
19811915.2
19821215.2
19831615.2
19841615.2
19851115.2
19861815.2
19871615.2
19881815.2
19891415.2
19901314.8
19911214.8
19922214.8
19931414.8
19941314.8
First to last qualifying date each year at Mantta Raja-Aho For each year, a bar from the first to the last day at Mantta Raja-Aho meeting 10 mm (0.39 in). 1965: 19 May 1965 to 13 September 19651966: 26 June 1966 to 4 December 19661967: 21 March 1967 to 24 October 19671968: 25 March 1968 to 4 November 19681969: 29 January 1969 to 23 November 19691970: 28 April 1970 to 20 December 19701971: 8 June 1971 to 29 August 19711972: 8 February 1972 to 23 August 19721973: 26 April 1973 to 8 November 19731974: 21 March 1974 to 4 December 19741975: 5 January 1975 to 29 November 19751976: 29 March 1976 to 15 September 19761977: 27 January 1977 to 4 November 19771978: 6 March 1978 to 14 November 19781979: 13 January 1979 to 29 November 19791980: 8 May 1980 to 22 November 19801981: 24 March 1981 to 3 December 19811982: 24 May 1982 to 15 December 19821983: 5 January 1983 to 30 December 19831984: 31 March 1984 to 5 November 19841985: 2 April 1985 to 11 November 19851986: 21 January 1986 to 5 December 19861987: 4 May 1987 to 29 December 19871988: 16 February 1988 to 13 December 19881989: 13 January 1989 to 21 October 19891990: 21 February 1990 to 14 September 19901991: 18 March 1991 to 29 December 19911992: 3 February 1992 to 12 November 19921993: 11 January 1993 to 16 December 19931994: 24 March 1994 to 15 October 199419651969197319771981198519891993JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Mantta Raja-Aho meeting 10 mm (0.39 in).
First to last qualifying date each year at Mantta Raja-Aho
YearFirst dateLast date
19651965-05-191965-09-13
19661966-06-261966-12-04
19671967-03-211967-10-24
19681968-03-251968-11-04
19691969-01-291969-11-23
19701970-04-281970-12-20
19711971-06-081971-08-29
19721972-02-081972-08-23
19731973-04-261973-11-08
19741974-03-211974-12-04
19751975-01-051975-11-29
19761976-03-291976-09-15
19771977-01-271977-11-04
19781978-03-061978-11-14
19791979-01-131979-11-29
19801980-05-081980-11-22
19811981-03-241981-12-03
19821982-05-241982-12-15
19831983-01-051983-12-30
19841984-03-311984-11-05
19851985-04-021985-11-11
19861986-01-211986-12-05
19871987-05-041987-12-29
19881988-02-161988-12-13
19891989-01-131989-10-21
19901990-02-211990-09-14
19911991-03-181991-12-29
19921992-02-031992-11-12
19931993-01-111993-12-16
19941994-03-241994-10-15

Every Fixed Threshold

Fixed thresholds at Mantta Raja-Aho
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3022199213
25 mm (0.98 in): Days with 25 mm or more rain21419742
50 mm (1.97 in): Days with 50 mm or more rain1119931

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1965.

Download the Data

  • Data for Mantta Raja-Aho 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). Threshold counts are computed by this site.

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