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

Iruma Threshold Days by Year (JAW00043309)

15 fixed thresholds counted per year at Iruma (JAW00043309): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Iruma Thresholds

  • Iruma: days with a maximum temperature at or above 30 C (86 F) in 13 years, most in 1950 with 61.
  • Iruma: days with a maximum temperature at or above 90 F (32.2 C) in 13 years, most in 1950 with 33.
  • Iruma: nights with a minimum temperature at or below 0 C (32 F) in 13 years, most in 1956 with 86.
  • Iruma: nights with a minimum temperature at or above 20 C (68 F) in 13 years, most in 1950 with 82.
  • 15 fixed thresholds have at least one qualifying day at Iruma.
13 years with a qualifying day
Days at or above 30 C (86 F) per year at Iruma Days per year at Iruma with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 61 in 1950. 02550751001949: 441950: 611951: 441952: 381953: 261954: 381955: 541956: 411957: 311958: 421959: 391960: 432025: 841949195119531955195719592025
Days per year at Iruma with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 61 in 1950.
Days at or above 30 C (86 F) per year at Iruma
YearDaysDecade average
19494444
19506141.4
19514441.4
19523841.4
19532641.4
19543841.4
19555441.4
19564141.4
19573141.4
19584241.4
19593941.4
19604343
20258484
First to last qualifying date each year at Iruma For each year, a bar from the first to the last day at Iruma meeting 30 C (86 F). 1949: 1 July 1949 to 17 September 19491950: 21 June 1950 to 19 September 19501951: 30 May 1951 to 10 September 19511952: 24 June 1952 to 12 September 19521953: 16 June 1953 to 26 September 19531954: 25 July 1954 to 24 September 19541955: 7 June 1955 to 16 September 19551956: 11 May 1956 to 11 September 19561957: 20 June 1957 to 8 September 19571958: 30 May 1958 to 18 September 19581959: 6 July 1959 to 27 September 19591960: 28 June 1960 to 19 September 19602025: 6 June 2025 to 29 September 20251949195119531955195719592025JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Iruma meeting 30 C (86 F).
First to last qualifying date each year at Iruma
YearFirst dateLast date
19491949-07-011949-09-17
19501950-06-211950-09-19
19511951-05-301951-09-10
19521952-06-241952-09-12
19531953-06-161953-09-26
19541954-07-251954-09-24
19551955-06-071955-09-16
19561956-05-111956-09-11
19571957-06-201957-09-08
19581958-05-301958-09-18
19591959-07-061959-09-27
19601960-06-281960-09-19
20252025-06-062025-09-29

Every Fixed Threshold

Fixed thresholds at Iruma
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days1361195084
35 C (95 F): Days118194940
40 C (104 F): Days10n/a1
90 F (32.2 C): Days1333195063
100 F (37.8 C): Days10n/a2
0 C (32 F): Frost days (min1386195638
20 C (68 F): Tropical nights (min13821950100
25 C (77 F): Days with min103195352
10 mm (0.39 in): Days with 10 mm or more rain1253195439
25 mm (0.98 in): Days with 25 mm or more rain1224195314
50 mm (1.97 in): Days with 50 mm or more rain12919502
100 mm (3.94 in): Days with 100 mm or more rain8219492
200 mm (7.87 in): Days with 200 mm or more rain1119581
10 cm (3.9 in): Days with 10 cm or more snowfall9419521
25 cm (9.8 in): Days with 25 cm or more snowfall2119531

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1949.

Download the Data

  • Data for Iruma 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).