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Built 2026-10-19 (19 October 2026)

Riverview Observatory Threshold Days by Year (ASN00066131)

14 fixed thresholds counted per year at Riverview Observatory (ASN00066131): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Riverview Observatory Thresholds

  • Riverview Observatory: days with 10 mm (0.39 in) or more of precipitation in 90 years, most in 1950 with 55.
  • Riverview Observatory: days with 25 mm (0.98 in) or more of precipitation in 90 years, most in 1955 with 24.
  • Riverview Observatory: days with 50 mm (1.97 in) or more of precipitation in 89 years, most in 1913 with 9.
  • Riverview Observatory: days with 100 mm (3.94 in) or more of precipitation in 36 years, most in 1956 with 3.
  • 14 fixed thresholds have at least one qualifying day at Riverview Observatory.
20 years with a qualifying day
Days at or above 30 C (86 F) per year at Riverview Observatory Days per year at Riverview Observatory with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 38 in 1998. 0102030401964: 361965: 281966: 251967: 221968: 231969: 271970: 231971: 181994: 241995: 171996: 171997: 231998: 381999: 152000: 292001: 232002: 272003: 162004: 372005: 311964196619681970199419961998200020022004
Days per year at Riverview Observatory with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 38 in 1998.
Days at or above 30 C (86 F) per year at Riverview Observatory
YearDaysDecade average
19643626.8
19652826.8
19662526.8
19672226.8
19682326.8
19692726.8
19702320.5
19711820.5
19942422.3
19951722.3
19961722.3
19972322.3
19983822.3
19991522.3
20002927.2
20012327.2
20022727.2
20031627.2
20043727.2
20053127.2
First to last qualifying date each year at Riverview Observatory For each year, a bar from the first to the last day at Riverview Observatory meeting 30 C (86 F). 1964: 3 January 1964 to 28 December 19641965: 10 February 1965 to 31 December 19651966: 11 January 1966 to 26 December 19661967: 9 January 1967 to 30 December 19671968: 1 January 1968 to 9 December 19681969: 3 January 1969 to 20 December 19691970: 10 January 1970 to 23 December 19701971: 9 January 1971 to 30 December 19711994: 2 January 1994 to 28 December 19941995: 6 January 1995 to 18 December 19951996: 20 January 1996 to 26 December 19961997: 6 January 1997 to 26 December 19971998: 2 January 1998 to 20 December 19981999: 3 January 1999 to 3 December 19992000: 4 January 2000 to 27 December 20002001: 3 January 2001 to 25 December 20012002: 1 January 2002 to 22 December 20022003: 18 January 2003 to 31 December 20032004: 1 January 2004 to 27 December 20042005: 1 January 2005 to 31 December 20051964196719701995199820012004JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Riverview Observatory meeting 30 C (86 F).
First to last qualifying date each year at Riverview Observatory
YearFirst dateLast date
19641964-01-031964-12-28
19651965-02-101965-12-31
19661966-01-111966-12-26
19671967-01-091967-12-30
19681968-01-011968-12-09
19691969-01-031969-12-20
19701970-01-101970-12-23
19711971-01-091971-12-30
19941994-01-021994-12-28
19951995-01-061995-12-18
19961996-01-201996-12-26
19971997-01-061997-12-26
19981998-01-021998-12-20
19991999-01-031999-12-03
20002000-01-042000-12-27
20012001-01-032001-12-25
20022002-01-012002-12-22
20032003-01-182003-12-31
20042004-01-012004-12-27
20052005-01-012005-12-31

Every Fixed Threshold

Fixed thresholds at Riverview Observatory
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2038199831
35 C (95 F): Days191420042
40 C (104 F): Days7220032
90 F (32.2 C): Days2026199815
100 F (37.8 C): Days14820041
110 F (43.3 C): Days2119941
0 C (32 F): Frost days (min2119681
20 C (68 F): Tropical nights (min2145199836
25 C (77 F): Days with min2119941
10 mm (0.39 in): Days with 10 mm or more rain9055195028
25 mm (0.98 in): Days with 25 mm or more rain9024195511
50 mm (1.97 in): Days with 50 mm or more rain89919134
100 mm (3.94 in): Days with 100 mm or more rain36319561
200 mm (7.87 in): Days with 200 mm or more rain2119111

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1964.

Download the Data

  • Data for Riverview Observatory 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 (2026-10-17).