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Built 2026-10-19 (19 October 2026)

Helper-Carbon Plt Threshold Days by Year (USC00423836)

5 fixed thresholds counted per year at Helper-Carbon Plt (USC00423836): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Helper-Carbon Plt Thresholds

  • Helper-Carbon Plt: days with 10 mm (0.39 in) or more of precipitation in 15 years, most in 1989 with 16.
  • Helper-Carbon Plt: days with 25 mm (0.98 in) or more of precipitation in 13 years, most in 1981 with 3.
  • Helper-Carbon Plt: days with 10 cm (3.9 in) or more of snowfall in 8 years, most in 1983 with 5.
  • Helper-Carbon Plt: days with 25 cm (9.8 in) or more of snowfall in 2 years, most in 1983 with 1.
  • 5 fixed thresholds have at least one qualifying day at Helper-Carbon Plt.
15 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Helper-Carbon Plt Days per year at Helper-Carbon Plt with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 16 in 1989. 051015201981: 81983: 141984: 81986: 141987: 121988: 71989: 161991: 111992: 141994: 111996: 141997: 111998: 81999: 112000: 1519811984198719891992199619982000
Days per year at Helper-Carbon Plt with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 16 in 1989.
Days with 10 mm (0.39 in) or more of precipitation per year at Helper-Carbon Plt
YearDaysDecade average
1981811.3
19831411.3
1984811.3
19861411.3
19871211.3
1988711.3
19891611.3
19911111.4
19921411.4
19941111.4
19961411.4
19971111.4
1998811.4
19991111.4
20001515
First to last qualifying date each year at Helper-Carbon Plt For each year, a bar from the first to the last day at Helper-Carbon Plt meeting 10 mm (0.39 in). 1981: 27 March 1981 to 16 October 19811983: 24 January 1983 to 3 December 19831984: 1 April 1984 to 17 October 19841986: 31 January 1986 to 2 October 19861987: 15 March 1987 to 22 December 19871988: 17 January 1988 to 12 September 19881989: 12 January 1989 to 26 October 19891991: 1 March 1991 to 27 October 19911992: 11 February 1992 to 28 December 19921994: 11 February 1994 to 18 November 19941996: 16 January 1996 to 11 December 19961997: 13 January 1997 to 27 November 19971998: 8 February 1998 to 8 November 19981999: 26 January 1999 to 21 December 19992000: 18 January 2000 to 31 October 200019811984198719891992199619982000JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Helper-Carbon Plt meeting 10 mm (0.39 in).
First to last qualifying date each year at Helper-Carbon Plt
YearFirst dateLast date
19811981-03-271981-10-16
19831983-01-241983-12-03
19841984-04-011984-10-17
19861986-01-311986-10-02
19871987-03-151987-12-22
19881988-01-171988-09-12
19891989-01-121989-10-26
19911991-03-011991-10-27
19921992-02-111992-12-28
19941994-02-111994-11-18
19961996-01-161996-12-11
19971997-01-131997-11-27
19981998-02-081998-11-08
19991999-01-261999-12-21
20002000-01-182000-10-31

Every Fixed Threshold

Fixed thresholds at Helper-Carbon Plt
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain1516198915
25 mm (0.98 in): Days with 25 mm or more rain13319811
50 mm (1.97 in): Days with 50 mm or more rain1119991
10 cm (3.9 in): Days with 10 cm or more snowfall8519833
25 cm (9.8 in): Days with 25 cm or more snowfall2119831

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1981.

Download the Data

  • Data for Helper-Carbon Plt 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).