Daily records
Page built 2026-10-16
Data as of 2025-12-31
Search
Built 2026-10-16 (16 October 2026)

Headquarters Threshold Days by Year

17 fixed thresholds counted per year at Headquarters (USC00104150): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Headquarters Thresholds

  • Headquarters: days with 10 cm (3.9 in) or more of snowfall in 38 years, most in 1996 with 23.
  • Headquarters: days with a maximum temperature at or above 30 C (86 F) in 35 years, most in 1961 with 50.
  • Headquarters: days with a maximum temperature at or below 0 C (32 F) in 35 years, most in 2009 with 45.
  • Headquarters: nights with a minimum temperature at or below 0 C (32 F) in 35 years, most in 1971 with 248.
  • 17 fixed thresholds have at least one qualifying day at Headquarters.
35 years with a qualifying day
Days at or above 30 C (86 F) per year at Headquarters Days per year at Headquarters with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 50 in 1961. 02040601960: 301961: 501962: 211963: 301964: 191965: 231966: 431967: 441968: 201969: 271970: 361971: 381972: 231973: 331974: 281975: 181976: 131977: 301981: 291983: 171994: 311995: 51996: 251997: 111998: 341999: 162000: 162001: 232002: 112003: 362005: 262006: 342007: 302008: 152009: 20196019641968197219761994199820022007
Days per year at Headquarters with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 50 in 1961.
Days at or above 30 C (86 F) per year at Headquarters
YearDaysDecade average
19603030.7
19615030.7
19622130.7
19633030.7
19641930.7
19652330.7
19664330.7
19674430.7
19682030.7
19692730.7
19703627.4
19713827.4
19722327.4
19733327.4
19742827.4
19751827.4
19761327.4
19773027.4
19812923
19831723
19943120.3
1995520.3
19962520.3
19971120.3
19983420.3
19991620.3
20001623.4
20012323.4
20021123.4
20033623.4
20052623.4
20063423.4
20073023.4
20081523.4
20092023.4
First to last qualifying date each year at Headquarters For each year, a bar from the first to the last day at Headquarters meeting 30 C (86 F). 1960: 25 June 1960 to 12 September 19601961: 26 May 1961 to 25 August 19611962: 25 June 1962 to 27 September 19621963: 16 June 1963 to 29 September 19631964: 16 June 1964 to 18 August 19641965: 11 June 1965 to 19 August 19651966: 5 May 1966 to 24 September 19661967: 20 June 1967 to 29 September 19671968: 3 July 1968 to 10 September 19681969: 5 June 1969 to 8 September 19691970: 3 June 1970 to 1 September 19701971: 22 June 1971 to 11 September 19711972: 30 May 1972 to 30 August 19721973: 15 May 1973 to 6 September 19731974: 12 June 1974 to 31 August 19741975: 3 July 1975 to 28 August 19751976: 29 June 1976 to 2 September 19761977: 25 April 1977 to 21 August 19771981: 26 June 1981 to 19 September 19811983: 26 May 1983 to 31 August 19831994: 21 June 1994 to 25 September 19941995: 7 July 1995 to 3 September 19951996: 8 June 1996 to 13 September 19961997: 6 July 1997 to 2 September 19971998: 3 July 1998 to 16 September 19981999: 16 June 1999 to 30 August 19992000: 13 July 2000 to 15 September 20002001: 24 May 2001 to 26 September 20012002: 27 June 2002 to 15 September 20022003: 25 May 2003 to 7 September 20032005: 22 June 2005 to 29 August 20052006: 16 May 2006 to 6 September 20062007: 3 June 2007 to 4 September 20072008: 18 May 2008 to 19 August 20082009: 5 July 2009 to 24 September 20091960196519701975199419992005JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Headquarters meeting 30 C (86 F).
First to last qualifying date each year at Headquarters
YearFirst dateLast date
19601960-06-251960-09-12
19611961-05-261961-08-25
19621962-06-251962-09-27
19631963-06-161963-09-29
19641964-06-161964-08-18
19651965-06-111965-08-19
19661966-05-051966-09-24
19671967-06-201967-09-29
19681968-07-031968-09-10
19691969-06-051969-09-08
19701970-06-031970-09-01
19711971-06-221971-09-11
19721972-05-301972-08-30
19731973-05-151973-09-06
19741974-06-121974-08-31
19751975-07-031975-08-28
19761976-06-291976-09-02
19771977-04-251977-08-21
19811981-06-261981-09-19
19831983-05-261983-08-31
19941994-06-211994-09-25
19951995-07-071995-09-03
19961996-06-081996-09-13
19971997-07-061997-09-02
19981998-07-031998-09-16
19991999-06-161999-08-30
20002000-07-132000-09-15
20012001-05-242001-09-26
20022002-06-272002-09-15
20032003-05-252003-09-07
20052005-06-222005-08-29
20062006-05-162006-09-06
20072007-06-032007-09-04
20082008-05-182008-08-19
20092009-07-052009-09-24

Every Fixed Threshold

Fixed thresholds at Headquarters
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3550196120
35 C (95 F): Days291219612
40 C (104 F): Days1219612
90 F (32.2 C): Days343019713
100 F (37.8 C): Days5519611
0 C (32 F): Ice days (max3545200945
0 C (32 F): Frost days (min352481971223
-10 C (14 F): Days with min3557197548
-20 C (-4 F): Days with min281819728
-30 C (-22 F): Days with min4219641
20 C (68 F): Tropical nights (min1119751
10 mm (0.39 in): Days with 10 mm or more rain3551197131
25 mm (0.98 in): Days with 25 mm or more rain35919953
50 mm (1.97 in): Days with 50 mm or more rain9219991
10 cm (3.9 in): Days with 10 cm or more snowfall382319967
25 cm (9.8 in): Days with 25 cm or more snowfall19419711
50 cm (19.7 in): Days with 50 cm or more snowfall1119681

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1960.

Download the Data

  • Data for Headquarters 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 2026-10-14 (14 October 2026). Threshold counts are computed by this site.

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