Daily records
Page built 2026-10-19
Data as of 2026-10-17
Search
Built 2026-10-19 (19 October 2026)

Reston Threshold Days by Year (CA005012400)

16 fixed thresholds counted per year at Reston (CA005012400): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Reston Thresholds

  • Reston: days with a maximum temperature at or above 30 C (86 F) in 10 years, most in 1961 with 49.
  • Reston: days with a maximum temperature at or above 90 F (32.2 C) in 10 years, most in 1961 with 31.
  • Reston: days with a maximum temperature at or below 0 C (32 F) in 10 years, most in 1960 with 117.
  • Reston: nights with a minimum temperature at or below 0 C (32 F) in 10 years, most in 1956 with 205.
  • 16 fixed thresholds have at least one qualifying day at Reston.
10 years with a qualifying day
Days at or above 30 C (86 F) per year at Reston Days per year at Reston with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 49 in 1961. 02040601953: 211956: 81957: 161958: 211959: 191960: 301961: 491962: 61963: 211964: 161953195619571958195919601961196219631964
Days per year at Reston with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 49 in 1961.
Days at or above 30 C (86 F) per year at Reston
YearDaysDecade average
19532117
1956817
19571617
19582117
19591917
19603024.4
19614924.4
1962624.4
19632124.4
19641624.4
First to last qualifying date each year at Reston For each year, a bar from the first to the last day at Reston meeting 30 C (86 F). 1953: 6 May 1953 to 31 August 19531956: 21 May 1956 to 26 September 19561957: 9 July 1957 to 2 October 19571958: 12 May 1958 to 1 September 19581959: 5 June 1959 to 27 August 19591960: 12 May 1960 to 20 September 19601961: 29 May 1961 to 31 August 19611962: 27 June 1962 to 21 August 19621963: 30 May 1963 to 4 October 19631964: 20 May 1964 to 13 October 196419531957195919611963JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Reston meeting 30 C (86 F).
First to last qualifying date each year at Reston
YearFirst dateLast date
19531953-05-061953-08-31
19561956-05-211956-09-26
19571957-07-091957-10-02
19581958-05-121958-09-01
19591959-06-051959-08-27
19601960-05-121960-09-20
19611961-05-291961-08-31
19621962-06-271962-08-21
19631963-05-301963-10-04
19641964-05-201964-10-13

Every Fixed Threshold

Fixed thresholds at Reston
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days1049196116
35 C (95 F): Days61119611
90 F (32.2 C): Days103119612
100 F (37.8 C): Days1219612
0 C (32 F): Ice days (max101171960114
0 C (32 F): Frost days (min102051956194
-10 C (14 F): Days with min101261956116
-20 C (-4 F): Days with min1068195662
-30 C (-22 F): Days with min1021195613
-40 C (-40 F): Days with min1319623
20 C (68 F): Tropical nights (min4219642
10 mm (0.39 in): Days with 10 mm or more rain819196219
25 mm (0.98 in): Days with 25 mm or more rain5619595
50 mm (1.97 in): Days with 50 mm or more rain2119561
10 cm (3.9 in): Days with 10 cm or more snowfall8419593
25 cm (9.8 in): Days with 25 cm or more snowfall2119591

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1953.

Download the Data

  • Data for Reston 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).