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

Guilford Threshold Days by Year (USC00173417)

13 fixed thresholds counted per year at Guilford (USC00173417): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Guilford Thresholds

  • Guilford: days with 10 mm (0.39 in) or more of precipitation in 32 years, most in 1983 with 52.
  • Guilford: days with 25 mm (0.98 in) or more of precipitation in 32 years, most in 2003 with 16.
  • Guilford: days with 10 cm (3.9 in) or more of snowfall in 29 years, most in 1987 with 13.
  • Guilford: days with 50 mm (1.97 in) or more of precipitation in 21 years, most in 1984 with 4.
  • 13 fixed thresholds have at least one qualifying day at Guilford.
5 years with a qualifying day
Days at or above 30 C (86 F) per year at Guilford Days per year at Guilford with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 20 in 2010. 051015202007: 182008: 52009: 82010: 202011: 1120072008200920102011
Days per year at Guilford with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 20 in 2010.
Days at or above 30 C (86 F) per year at Guilford
YearDaysDecade average
20071810.3
2008510.3
2009810.3
20102015.5
20111115.5
First to last qualifying date each year at Guilford For each year, a bar from the first to the last day at Guilford meeting 30 C (86 F). 2007: 10 May 2007 to 27 September 20072008: 9 June 2008 to 10 July 20082009: 29 April 2009 to 20 August 20092010: 25 May 2010 to 4 September 20102011: 9 June 2011 to 7 August 201120072008200920102011JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Guilford meeting 30 C (86 F).
First to last qualifying date each year at Guilford
YearFirst dateLast date
20072007-05-102007-09-27
20082008-06-092008-07-10
20092009-04-292009-08-20
20102010-05-252010-09-04
20112011-06-092011-08-07

Every Fixed Threshold

Fixed thresholds at Guilford
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days520201011
90 F (32.2 C): Days51020103
0 C (32 F): Ice days (max581200765
0 C (32 F): Frost days (min51942008180
-10 C (14 F): Days with min589200777
-20 C (-4 F): Days with min537200721
-30 C (-22 F): Days with min1620096
20 C (68 F): Tropical nights (min2520105
10 mm (0.39 in): Days with 10 mm or more rain3252198344
25 mm (0.98 in): Days with 25 mm or more rain321620037
50 mm (1.97 in): Days with 50 mm or more rain21419842
10 cm (3.9 in): Days with 10 cm or more snowfall291319873
25 cm (9.8 in): Days with 25 cm or more snowfall17520071

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 2007.

Download the Data

  • Data for Guilford 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).