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Built 2026-10-19 (19 October 2026)

South Andover Threshold Days by Year (USC00177940)

16 fixed thresholds counted per year at South Andover (USC00177940): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for South Andover Thresholds

  • South Andover: days with 10 mm (0.39 in) or more of precipitation in 19 years, most in 1954 with 44.
  • South Andover: days with 25 mm (0.98 in) or more of precipitation in 19 years, most in 1953 with 14.
  • South Andover: days with 10 cm (3.9 in) or more of snowfall in 18 years, most in 1958 with 19.
  • South Andover: days with 50 mm (1.97 in) or more of precipitation in 11 years, most in 1954 with 4.
  • 16 fixed thresholds have at least one qualifying day at South Andover.
19 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at South Andover Days per year at South Andover with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 44 in 1954. 02040601944: 331946: 331947: 331953: 391954: 441956: 301957: 251958: 431960: 371961: 301965: 241966: 271967: 311968: 441969: 461971: 341972: 411973: 431974: 371944194719541957196019651967196919721974
Days per year at South Andover with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 44 in 1954.
Days with 10 mm (0.39 in) or more of precipitation per year at South Andover
YearDaysDecade average
19443333
19463333
19473333
19533936.2
19544436.2
19563036.2
19572536.2
19584336.2
19603734.1
19613034.1
19652434.1
19662734.1
19673134.1
19684434.1
19694634.1
19713438.8
19724138.8
19734338.8
19743738.8
First to last qualifying date each year at South Andover For each year, a bar from the first to the last day at South Andover meeting 10 mm (0.39 in). 1944: 6 January 1944 to 31 December 19441946: 10 January 1946 to 29 December 19461947: 2 January 1947 to 16 December 19471953: 3 January 1953 to 14 December 19531954: 6 January 1954 to 30 December 19541956: 8 January 1956 to 29 December 19561957: 23 January 1957 to 27 December 19571958: 1 January 1958 to 6 December 19581960: 3 January 1960 to 21 December 19601961: 1 January 1961 to 28 December 19611965: 8 February 1965 to 13 December 19651966: 24 January 1966 to 29 December 19661967: 28 January 1967 to 29 December 19671968: 15 January 1968 to 28 December 19681969: 7 January 1969 to 28 December 19691971: 26 January 1971 to 16 December 19711972: 4 February 1972 to 31 December 19721973: 20 January 1973 to 27 December 19731974: 11 January 1974 to 21 November 19741944195319571961196719711974JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at South Andover meeting 10 mm (0.39 in).
First to last qualifying date each year at South Andover
YearFirst dateLast date
19441944-01-061944-12-31
19461946-01-101946-12-29
19471947-01-021947-12-16
19531953-01-031953-12-14
19541954-01-061954-12-30
19561956-01-081956-12-29
19571957-01-231957-12-27
19581958-01-011958-12-06
19601960-01-031960-12-21
19611961-01-011961-12-28
19651965-02-081965-12-13
19661966-01-241966-12-29
19671967-01-281967-12-29
19681968-01-151968-12-28
19691969-01-071969-12-28
19711971-01-261971-12-16
19721972-02-041972-12-31
19731973-01-201973-12-27
19741974-01-111974-11-21

Every Fixed Threshold

Fixed thresholds at South Andover
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days121194421
35 C (95 F): Days1419444
90 F (32.2 C): Days113194413
0 C (32 F): Ice days (max155194455
0 C (32 F): Frost days (min11651944165
-10 C (14 F): Days with min169194469
-20 C (-4 F): Days with min118194418
-30 C (-22 F): Days with min1119441
20 C (68 F): Tropical nights (min1519445
10 mm (0.39 in): Days with 10 mm or more rain1944195437
25 mm (0.98 in): Days with 25 mm or more rain191419539
50 mm (1.97 in): Days with 50 mm or more rain11419542
100 mm (3.94 in): Days with 100 mm or more rain2119661
10 cm (3.9 in): Days with 10 cm or more snowfall181919586
25 cm (9.8 in): Days with 25 cm or more snowfall11319661
50 cm (19.7 in): Days with 50 cm or more snowfall2119611

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1944.

Download the Data

  • Data for South Andover 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).