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

Waltham Threshold Days by Year (CA007038880)

12 fixed thresholds counted per year at Waltham (CA007038880): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Waltham Thresholds

  • Waltham: days with 10 mm (0.39 in) or more of precipitation in 28 years, most in 1972 with 42.
  • Waltham: days with 25 mm (0.98 in) or more of precipitation in 28 years, most in 1956 with 10.
  • Waltham: days with 10 cm (3.9 in) or more of snowfall in 28 years, most in 1971 with 10.
  • Waltham: days with 25 cm (9.8 in) or more of snowfall in 7 years, most in 1966 with 1.
  • 12 fixed thresholds have at least one qualifying day at Waltham.
28 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Waltham Days per year at Waltham with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 42 in 1972. 02040601954: 331955: 211956: 341957: 291958: 221959: 281960: 251961: 271964: 171965: 321966: 291967: 331968: 271969: 281970: 231971: 261972: 421973: 241974: 311975: 221976: 231977: 261978: 221979: 311980: 341981: 271982: 261983: 401954195719601965196819711974197719801983
Days per year at Waltham with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 42 in 1972.
Days with 10 mm (0.39 in) or more of precipitation per year at Waltham
YearDaysDecade average
19543327.8
19552127.8
19563427.8
19572927.8
19582227.8
19592827.8
19602527.3
19612727.3
19641727.3
19653227.3
19662927.3
19673327.3
19682727.3
19692827.3
19702327
19712627
19724227
19732427
19743127
19752227
19762327
19772627
19782227
19793127
19803431.8
19812731.8
19822631.8
19834031.8
First to last qualifying date each year at Waltham For each year, a bar from the first to the last day at Waltham meeting 10 mm (0.39 in). 1954: 20 January 1954 to 23 December 19541955: 15 January 1955 to 23 November 19551956: 9 January 1956 to 28 November 19561957: 3 January 1957 to 26 December 19571958: 24 February 1958 to 18 December 19581959: 1 January 1959 to 7 December 19591960: 2 January 1960 to 31 December 19601961: 18 February 1961 to 12 December 19611964: 6 February 1964 to 24 December 19641965: 19 January 1965 to 24 December 19651966: 30 January 1966 to 17 December 19661967: 27 January 1967 to 25 December 19671968: 1 February 1968 to 28 December 19681969: 24 January 1969 to 11 December 19691970: 28 January 1970 to 23 December 19701971: 21 January 1971 to 30 December 19711972: 2 January 1972 to 31 December 19721973: 2 February 1973 to 20 December 19731974: 18 February 1974 to 16 December 19741975: 25 January 1975 to 26 December 19751976: 13 January 1976 to 20 December 19761977: 3 January 1977 to 21 December 19771978: 26 January 1978 to 31 December 19781979: 13 January 1979 to 22 December 19791980: 11 January 1980 to 12 December 19801981: 6 January 1981 to 20 November 19811982: 23 January 1982 to 24 December 19821983: 7 January 1983 to 28 December 19831954195819641968197219761980JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Waltham meeting 10 mm (0.39 in).
First to last qualifying date each year at Waltham
YearFirst dateLast date
19541954-01-201954-12-23
19551955-01-151955-11-23
19561956-01-091956-11-28
19571957-01-031957-12-26
19581958-02-241958-12-18
19591959-01-011959-12-07
19601960-01-021960-12-31
19611961-02-181961-12-12
19641964-02-061964-12-24
19651965-01-191965-12-24
19661966-01-301966-12-17
19671967-01-271967-12-25
19681968-02-011968-12-28
19691969-01-241969-12-11
19701970-01-281970-12-23
19711971-01-211971-12-30
19721972-01-021972-12-31
19731973-02-021973-12-20
19741974-02-181974-12-16
19751975-01-251975-12-26
19761976-01-131976-12-20
19771977-01-031977-12-21
19781978-01-261978-12-31
19791979-01-131979-12-22
19801980-01-111980-12-12
19811981-01-061981-11-20
19821982-01-231982-12-24
19831983-01-071983-12-28

Every Fixed Threshold

Fixed thresholds at Waltham
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days1619746
90 F (32.2 C): Days1319743
0 C (32 F): Ice days (max169197469
0 C (32 F): Frost days (min11361974136
-10 C (14 F): Days with min154197454
-20 C (-4 F): Days with min125197425
20 C (68 F): Tropical nights (min1119741
10 mm (0.39 in): Days with 10 mm or more rain2842197240
25 mm (0.98 in): Days with 25 mm or more rain281019565
50 mm (1.97 in): Days with 50 mm or more rain6119551
10 cm (3.9 in): Days with 10 cm or more snowfall281019716
25 cm (9.8 in): Days with 25 cm or more snowfall7119661

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1974.

Download the Data

  • Data for Waltham 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).