St Lawrence Threshold Days by Year (CA008403615)

10 fixed thresholds counted per year at St Lawrence (CA008403615): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for St Lawrence Thresholds

St Lawrence: days with a maximum temperature at or below 0 C (32 F) in 18 years, most in 1972 with 76.
St Lawrence: nights with a minimum temperature at or below 0 C (32 F) in 18 years, most in 1972 with 192.
St Lawrence: nights with a minimum temperature at or below -10 C (14 F) in 18 years, most in 1972 with 60.
St Lawrence: days with 10 mm (0.39 in) or more of precipitation in 18 years, most in 1983 with 74.
10 fixed thresholds have at least one qualifying day at St Lawrence.

Nights at or below 0 C (32 F)

18 years with a qualifying day

Days per year at St Lawrence with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 192 in 1972.

Nights at or below 0 C (32 F) per year at St Lawrence
Year	Days	Decade average
1966	132	152.5
1967	166	152.5
1968	171	152.5
1969	141	152.5
1970	163	168.7
1971	156	168.7
1972	192	168.7
1973	165	168.7
1974	188	168.7
1975	182	168.7
1976	168	168.7
1977	163	168.7
1978	176	168.7
1979	134	168.7
1980	153	148.3
1981	124	148.3
1982	169	148.3
1983	147	148.3

For each year, a bar from the first to the last day at St Lawrence meeting 0 C (32 F).

First to last qualifying date each year at St Lawrence
Year	First date	Last date
1966	1966-02-05	1966-12-31
1967	1967-01-01	1967-12-31
1968	1968-01-01	1968-12-31
1969	1969-01-01	1969-12-31
1970	1970-01-01	1970-12-31
1971	1971-01-01	1971-12-31
1972	1972-01-01	1972-12-31
1973	1973-01-01	1973-12-31
1974	1974-01-01	1974-12-31
1975	1975-01-01	1975-12-31
1976	1976-01-01	1976-12-31
1977	1977-01-01	1977-12-31
1978	1978-01-01	1978-12-31
1979	1979-01-01	1979-12-31
1980	1980-01-01	1980-12-31
1981	1981-01-01	1981-12-31
1982	1982-01-01	1982-12-31
1983	1983-01-01	1983-12-31

Every Fixed Threshold

Fixed thresholds at St Lawrence
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
0 C (32 F): Ice days (max	18	76	1972	42
0 C (32 F): Frost days (min	18	192	1972	147
-10 C (14 F): Days with min	18	60	1972	23
-20 C (-4 F): Days with min	4	4	1975	4
10 mm (0.39 in): Days with 10 mm or more rain	18	74	1983	74
25 mm (0.98 in): Days with 25 mm or more rain	18	20	1982	19
50 mm (1.97 in): Days with 50 mm or more rain	14	5	1975	3
10 cm (3.9 in): Days with 10 cm or more snowfall	18	11	1982	7
25 cm (9.8 in): Days with 25 cm or more snowfall	7	1	1967	1
50 cm (19.7 in): Days with 50 cm or more snowfall	2	1	1981	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1966.

Download the Data

Data for St Lawrence 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

St Lawrence Threshold Days by Year (CA008403615)

Key Facts for St Lawrence Thresholds

Nights at or below 0 C (32 F)

Every Fixed Threshold

Download the Data

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