Arnprior Grandon Threshold Days by Year (CA006100345)

14 fixed thresholds counted per year at Arnprior Grandon (CA006100345): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Arnprior Grandon Thresholds

Arnprior Grandon: days with 10 mm (0.39 in) or more of precipitation in 21 years, most in 1966 with 31.
Arnprior Grandon: days with 10 cm (3.9 in) or more of snowfall in 20 years, most in 1971 with 11.
Arnprior Grandon: days with a maximum temperature at or above 30 C (86 F) in 18 years, most in 1983 with 32.
Arnprior Grandon: days with a maximum temperature at or below 0 C (32 F) in 18 years, most in 1971 with 104.
14 fixed thresholds have at least one qualifying day at Arnprior Grandon.

Days at or above 30 C (86 F)

18 years with a qualifying day

Days per year at Arnprior Grandon with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 32 in 1983.

Days at or above 30 C (86 F) per year at Arnprior Grandon
Year	Days	Decade average
1965	13	11.4
1966	16	11.4
1967	4	11.4
1968	11	11.4
1969	13	11.4
1970	21	15.7
1971	10	15.7
1973	16	15.7
1974	9	15.7
1975	27	15.7
1976	11	15.7
1977	15	15.7
1978	16	15.7
1979	16	15.7
1980	6	14
1981	7	14
1982	11	14
1983	32	14

For each year, a bar from the first to the last day at Arnprior Grandon meeting 30 C (86 F).

First to last qualifying date each year at Arnprior Grandon
Year	First date	Last date
1965	1965-05-26	1965-09-22
1966	1966-06-23	1966-08-18
1967	1967-06-02	1967-06-15
1968	1968-06-05	1968-08-24
1969	1969-06-12	1969-08-31
1970	1970-06-09	1970-08-15
1971	1971-05-19	1971-08-19
1973	1973-07-03	1973-09-04
1974	1974-06-10	1974-08-23
1975	1975-05-20	1975-08-25
1976	1976-04-18	1976-08-22
1977	1977-05-17	1977-09-01
1978	1978-05-25	1978-08-15
1979	1979-05-09	1979-09-01
1980	1980-06-24	1980-08-25
1981	1981-06-15	1981-07-11
1982	1982-07-06	1982-08-16
1983	1983-06-12	1983-09-20

Every Fixed Threshold

Fixed thresholds at Arnprior Grandon
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	18	32	1983	32
35 C (95 F): Days	2	2	1975	1
90 F (32.2 C): Days	16	13	1975	9
0 C (32 F): Ice days (max	18	104	1971	87
0 C (32 F): Frost days (min	18	181	1965	175
-10 C (14 F): Days with min	18	96	1978	75
-20 C (-4 F): Days with min	18	41	1968	26
-30 C (-22 F): Days with min	15	11	1971	2
20 C (68 F): Tropical nights (min	18	10	1970	8
10 mm (0.39 in): Days with 10 mm or more rain	21	31	1966	30
25 mm (0.98 in): Days with 25 mm or more rain	18	8	1973	1
50 mm (1.97 in): Days with 50 mm or more rain	3	1	1967	1
10 cm (3.9 in): Days with 10 cm or more snowfall	20	11	1971	3
25 cm (9.8 in): Days with 25 cm or more snowfall	6	2	1970	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1965.

Download the Data

Data for Arnprior Grandon 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Arnprior Grandon Threshold Days by Year (CA006100345)

Key Facts for Arnprior Grandon Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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