Bowmanville Mostert Weather Records (CA006150830)

Record envelope, standing records and threshold days for Bowmanville Mostert (CA006150830), Ontario, Canada, with 37 years of record.

Key Facts for Bowmanville Mostert

Bowmanville Mostert (CA006150830) is a weather station in Ontario, Canada at 43.92 latitude and -78.67 longitude, 99 m (325 ft) above sea level.
The station reports from 1966 to 2002, 37 years of record.
1,464 records set at Bowmanville Mostert still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Ontario, Canada, 43.92 latitude, -78.67 longitude.
Elevation: 99 m (325 ft).
Period of record: 1966 to 2002, 37 years.
Eligible elements: none yet.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Bowmanville Mostert. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Bowmanville Mostert, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	12.2 C (54.0 F)	-34.0 C (-29.2 F)	n/a	n/a
Feb	11.0 C (51.8 F)	-30.0 C (-22.0 F)	n/a	n/a
Mar	20.0 C (68.0 F)	-22.8 C (-9.0 F)	n/a	n/a
Apr	26.0 C (78.8 F)	-14.4 C (6.1 F)	n/a	n/a
May	30.0 C (86.0 F)	-5.0 C (23.0 F)	n/a	n/a
Jun	31.7 C (89.1 F)	-1.0 C (30.2 F)	n/a	n/a
Jul	35.0 C (95.0 F)	2.8 C (37.0 F)	n/a	n/a
Aug	32.2 C (90.0 F)	-0.5 C (31.1 F)	n/a	n/a
Sep	32.2 C (90.0 F)	-3.3 C (26.1 F)	n/a	n/a
Oct	25.6 C (78.1 F)	-8.3 C (17.1 F)	n/a	n/a
Nov	21.1 C (70.0 F)	-17.8 C (0.0 F)	n/a	n/a
Dec	17.5 C (63.5 F)	-34.5 C (-30.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Bowmanville Mostert still stand. 1973 holds the most, with 103.

Standing records at Bowmanville Mostert by the year they were set
Year set	Standing records
1966	45
1967	24
1968	89
1969	65
1970	102
1971	98
1972	77
1973	103
1974	73
1975	96
1976	102
1977	82
1978	69
1979	93
1980	90
1981	88
1982	79
1983	89

Wettest Day of Each Month

Jul: 51.1 mm (2.0 in)

The wettest day on record for each calendar month at Bowmanville Mostert. The most was 51.1 mm (2.0 in) on 2 July 1974.

Record daily precipitation for each month at Bowmanville Mostert
Month	Record daily precipitation (mm)	Date
Jan	32.0 mm (1.3 in)	24 January 1979
Feb	28.0 mm (1.1 in)	2 February 1983
Mar	47.6 mm (1.9 in)	20 March 1980
Apr	37.8 mm (1.5 in)	18 April 1975
May	36.2 mm (1.4 in)	19 May 1983
Jun	50.6 mm (2.0 in)	10 June 1982
Jul	51.1 mm (2.0 in)	2 July 1974
Aug	42.7 mm (1.7 in)	16 August 1969
Sep	45.6 mm (1.8 in)	5 September 1981
Oct	36.6 mm (1.4 in)	25 October 1980
Nov	42.9 mm (1.7 in)	7 November 1977
Dec	41.1 mm (1.6 in)	12 December 1972

Period of Record Coverage

1966 to 1983

18 years of record at Bowmanville Mostert, 1966 to 1983. 2 years have data for under 90 percent of days and are left out of rankings: 1966, 1967.

Days with data per year at Bowmanville Mostert
Year	Days with data	Share of year	Complete
1966	200	55%	No
1967	91	25%	No
1968	366	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	334	92%	Yes
1972	358	98%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	335	92%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	365	100%	Yes
1981	364	100%	Yes
1982	361	99%	Yes
1983	365	100%	Yes

Latest Records

No records were set at this station in the latest data.

Climate Trend

14 complete years, 1968 to 1983

One stripe for each of 14 complete years at Bowmanville Mostert, 1968 to 1983. Blue stripes are years cooler than the station's own mean of 6.6 C (43.9 F); red stripes are warmer. The coolest year was 1978, at 5.6 C (42.0 F), and the warmest was 1973, at 7.7 C (45.9 F). The strongest colour marks a difference of 1.2 C (2.2 F).

Annual mean temperature at Bowmanville Mostert as warming stripes, 1968 to 1983
Year	Annual mean temperature	Difference from the station mean
1968	6.4 C	-0.21 C
1969	6.6 C	+0.03 C
1970	6.4 C	-0.18 C
1972	5.9 C	-0.70 C
1973	7.7 C	+1.11 C
1974	6.3 C	-0.26 C
1975	7.2 C	+0.62 C
1977	6.7 C	+0.09 C
1978	5.6 C	-1.02 C
1979	6.4 C	-0.20 C
1980	5.9 C	-0.66 C
1981	6.9 C	+0.33 C
1982	6.6 C	-0.02 C
1983	7.7 C	+1.07 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1966 to 1983

Yearly extremes at Bowmanville Mostert: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	35.0 C (95.0 F)	1966	31.6 C (88.9 F)	18
Coldest night (TNn)	-34.5 C (-30.1 F)	1980	-26.4 C (-15.5 F)	18
Wettest day (Rx1day)	51.1 mm (2.0 in)	1974	39.5 mm (1.6 in)	18
Wettest five days (Rx5day)	99.6 mm (3.9 in)	1981	60.9 mm (2.4 in)	18
Longest dry spell (CDD)	24 days	1969	16 days	18

Hottest day (TXx)

The hottest day of the year at Bowmanville Mostert, 1966 to 1983. The record is 35.0 C (95.0 F) in 1966, marked on the chart; the median year is 31.6 C (88.9 F).

Hottest day (TXx) at Bowmanville Mostert by year
Year	Hottest day (TXx)
1966	35.0 C (95.0 F)
1967	13.3 C (55.9 F)
1968	31.7 C (89.1 F)
1969	30.6 C (87.1 F)
1970	30.0 C (86.0 F)
1971	31.7 C (89.1 F)
1972	29.4 C (84.9 F)
1973	32.2 C (90.0 F)
1974	32.2 C (90.0 F)
1975	32.2 C (90.0 F)
1976	31.1 C (88.0 F)
1977	33.9 C (93.0 F)
1978	31.5 C (88.7 F)
1979	29.5 C (85.1 F)
1980	29.5 C (85.1 F)
1981	33.0 C (91.4 F)
1982	29.0 C (84.2 F)
1983	35.0 C (95.0 F)

Coldest night (TNn)

The coldest night of the year at Bowmanville Mostert, 1966 to 1983. The record is -34.5 C (-30.1 F) in 1980, marked on the chart; the median year is -26.4 C (-15.5 F).

Coldest night (TNn) at Bowmanville Mostert by year
Year	Coldest night (TNn)
1966	-18.3 C (-0.9 F)
1967	-19.4 C (-2.9 F)
1968	-27.2 C (-17.0 F)
1969	-21.7 C (-7.1 F)
1970	-28.3 C (-18.9 F)
1971	-30.0 C (-22.0 F)
1972	-25.6 C (-14.1 F)
1973	-23.3 C (-9.9 F)
1974	-24.4 C (-11.9 F)
1975	-23.9 C (-11.0 F)
1976	-31.1 C (-24.0 F)
1977	-31.7 C (-25.1 F)
1978	-25.0 C (-13.0 F)
1979	-30.0 C (-22.0 F)
1980	-34.5 C (-30.1 F)
1981	-34.0 C (-29.2 F)
1982	-29.0 C (-20.2 F)
1983	-22.0 C (-7.6 F)

Wettest day (Rx1day)

The wettest day of the year at Bowmanville Mostert, 1966 to 1983. The record is 51.1 mm (2.0 in) in 1974, marked on the chart; the median year is 39.5 mm (1.6 in).

Wettest day (Rx1day) at Bowmanville Mostert by year
Year	Wettest day (Rx1day)
1966	38.9 mm (1.5 in)
1967	25.7 mm (1.0 in)
1968	39.4 mm (1.6 in)
1969	42.7 mm (1.7 in)
1970	44.7 mm (1.8 in)
1971	39.6 mm (1.6 in)
1972	41.1 mm (1.6 in)
1973	21.3 mm (0.8 in)
1974	51.1 mm (2.0 in)
1975	37.8 mm (1.5 in)
1976	34.3 mm (1.4 in)
1977	42.9 mm (1.7 in)
1978	27.6 mm (1.1 in)
1979	35.2 mm (1.4 in)
1980	47.6 mm (1.9 in)
1981	45.6 mm (1.8 in)
1982	50.6 mm (2.0 in)
1983	36.2 mm (1.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at Bowmanville Mostert, 1966 to 1983. The record is 99.6 mm (3.9 in) in 1981, marked on the chart; the median year is 60.9 mm (2.4 in).

Wettest five days (Rx5day) at Bowmanville Mostert by year
Year	Wettest five days (Rx5day)
1966	80.1 mm (3.2 in)
1967	33.8 mm (1.3 in)
1968	47.0 mm (1.9 in)
1969	71.4 mm (2.8 in)
1970	60.6 mm (2.4 in)
1971	59.4 mm (2.3 in)
1972	61.2 mm (2.4 in)
1973	63.7 mm (2.5 in)
1974	73.7 mm (2.9 in)
1975	42.5 mm (1.7 in)
1976	47.5 mm (1.9 in)
1977	62.7 mm (2.5 in)
1978	55.2 mm (2.2 in)
1979	58.7 mm (2.3 in)
1980	67.8 mm (2.7 in)
1981	99.6 mm (3.9 in)
1982	65.8 mm (2.6 in)
1983	55.2 mm (2.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Bowmanville Mostert, 1966 to 1983. The record is 24 days in 1969, marked on the chart; the median year is 16 days.

Longest dry spell (CDD) at Bowmanville Mostert by year
Year	Longest dry spell (CDD)
1966	21 days
1967	9 days
1968	21 days
1969	24 days
1970	16 days
1971	12 days
1972	14 days
1973	17 days
1974	10 days
1975	13 days
1976	14 days
1977	22 days
1978	14 days
1979	24 days
1980	18 days
1981	19 days
1982	16 days
1983	12 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Download the Data

Data for Bowmanville Mostert standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Bowmanville Mostert 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-16. Last revised 16 October 2026 (2026-10-16).