Grand Forks Rayfield Weather Records (CA001133275)

Record envelope, standing records and threshold days for Grand Forks Rayfield (CA001133275), British Columbia, Canada, with 82 years of record.

Key Facts for Grand Forks Rayfield

Grand Forks Rayfield (CA001133275) is a weather station in British Columbia, Canada at 49.02 latitude and -118.47 longitude, 523 m (1,716 ft) above sea level.
The station reports from 1909 to 1990, 82 years of record.
1,464 records set at Grand Forks Rayfield still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: British Columbia, Canada, 49.02 latitude, -118.47 longitude.
Elevation: 523 m (1,716 ft).
Period of record: 1909 to 1990, 82 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 Grand Forks Rayfield. 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 Grand Forks Rayfield, 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)	-36.1 C (-33.0 F)	n/a	n/a
Feb	13.3 C (55.9 F)	-34.4 C (-29.9 F)	n/a	n/a
Mar	23.3 C (73.9 F)	-18.3 C (-0.9 F)	n/a	n/a
Apr	32.2 C (90.0 F)	-16.7 C (1.9 F)	n/a	n/a
May	38.3 C (100.9 F)	-2.2 C (28.0 F)	n/a	n/a
Jun	38.9 C (102.0 F)	-1.1 C (30.0 F)	n/a	n/a
Jul	42.8 C (109.0 F)	3.3 C (37.9 F)	n/a	n/a
Aug	40.0 C (104.0 F)	1.7 C (35.1 F)	n/a	n/a
Sep	38.3 C (100.9 F)	-6.1 C (21.0 F)	n/a	n/a
Oct	28.3 C (82.9 F)	-12.8 C (9.0 F)	n/a	n/a
Nov	15.0 C (59.0 F)	-21.7 C (-7.1 F)	n/a	n/a
Dec	11.7 C (53.1 F)	-35.6 C (-32.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Grand Forks Rayfield still stand. 1924 holds the most, with 79.

Standing records at Grand Forks Rayfield by the year they were set
Year set	Standing records
1911	42
1912	66
1913	58
1914	59
1915	44
1916	75
1917	58
1918	54
1919	76
1920	28
1921	48
1922	73
1923	58
1924	79
1925	50
1926	47
1927	38
1928	36
1929	53
1930	57
1931	47
1932	38
1933	42
1934	43
1935	50
1936	66
1937	36
1938	38
1939	5

Wettest Day of Each Month

Jun: 51.6 mm (2.0 in)

The wettest day on record for each calendar month at Grand Forks Rayfield. The most was 51.6 mm (2.0 in) on 15 June 1929.

Record daily precipitation for each month at Grand Forks Rayfield
Month	Record daily precipitation (mm)	Date
Jan	22.9 mm (0.9 in)	22 January 1935
Feb	32.3 mm (1.3 in)	20 February 1937
Mar	21.1 mm (0.8 in)	28 March 1934
Apr	26.2 mm (1.0 in)	29 April 1915
May	25.4 mm (1.0 in)	31 May 1936
Jun	51.6 mm (2.0 in)	15 June 1929
Jul	19.6 mm (0.8 in)	3 July 1915
Aug	30.0 mm (1.2 in)	11 August 1918
Sep	40.1 mm (1.6 in)	11 September 1927
Oct	26.9 mm (1.1 in)	2 October 1938
Nov	17.5 mm (0.7 in)	5 November 1913
Dec	25.9 mm (1.0 in)	1 December 1927

Period of Record Coverage

1911 to 1939

29 years of record at Grand Forks Rayfield, 1911 to 1939. 2 years have data for under 90 percent of days and are left out of rankings: 1911, 1939.

Days with data per year at Grand Forks Rayfield
Year	Days with data	Share of year	Complete
1911	293	80%	No
1912	366	100%	Yes
1913	365	100%	Yes
1914	365	100%	Yes
1915	365	100%	Yes
1916	366	100%	Yes
1917	363	99%	Yes
1918	365	100%	Yes
1919	365	100%	Yes
1920	366	100%	Yes
1921	365	100%	Yes
1922	364	100%	Yes
1923	364	100%	Yes
1924	365	100%	Yes
1925	365	100%	Yes
1926	365	100%	Yes
1927	365	100%	Yes
1928	366	100%	Yes
1929	360	99%	Yes
1930	365	100%	Yes
1931	365	100%	Yes
1932	366	100%	Yes
1933	365	100%	Yes
1934	365	100%	Yes
1935	365	100%	Yes
1936	366	100%	Yes
1937	365	100%	Yes
1938	364	100%	Yes
1939	90	25%	No

Latest Records

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

Climate Trend

27 complete years, 1912 to 1938

One stripe for each of 27 complete years at Grand Forks Rayfield, 1912 to 1938. Blue stripes are years cooler than the station's own mean of 7.5 C (45.5 F); red stripes are warmer. The coolest year was 1916, at 5.6 C (42.1 F), and the warmest was 1923, at 9.4 C (48.9 F). The strongest colour marks a difference of 1.9 C (3.4 F).

Annual mean temperature at Grand Forks Rayfield as warming stripes, 1912 to 1938
Year	Annual mean temperature	Difference from the station mean
1912	6.6 C	-0.88 C
1913	6.3 C	-1.25 C
1914	7.9 C	+0.41 C
1915	7.9 C	+0.43 C
1916	5.6 C	-1.88 C
1917	7.0 C	-0.46 C
1918	7.7 C	+0.23 C
1919	6.7 C	-0.83 C
1920	7.5 C	+0.03 C
1921	7.2 C	-0.28 C
1922	7.9 C	+0.38 C
1923	9.4 C	+1.88 C
1924	7.7 C	+0.17 C
1925	8.9 C	+1.44 C
1926	8.4 C	+0.90 C
1927	6.5 C	-0.99 C
1928	7.4 C	-0.09 C
1929	6.5 C	-1.05 C
1930	6.9 C	-0.61 C
1931	8.0 C	+0.50 C
1932	7.1 C	-0.37 C
1933	7.3 C	-0.17 C
1934	9.2 C	+1.70 C
1935	7.5 C	-0.05 C
1936	7.2 C	-0.29 C
1937	7.4 C	-0.13 C
1938	8.8 C	+1.32 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

1909 to 1939

Yearly extremes at Grand Forks Rayfield: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	42.8 C (109.0 F)	1924	38.3 C (100.9 F)	29
Coldest night (TNn)	-36.1 C (-33.0 F)	1924	-28.3 C (-18.9 F)	29
Wettest day (Rx1day)	51.6 mm (2.0 in)	1929	21.1 mm (0.8 in)	31
Wettest five days (Rx5day)	59.8 mm (2.4 in)	1929	35.1 mm (1.4 in)	31
Longest dry spell (CDD)	54 days	1914	28 days	31

Hottest day (TXx)

The hottest day of the year at Grand Forks Rayfield, 1909 to 1939. The record is 42.8 C (109.0 F) in 1924, marked on the chart; the median year is 38.3 C (100.9 F).

Hottest day (TXx) at Grand Forks Rayfield by year
Year	Hottest day (TXx)
1909	n/a
1910	n/a
1911	37.8 C (100.0 F)
1912	36.1 C (97.0 F)
1913	36.1 C (97.0 F)
1914	38.3 C (100.9 F)
1915	36.1 C (97.0 F)
1916	36.1 C (97.0 F)
1917	37.8 C (100.0 F)
1918	40.0 C (104.0 F)
1919	38.9 C (102.0 F)
1920	37.2 C (99.0 F)
1921	35.0 C (95.0 F)
1922	40.0 C (104.0 F)
1923	38.9 C (102.0 F)
1924	42.8 C (109.0 F)
1925	38.9 C (102.0 F)
1926	39.4 C (102.9 F)
1927	38.9 C (102.0 F)
1928	40.0 C (104.0 F)
1929	40.6 C (105.1 F)
1930	37.8 C (100.0 F)
1931	37.8 C (100.0 F)
1932	37.2 C (99.0 F)
1933	38.9 C (102.0 F)
1934	42.2 C (108.0 F)
1935	38.3 C (100.9 F)
1936	38.9 C (102.0 F)
1937	37.2 C (99.0 F)
1938	40.6 C (105.1 F)
1939	19.4 C (66.9 F)

Coldest night (TNn)

The coldest night of the year at Grand Forks Rayfield, 1909 to 1939. The record is -36.1 C (-33.0 F) in 1924, marked on the chart; the median year is -28.3 C (-18.9 F).

Coldest night (TNn) at Grand Forks Rayfield by year
Year	Coldest night (TNn)
1909	n/a
1910	n/a
1911	-21.7 C (-7.1 F)
1912	-29.4 C (-20.9 F)
1913	-26.1 C (-15.0 F)
1914	-23.9 C (-11.0 F)
1915	-23.9 C (-11.0 F)
1916	-30.0 C (-22.0 F)
1917	-28.3 C (-18.9 F)
1918	-25.0 C (-13.0 F)
1919	-28.9 C (-20.0 F)
1920	-21.7 C (-7.1 F)
1921	-21.1 C (-6.0 F)
1922	-30.6 C (-23.1 F)
1923	-29.4 C (-20.9 F)
1924	-36.1 C (-33.0 F)
1925	-24.4 C (-11.9 F)
1926	-25.6 C (-14.1 F)
1927	-35.6 C (-32.1 F)
1928	-25.0 C (-13.0 F)
1929	-32.2 C (-26.0 F)
1930	-32.8 C (-27.0 F)
1931	-22.8 C (-9.0 F)
1932	-29.4 C (-20.9 F)
1933	-31.1 C (-24.0 F)
1934	-17.8 C (0.0 F)
1935	-33.9 C (-29.0 F)
1936	-34.4 C (-29.9 F)
1937	-32.2 C (-26.0 F)
1938	-20.6 C (-5.1 F)
1939	-25.6 C (-14.1 F)

Wettest day (Rx1day)

The wettest day of the year at Grand Forks Rayfield, 1909 to 1939. The record is 51.6 mm (2.0 in) in 1929, marked on the chart; the median year is 21.1 mm (0.8 in).

Wettest day (Rx1day) at Grand Forks Rayfield by year
Year	Wettest day (Rx1day)
1909	13.7 mm (0.5 in)
1910	15.0 mm (0.6 in)
1911	30.0 mm (1.2 in)
1912	21.1 mm (0.8 in)
1913	23.6 mm (0.9 in)
1914	21.3 mm (0.8 in)
1915	26.2 mm (1.0 in)
1916	17.5 mm (0.7 in)
1917	36.1 mm (1.4 in)
1918	30.0 mm (1.2 in)
1919	13.0 mm (0.5 in)
1920	12.7 mm (0.5 in)
1921	15.2 mm (0.6 in)
1922	23.1 mm (0.9 in)
1923	17.0 mm (0.7 in)
1924	19.1 mm (0.8 in)
1925	10.9 mm (0.4 in)
1926	19.1 mm (0.8 in)
1927	40.1 mm (1.6 in)
1928	17.0 mm (0.7 in)
1929	51.6 mm (2.0 in)
1930	23.1 mm (0.9 in)
1931	19.8 mm (0.8 in)
1932	15.2 mm (0.6 in)
1933	16.5 mm (0.6 in)
1934	21.1 mm (0.8 in)
1935	22.9 mm (0.9 in)
1936	25.9 mm (1.0 in)
1937	32.3 mm (1.3 in)
1938	30.0 mm (1.2 in)
1939	9.9 mm (0.39 in)

Wettest five days (Rx5day)

The wettest five days of the year at Grand Forks Rayfield, 1909 to 1939. The record is 59.8 mm (2.4 in) in 1929, marked on the chart; the median year is 35.1 mm (1.4 in).

Wettest five days (Rx5day) at Grand Forks Rayfield by year
Year	Wettest five days (Rx5day)
1909	25.4 mm (1.0 in)
1910	24.3 mm (1.0 in)
1911	57.2 mm (2.3 in)
1912	37.6 mm (1.5 in)
1913	32.7 mm (1.3 in)
1914	29.2 mm (1.1 in)
1915	38.7 mm (1.5 in)
1916	36.9 mm (1.5 in)
1917	47.6 mm (1.9 in)
1918	37.1 mm (1.5 in)
1919	35.1 mm (1.4 in)
1920	31.3 mm (1.2 in)
1921	31.0 mm (1.2 in)
1922	40.1 mm (1.6 in)
1923	40.9 mm (1.6 in)
1924	34.0 mm (1.3 in)
1925	24.2 mm (1.0 in)
1926	39.3 mm (1.5 in)
1927	56.6 mm (2.2 in)
1928	33.7 mm (1.3 in)
1929	59.8 mm (2.4 in)
1930	33.2 mm (1.3 in)
1931	46.5 mm (1.8 in)
1932	31.8 mm (1.3 in)
1933	31.3 mm (1.2 in)
1934	30.2 mm (1.2 in)
1935	38.2 mm (1.5 in)
1936	54.3 mm (2.1 in)
1937	35.1 mm (1.4 in)
1938	52.8 mm (2.1 in)
1939	26.2 mm (1.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at Grand Forks Rayfield, 1909 to 1939. The record is 54 days in 1914, marked on the chart; the median year is 28 days.

Longest dry spell (CDD) at Grand Forks Rayfield by year
Year	Longest dry spell (CDD)
1909	19 days
1910	45 days
1911	29 days
1912	18 days
1913	28 days
1914	54 days
1915	19 days
1916	33 days
1917	31 days
1918	21 days
1919	25 days
1920	36 days
1921	27 days
1922	48 days
1923	22 days
1924	24 days
1925	27 days
1926	33 days
1927	23 days
1928	35 days
1929	48 days
1930	25 days
1931	52 days
1932	27 days
1933	31 days
1934	38 days
1935	27 days
1936	51 days
1937	30 days
1938	23 days
1939	16 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.

Frost Dates and Growing Season

27 years with a frost

Across 27 years with a frost, the median last spring frost at Grand Forks Rayfield falls on 17 May and the median first autumn frost on 24 September, which leaves a median of 135 days between them.

Fitted over all years, the growing season changes by -1.6 days per decade at this station.

Frost dates and growing season at Grand Forks Rayfield
Measure	Median, all years	Earliest period	Recent period (1912 to 1938)	Recent against earliest	Fitted trend
Last spring frost	17 May	n/a	17 May	n/a	-0.3 days per decade
First autumn frost	24 September	n/a	24 September	n/a	-1.8 days per decade
Growing days	135 days	n/a	135 days	n/a	-1.6 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Download the Data

Data for Grand Forks Rayfield standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Grand Forks Rayfield 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). Records are computed by this site and are not official.

Data as of 2026-10-17. Last revised 17 October 2026 (2026-10-17).