Princeton A Weather Records (CA001126510)

Record envelope, standing records and threshold days for Princeton A (CA001126510), British Columbia, Canada, with 89 years of record.

Key Facts for Princeton A

Princeton A (CA001126510) is a weather station in British Columbia, Canada at 49.47 latitude and -120.52 longitude, 702 m (2,303 ft) above sea level.
The station reports from 1936 to 2024, 89 years of record.
1,464 records set at Princeton A still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Princeton A set a daily record snowfall of 12.8 cm (5.0 in) on 29 December 1983.

About the Station

Location: British Columbia, Canada, 49.47 latitude, -120.52 longitude.
Elevation: 702 m (2,303 ft).
Period of record: 1936 to 2024, 89 years.
Eligible elements: tmax, tmin, prcp, snow.

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 Princeton A. 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 Princeton A, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	13.3 C (55.9 F)	-41.1 C (-42.0 F)	n/a	n/a
Feb	12.8 C (55.0 F)	-33.9 C (-29.0 F)	n/a	n/a
Mar	22.8 C (73.0 F)	-33.3 C (-27.9 F)	n/a	n/a
Apr	30.6 C (87.1 F)	-11.1 C (12.0 F)	n/a	n/a
May	36.3 C (97.3 F)	-8.3 C (17.1 F)	n/a	n/a
Jun	36.7 C (98.1 F)	-2.2 C (28.0 F)	n/a	n/a
Jul	41.7 C (107.1 F)	0.0 C (32.0 F)	n/a	n/a
Aug	37.8 C (100.0 F)	-0.8 C (30.6 F)	n/a	n/a
Sep	35.0 C (95.0 F)	-6.7 C (19.9 F)	n/a	n/a
Oct	30.2 C (86.4 F)	-16.7 C (1.9 F)	n/a	n/a
Nov	21.1 C (70.0 F)	-26.1 C (-15.0 F)	n/a	n/a
Dec	12.2 C (54.0 F)	-42.8 C (-45.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Princeton A still stand. 1955 holds the most, with 61.

Standing records at Princeton A by the year they were set
Year set	Standing records
1936	4
1937	36
1938	29
1939	52
1940	40
1941	33
1942	31
1943	33
1944	24
1945	34
1946	16
1947	34
1948	19
1949	45
1950	32
1951	36
1952	23
1953	30
1954	37
1955	61
1956	36
1957	20
1958	41
1959	23
1960	26
1961	30
1962	30
1963	31
1964	24
1965	33
1966	23
1967	23
1968	32
1969	27
1970	24
1971	38
1972	35
1973	26
1974	13
1975	34
1976	23
1977	23
1978	23
1979	22
1980	30
1981	39
1982	30
1983	56

All-Time Record Progression

3 new records

3 all-time records were set at Princeton A between 29 December 1968 and 30 December 1968. Each dot is a new record.

When Princeton A set new all-time records
Date	Kind	Detail
1968-12-29	Record low maximum temperature	Record low maximum temperature -30.6 C (-23.1 F)
1968-12-29	Record low minimum temperature	Record low minimum temperature -42.2 C (-44.0 F)
1968-12-30	Record low minimum temperature	Record low minimum temperature -42.8 C (-45.0 F)

Wettest Day of Each Month

Oct: 42.4 mm (1.7 in)

The wettest day on record for each calendar month at Princeton A. The most was 42.4 mm (1.7 in) on 24 October 1945.

Record daily precipitation for each month at Princeton A
Month	Record daily precipitation (mm)	Date
Jan	30.5 mm (1.2 in)	15 January 1974
Feb	28.2 mm (1.1 in)	1 February 1947
Mar	35.6 mm (1.4 in)	5 March 1972
Apr	25.4 mm (1.0 in)	29 April 1969
May	34.3 mm (1.4 in)	19 May 1957
Jun	30.5 mm (1.2 in)	8 June 1959
Jul	36.8 mm (1.4 in)	8 July 1962
Aug	29.7 mm (1.2 in)	13 August 1948
Sep	22.4 mm (0.9 in)	4 September 1938
Oct	42.4 mm (1.7 in)	24 October 1945
Nov	32.3 mm (1.3 in)	17 November 1946
Dec	41.4 mm (1.6 in)	27 December 1942

Period of Record Coverage

1936 to 1983

48 years of record at Princeton A, 1936 to 1983. 2 years have data for under 90 percent of days and are left out of rankings: 1936, 1937.

Days with data per year at Princeton A
Year	Days with data	Share of year	Complete
1936	47	13%	No
1937	324	89%	No
1938	353	97%	Yes
1939	365	100%	Yes
1940	366	100%	Yes
1941	365	100%	Yes
1942	365	100%	Yes
1943	365	100%	Yes
1944	366	100%	Yes
1945	364	100%	Yes
1946	365	100%	Yes
1947	365	100%	Yes
1948	360	98%	Yes
1949	365	100%	Yes
1950	365	100%	Yes
1951	365	100%	Yes
1952	366	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	365	100%	Yes
1956	366	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	365	100%	Yes
1960	366	100%	Yes
1961	365	100%	Yes
1962	365	100%	Yes
1963	365	100%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	364	100%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	365	100%	Yes
1982	365	100%	Yes
1983	364	100%	Yes

Latest Records

Latest records at Princeton A
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
29 December 1983	Princeton A, CA	daily snowfall	12.8 cm (5.0 in)	5.2 cm (2.0 in)	5 years	15 of 100 (Routine)
29 December 1983	Princeton A, CA	daily rain	11.0 mm (0.4 in)	3.4 mm (0.13 in)	5 years	12 of 100 (Routine)
24 December 1983	Princeton A, CA	daily low min	-35.9 C (-32.6 F)	11.5 C (20.7 F)	34 years	32 of 100 (Routine)
24 December 1983	Princeton A, CA	daily low max	-17.0 C (1.4 F)	3.7 C (6.7 F)	12 years	14 of 100 (Routine)
23 December 1983	Princeton A, CA	daily low min	-35.0 C (-31.0 F)	13.3 C (23.9 F)	38 years	36 of 100 (Notable)
23 December 1983	Princeton A, CA	daily low max	-22.0 C (-7.6 F)	9.8 C (17.6 F)	45 years	35 of 100 (Notable)
22 December 1983	Princeton A, CA	daily low max	-23.2 C (-9.8 F)	8.8 C (15.8 F)	12 years	23 of 100 (Routine)
22 December 1983	Princeton A, CA	daily low min	-35.3 C (-31.5 F)	8.1 C (14.6 F)	12 years	19 of 100 (Routine)
21 December 1983	Princeton A, CA	daily low max	-22.2 C (-8.0 F)	9.4 C (16.9 F)	16 years	26 of 100 (Routine)
21 December 1983	Princeton A, CA	daily low min	-33.2 C (-27.8 F)	11.0 C (19.8 F)	16 years	25 of 100 (Routine)
20 December 1983	Princeton A, CA	daily low max	-15.4 C (4.3 F)	1.0 C (1.8 F)	32 years	14 of 100 (Routine)
20 December 1983	Princeton A, CA	daily low min	-26.7 C (-16.1 F)	0.6 C (1.1 F)	32 years	13 of 100 (Routine)
28 November 1983	Princeton A, CA	daily high min	-1.0 C (30.2 F)	0.7 C (1.3 F)	33 years	15 of 100 (Routine)
17 November 1983	Princeton A, CA	daily high min	0.9 C (33.6 F)	0.3 C (0.5 F)	17 years	9 of 100 (Routine)
17 November 1983	Princeton A, CA	daily high max	10.5 C (50.9 F)	0.5 C (0.9 F)	6 years	7 of 100 (Routine)
16 November 1983	Princeton A, CA	daily high max	11.7 C (53.1 F)	2.3 C (4.1 F)	44 years	21 of 100 (Routine)
16 November 1983	Princeton A, CA	daily high min	2.1 C (35.8 F)	0.4 C (0.7 F)	28 years	12 of 100 (Routine)
3 November 1983	Princeton A, CA	daily high min	5.1 C (41.2 F)	1.2 C (2.2 F)	8 years	8 of 100 (Routine)
26 October 1983	Princeton A, CA	daily high max	19.4 C (66.9 F)	0.5 C (0.9 F)	44 years	17 of 100 (Routine)
14 October 1983	Princeton A, CA	daily low max	5.6 C (42.1 F)	1.6 C (2.9 F)	14 years	11 of 100 (Routine)

Climate Trend

47 complete years, 1937 to 1983

One stripe for each of 47 complete years at Princeton A, 1937 to 1983. Blue stripes are years cooler than the station's own mean of 5.8 C (42.4 F); red stripes are warmer. The coolest year was 1955, at 3.7 C (38.7 F), and the warmest was 1958, at 7.5 C (45.6 F). The strongest colour marks a difference of 2.1 C (3.8 F).

Annual mean temperature at Princeton A as warming stripes, 1937 to 1983
Year	Annual mean temperature	Difference from the station mean
1937	4.8 C	-0.96 C
1938	6.2 C	+0.39 C
1939	6.9 C	+1.14 C
1940	7.2 C	+1.35 C
1941	6.9 C	+1.14 C
1942	5.9 C	+0.09 C
1943	4.9 C	-0.89 C
1944	5.7 C	-0.11 C
1945	5.7 C	-0.08 C
1946	5.6 C	-0.18 C
1947	6.3 C	+0.48 C
1948	5.0 C	-0.85 C
1949	4.9 C	-0.93 C
1950	4.5 C	-1.34 C
1951	4.7 C	-1.09 C
1952	5.7 C	-0.15 C
1953	6.9 C	+1.07 C
1954	5.2 C	-0.65 C
1955	3.7 C	-2.09 C
1956	5.3 C	-0.49 C
1957	5.4 C	-0.41 C
1958	7.5 C	+1.74 C
1959	5.4 C	-0.45 C
1960	5.7 C	-0.15 C
1961	6.1 C	+0.31 C
1962	5.7 C	-0.13 C
1963	6.2 C	+0.38 C
1964	5.0 C	-0.81 C
1965	6.0 C	+0.21 C
1966	6.1 C	+0.32 C
1967	6.9 C	+1.14 C
1968	5.8 C	-0.05 C
1969	5.9 C	+0.07 C
1970	5.8 C	+0.03 C
1971	5.6 C	-0.18 C
1972	5.4 C	-0.40 C
1973	6.2 C	+0.35 C
1974	6.7 C	+0.92 C
1975	5.5 C	-0.28 C
1976	6.1 C	+0.25 C
1977	6.0 C	+0.17 C
1978	5.3 C	-0.48 C
1979	6.0 C	+0.16 C
1980	5.9 C	+0.14 C
1981	7.0 C	+1.19 C
1982	5.4 C	-0.36 C
1983	6.4 C	+0.62 C

The fitted trend in annual mean temperature here over 1937 to 1983 is 0.1 C (-0.1 to 0.2) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.2 to 0.4) per decade. The slope is a straight line fitted to 47 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Princeton A
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.1 C (-0.1 to 0.2) per decade	0.1 F (-0.2 to 0.4) per decade	1937 to 1983	47	Not clearly different from zero
Mean daily maximum	-0.03 C (-0.23 to 0.18) per decade	-0.05 F (-0.42 to 0.32) per decade	1937 to 1983	47	Not clearly different from zero
Mean daily minimum	0.16 C (-0.01 to 0.32) per decade	0.28 F (-0.01 to 0.58) per decade	1937 to 1983	47	Not clearly different from zero

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

1936 to 1983

Yearly extremes at Princeton A: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	41.7 C (107.1 F)	1941	36.3 C (97.3 F)	48
Coldest night (TNn)	-42.8 C (-45.0 F)	1968	-30.0 C (-22.0 F)	48
Wettest day (Rx1day)	42.4 mm (1.7 in)	1945	22.6 mm (0.9 in)	48
Wettest five days (Rx5day)	67.8 mm (2.7 in)	1975	37.1 mm (1.5 in)	48
Longest dry spell (CDD)	53 days	1939	31 days	48

Hottest day (TXx)

The hottest day of the year at Princeton A, 1936 to 1983. The record is 41.7 C (107.1 F) in 1941, marked on the chart; the median year is 36.3 C (97.3 F).

Hottest day (TXx) at Princeton A by year
Year	Hottest day (TXx)
1936	15.6 C (60.1 F)
1937	37.8 C (100.0 F)
1938	38.3 C (100.9 F)
1939	40.6 C (105.1 F)
1940	37.2 C (99.0 F)
1941	41.7 C (107.1 F)
1942	38.9 C (102.0 F)
1943	33.9 C (93.0 F)
1944	36.7 C (98.1 F)
1945	35.6 C (96.1 F)
1946	36.7 C (98.1 F)
1947	33.3 C (91.9 F)
1948	33.3 C (91.9 F)
1949	35.0 C (95.0 F)
1950	34.4 C (93.9 F)
1951	34.4 C (93.9 F)
1952	36.7 C (98.1 F)
1953	35.0 C (95.0 F)
1954	33.3 C (91.9 F)
1955	35.6 C (96.1 F)
1956	36.7 C (98.1 F)
1957	32.2 C (90.0 F)
1958	35.6 C (96.1 F)
1959	37.2 C (99.0 F)
1960	38.9 C (102.0 F)
1961	37.8 C (100.0 F)
1962	34.4 C (93.9 F)
1963	32.8 C (91.0 F)
1964	33.9 C (93.0 F)
1965	36.7 C (98.1 F)
1966	36.7 C (98.1 F)
1967	37.2 C (99.0 F)
1968	37.2 C (99.0 F)
1969	35.0 C (95.0 F)
1970	36.1 C (97.0 F)
1971	38.3 C (100.9 F)
1972	36.7 C (98.1 F)
1973	35.6 C (96.1 F)
1974	36.1 C (97.0 F)
1975	38.3 C (100.9 F)
1976	33.9 C (93.0 F)
1977	37.2 C (99.0 F)
1978	36.2 C (97.2 F)
1979	37.9 C (100.2 F)
1980	35.3 C (95.5 F)
1981	37.3 C (99.1 F)
1982	35.6 C (96.1 F)
1983	36.3 C (97.3 F)

Coldest night (TNn)

The coldest night of the year at Princeton A, 1936 to 1983. The record is -42.8 C (-45.0 F) in 1968, marked on the chart; the median year is -30.0 C (-22.0 F).

Coldest night (TNn) at Princeton A by year
Year	Coldest night (TNn)
1936	-21.7 C (-7.1 F)
1937	-33.3 C (-27.9 F)
1938	-22.8 C (-9.0 F)
1939	-28.3 C (-18.9 F)
1940	-22.8 C (-9.0 F)
1941	-24.4 C (-11.9 F)
1942	-26.7 C (-16.1 F)
1943	-38.3 C (-36.9 F)
1944	-23.9 C (-11.0 F)
1945	-22.2 C (-8.0 F)
1946	-30.0 C (-22.0 F)
1947	-30.0 C (-22.0 F)
1948	-26.1 C (-15.0 F)
1949	-30.0 C (-22.0 F)
1950	-41.1 C (-42.0 F)
1951	-36.1 C (-33.0 F)
1952	-31.7 C (-25.1 F)
1953	-16.7 C (1.9 F)
1954	-32.2 C (-26.0 F)
1955	-33.3 C (-27.9 F)
1956	-33.9 C (-29.0 F)
1957	-35.6 C (-32.1 F)
1958	-25.0 C (-13.0 F)
1959	-33.9 C (-29.0 F)
1960	-23.9 C (-11.0 F)
1961	-21.1 C (-6.0 F)
1962	-34.4 C (-29.9 F)
1963	-29.4 C (-20.9 F)
1964	-33.9 C (-29.0 F)
1965	-23.9 C (-11.0 F)
1966	-27.2 C (-17.0 F)
1967	-22.2 C (-8.0 F)
1968	-42.8 C (-45.0 F)
1969	-37.2 C (-35.0 F)
1970	-27.2 C (-17.0 F)
1971	-35.0 C (-31.0 F)
1972	-32.8 C (-27.0 F)
1973	-30.0 C (-22.0 F)
1974	-31.1 C (-24.0 F)
1975	-31.1 C (-24.0 F)
1976	-25.6 C (-14.1 F)
1977	-22.7 C (-8.9 F)
1978	-36.0 C (-32.8 F)
1979	-32.5 C (-26.5 F)
1980	-31.4 C (-24.5 F)
1981	-21.7 C (-7.1 F)
1982	-31.9 C (-25.4 F)
1983	-35.9 C (-32.6 F)

Wettest day (Rx1day)

The wettest day of the year at Princeton A, 1936 to 1983. The record is 42.4 mm (1.7 in) in 1945, marked on the chart; the median year is 22.6 mm (0.9 in).

Wettest day (Rx1day) at Princeton A by year
Year	Wettest day (Rx1day)
1936	28.7 mm (1.1 in)
1937	27.2 mm (1.1 in)
1938	22.4 mm (0.9 in)
1939	16.0 mm (0.6 in)
1940	15.2 mm (0.6 in)
1941	17.8 mm (0.7 in)
1942	41.4 mm (1.6 in)
1943	17.3 mm (0.7 in)
1944	24.6 mm (1.0 in)
1945	42.4 mm (1.7 in)
1946	32.3 mm (1.3 in)
1947	31.2 mm (1.2 in)
1948	29.7 mm (1.2 in)
1949	32.0 mm (1.3 in)
1950	20.1 mm (0.8 in)
1951	25.9 mm (1.0 in)
1952	20.6 mm (0.8 in)
1953	22.6 mm (0.9 in)
1954	15.0 mm (0.6 in)
1955	35.1 mm (1.4 in)
1956	14.0 mm (0.6 in)
1957	34.3 mm (1.4 in)
1958	29.5 mm (1.2 in)
1959	30.5 mm (1.2 in)
1960	17.0 mm (0.7 in)
1961	18.3 mm (0.7 in)
1962	36.8 mm (1.4 in)
1963	27.2 mm (1.1 in)
1964	24.1 mm (0.9 in)
1965	17.8 mm (0.7 in)
1966	17.0 mm (0.7 in)
1967	22.6 mm (0.9 in)
1968	24.6 mm (1.0 in)
1969	25.4 mm (1.0 in)
1970	26.2 mm (1.0 in)
1971	19.3 mm (0.8 in)
1972	35.6 mm (1.4 in)
1973	17.5 mm (0.7 in)
1974	30.5 mm (1.2 in)
1975	27.7 mm (1.1 in)
1976	13.7 mm (0.5 in)
1977	16.6 mm (0.7 in)
1978	17.0 mm (0.7 in)
1979	19.2 mm (0.8 in)
1980	18.0 mm (0.7 in)
1981	22.6 mm (0.9 in)
1982	21.8 mm (0.9 in)
1983	19.8 mm (0.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Princeton A, 1936 to 1983. The record is 67.8 mm (2.7 in) in 1975, marked on the chart; the median year is 37.1 mm (1.5 in).

Wettest five days (Rx5day) at Princeton A by year
Year	Wettest five days (Rx5day)
1936	29.0 mm (1.1 in)
1937	56.2 mm (2.2 in)
1938	36.3 mm (1.4 in)
1939	30.2 mm (1.2 in)
1940	22.1 mm (0.9 in)
1941	28.6 mm (1.1 in)
1942	67.7 mm (2.7 in)
1943	29.3 mm (1.2 in)
1944	42.8 mm (1.7 in)
1945	56.3 mm (2.2 in)
1946	50.6 mm (2.0 in)
1947	37.6 mm (1.5 in)
1948	46.0 mm (1.8 in)
1949	48.8 mm (1.9 in)
1950	49.1 mm (1.9 in)
1951	53.8 mm (2.1 in)
1952	24.2 mm (1.0 in)
1953	59.2 mm (2.3 in)
1954	37.0 mm (1.5 in)
1955	50.0 mm (2.0 in)
1956	31.5 mm (1.2 in)
1957	51.8 mm (2.0 in)
1958	41.2 mm (1.6 in)
1959	34.1 mm (1.3 in)
1960	29.8 mm (1.2 in)
1961	28.3 mm (1.1 in)
1962	47.5 mm (1.9 in)
1963	44.0 mm (1.7 in)
1964	36.6 mm (1.4 in)
1965	24.2 mm (1.0 in)
1966	25.7 mm (1.0 in)
1967	38.1 mm (1.5 in)
1968	29.0 mm (1.1 in)
1969	36.6 mm (1.4 in)
1970	33.3 mm (1.3 in)
1971	34.7 mm (1.4 in)
1972	54.9 mm (2.2 in)
1973	26.2 mm (1.0 in)
1974	58.7 mm (2.3 in)
1975	67.8 mm (2.7 in)
1976	34.3 mm (1.4 in)
1977	37.2 mm (1.5 in)
1978	36.2 mm (1.4 in)
1979	38.6 mm (1.5 in)
1980	33.4 mm (1.3 in)
1981	39.6 mm (1.6 in)
1982	38.8 mm (1.5 in)
1983	36.4 mm (1.4 in)

Longest dry spell (CDD)

The longest dry spell of the year at Princeton A, 1936 to 1983. The record is 53 days in 1939, marked on the chart; the median year is 31 days.

Longest dry spell (CDD) at Princeton A by year
Year	Longest dry spell (CDD)
1936	3 days
1937	25 days
1938	40 days
1939	53 days
1940	34 days
1941	20 days
1942	22 days
1943	32 days
1944	20 days
1945	31 days
1946	27 days
1947	24 days
1948	34 days
1949	28 days
1950	35 days
1951	35 days
1952	45 days
1953	29 days
1954	26 days
1955	30 days
1956	31 days
1957	45 days
1958	34 days
1959	24 days
1960	44 days
1961	18 days
1962	32 days
1963	33 days
1964	32 days
1965	27 days
1966	23 days
1967	28 days
1968	26 days
1969	29 days
1970	31 days
1971	42 days
1972	28 days
1973	36 days
1974	27 days
1975	36 days
1976	35 days
1977	22 days
1978	25 days
1979	34 days
1980	20 days
1981	28 days
1982	36 days
1983	32 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

47 years with a frost

Across 47 years with a frost, the median last spring frost at Princeton A falls on 31 May and the median first autumn frost on 11 September, which leaves a median of 107 days between them.

Fitted over all years, the growing season changes by +3.8 days per decade at this station.

Frost dates and growing season at Princeton A
Measure	Median, all years	Earliest period	Recent period (1954 to 1983)	Recent against earliest	Fitted trend
Last spring frost	31 May	n/a	30 May	n/a	-1.3 days per decade
First autumn frost	11 September	n/a	14 September	n/a	+2.5 days per decade
Growing days	107 days	n/a	109 days	n/a	+3.8 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.

Rainfall Return Levels

47 years, 1937 to 1983

A day with at least 22.9 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 48.3 mm (1.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Princeton A: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	22.9 mm (0.9 in)
5 years	29.7 mm (1.2 in)
10 years	34.2 mm (1.3 in)
25 years	39.9 mm (1.6 in)
50 years	44.1 mm (1.7 in)	Longer than the 47 years of record
100 years	48.3 mm (1.9 in)	Longer than the 47 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 47 years of values from 1937 to 1983.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 42.4 mm (1.7 in) in 1945; 41.4 mm (1.6 in) in 1942; 36.8 mm (1.4 in) in 1962.

Station Changes

1 suspected

One change was suspected in the annual mean temperature of Princeton A, at 1969. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 1969 ran 0.3 C (0.5 F) higher than in the years before (likely change).

Suspected changes in the annual mean temperature at Princeton A, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
1969	+0.3	+0.5	likely	5

Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.

Download the Data

Data for Princeton A standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Princeton A 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).