Fairfax Weather Records (USC00392820)

Record envelope, standing records and threshold days for Fairfax (USC00392820), South Dakota, United States, with 55 years of record.

Key Facts for Fairfax

Fairfax (USC00392820) is a weather station in South Dakota, United States at 43.03 latitude and -98.88 longitude, 589 m (1,932 ft) above sea level.
The station reports from 1902 to 1956, 55 years of record.
1,464 records set at Fairfax still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Fairfax tied a daily record snowfall of 10.2 cm (4.0 in) on 29 April 1956.

About the Station

Location: South Dakota, United States, 43.03 latitude, -98.88 longitude.
Elevation: 589 m (1,932 ft).
Period of record: 1902 to 1956, 55 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.

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 Fairfax. 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 Fairfax, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	19.4 C (66.9 F)	-37.2 C (-35.0 F)	n/a	n/a
Feb	25.6 C (78.1 F)	-35.6 C (-32.1 F)	n/a	n/a
Mar	33.3 C (91.9 F)	-27.8 C (-18.0 F)	n/a	n/a
Apr	36.1 C (97.0 F)	-22.2 C (-8.0 F)	n/a	n/a
May	38.9 C (102.0 F)	-7.8 C (18.0 F)	n/a	n/a
Jun	42.2 C (108.0 F)	0.0 C (32.0 F)	n/a	n/a
Jul	45.6 C (114.1 F)	4.4 C (39.9 F)	n/a	n/a
Aug	43.9 C (111.0 F)	1.1 C (34.0 F)	n/a	n/a
Sep	43.3 C (109.9 F)	-7.8 C (18.0 F)	n/a	n/a
Oct	36.1 C (97.0 F)	-18.3 C (-0.9 F)	n/a	n/a
Nov	27.8 C (82.0 F)	-27.8 C (-18.0 F)	n/a	n/a
Dec	25.6 C (78.1 F)	-34.4 C (-29.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Fairfax still stand. 1936 holds the most, with 85.

Standing records at Fairfax by the year they were set
Year set	Standing records
1902	8
1903	9
1904	10
1905	53
1906	29
1907	17
1908	21
1909	21
1910	28
1911	18
1912	37
1913	21
1914	24
1915	32
1916	36
1917	42
1918	29
1919	36
1920	18
1921	30
1922	13
1923	18
1924	26
1925	23
1926	28
1927	33
1928	23
1929	24
1930	35
1931	41
1932	32
1933	30
1934	44
1935	33
1936	85
1937	35
1938	20
1939	33
1940	37
1941	34
1942	19
1943	22
1944	22
1945	17
1946	30
1947	25
1948	15
1949	15
1950	21
1951	31
1952	24
1953	15
1954	10
1955	28
1956	4

All-Time Record Progression

12 new records

12 all-time records were set at Fairfax between 21 July 1934 and 30 March 1949. Each dot is a new record.

When Fairfax set new all-time records
Date	Kind	Detail
1934-07-21	Record high maximum temperature	Record high maximum temperature 43.9 C (111.0 F)
1934-07-21	Record high minimum temperature	Record high minimum temperature 29.4 C (84.9 F)
1936-02-03	Record snow depth	Record snow depth 40.6 cm (16.0 in)
1936-02-07	Record snow depth	Record snow depth 48.3 cm (19.0 in)
1936-02-08	Record low maximum temperature	Record low maximum temperature -26.7 C (-16.1 F)
1936-02-12	Record snow depth	Record snow depth 58.4 cm (23.0 in)
1936-02-15	Record snow depth	Record snow depth 63.5 cm (25.0 in)
1936-02-16	Record snow depth	Record snow depth 71.1 cm (28.0 in)
1936-07-04	Record high maximum temperature	Record high maximum temperature 44.4 C (111.9 F)
1936-07-05	Record high minimum temperature	Record high minimum temperature 30.0 C (86.0 F)
1936-07-17	Record high maximum temperature	Record high maximum temperature 45.6 C (114.1 F)
1949-03-30	Record daily snowfall	Record daily snowfall 50.8 cm (20.0 in)

Wettest Day of Each Month

Jul: 148.6 mm (5.9 in)

The wettest day on record for each calendar month at Fairfax. The most was 148.6 mm (5.9 in) on 30 July 1914.

Record daily precipitation for each month at Fairfax
Month	Record daily precipitation (mm)	Date
Jan	32.3 mm (1.3 in)	27 January 1944
Feb	27.4 mm (1.1 in)	20 February 1953
Mar	50.8 mm (2.0 in)	7 March 1950
Apr	55.9 mm (2.2 in)	18 April 1920
May	99.1 mm (3.9 in)	26 May 1917
Jun	80.0 mm (3.1 in)	22 June 1925
Jul	148.6 mm (5.9 in)	30 July 1914
Aug	74.9 mm (2.9 in)	3 August 1944
Sep	64.0 mm (2.5 in)	20 September 1950
Oct	102.6 mm (4.0 in)	5 October 1946
Nov	78.7 mm (3.1 in)	12 November 1922
Dec	26.7 mm (1.1 in)	23 December 1931

Period of Record Coverage

1902 to 1956

55 years of record at Fairfax, 1902 to 1956. 10 years have data for under 90 percent of days and are left out of rankings: 1902, 1903, 1907, 1909, 1910, 1911, 1942, 1949 and others.

Days with data per year at Fairfax
Year	Days with data	Share of year	Complete
1902	85	23%	No
1903	320	88%	No
1904	359	98%	Yes
1905	356	98%	Yes
1906	360	99%	Yes
1907	259	71%	No
1908	342	93%	Yes
1909	287	79%	No
1910	138	38%	No
1911	281	77%	No
1912	365	100%	Yes
1913	364	100%	Yes
1914	365	100%	Yes
1915	333	91%	Yes
1916	358	98%	Yes
1917	340	93%	Yes
1918	335	92%	Yes
1919	363	99%	Yes
1920	366	100%	Yes
1921	360	99%	Yes
1922	362	99%	Yes
1923	358	98%	Yes
1924	365	100%	Yes
1925	358	98%	Yes
1926	364	100%	Yes
1927	363	99%	Yes
1928	366	100%	Yes
1929	365	100%	Yes
1930	364	100%	Yes
1931	335	92%	Yes
1932	366	100%	Yes
1933	363	99%	Yes
1934	364	100%	Yes
1935	363	99%	Yes
1936	364	99%	Yes
1937	365	100%	Yes
1938	362	99%	Yes
1939	365	100%	Yes
1940	365	100%	Yes
1941	362	99%	Yes
1942	304	83%	No
1943	362	99%	Yes
1944	359	98%	Yes
1945	358	98%	Yes
1946	363	99%	Yes
1947	336	92%	Yes
1948	356	97%	Yes
1949	326	89%	No
1950	337	92%	Yes
1951	355	97%	Yes
1952	366	100%	Yes
1953	357	98%	Yes
1954	304	83%	No
1955	343	94%	Yes
1956	120	33%	No

Latest Records

Latest records at Fairfax
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
29 April 1956	Fairfax, US	daily snowfall (Tie)	10.2 cm (4.0 in)	tie	39 years	4 of 100 (Routine)
29 April 1956	Fairfax, US	daily snow depth (Tie)	5.1 cm (2.0 in)	tie	39 years	4 of 100 (Routine)
28 April 1956	Fairfax, US	daily snowfall	12.7 cm (5.0 in)	7.6 cm (3.0 in)	53 years	32 of 100 (Routine)
28 April 1956	Fairfax, US	daily snow depth	7.6 cm (3.0 in)	7.6 cm (3.0 in)	53 years	20 of 100 (Routine)
28 April 1956	Fairfax, US	daily low max	-2.2 C (28.0 F)	1.6 C (2.9 F)	49 years	21 of 100 (Routine)
24 April 1956	Fairfax, US	daily low min (Tie)	-5.0 C (23.0 F)	tie	38 years	4 of 100 (Routine)
17 April 1956	Fairfax, US	daily low min	-8.3 C (17.1 F)	1.6 C (2.9 F)	49 years	22 of 100 (Routine)
12 March 1956	Fairfax, US	daily low min	-23.9 C (-11.0 F)	1.7 C (3.1 F)	6 years	8 of 100 (Routine)
11 March 1956	Fairfax, US	daily low max	-9.4 C (15.1 F)	1.1 C (2.0 F)	6 years	7 of 100 (Routine)
5 January 1956	Fairfax, US	daily high min (Tie)	-1.1 C (30.0 F)	tie	8 years	1 of 100 (Routine)
23 December 1955	Fairfax, US	daily high min	0.0 C (32.0 F)	2.2 C (4.0 F)	40 years	20 of 100 (Routine)
19 December 1955	Fairfax, US	daily low max (Tie)	-15.0 C (5.0 F)	tie	30 years	3 of 100 (Routine)
4 December 1955	Fairfax, US	daily low max (Tie)	-9.4 C (15.1 F)	tie	26 years	3 of 100 (Routine)
29 November 1955	Fairfax, US	daily low max	-9.4 C (15.1 F)	2.2 C (4.0 F)	49 years	21 of 100 (Routine)
28 November 1955	Fairfax, US	daily low max	-10.6 C (12.9 F)	2.8 C (5.0 F)	44 years	21 of 100 (Routine)
25 November 1955	Fairfax, US	daily low min	-16.1 C (3.0 F)	1.7 C (3.1 F)	24 years	15 of 100 (Routine)
17 November 1955	Fairfax, US	daily low min	-17.8 C (0.0 F)	4.5 C (8.1 F)	52 years	28 of 100 (Routine)
16 November 1955	Fairfax, US	daily low max	-6.7 C (19.9 F)	2.8 C (5.0 F)	17 years	13 of 100 (Routine)
3 November 1955	Fairfax, US	daily low min (Tie)	-13.9 C (7.0 F)	tie	18 years	2 of 100 (Routine)
18 September 1955	Fairfax, US	daily high min	21.1 C (70.0 F)	2.2 C (4.0 F)	40 years	21 of 100 (Routine)

Climate Trend

39 complete years, 1904 to 1953

One stripe for each of 39 complete years at Fairfax, 1904 to 1953. Blue stripes are years cooler than the station's own mean of 8.8 C (47.9 F); red stripes are warmer. The coolest year was 1951, at 6.3 C (43.3 F), and the warmest was 1941, at 11.2 C (52.2 F). The strongest colour marks a difference of 2.6 C (4.7 F).

Annual mean temperature at Fairfax as warming stripes, 1904 to 1953
Year	Annual mean temperature	Difference from the station mean
1904	9.0 C	+0.19 C
1905	8.9 C	+0.10 C
1906	8.4 C	-0.42 C
1912	8.4 C	-0.47 C
1913	9.5 C	+0.66 C
1914	9.2 C	+0.40 C
1916	7.5 C	-1.29 C
1917	6.3 C	-2.53 C
1918	8.5 C	-0.30 C
1919	8.1 C	-0.75 C
1920	8.8 C	-0.05 C
1921	10.4 C	+1.55 C
1922	8.6 C	-0.23 C
1923	8.7 C	-0.11 C
1924	7.1 C	-1.69 C
1925	9.0 C	+0.13 C
1926	9.4 C	+0.62 C
1927	8.0 C	-0.79 C
1928	9.2 C	+0.38 C
1929	7.2 C	-1.64 C
1930	8.6 C	-0.22 C
1932	8.4 C	-0.39 C
1933	9.7 C	+0.92 C
1934	10.3 C	+1.51 C
1935	8.4 C	-0.39 C
1936	8.2 C	-0.62 C
1937	8.2 C	-0.62 C
1938	10.3 C	+1.45 C
1939	10.6 C	+1.82 C
1940	9.4 C	+0.55 C
1941	11.2 C	+2.40 C
1943	9.7 C	+0.85 C
1944	9.0 C	+0.17 C
1945	8.7 C	-0.12 C
1946	9.5 C	+0.64 C
1948	9.1 C	+0.32 C
1951	6.3 C	-2.54 C
1952	8.9 C	+0.04 C
1953	9.4 C	+0.57 C

The fitted trend in annual mean temperature here over 1904 to 1953 is 0.1 C (-0.1 to 0.4) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.3 F (-0.2 to 0.7) per decade. The slope is a straight line fitted to 39 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Fairfax
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.1 C (-0.1 to 0.4) per decade	0.3 F (-0.2 to 0.7) per decade	1904 to 1953	39	Not clearly different from zero
Mean daily maximum	0.1 C (-0.3 to 0.4) per decade	0.1 F (-0.5 to 0.6) per decade	1904 to 1953	39	Not clearly different from zero
Mean daily minimum	0.24 C (-0.01 to 0.49) per decade	0.44 F (-0.01 to 0.88) per decade	1904 to 1953	39	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

1902 to 1956

Yearly extremes at Fairfax: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	45.6 C (114.1 F)	1936	38.9 C (102.0 F)	55
Coldest night (TNn)	-37.2 C (-35.0 F)	1912	-29.4 C (-20.9 F)	55
Wettest day (Rx1day)	148.6 mm (5.9 in)	1914	50.3 mm (2.0 in)	55
Wettest five days (Rx5day)	174.5 mm (6.9 in)	1914	76.7 mm (3.0 in)	55
Longest dry spell (CDD)	98 days	1904	37 days	55

Hottest day (TXx)

The hottest day of the year at Fairfax, 1902 to 1956. The record is 45.6 C (114.1 F) in 1936, marked on the chart; the median year is 38.9 C (102.0 F).

Hottest day (TXx) at Fairfax by year
Year	Hottest day (TXx)
1902	36.1 C (97.0 F)
1903	35.0 C (95.0 F)
1904	38.9 C (102.0 F)
1905	37.8 C (100.0 F)
1906	37.2 C (99.0 F)
1907	40.0 C (104.0 F)
1908	37.8 C (100.0 F)
1909	37.8 C (100.0 F)
1910	35.0 C (95.0 F)
1911	38.9 C (102.0 F)
1912	37.2 C (99.0 F)
1913	40.0 C (104.0 F)
1914	39.4 C (102.9 F)
1915	33.9 C (93.0 F)
1916	38.3 C (100.9 F)
1917	41.1 C (106.0 F)
1918	38.3 C (100.9 F)
1919	43.3 C (109.9 F)
1920	36.7 C (98.1 F)
1921	38.9 C (102.0 F)
1922	37.8 C (100.0 F)
1923	36.7 C (98.1 F)
1924	36.1 C (97.0 F)
1925	41.1 C (106.0 F)
1926	43.3 C (109.9 F)
1927	37.2 C (99.0 F)
1928	38.3 C (100.9 F)
1929	39.4 C (102.9 F)
1930	42.8 C (109.0 F)
1931	42.2 C (108.0 F)
1932	38.9 C (102.0 F)
1933	40.6 C (105.1 F)
1934	43.9 C (111.0 F)
1935	40.6 C (105.1 F)
1936	45.6 C (114.1 F)
1937	42.8 C (109.0 F)
1938	42.8 C (109.0 F)
1939	42.8 C (109.0 F)
1940	45.6 C (114.1 F)
1941	38.9 C (102.0 F)
1942	40.0 C (104.0 F)
1943	42.2 C (108.0 F)
1944	38.9 C (102.0 F)
1945	39.4 C (102.9 F)
1946	38.9 C (102.0 F)
1947	43.3 C (109.9 F)
1948	39.4 C (102.9 F)
1949	37.8 C (100.0 F)
1950	35.0 C (95.0 F)
1951	35.6 C (96.1 F)
1952	40.6 C (105.1 F)
1953	37.8 C (100.0 F)
1954	36.1 C (97.0 F)
1955	40.6 C (105.1 F)
1956	25.6 C (78.1 F)

Coldest night (TNn)

The coldest night of the year at Fairfax, 1902 to 1956. The record is -37.2 C (-35.0 F) in 1912, marked on the chart; the median year is -29.4 C (-20.9 F).

Coldest night (TNn) at Fairfax by year
Year	Coldest night (TNn)
1902	-27.8 C (-18.0 F)
1903	-24.4 C (-11.9 F)
1904	-29.4 C (-20.9 F)
1905	-35.6 C (-32.1 F)
1906	-27.8 C (-18.0 F)
1907	-30.0 C (-22.0 F)
1908	-25.6 C (-14.1 F)
1909	-29.4 C (-20.9 F)
1910	-25.0 C (-13.0 F)
1911	-31.1 C (-24.0 F)
1912	-37.2 C (-35.0 F)
1913	-29.4 C (-20.9 F)
1914	-31.7 C (-25.1 F)
1915	-28.9 C (-20.0 F)
1916	-36.1 C (-33.0 F)
1917	-34.4 C (-29.9 F)
1918	-33.3 C (-27.9 F)
1919	-31.7 C (-25.1 F)
1920	-29.4 C (-20.9 F)
1921	-26.1 C (-15.0 F)
1922	-28.9 C (-20.0 F)
1923	-27.8 C (-18.0 F)
1924	-35.0 C (-31.0 F)
1925	-26.1 C (-15.0 F)
1926	-25.6 C (-14.1 F)
1927	-28.9 C (-20.0 F)
1928	-28.9 C (-20.0 F)
1929	-30.0 C (-22.0 F)
1930	-32.8 C (-27.0 F)
1931	-21.7 C (-7.1 F)
1932	-30.6 C (-23.1 F)
1933	-33.9 C (-29.0 F)
1934	-28.9 C (-20.0 F)
1935	-28.3 C (-18.9 F)
1936	-33.9 C (-29.0 F)
1937	-30.0 C (-22.0 F)
1938	-26.7 C (-16.1 F)
1939	-27.2 C (-17.0 F)
1940	-31.7 C (-25.1 F)
1941	-21.7 C (-7.1 F)
1942	-30.0 C (-22.0 F)
1943	-30.0 C (-22.0 F)
1944	-30.0 C (-22.0 F)
1945	-25.6 C (-14.1 F)
1946	-27.2 C (-17.0 F)
1947	-27.2 C (-17.0 F)
1948	-30.0 C (-22.0 F)
1949	-29.4 C (-20.9 F)
1950	-30.6 C (-23.1 F)
1951	-29.4 C (-20.9 F)
1952	-25.6 C (-14.1 F)
1953	-27.8 C (-18.0 F)
1954	-27.8 C (-18.0 F)
1955	-27.2 C (-17.0 F)
1956	-26.7 C (-16.1 F)

Wettest day (Rx1day)

The wettest day of the year at Fairfax, 1902 to 1956. The record is 148.6 mm (5.9 in) in 1914, marked on the chart; the median year is 50.3 mm (2.0 in).

Wettest day (Rx1day) at Fairfax by year
Year	Wettest day (Rx1day)
1902	35.6 mm (1.4 in)
1903	76.2 mm (3.0 in)
1904	50.8 mm (2.0 in)
1905	50.8 mm (2.0 in)
1906	45.7 mm (1.8 in)
1907	48.8 mm (1.9 in)
1908	61.0 mm (2.4 in)
1909	49.5 mm (1.9 in)
1910	15.2 mm (0.6 in)
1911	84.8 mm (3.3 in)
1912	78.7 mm (3.1 in)
1913	29.7 mm (1.2 in)
1914	148.6 mm (5.9 in)
1915	64.8 mm (2.6 in)
1916	47.5 mm (1.9 in)
1917	99.1 mm (3.9 in)
1918	50.8 mm (2.0 in)
1919	31.8 mm (1.3 in)
1920	55.9 mm (2.2 in)
1921	59.9 mm (2.4 in)
1922	78.7 mm (3.1 in)
1923	39.6 mm (1.6 in)
1924	69.3 mm (2.7 in)
1925	80.0 mm (3.1 in)
1926	32.0 mm (1.3 in)
1927	50.3 mm (2.0 in)
1928	31.5 mm (1.2 in)
1929	50.8 mm (2.0 in)
1930	43.4 mm (1.7 in)
1931	36.8 mm (1.4 in)
1932	36.8 mm (1.4 in)
1933	72.1 mm (2.8 in)
1934	53.8 mm (2.1 in)
1935	41.9 mm (1.6 in)
1936	39.4 mm (1.6 in)
1937	34.3 mm (1.4 in)
1938	34.3 mm (1.4 in)
1939	57.2 mm (2.3 in)
1940	31.8 mm (1.3 in)
1941	42.7 mm (1.7 in)
1942	41.9 mm (1.6 in)
1943	52.8 mm (2.1 in)
1944	74.9 mm (2.9 in)
1945	40.6 mm (1.6 in)
1946	102.6 mm (4.0 in)
1947	39.4 mm (1.6 in)
1948	34.8 mm (1.4 in)
1949	63.5 mm (2.5 in)
1950	64.0 mm (2.5 in)
1951	55.9 mm (2.2 in)
1952	30.0 mm (1.2 in)
1953	51.8 mm (2.0 in)
1954	79.2 mm (3.1 in)
1955	49.5 mm (1.9 in)
1956	9.7 mm (0.38 in)

Wettest five days (Rx5day)

The wettest five days of the year at Fairfax, 1902 to 1956. The record is 174.5 mm (6.9 in) in 1914, marked on the chart; the median year is 76.7 mm (3.0 in).

Wettest five days (Rx5day) at Fairfax by year
Year	Wettest five days (Rx5day)
1902	43.2 mm (1.7 in)
1903	92.2 mm (3.6 in)
1904	59.4 mm (2.3 in)
1905	77.0 mm (3.0 in)
1906	67.8 mm (2.7 in)
1907	61.0 mm (2.4 in)
1908	129.6 mm (5.1 in)
1909	87.6 mm (3.4 in)
1910	16.5 mm (0.6 in)
1911	117.3 mm (4.6 in)
1912	101.6 mm (4.0 in)
1913	38.1 mm (1.5 in)
1914	174.5 mm (6.9 in)
1915	111.1 mm (4.4 in)
1916	55.1 mm (2.2 in)
1917	136.2 mm (5.4 in)
1918	58.7 mm (2.3 in)
1919	48.3 mm (1.9 in)
1920	122.4 mm (4.8 in)
1921	73.7 mm (2.9 in)
1922	79.0 mm (3.1 in)
1923	108.0 mm (4.3 in)
1924	98.0 mm (3.9 in)
1925	107.9 mm (4.2 in)
1926	76.7 mm (3.0 in)
1927	102.8 mm (4.0 in)
1928	58.2 mm (2.3 in)
1929	76.2 mm (3.0 in)
1930	48.5 mm (1.9 in)
1931	71.1 mm (2.8 in)
1932	55.1 mm (2.2 in)
1933	76.2 mm (3.0 in)
1934	96.7 mm (3.8 in)
1935	65.0 mm (2.6 in)
1936	45.2 mm (1.8 in)
1937	44.7 mm (1.8 in)
1938	86.8 mm (3.4 in)
1939	65.6 mm (2.6 in)
1940	47.0 mm (1.9 in)
1941	56.5 mm (2.2 in)
1942	101.2 mm (4.0 in)
1943	87.1 mm (3.4 in)
1944	90.7 mm (3.6 in)
1945	62.4 mm (2.5 in)
1946	159.5 mm (6.3 in)
1947	57.7 mm (2.3 in)
1948	80.1 mm (3.2 in)
1949	116.8 mm (4.6 in)
1950	92.6 mm (3.6 in)
1951	98.0 mm (3.9 in)
1952	34.6 mm (1.4 in)
1953	90.7 mm (3.6 in)
1954	89.9 mm (3.5 in)
1955	51.0 mm (2.0 in)
1956	21.4 mm (0.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at Fairfax, 1902 to 1956. The record is 98 days in 1904, marked on the chart; the median year is 37 days.

Longest dry spell (CDD) at Fairfax by year
Year	Longest dry spell (CDD)
1902	25 days
1903	37 days
1904	98 days
1905	34 days
1906	49 days
1907	38 days
1908	34 days
1909	58 days
1910	31 days
1911	43 days
1912	54 days
1913	41 days
1914	53 days
1915	60 days
1916	28 days
1917	38 days
1918	21 days
1919	28 days
1920	26 days
1921	40 days
1922	36 days
1923	46 days
1924	29 days
1925	32 days
1926	40 days
1927	72 days
1928	47 days
1929	31 days
1930	45 days
1931	33 days
1932	70 days
1933	49 days
1934	35 days
1935	45 days
1936	36 days
1937	42 days
1938	58 days
1939	63 days
1940	28 days
1941	28 days
1942	45 days
1943	36 days
1944	32 days
1945	41 days
1946	35 days
1947	24 days
1948	23 days
1949	51 days
1950	26 days
1951	27 days
1952	58 days
1953	26 days
1954	30 days
1955	60 days
1956	20 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

39 years with a frost

Across 39 years with a frost, the median last spring frost at Fairfax falls on 7 May and the median first autumn frost on 29 September, which leaves a median of 151 days between them.

Fitted over all years, the growing season changes by +1.4 days per decade at this station.

Frost dates and growing season at Fairfax
Measure	Median, all years	Earliest period	Recent period (1919 to 1953)	Recent against earliest	Fitted trend
Last spring frost	7 May	n/a	7 May	n/a	-0.3 days per decade
First autumn frost	29 September	n/a	30 September	n/a	+1.0 days per decade
Growing days	151 days	n/a	152 days	n/a	+1.4 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

46 years, 1904 to 1953

A day with at least 48.3 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 141.7 mm (5.6 in) of rain is expected about once in 100 years.

Rainfall return levels at Fairfax: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	48.3 mm (1.9 in)
5 years	66.5 mm (2.6 in)
10 years	80.9 mm (3.2 in)
25 years	102.3 mm (4.0 in)
50 years	120.8 mm (4.8 in)	Longer than the 46 years of record
100 years	141.7 mm (5.6 in)	Longer than the 46 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, 46 years of values from 1904 to 1953.

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: 148.6 mm (5.9 in) in 1914; 102.6 mm (4.0 in) in 1946; 99.1 mm (3.9 in) in 1917.

Download the Data

Data for Fairfax standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Fairfax 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).