Thurman Weather Records (USC00138231)

Record envelope, standing records and threshold days for Thurman (USC00138231), Iowa, United States, with 52 years of record.

Key Facts for Thurman

Thurman (USC00138231) is a weather station in Iowa, United States at 40.82 latitude and -95.75 longitude, 296 m (971 ft) above sea level.
The station reports from 1897 to 1948, 52 years of record.
1,464 records set at Thurman still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Thurman tied a daily record high maximum temperature of 21.7 C (71.1 F) on 15 November 1948.

About the Station

Location: Iowa, United States, 40.82 latitude, -95.75 longitude.
Elevation: 296 m (971 ft).
Period of record: 1897 to 1948, 52 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 Thurman. 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 Thurman, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	20.6 C (69.1 F)	-36.1 C (-33.0 F)	n/a	n/a
Feb	21.7 C (71.1 F)	-38.3 C (-36.9 F)	n/a	n/a
Mar	32.2 C (90.0 F)	-28.9 C (-20.0 F)	n/a	n/a
Apr	35.0 C (95.0 F)	-16.7 C (1.9 F)	n/a	n/a
May	42.2 C (108.0 F)	-6.7 C (19.9 F)	n/a	n/a
Jun	41.1 C (106.0 F)	2.8 C (37.0 F)	n/a	n/a
Jul	45.6 C (114.1 F)	4.4 C (39.9 F)	n/a	n/a
Aug	44.4 C (111.9 F)	2.8 C (37.0 F)	n/a	n/a
Sep	41.1 C (106.0 F)	-5.0 C (23.0 F)	n/a	n/a
Oct	35.6 C (96.1 F)	-20.6 C (-5.1 F)	n/a	n/a
Nov	30.6 C (87.1 F)	-23.9 C (-11.0 F)	n/a	n/a
Dec	23.3 C (73.9 F)	-37.8 C (-36.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Thurman still stand. 1936 holds the most, with 62.

Standing records at Thurman by the year they were set
Year set	Standing records
1897	23
1898	28
1899	33
1900	14
1901	27
1902	38
1903	23
1904	23
1905	30
1906	23
1907	31
1908	19
1909	28
1910	31
1911	45
1912	40
1913	53
1914	22
1915	33
1916	28
1917	32
1918	29
1919	26
1920	24
1921	27
1922	17
1923	22
1924	30
1925	34
1926	27
1927	18
1928	32
1929	16
1930	41
1931	42
1932	16
1933	30
1934	58
1935	26
1936	62
1937	24
1938	43
1939	37
1940	21
1941	23
1942	14
1943	22
1944	22
1945	6
1946	22
1947	17
1948	12

All-Time Record Progression

4 new records

4 all-time records were set at Thurman between 19 July 1934 and 25 July 1936. Each dot is a new record.

When Thurman set new all-time records
Date	Kind	Detail
1934-07-19	Record high maximum temperature	Record high maximum temperature 43.9 C (111.0 F)
1934-08-08	Record high maximum temperature	Record high maximum temperature 44.4 C (111.9 F)
1936-07-25	Record high maximum temperature	Record high maximum temperature 45.6 C (114.1 F)
1936-07-25	Record high minimum temperature	Record high minimum temperature 28.9 C (84.0 F)

Wettest Day of Each Month

Jul: 246.4 mm (9.7 in)

The wettest day on record for each calendar month at Thurman. The most was 246.4 mm (9.7 in) on 6 July 1898.

Record daily precipitation for each month at Thurman
Month	Record daily precipitation (mm)	Date
Jan	35.6 mm (1.4 in)	5 January 1932
Feb	43.2 mm (1.7 in)	13 February 1919
Mar	88.9 mm (3.5 in)	8 March 1946
Apr	73.7 mm (2.9 in)	9 April 1922
May	121.9 mm (4.8 in)	22 May 1903
Jun	158.5 mm (6.2 in)	15 June 1900
Jul	246.4 mm (9.7 in)	6 July 1898
Aug	127.8 mm (5.0 in)	17 August 1915
Sep	198.1 mm (7.8 in)	15 September 1941
Oct	78.2 mm (3.1 in)	26 October 1918
Nov	100.6 mm (4.0 in)	13 November 1909
Dec	47.0 mm (1.9 in)	9 December 1907

Period of Record Coverage

1897 to 1948

52 years of record at Thurman, 1897 to 1948. 6 years have data for under 90 percent of days and are left out of rankings: 1897, 1932, 1942, 1944, 1945, 1948.

Days with data per year at Thurman
Year	Days with data	Share of year	Complete
1897	199	55%	No
1898	363	99%	Yes
1899	358	98%	Yes
1900	362	99%	Yes
1901	359	98%	Yes
1902	350	96%	Yes
1903	337	92%	Yes
1904	364	99%	Yes
1905	363	99%	Yes
1906	359	98%	Yes
1907	359	98%	Yes
1908	364	99%	Yes
1909	365	100%	Yes
1910	365	100%	Yes
1911	363	99%	Yes
1912	363	99%	Yes
1913	363	99%	Yes
1914	362	99%	Yes
1915	361	99%	Yes
1916	363	99%	Yes
1917	359	98%	Yes
1918	361	99%	Yes
1919	364	100%	Yes
1920	365	100%	Yes
1921	363	99%	Yes
1922	361	99%	Yes
1923	360	99%	Yes
1924	362	99%	Yes
1925	364	100%	Yes
1926	364	100%	Yes
1927	365	100%	Yes
1928	364	99%	Yes
1929	365	100%	Yes
1930	365	100%	Yes
1931	365	100%	Yes
1932	274	75%	No
1933	361	99%	Yes
1934	363	99%	Yes
1935	364	100%	Yes
1936	364	99%	Yes
1937	331	91%	Yes
1938	364	100%	Yes
1939	361	99%	Yes
1940	365	100%	Yes
1941	364	100%	Yes
1942	219	60%	No
1943	364	100%	Yes
1944	273	75%	No
1945	189	52%	No
1946	361	99%	Yes
1947	364	100%	Yes
1948	329	90%	No

Latest Records

Latest records at Thurman
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
15 November 1948	Thurman, US	daily high max (Tie)	21.7 C (71.1 F)	tie	18 years	2 of 100 (Routine)
18 October 1948	Thurman, US	daily low min	-7.2 C (19.0 F)	1.1 C (2.0 F)	26 years	13 of 100 (Routine)
7 September 1948	Thurman, US	daily rain	38.4 mm (1.5 in)	14.3 mm (0.6 in)	41 years	23 of 100 (Routine)
23 August 1948	Thurman, US	daily high max	36.7 C (98.1 F)	0.6 C (1.1 F)	10 years	9 of 100 (Routine)
6 August 1948	Thurman, US	daily low max	21.1 C (70.0 F)	3.9 C (7.0 F)	38 years	25 of 100 (Routine)
5 August 1948	Thurman, US	daily low min	8.9 C (48.0 F)	0.5 C (0.9 F)	38 years	17 of 100 (Routine)
23 July 1948	Thurman, US	daily low min	10.0 C (50.0 F)	1.1 C (2.0 F)	44 years	20 of 100 (Routine)
22 July 1948	Thurman, US	daily low max (Tie)	25.6 C (78.1 F)	tie	44 years	4 of 100 (Routine)
21 July 1948	Thurman, US	daily rain	29.5 mm (1.2 in)	9.7 mm (0.38 in)	45 years	22 of 100 (Routine)
22 June 1948	Thurman, US	daily rain	30.5 mm (1.2 in)	1.0 mm (0.04 in)	19 years	10 of 100 (Routine)
24 April 1948	Thurman, US	daily rain	32.5 mm (1.3 in)	11.7 mm (0.5 in)	48 years	30 of 100 (Routine)
19 April 1948	Thurman, US	daily high min	16.1 C (61.0 F)	1.1 C (2.0 F)	10 years	9 of 100 (Routine)
18 April 1948	Thurman, US	daily high max	32.8 C (91.0 F)	4.5 C (8.1 F)	31 years	20 of 100 (Routine)
18 April 1948	Thurman, US	daily high min (Tie)	17.2 C (63.0 F)	tie	31 years	3 of 100 (Routine)
27 March 1948	Thurman, US	daily rain	38.1 mm (1.5 in)	27.4 mm (1.1 in)	49 years	48 of 100 (Notable)
19 March 1948	Thurman, US	daily rain	37.8 mm (1.5 in)	19.3 mm (0.8 in)	26 years	32 of 100 (Routine)
12 March 1948	Thurman, US	daily low min	-20.6 C (-5.1 F)	2.8 C (5.0 F)	42 years	21 of 100 (Routine)
11 March 1948	Thurman, US	daily low max	-11.1 C (12.0 F)	6.1 C (11.0 F)	42 years	24 of 100 (Routine)
11 March 1948	Thurman, US	daily low min	-27.2 C (-17.0 F)	4.4 C (7.9 F)	36 years	22 of 100 (Routine)
10 March 1948	Thurman, US	monthly low max	-12.8 C (9.0 F)	1.1 C (2.0 F)	16 years	20 of 100 (Routine)

Climate Trend

42 complete years, 1898 to 1947

One stripe for each of 42 complete years at Thurman, 1898 to 1947. Blue stripes are years cooler than the station's own mean of 10.8 C (51.5 F); red stripes are warmer. The coolest year was 1917, at 9.0 C (48.2 F), and the warmest was 1931, at 12.9 C (55.2 F). The strongest colour marks a difference of 2.1 C (3.8 F).

Annual mean temperature at Thurman as warming stripes, 1898 to 1947
Year	Annual mean temperature	Difference from the station mean
1898	10.0 C	-0.89 C
1899	10.0 C	-0.86 C
1900	10.9 C	+0.05 C
1901	10.3 C	-0.56 C
1904	9.2 C	-1.64 C
1905	9.8 C	-1.03 C
1906	10.3 C	-0.55 C
1907	10.0 C	-0.82 C
1908	11.0 C	+0.11 C
1909	9.8 C	-1.01 C
1910	10.4 C	-0.40 C
1911	11.1 C	+0.29 C
1912	9.1 C	-1.77 C
1913	11.0 C	+0.19 C
1914	10.8 C	-0.01 C
1915	9.6 C	-1.23 C
1917	9.0 C	-1.82 C
1918	11.3 C	+0.41 C
1919	10.6 C	-0.26 C
1920	10.2 C	-0.61 C
1921	12.9 C	+2.04 C
1922	11.3 C	+0.49 C
1923	10.5 C	-0.37 C
1924	9.5 C	-1.35 C
1925	11.1 C	+0.21 C
1926	11.2 C	+0.31 C
1927	11.1 C	+0.28 C
1928	11.4 C	+0.53 C
1929	9.7 C	-1.13 C
1930	11.7 C	+0.82 C
1931	12.9 C	+2.04 C
1933	11.9 C	+1.08 C
1934	12.6 C	+1.80 C
1935	11.2 C	+0.39 C
1936	10.5 C	-0.37 C
1938	12.7 C	+1.89 C
1939	12.8 C	+1.92 C
1940	10.4 C	-0.44 C
1941	12.4 C	+1.55 C
1943	10.7 C	-0.11 C
1946	11.9 C	+1.06 C
1947	10.6 C	-0.20 C

The annual mean temperature here has risen by 0.4 C (0.2 to 0.6) per decade over 1898 to 1947. In Fahrenheit: 0.7 F (0.4 to 1.1) per decade. The slope is a straight line fitted to 42 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Thurman
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.4 C (0.2 to 0.6) per decade	0.7 F (0.4 to 1.1) per decade	1898 to 1947	42	Rise
Mean daily maximum	0.5 C (0.3 to 0.8) per decade	1.0 F (0.5 to 1.4) per decade	1898 to 1947	42	Rise
Mean daily minimum	0.3 C (0.1 to 0.5) per decade	0.5 F (0.1 to 0.8) per decade	1898 to 1947	42	Rise

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

1897 to 1948

Yearly extremes at Thurman: 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	37.8 C (100.0 F)	52
Coldest night (TNn)	-38.3 C (-36.9 F)	1905	-28.6 C (-19.5 F)	52
Wettest day (Rx1day)	246.4 mm (9.7 in)	1898	77.7 mm (3.1 in)	52
Wettest five days (Rx5day)	259.7 mm (10.2 in)	1898	102.2 mm (4.0 in)	52
Longest dry spell (CDD)	55 days	1910	30 days	52

Hottest day (TXx)

The hottest day of the year at Thurman, 1897 to 1948. The record is 45.6 C (114.1 F) in 1936, marked on the chart; the median year is 37.8 C (100.0 F).

Hottest day (TXx) at Thurman by year
Year	Hottest day (TXx)
1897	37.8 C (100.0 F)
1898	37.2 C (99.0 F)
1899	35.6 C (96.1 F)
1900	35.6 C (96.1 F)
1901	38.9 C (102.0 F)
1902	35.6 C (96.1 F)
1903	37.8 C (100.0 F)
1904	34.4 C (93.9 F)
1905	35.6 C (96.1 F)
1906	36.7 C (98.1 F)
1907	38.9 C (102.0 F)
1908	35.6 C (96.1 F)
1909	36.7 C (98.1 F)
1910	40.0 C (104.0 F)
1911	41.7 C (107.1 F)
1912	38.9 C (102.0 F)
1913	42.2 C (108.0 F)
1914	38.9 C (102.0 F)
1915	35.0 C (95.0 F)
1916	36.1 C (97.0 F)
1917	39.4 C (102.9 F)
1918	42.8 C (109.0 F)
1919	38.9 C (102.0 F)
1920	37.2 C (99.0 F)
1921	36.7 C (98.1 F)
1922	37.2 C (99.0 F)
1923	36.7 C (98.1 F)
1924	36.7 C (98.1 F)
1925	39.4 C (102.9 F)
1926	38.9 C (102.0 F)
1927	38.3 C (100.9 F)
1928	35.6 C (96.1 F)
1929	36.7 C (98.1 F)
1930	42.8 C (109.0 F)
1931	40.6 C (105.1 F)
1932	37.8 C (100.0 F)
1933	41.1 C (106.0 F)
1934	44.4 C (111.9 F)
1935	41.1 C (106.0 F)
1936	45.6 C (114.1 F)
1937	38.3 C (100.9 F)
1938	40.0 C (104.0 F)
1939	41.1 C (106.0 F)
1940	43.3 C (109.9 F)
1941	40.0 C (104.0 F)
1942	30.6 C (87.1 F)
1943	37.8 C (100.0 F)
1944	37.8 C (100.0 F)
1945	37.8 C (100.0 F)
1946	41.1 C (106.0 F)
1947	37.8 C (100.0 F)
1948	36.7 C (98.1 F)

Coldest night (TNn)

The coldest night of the year at Thurman, 1897 to 1948. The record is -38.3 C (-36.9 F) in 1905, marked on the chart; the median year is -28.6 C (-19.5 F).

Coldest night (TNn) at Thurman by year
Year	Coldest night (TNn)
1897	-28.3 C (-18.9 F)
1898	-23.9 C (-11.0 F)
1899	-31.7 C (-25.1 F)
1900	-25.6 C (-14.1 F)
1901	-32.8 C (-27.0 F)
1902	-32.8 C (-27.0 F)
1903	-26.1 C (-15.0 F)
1904	-28.9 C (-20.0 F)
1905	-38.3 C (-36.9 F)
1906	-25.6 C (-14.1 F)
1907	-27.2 C (-17.0 F)
1908	-26.7 C (-16.1 F)
1909	-27.8 C (-18.0 F)
1910	-34.4 C (-29.9 F)
1911	-30.6 C (-23.1 F)
1912	-33.9 C (-29.0 F)
1913	-31.7 C (-25.1 F)
1914	-28.9 C (-20.0 F)
1915	-34.4 C (-29.9 F)
1916	-30.6 C (-23.1 F)
1917	-30.0 C (-22.0 F)
1918	-34.4 C (-29.9 F)
1919	-37.8 C (-36.0 F)
1920	-29.4 C (-20.9 F)
1921	-20.0 C (-4.0 F)
1922	-21.7 C (-7.1 F)
1923	-24.4 C (-11.9 F)
1924	-35.6 C (-32.1 F)
1925	-27.2 C (-17.0 F)
1926	-27.8 C (-18.0 F)
1927	-23.3 C (-9.9 F)
1928	-23.3 C (-9.9 F)
1929	-26.7 C (-16.1 F)
1930	-36.1 C (-33.0 F)
1931	-18.3 C (-0.9 F)
1932	-25.6 C (-14.1 F)
1933	-28.9 C (-20.0 F)
1934	-26.7 C (-16.1 F)
1935	-24.4 C (-11.9 F)
1936	-35.0 C (-31.0 F)
1937	-25.0 C (-13.0 F)
1938	-26.7 C (-16.1 F)
1939	-24.4 C (-11.9 F)
1940	-31.1 C (-24.0 F)
1941	-16.7 C (1.9 F)
1942	-31.1 C (-24.0 F)
1943	-29.4 C (-20.9 F)
1944	-31.7 C (-25.1 F)
1945	-27.8 C (-18.0 F)
1946	-24.4 C (-11.9 F)
1947	-30.6 C (-23.1 F)
1948	-28.9 C (-20.0 F)

Wettest day (Rx1day)

The wettest day of the year at Thurman, 1897 to 1948. The record is 246.4 mm (9.7 in) in 1898, marked on the chart; the median year is 77.7 mm (3.1 in).

Wettest day (Rx1day) at Thurman by year
Year	Wettest day (Rx1day)
1897	45.7 mm (1.8 in)
1898	246.4 mm (9.7 in)
1899	104.1 mm (4.1 in)
1900	158.5 mm (6.2 in)
1901	61.5 mm (2.4 in)
1902	101.1 mm (4.0 in)
1903	121.9 mm (4.8 in)
1904	159.3 mm (6.3 in)
1905	122.4 mm (4.8 in)
1906	193.0 mm (7.6 in)
1907	83.8 mm (3.3 in)
1908	78.7 mm (3.1 in)
1909	100.6 mm (4.0 in)
1910	85.1 mm (3.4 in)
1911	41.7 mm (1.6 in)
1912	71.4 mm (2.8 in)
1913	86.9 mm (3.4 in)
1914	54.4 mm (2.1 in)
1915	127.8 mm (5.0 in)
1916	57.7 mm (2.3 in)
1917	79.2 mm (3.1 in)
1918	78.2 mm (3.1 in)
1919	97.8 mm (3.9 in)
1920	46.2 mm (1.8 in)
1921	96.0 mm (3.8 in)
1922	77.7 mm (3.1 in)
1923	78.7 mm (3.1 in)
1924	36.1 mm (1.4 in)
1925	66.3 mm (2.6 in)
1926	39.6 mm (1.6 in)
1927	32.0 mm (1.3 in)
1928	88.9 mm (3.5 in)
1929	69.1 mm (2.7 in)
1930	33.5 mm (1.3 in)
1931	66.5 mm (2.6 in)
1932	119.4 mm (4.7 in)
1933	59.7 mm (2.4 in)
1934	61.0 mm (2.4 in)
1935	63.5 mm (2.5 in)
1936	46.0 mm (1.8 in)
1937	62.2 mm (2.4 in)
1938	63.8 mm (2.5 in)
1939	45.5 mm (1.8 in)
1940	55.9 mm (2.2 in)
1941	198.1 mm (7.8 in)
1942	32.0 mm (1.3 in)
1943	82.6 mm (3.3 in)
1944	57.4 mm (2.3 in)
1945	77.7 mm (3.1 in)
1946	165.6 mm (6.5 in)
1947	87.4 mm (3.4 in)
1948	46.5 mm (1.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Thurman, 1897 to 1948. The record is 259.7 mm (10.2 in) in 1898, marked on the chart; the median year is 102.2 mm (4.0 in).

Wettest five days (Rx5day) at Thurman by year
Year	Wettest five days (Rx5day)
1897	69.0 mm (2.7 in)
1898	259.7 mm (10.2 in)
1899	110.5 mm (4.4 in)
1900	242.4 mm (9.5 in)
1901	91.9 mm (3.6 in)
1902	111.3 mm (4.4 in)
1903	151.9 mm (6.0 in)
1904	188.6 mm (7.4 in)
1905	225.6 mm (8.9 in)
1906	243.3 mm (9.6 in)
1907	83.8 mm (3.3 in)
1908	106.4 mm (4.2 in)
1909	193.2 mm (7.6 in)
1910	103.9 mm (4.1 in)
1911	83.8 mm (3.3 in)
1912	119.1 mm (4.7 in)
1913	87.4 mm (3.4 in)
1914	88.4 mm (3.5 in)
1915	130.8 mm (5.1 in)
1916	76.3 mm (3.0 in)
1917	118.0 mm (4.6 in)
1918	145.5 mm (5.7 in)
1919	141.7 mm (5.6 in)
1920	64.8 mm (2.6 in)
1921	152.2 mm (6.0 in)
1922	115.9 mm (4.6 in)
1923	169.6 mm (6.7 in)
1924	82.4 mm (3.2 in)
1925	94.3 mm (3.7 in)
1926	108.0 mm (4.3 in)
1927	45.0 mm (1.8 in)
1928	133.1 mm (5.2 in)
1929	83.1 mm (3.3 in)
1930	56.8 mm (2.2 in)
1931	124.8 mm (4.9 in)
1932	134.1 mm (5.3 in)
1933	84.4 mm (3.3 in)
1934	69.1 mm (2.7 in)
1935	83.8 mm (3.3 in)
1936	70.1 mm (2.8 in)
1937	74.4 mm (2.9 in)
1938	93.4 mm (3.7 in)
1939	68.6 mm (2.7 in)
1940	103.1 mm (4.1 in)
1941	241.5 mm (9.5 in)
1942	42.7 mm (1.7 in)
1943	83.9 mm (3.3 in)
1944	69.9 mm (2.8 in)
1945	101.3 mm (4.0 in)
1946	181.6 mm (7.1 in)
1947	98.4 mm (3.9 in)
1948	69.9 mm (2.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at Thurman, 1897 to 1948. The record is 55 days in 1910, marked on the chart; the median year is 30 days.

Longest dry spell (CDD) at Thurman by year
Year	Longest dry spell (CDD)
1897	29 days
1898	20 days
1899	26 days
1900	24 days
1901	31 days
1902	30 days
1903	31 days
1904	52 days
1905	30 days
1906	33 days
1907	25 days
1908	25 days
1909	18 days
1910	55 days
1911	20 days
1912	29 days
1913	28 days
1914	54 days
1915	23 days
1916	23 days
1917	49 days
1918	22 days
1919	30 days
1920	26 days
1921	46 days
1922	31 days
1923	36 days
1924	34 days
1925	26 days
1926	23 days
1927	53 days
1928	36 days
1929	19 days
1930	30 days
1931	30 days
1932	18 days
1933	37 days
1934	36 days
1935	25 days
1936	32 days
1937	35 days
1938	45 days
1939	52 days
1940	27 days
1941	21 days
1942	31 days
1943	36 days
1944	26 days
1945	23 days
1946	43 days
1947	26 days
1948	25 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

42 years with a frost

Across 42 years with a frost, the median last spring frost at Thurman falls on 2 May and the median first autumn frost on 8 October, which leaves a median of 157 days between them.

Fitted over all years, the growing season changes by +1.9 days per decade at this station.

Frost dates and growing season at Thurman
Measure	Median, all years	Earliest period	Recent period (1912 to 1947)	Recent against earliest	Fitted trend
Last spring frost	2 May	n/a	30 April	n/a	-0.5 days per decade
First autumn frost	8 October	n/a	7 October	n/a	+1.4 days per decade
Growing days	157 days	n/a	157 days	n/a	+1.9 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, 1898 to 1948

A day with at least 74.7 mm (2.9 in) of rain is expected about once in 2 years. A day with at least 276.1 mm (10.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Thurman: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	74.7 mm (2.9 in)
5 years	113.1 mm (4.5 in)
10 years	143.8 mm (5.7 in)
25 years	189.8 mm (7.5 in)
50 years	230.1 mm (9.1 in)	Longer than the 46 years of record
100 years	276.1 mm (10.9 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 1898 to 1948.

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: 246.4 mm (9.7 in) in 1898; 198.1 mm (7.8 in) in 1941; 193.0 mm (7.6 in) in 1906.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Download the Data

Data for Thurman standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Thurman 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).