Sprague Weather Records (USC00457956)

Record envelope, standing records and threshold days for Sprague (USC00457956), Washington, United States, with 84 years of record.

Key Facts for Sprague

Sprague (USC00457956) is a weather station in Washington, United States at 47.30 latitude and -117.98 longitude, 601 m (1,970 ft) above sea level.
The station reports from 1899 to 1982, 84 years of record.
1,464 records set at Sprague still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Sprague set a daily record high minimum temperature of 18.3 C (64.9 F) on 31 August 1982.

About the Station

Location: Washington, United States, 47.30 latitude, -117.98 longitude.
Elevation: 601 m (1,970 ft).
Period of record: 1899 to 1982, 84 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 Sprague. 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 Sprague, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	15.0 C (59.0 F)	-35.0 C (-31.0 F)	n/a	n/a
Feb	17.8 C (64.0 F)	-36.1 C (-33.0 F)	n/a	n/a
Mar	23.9 C (75.0 F)	-17.8 C (0.0 F)	n/a	n/a
Apr	32.2 C (90.0 F)	-10.0 C (14.0 F)	n/a	n/a
May	37.2 C (99.0 F)	-6.1 C (21.0 F)	n/a	n/a
Jun	38.9 C (102.0 F)	-2.8 C (27.0 F)	n/a	n/a
Jul	42.8 C (109.0 F)	-0.6 C (30.9 F)	n/a	n/a
Aug	43.3 C (109.9 F)	-0.6 C (30.9 F)	n/a	n/a
Sep	38.9 C (102.0 F)	-6.7 C (19.9 F)	n/a	n/a
Oct	33.3 C (91.9 F)	-15.6 C (3.9 F)	n/a	n/a
Nov	22.2 C (72.0 F)	-26.1 C (-15.0 F)	n/a	n/a
Dec	16.7 C (62.1 F)	-29.4 C (-20.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Sprague still stand. 1982 holds the most, with 51.

Standing records at Sprague by the year they were set
Year set	Standing records
1931	4
1932	44
1933	33
1934	40
1935	33
1936	35
1937	34
1938	28
1939	41
1940	32
1941	34
1942	26
1943	29
1944	30
1945	23
1946	19
1947	24
1948	19
1949	38
1950	48
1951	17
1952	24
1953	26
1954	22
1955	45
1956	26
1957	26
1958	27
1959	19
1960	31
1961	28
1962	28
1963	22
1964	17
1965	26
1966	23
1967	20
1968	34
1969	22
1970	31
1971	38
1972	25
1973	23
1974	25
1975	22
1976	27
1977	27
1978	24
1979	16
1980	28
1981	30
1982	51

All-Time Record Progression

1 new records

1 all-time records were set at Sprague between 30 December 1968 and 30 December 1968. Each dot is a new record.

Wettest Day of Each Month

Nov: 50.8 mm (2.0 in)

The wettest day on record for each calendar month at Sprague. The most was 50.8 mm (2.0 in) on 22 November 1901.

Record daily precipitation for each month at Sprague
Month	Record daily precipitation (mm)	Date
Jan	38.1 mm (1.5 in)	14 January 1901
Feb	43.2 mm (1.7 in)	15 February 1901
Mar	22.4 mm (0.9 in)	17 March 1919
Apr	38.1 mm (1.5 in)	5 April 1901
May	31.2 mm (1.2 in)	9 May 1972
Jun	35.1 mm (1.4 in)	17 June 1950
Jul	38.1 mm (1.5 in)	8 July 1982
Aug	20.8 mm (0.8 in)	20 August 1959
Sep	32.0 mm (1.3 in)	22 September 1945
Oct	25.7 mm (1.0 in)	31 October 1933
Nov	50.8 mm (2.0 in)	22 November 1901
Dec	26.7 mm (1.1 in)	14 December 1977

Period of Record Coverage

1932 to 1982

51 years of record at Sprague, 1932 to 1982. 15 years have data for under 90 percent of days and are left out of rankings: 1932, 1935, 1936, 1937, 1938, 1939, 1945, 1948 and others.

Days with data per year at Sprague
Year	Days with data	Share of year	Complete
1932	327	89%	No
1933	348	95%	Yes
1934	334	92%	Yes
1935	253	69%	No
1936	214	58%	No
1937	302	83%	No
1938	303	83%	No
1939	314	86%	No
1940	361	99%	Yes
1941	363	99%	Yes
1942	365	100%	Yes
1943	358	98%	Yes
1944	358	98%	Yes
1945	323	88%	No
1946	336	92%	Yes
1947	349	96%	Yes
1948	214	58%	No
1949	358	98%	Yes
1950	363	99%	Yes
1951	363	99%	Yes
1952	366	100%	Yes
1953	273	75%	No
1954	242	66%	No
1955	363	99%	Yes
1956	365	100%	Yes
1957	320	88%	No
1958	345	95%	Yes
1959	357	98%	Yes
1960	358	98%	Yes
1961	364	100%	Yes
1962	362	99%	Yes
1963	332	91%	Yes
1964	330	90%	Yes
1965	334	92%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	362	99%	Yes
1971	365	100%	Yes
1972	335	92%	Yes
1973	334	92%	Yes
1974	287	79%	No
1975	275	75%	No
1976	365	100%	Yes
1977	364	100%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	302	83%	No
1982	204	56%	No

Latest Records

Latest records at Sprague
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
31 August 1982	Sprague, US	daily high min	18.3 C (64.9 F)	2.7 C (4.9 F)	19 years	17 of 100 (Routine)
30 August 1982	Sprague, US	daily high min	17.8 C (64.0 F)	2.2 C (4.0 F)	15 years	15 of 100 (Routine)
29 August 1982	Sprague, US	daily high min	17.8 C (64.0 F)	3.4 C (6.1 F)	48 years	28 of 100 (Routine)
28 August 1982	Sprague, US	daily high min	19.4 C (66.9 F)	2.7 C (4.9 F)	45 years	25 of 100 (Routine)
27 August 1982	Sprague, US	daily high min	20.0 C (68.0 F)	5.0 C (9.0 F)	31 years	28 of 100 (Routine)
26 August 1982	Sprague, US	daily high max	36.7 C (98.1 F)	1.7 C (3.1 F)	48 years	22 of 100 (Routine)
26 August 1982	Sprague, US	monthly high min (Tie)	20.6 C (69.1 F)	tie	26 years	5 of 100 (Routine)
25 August 1982	Sprague, US	monthly high min (Tie)	20.6 C (69.1 F)	tie	26 years	5 of 100 (Routine)
24 August 1982	Sprague, US	daily high min	18.9 C (66.0 F)	2.2 C (4.0 F)	43 years	23 of 100 (Routine)
23 August 1982	Sprague, US	daily high min	20.0 C (68.0 F)	4.4 C (7.9 F)	20 years	23 of 100 (Routine)
22 August 1982	Sprague, US	daily high min	19.4 C (66.9 F)	2.2 C (4.0 F)	40 years	23 of 100 (Routine)
21 August 1982	Sprague, US	daily high min	20.0 C (68.0 F)	5.6 C (10.1 F)	20 years	27 of 100 (Routine)
19 August 1982	Sprague, US	daily high min	17.8 C (64.0 F)	2.2 C (4.0 F)	48 years	25 of 100 (Routine)
18 August 1982	Sprague, US	daily high min	17.2 C (63.0 F)	1.6 C (2.9 F)	4 years	10 of 100 (Routine)
20 July 1982	Sprague, US	daily low min	4.4 C (39.9 F)	1.2 C (2.2 F)	27 years	16 of 100 (Routine)
15 July 1982	Sprague, US	daily low max	19.4 C (66.9 F)	2.8 C (5.0 F)	40 years	23 of 100 (Routine)
8 July 1982	Sprague, US	monthly rain	38.1 mm (1.5 in)	15.2 mm (0.6 in)	41 years	63 of 100 (Major)
20 June 1982	Sprague, US	daily high max (Tie)	35.0 C (95.0 F)	tie	8 years	1 of 100 (Routine)
11 June 1982	Sprague, US	daily high min	20.0 C (68.0 F)	5.0 C (9.0 F)	21 years	24 of 100 (Routine)
4 June 1982	Sprague, US	daily high min	15.0 C (59.0 F)	0.6 C (1.1 F)	12 years	9 of 100 (Routine)

Climate Trend

28 complete years, 1940 to 1980

One stripe for each of 28 complete years at Sprague, 1940 to 1980. Blue stripes are years cooler than the station's own mean of 8.7 C (47.7 F); red stripes are warmer. The coolest year was 1955, at 7.4 C (45.3 F), and the warmest was 1940, at 10.0 C (50.0 F). The strongest colour marks a difference of 1.4 C (2.5 F).

Annual mean temperature at Sprague as warming stripes, 1940 to 1980
Year	Annual mean temperature	Difference from the station mean
1940	10.0 C	+1.24 C
1941	9.9 C	+1.19 C
1942	8.9 C	+0.14 C
1943	8.5 C	-0.28 C
1944	9.3 C	+0.58 C
1945	9.5 C	+0.77 C
1946	9.4 C	+0.67 C
1947	9.7 C	+0.95 C
1950	7.8 C	-0.91 C
1951	8.6 C	-0.10 C
1952	9.1 C	+0.36 C
1955	7.4 C	-1.34 C
1956	8.6 C	-0.18 C
1959	8.5 C	-0.21 C
1960	8.6 C	-0.14 C
1961	9.6 C	+0.85 C
1962	9.2 C	+0.41 C
1966	9.4 C	+0.64 C
1967	9.5 C	+0.76 C
1968	9.1 C	+0.31 C
1969	8.0 C	-0.76 C
1970	8.6 C	-0.13 C
1971	8.1 C	-0.67 C
1976	7.9 C	-0.82 C
1977	8.0 C	-0.79 C
1978	8.0 C	-0.79 C
1979	7.9 C	-0.89 C
1980	7.8 C	-0.91 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

1899 to 1982

Yearly extremes at Sprague: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	43.3 C (109.9 F)	1961	38.9 C (102.0 F)	51
Coldest night (TNn)	-36.1 C (-33.0 F)	1950	-21.9 C (-7.5 F)	52
Wettest day (Rx1day)	50.8 mm (2.0 in)	1901	22.1 mm (0.9 in)	70
Wettest five days (Rx5day)	82.3 mm (3.2 in)	1927	38.2 mm (1.5 in)	70
Longest dry spell (CDD)	99 days	1929	42 days	70

Hottest day (TXx)

The hottest day of the year at Sprague, 1899 to 1982. The record is 43.3 C (109.9 F) in 1961, marked on the chart; the median year is 38.9 C (102.0 F).

Hottest day (TXx) at Sprague by year
Year	Hottest day (TXx)
1899	n/a
1900	n/a
1901	n/a
1902	n/a
1903	n/a
1904	n/a
1905	n/a
1914	n/a
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	39.4 C (102.9 F)
1933	38.9 C (102.0 F)
1934	40.6 C (105.1 F)
1935	40.0 C (104.0 F)
1936	40.6 C (105.1 F)
1937	40.0 C (104.0 F)
1938	40.0 C (104.0 F)
1939	42.8 C (109.0 F)
1940	38.3 C (100.9 F)
1941	41.7 C (107.1 F)
1942	38.9 C (102.0 F)
1943	39.4 C (102.9 F)
1944	38.9 C (102.0 F)
1945	38.3 C (100.9 F)
1946	39.4 C (102.9 F)
1947	37.8 C (100.0 F)
1948	35.6 C (96.1 F)
1949	38.9 C (102.0 F)
1950	37.8 C (100.0 F)
1951	38.3 C (100.9 F)
1952	38.3 C (100.9 F)
1953	28.3 C (82.9 F)
1954	33.9 C (93.0 F)
1955	40.0 C (104.0 F)
1956	37.8 C (100.0 F)
1957	35.6 C (96.1 F)
1958	38.9 C (102.0 F)
1959	38.9 C (102.0 F)
1960	40.6 C (105.1 F)
1961	43.3 C (109.9 F)
1962	37.8 C (100.0 F)
1963	36.7 C (98.1 F)
1964	38.9 C (102.0 F)
1965	38.3 C (100.9 F)
1966	39.4 C (102.9 F)
1967	41.1 C (106.0 F)
1968	39.4 C (102.9 F)
1969	36.1 C (97.0 F)
1970	39.4 C (102.9 F)
1971	39.4 C (102.9 F)
1972	40.6 C (105.1 F)
1973	37.8 C (100.0 F)
1974	37.2 C (99.0 F)
1975	38.9 C (102.0 F)
1976	33.9 C (93.0 F)
1977	37.8 C (100.0 F)
1978	36.7 C (98.1 F)
1979	39.4 C (102.9 F)
1980	38.3 C (100.9 F)
1981	38.3 C (100.9 F)
1982	38.3 C (100.9 F)

Coldest night (TNn)

The coldest night of the year at Sprague, 1899 to 1982. The record is -36.1 C (-33.0 F) in 1950, marked on the chart; the median year is -21.9 C (-7.5 F).

Coldest night (TNn) at Sprague by year
Year	Coldest night (TNn)
1899	n/a
1900	n/a
1901	n/a
1902	n/a
1903	n/a
1904	n/a
1905	n/a
1914	n/a
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	-18.9 C (-2.0 F)
1932	-21.1 C (-6.0 F)
1933	-28.3 C (-18.9 F)
1934	-8.3 C (17.1 F)
1935	-27.2 C (-17.0 F)
1936	-25.0 C (-13.0 F)
1937	-28.9 C (-20.0 F)
1938	-15.6 C (3.9 F)
1939	-23.3 C (-9.9 F)
1940	-13.3 C (8.1 F)
1941	-14.4 C (6.1 F)
1942	-22.8 C (-9.0 F)
1943	-22.8 C (-9.0 F)
1944	-15.0 C (5.0 F)
1945	-15.0 C (5.0 F)
1946	-19.4 C (-2.9 F)
1947	-23.9 C (-11.0 F)
1948	-21.7 C (-7.1 F)
1949	-27.8 C (-18.0 F)
1950	-36.1 C (-33.0 F)
1951	-20.0 C (-4.0 F)
1952	-27.8 C (-18.0 F)
1953	-11.1 C (12.0 F)
1954	-28.9 C (-20.0 F)
1955	-26.1 C (-15.0 F)
1956	-26.7 C (-16.1 F)
1957	-33.3 C (-27.9 F)
1958	-12.2 C (10.0 F)
1959	-18.9 C (-2.0 F)
1960	-21.1 C (-6.0 F)
1961	-22.2 C (-8.0 F)
1962	-22.2 C (-8.0 F)
1963	-21.1 C (-6.0 F)
1964	-29.4 C (-20.9 F)
1965	-15.6 C (3.9 F)
1966	-21.7 C (-7.1 F)
1967	-17.2 C (1.0 F)
1968	-27.8 C (-18.0 F)
1969	-28.9 C (-20.0 F)
1970	-16.1 C (3.0 F)
1971	-22.2 C (-8.0 F)
1972	-24.4 C (-11.9 F)
1973	-18.9 C (-2.0 F)
1974	-23.9 C (-11.0 F)
1975	-18.9 C (-2.0 F)
1976	-14.4 C (6.1 F)
1977	-18.3 C (-0.9 F)
1978	-28.3 C (-18.9 F)
1979	-28.9 C (-20.0 F)
1980	-24.4 C (-11.9 F)
1981	-16.7 C (1.9 F)
1982	-11.1 C (12.0 F)

Wettest day (Rx1day)

The wettest day of the year at Sprague, 1899 to 1982. The record is 50.8 mm (2.0 in) in 1901, marked on the chart; the median year is 22.1 mm (0.9 in).

Wettest day (Rx1day) at Sprague by year
Year	Wettest day (Rx1day)
1899	6.9 mm (0.27 in)
1900	30.5 mm (1.2 in)
1901	50.8 mm (2.0 in)
1902	45.7 mm (1.8 in)
1903	27.9 mm (1.1 in)
1904	25.4 mm (1.0 in)
1905	38.1 mm (1.5 in)
1914	18.8 mm (0.7 in)
1915	22.9 mm (0.9 in)
1916	23.9 mm (0.9 in)
1917	20.3 mm (0.8 in)
1918	17.8 mm (0.7 in)
1919	22.4 mm (0.9 in)
1926	20.1 mm (0.8 in)
1927	27.9 mm (1.1 in)
1928	21.6 mm (0.9 in)
1929	15.7 mm (0.6 in)
1930	21.3 mm (0.8 in)
1931	19.6 mm (0.8 in)
1932	19.1 mm (0.8 in)
1933	25.7 mm (1.0 in)
1934	25.4 mm (1.0 in)
1935	15.2 mm (0.6 in)
1936	25.7 mm (1.0 in)
1937	19.6 mm (0.8 in)
1938	20.1 mm (0.8 in)
1939	15.7 mm (0.6 in)
1940	26.4 mm (1.0 in)
1941	20.6 mm (0.8 in)
1942	27.9 mm (1.1 in)
1943	21.8 mm (0.9 in)
1944	16.0 mm (0.6 in)
1945	32.0 mm (1.3 in)
1946	29.5 mm (1.2 in)
1947	24.1 mm (0.9 in)
1948	26.4 mm (1.0 in)
1949	19.8 mm (0.8 in)
1950	35.1 mm (1.4 in)
1951	24.6 mm (1.0 in)
1952	16.0 mm (0.6 in)
1953	17.3 mm (0.7 in)
1954	17.0 mm (0.7 in)
1955	21.3 mm (0.8 in)
1956	22.1 mm (0.9 in)
1957	22.4 mm (0.9 in)
1958	22.9 mm (0.9 in)
1959	22.6 mm (0.9 in)
1960	19.6 mm (0.8 in)
1961	17.5 mm (0.7 in)
1962	24.4 mm (1.0 in)
1963	16.5 mm (0.6 in)
1964	24.4 mm (1.0 in)
1965	19.3 mm (0.8 in)
1966	23.4 mm (0.9 in)
1967	17.5 mm (0.7 in)
1968	17.0 mm (0.7 in)
1969	16.8 mm (0.7 in)
1970	22.1 mm (0.9 in)
1971	20.3 mm (0.8 in)
1972	31.2 mm (1.2 in)
1973	23.4 mm (0.9 in)
1974	14.2 mm (0.6 in)
1975	19.3 mm (0.8 in)
1976	16.8 mm (0.7 in)
1977	26.7 mm (1.1 in)
1978	25.1 mm (1.0 in)
1979	22.6 mm (0.9 in)
1980	24.4 mm (1.0 in)
1981	18.3 mm (0.7 in)
1982	38.1 mm (1.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Sprague, 1899 to 1982. The record is 82.3 mm (3.2 in) in 1927, marked on the chart; the median year is 38.2 mm (1.5 in).

Wettest five days (Rx5day) at Sprague by year
Year	Wettest five days (Rx5day)
1899	8.7 mm (0.34 in)
1900	30.5 mm (1.2 in)
1901	61.0 mm (2.4 in)
1902	81.3 mm (3.2 in)
1903	45.7 mm (1.8 in)
1904	30.5 mm (1.2 in)
1905	63.5 mm (2.5 in)
1914	18.8 mm (0.7 in)
1915	48.3 mm (1.9 in)
1916	42.4 mm (1.7 in)
1917	38.8 mm (1.5 in)
1918	26.8 mm (1.1 in)
1919	27.9 mm (1.1 in)
1926	37.4 mm (1.5 in)
1927	82.3 mm (3.2 in)
1928	36.3 mm (1.4 in)
1929	32.8 mm (1.3 in)
1930	38.6 mm (1.5 in)
1931	55.1 mm (2.2 in)
1932	34.5 mm (1.4 in)
1933	43.2 mm (1.7 in)
1934	47.5 mm (1.9 in)
1935	30.5 mm (1.2 in)
1936	42.8 mm (1.7 in)
1937	39.6 mm (1.6 in)
1938	33.3 mm (1.3 in)
1939	25.8 mm (1.0 in)
1940	45.1 mm (1.8 in)
1941	38.3 mm (1.5 in)
1942	42.6 mm (1.7 in)
1943	39.2 mm (1.5 in)
1944	27.2 mm (1.1 in)
1945	61.0 mm (2.4 in)
1946	34.0 mm (1.3 in)
1947	57.4 mm (2.3 in)
1948	31.5 mm (1.2 in)
1949	27.4 mm (1.1 in)
1950	49.8 mm (2.0 in)
1951	40.1 mm (1.6 in)
1952	33.8 mm (1.3 in)
1953	40.7 mm (1.6 in)
1954	28.7 mm (1.1 in)
1955	37.3 mm (1.5 in)
1956	29.3 mm (1.2 in)
1957	35.3 mm (1.4 in)
1958	43.9 mm (1.7 in)
1959	54.0 mm (2.1 in)
1960	50.7 mm (2.0 in)
1961	50.3 mm (2.0 in)
1962	35.5 mm (1.4 in)
1963	50.3 mm (2.0 in)
1964	43.4 mm (1.7 in)
1965	35.1 mm (1.4 in)
1966	47.7 mm (1.9 in)
1967	37.4 mm (1.5 in)
1968	42.9 mm (1.7 in)
1969	31.5 mm (1.2 in)
1970	53.1 mm (2.1 in)
1971	33.3 mm (1.3 in)
1972	41.1 mm (1.6 in)
1973	45.5 mm (1.8 in)
1974	34.2 mm (1.3 in)
1975	26.6 mm (1.0 in)
1976	25.4 mm (1.0 in)
1977	58.2 mm (2.3 in)
1978	33.7 mm (1.3 in)
1979	27.4 mm (1.1 in)
1980	36.8 mm (1.4 in)
1981	29.6 mm (1.2 in)
1982	38.1 mm (1.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Sprague, 1899 to 1982. The record is 99 days in 1929, marked on the chart; the median year is 42 days.

Longest dry spell (CDD) at Sprague by year
Year	Longest dry spell (CDD)
1899	82 days
1900	79 days
1901	49 days
1902	40 days
1903	32 days
1904	84 days
1905	60 days
1914	55 days
1915	48 days
1916	37 days
1917	78 days
1918	40 days
1919	69 days
1926	20 days
1927	56 days
1928	54 days
1929	99 days
1930	36 days
1931	37 days
1932	50 days
1933	31 days
1934	59 days
1935	37 days
1936	53 days
1937	35 days
1938	48 days
1939	59 days
1940	48 days
1941	34 days
1942	27 days
1943	37 days
1944	33 days
1945	73 days
1946	47 days
1947	28 days
1948	30 days
1949	56 days
1950	41 days
1951	53 days
1952	49 days
1953	21 days
1954	19 days
1955	48 days
1956	32 days
1957	43 days
1958	28 days
1959	61 days
1960	45 days
1961	38 days
1962	51 days
1963	26 days
1964	28 days
1965	35 days
1966	53 days
1967	75 days
1968	43 days
1969	76 days
1970	31 days
1971	42 days
1972	34 days
1973	40 days
1974	52 days
1975	31 days
1976	36 days
1977	30 days
1978	36 days
1979	42 days
1980	22 days
1981	25 days
1982	35 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

28 years with a frost

Across 28 years with a frost, the median last spring frost at Sprague falls on 19 May and the median first autumn frost on 18 September, which leaves a median of 124 days between them.

Fitted over all years, the growing season changes by -8.0 days per decade at this station.

Frost dates and growing season at Sprague
Measure	Median, all years	Earliest period	Recent period (1940 to 1980)	Recent against earliest	Fitted trend
Last spring frost	19 May	n/a	19 May	n/a	+4.4 days per decade
First autumn frost	18 September	n/a	18 September	n/a	-3.6 days per decade
Growing days	124 days	n/a	124 days	n/a	-8.0 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

52 years, 1900 to 1980

A day with at least 22.0 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 42.4 mm (1.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Sprague: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	22.0 mm (0.9 in)
5 years	27.0 mm (1.1 in)
10 years	30.5 mm (1.2 in)
25 years	35.1 mm (1.4 in)
50 years	38.7 mm (1.5 in)
100 years	42.4 mm (1.7 in)	Longer than the 52 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, 52 years of values from 1900 to 1980.

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: 50.8 mm (2.0 in) in 1901; 35.1 mm (1.4 in) in 1950; 32.0 mm (1.3 in) in 1945.

Download the Data

Data for Sprague standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Sprague 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 2026-10-14 (14 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).