Roy 8 NE Weather Records (USC00247228)

Record envelope, standing records and threshold days for Roy 8 NE (USC00247228), Montana, United States, with 68 years of record.

Key Facts for Roy 8 NE

Roy 8 NE (USC00247228) is a weather station in Montana, United States at 47.49 latitude and -108.84 longitude, 940 m (3,085 ft) above sea level.
The station reports from 1938 to 2005, 68 years of record.
1,464 records set at Roy 8 NE still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Roy 8 NE tied a daily record high maximum temperature of 24.4 C (75.9 F) on 13 April 2005.

About the Station

Location: Montana, United States, 47.49 latitude, -108.84 longitude.
Elevation: 940 m (3,085 ft).
Period of record: 1938 to 2005, 68 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 Roy 8 NE. 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 Roy 8 NE, 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)	-40.6 C (-41.1 F)	n/a	n/a
Feb	22.2 C (72.0 F)	-39.4 C (-38.9 F)	n/a	n/a
Mar	27.2 C (81.0 F)	-36.1 C (-33.0 F)	n/a	n/a
Apr	32.2 C (90.0 F)	-20.6 C (-5.1 F)	n/a	n/a
May	35.6 C (96.1 F)	-12.2 C (10.0 F)	n/a	n/a
Jun	39.4 C (102.9 F)	-1.7 C (28.9 F)	n/a	n/a
Jul	40.6 C (105.1 F)	1.7 C (35.1 F)	n/a	n/a
Aug	41.7 C (107.1 F)	-1.1 C (30.0 F)	n/a	n/a
Sep	39.4 C (102.9 F)	-8.9 C (16.0 F)	n/a	n/a
Oct	33.3 C (91.9 F)	-23.9 C (-11.0 F)	n/a	n/a
Nov	25.6 C (78.1 F)	-33.9 C (-29.0 F)	n/a	n/a
Dec	20.6 C (69.1 F)	-45.0 C (-49.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Roy 8 NE still stand. 1992 holds the most, with 47.

Standing records at Roy 8 NE by the year they were set
Year set	Standing records
1942	22
1943	34
1944	11
1945	32
1946	12
1947	24
1948	21
1949	32
1950	46
1951	43
1952	14
1953	15
1954	38
1955	20
1956	20
1957	15
1958	19
1959	30
1960	25
1961	15
1962	20
1963	22
1964	16
1965	27
1966	20
1967	22
1968	19
1969	31
1970	17
1971	18
1972	36
1973	21
1974	14
1975	17
1976	14
1977	20
1978	11
1979	18
1980	26
1981	16
1982	16
1983	27
1984	25
1985	41
1986	26
1987	27
1988	35
1989	22
1990	21
1991	31
1992	47
1993	18
1994	14
1995	16
1996	28
1997	28
1998	14
1999	19
2000	11
2001	14
2002	38
2003	27
2004	16
2005	10

All-Time Record Progression

17 new records

17 all-time records were set at Roy 8 NE between 8 January 1978 and 13 August 2001. Each dot is a new record.

When Roy 8 NE set new all-time records
Date	Kind	Detail
1978-01-08	Record snow depth	Record snow depth 78.7 cm (31.0 in)
1978-01-24	Record snow depth	Record snow depth 81.3 cm (32.0 in)
1978-01-25	Record snow depth	Record snow depth 88.9 cm (35.0 in)
1978-01-26	Record snow depth	Record snow depth 96.5 cm (38.0 in)
1978-01-27	Record snow depth	Record snow depth 104.1 cm (41.0 in)
1978-01-29	Record snow depth	Record snow depth 106.7 cm (42.0 in)
1978-02-02	Record snow depth	Record snow depth 111.8 cm (44.0 in)
1978-02-07	Record snow depth	Record snow depth 116.8 cm (46.0 in)
1978-02-09	Record snow depth	Record snow depth 119.4 cm (47.0 in)
1978-02-11	Record snow depth	Record snow depth 132.1 cm (52.0 in)
1978-02-13	Record snow depth	Record snow depth 142.2 cm (56.0 in)
1978-09-12	Record daily precipitation	Record daily precipitation 56.9 mm (2.2 in)
1988-05-07	Record daily precipitation	Record daily precipitation 66.0 mm (2.6 in)
1989-02-02	Record low maximum temperature	Record low maximum temperature -32.2 C (-26.0 F)
1989-12-22	Record low minimum temperature	Record low minimum temperature -45.0 C (-49.0 F)
1991-06-21	Record daily precipitation	Record daily precipitation 68.8 mm (2.7 in)
2001-08-13	Record high minimum temperature	Record high minimum temperature 24.4 C (75.9 F)

Wettest Day of Each Month

Jun: 68.8 mm (2.7 in)

The wettest day on record for each calendar month at Roy 8 NE. The most was 68.8 mm (2.7 in) on 21 June 1991.

Record daily precipitation for each month at Roy 8 NE
Month	Record daily precipitation (mm)	Date
Jan	16.8 mm (0.7 in)	30 January 1971
Feb	18.3 mm (0.7 in)	22 February 1982
Mar	40.6 mm (1.6 in)	29 March 1977
Apr	49.3 mm (1.9 in)	3 April 1955
May	66.0 mm (2.6 in)	7 May 1988
Jun	68.8 mm (2.7 in)	21 June 1991
Jul	55.1 mm (2.2 in)	11 July 1948
Aug	55.6 mm (2.2 in)	3 August 1985
Sep	56.9 mm (2.2 in)	12 September 1978
Oct	41.1 mm (1.6 in)	17 October 1938
Nov	18.0 mm (0.7 in)	18 November 1941
Dec	16.8 mm (0.7 in)	27 December 2003

Period of Record Coverage

1942 to 2005

64 years of record at Roy 8 NE, 1942 to 2005. 2 years have data for under 90 percent of days and are left out of rankings: 2004, 2005.

Days with data per year at Roy 8 NE
Year	Days with data	Share of year	Complete
1942	347	95%	Yes
1943	364	100%	Yes
1944	366	100%	Yes
1945	363	99%	Yes
1946	364	100%	Yes
1947	365	100%	Yes
1948	359	98%	Yes
1949	365	100%	Yes
1950	363	99%	Yes
1951	364	100%	Yes
1952	363	99%	Yes
1953	363	99%	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	365	100%	Yes
1961	364	100%	Yes
1962	365	100%	Yes
1963	363	99%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	364	100%	Yes
1967	365	100%	Yes
1968	364	99%	Yes
1969	364	100%	Yes
1970	363	99%	Yes
1971	365	100%	Yes
1972	365	100%	Yes
1973	364	100%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	364	99%	Yes
1981	365	100%	Yes
1982	363	99%	Yes
1983	363	99%	Yes
1984	365	100%	Yes
1985	364	100%	Yes
1986	365	100%	Yes
1987	365	100%	Yes
1988	366	100%	Yes
1989	364	100%	Yes
1990	365	100%	Yes
1991	364	100%	Yes
1992	362	99%	Yes
1993	362	99%	Yes
1994	365	100%	Yes
1995	364	100%	Yes
1996	365	100%	Yes
1997	364	100%	Yes
1998	361	99%	Yes
1999	362	99%	Yes
2000	364	99%	Yes
2001	357	98%	Yes
2002	344	94%	Yes
2003	329	90%	Yes
2004	314	86%	No
2005	116	32%	No

Latest Records

Latest records at Roy 8 NE
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
13 April 2005	Roy 8 NE, US	daily high max (Tie)	24.4 C (75.9 F)	tie	47 years	5 of 100 (Routine)
9 April 2005	Roy 8 NE, US	daily rain	10.9 mm (0.4 in)	1.8 mm (0.07 in)	6 years	9 of 100 (Routine)
8 April 2005	Roy 8 NE, US	daily high min	8.9 C (48.0 F)	3.3 C (5.9 F)	8 years	15 of 100 (Routine)
7 April 2005	Roy 8 NE, US	daily high max	28.3 C (82.9 F)	5.5 C (9.9 F)	62 years	32 of 100 (Routine)
4 April 2005	Roy 8 NE, US	daily high min (Tie)	4.4 C (39.9 F)	tie	46 years	4 of 100 (Routine)
24 March 2005	Roy 8 NE, US	daily snowfall	7.6 cm (3.0 in)	5.1 cm (2.0 in)	23 years	21 of 100 (Routine)
24 March 2005	Roy 8 NE, US	daily rain (Tie)	6.1 mm (0.24 in)	tie	20 years	3 of 100 (Routine)
5 March 2005	Roy 8 NE, US	daily high min (Tie)	4.4 C (39.9 F)	tie	31 years	3 of 100 (Routine)
13 February 2005	Roy 8 NE, US	daily high min (Tie)	1.7 C (35.1 F)	tie	58 years	5 of 100 (Routine)
11 February 2005	Roy 8 NE, US	daily high max	19.4 C (66.9 F)	3.3 C (5.9 F)	14 years	13 of 100 (Routine)
4 February 2005	Roy 8 NE, US	daily high min	4.4 C (39.9 F)	2.7 C (4.9 F)	42 years	21 of 100 (Routine)
4 February 2005	Roy 8 NE, US	daily high max (Tie)	17.2 C (63.0 F)	tie	14 years	2 of 100 (Routine)
24 January 2005	Roy 8 NE, US	daily high min	3.9 C (39.0 F)	2.2 C (4.0 F)	37 years	19 of 100 (Routine)
24 January 2005	Roy 8 NE, US	daily high max	20.0 C (68.0 F)	1.7 C (3.1 F)	37 years	18 of 100 (Routine)
23 January 2005	Roy 8 NE, US	daily high max	20.0 C (68.0 F)	2.2 C (4.0 F)	24 years	15 of 100 (Routine)
20 January 2005	Roy 8 NE, US	daily high min	6.7 C (44.1 F)	5.0 C (9.0 F)	38 years	22 of 100 (Routine)
19 January 2005	Roy 8 NE, US	daily high max	17.2 C (63.0 F)	1.1 C (2.0 F)	19 years	12 of 100 (Routine)
18 January 2005	Roy 8 NE, US	daily high min	4.4 C (39.9 F)	3.8 C (6.8 F)	58 years	26 of 100 (Routine)
31 December 2004	Roy 8 NE, US	daily rain	4.6 mm (0.18 in)	2.6 mm (0.10 in)	60 years	20 of 100 (Routine)
31 December 2004	Roy 8 NE, US	daily snowfall	6.4 cm (2.5 in)	1.3 cm (0.5 in)	28 years	16 of 100 (Routine)

Climate Trend

61 complete years, 1943 to 2004

One stripe for each of 61 complete years at Roy 8 NE, 1943 to 2004. Blue stripes are years cooler than the station's own mean of 6.8 C (44.3 F); red stripes are warmer. The coolest year was 1950, at 4.3 C (39.7 F), and the warmest was 1999, at 8.6 C (47.5 F). The strongest colour marks a difference of 2.6 C (4.7 F).

Annual mean temperature at Roy 8 NE as warming stripes, 1943 to 2004
Year	Annual mean temperature	Difference from the station mean
1943	6.4 C	-0.40 C
1944	6.5 C	-0.31 C
1945	5.8 C	-1.04 C
1946	6.5 C	-0.30 C
1947	6.2 C	-0.63 C
1948	6.9 C	+0.07 C
1949	6.0 C	-0.86 C
1950	4.3 C	-2.55 C
1952	7.2 C	+0.35 C
1953	8.6 C	+1.77 C
1954	6.8 C	-0.02 C
1955	5.6 C	-1.24 C
1956	7.1 C	+0.27 C
1957	6.5 C	-0.30 C
1958	7.4 C	+0.53 C
1959	5.9 C	-0.98 C
1960	6.4 C	-0.42 C
1961	7.7 C	+0.91 C
1962	7.1 C	+0.22 C
1963	7.9 C	+1.05 C
1964	6.4 C	-0.43 C
1965	5.7 C	-1.15 C
1966	6.2 C	-0.60 C
1967	7.0 C	+0.12 C
1968	6.4 C	-0.48 C
1969	5.3 C	-1.58 C
1970	6.4 C	-0.47 C
1971	6.3 C	-0.50 C
1972	5.6 C	-1.23 C
1973	7.6 C	+0.74 C
1974	7.8 C	+0.96 C
1975	5.6 C	-1.25 C
1976	8.3 C	+1.49 C
1977	6.8 C	-0.01 C
1978	4.6 C	-2.23 C
1979	5.9 C	-0.93 C
1980	7.5 C	+0.71 C
1981	8.3 C	+1.49 C
1982	5.2 C	-1.68 C
1983	7.5 C	+0.67 C
1984	7.4 C	+0.55 C
1985	5.4 C	-1.42 C
1986	7.6 C	+0.75 C
1987	8.4 C	+1.59 C
1988	7.6 C	+0.76 C
1989	5.7 C	-1.09 C
1990	7.7 C	+0.89 C
1991	8.1 C	+1.23 C
1992	8.2 C	+1.32 C
1993	5.7 C	-1.17 C
1994	7.2 C	+0.39 C
1995	6.7 C	-0.10 C
1996	5.2 C	-1.65 C
1997	7.5 C	+0.66 C
1998	8.2 C	+1.37 C
1999	8.6 C	+1.80 C
2000	7.3 C	+0.48 C
2001	8.4 C	+1.60 C
2002	6.8 C	-0.05 C
2003	8.2 C	+1.39 C
2004	7.9 C	+1.04 C

The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1943 to 2004. In Fahrenheit: 0.4 F (0.1 to 0.6) per decade. The slope is a straight line fitted to 61 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Roy 8 NE
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.2 C (0.1 to 0.3) per decade	0.4 F (0.1 to 0.6) per decade	1943 to 2004	61	Rise
Mean daily maximum	0.20 C (0.02 to 0.37) per decade	0.35 F (0.04 to 0.67) per decade	1943 to 2004	61	Rise
Mean daily minimum	0.2 C (0.1 to 0.3) per decade	0.4 F (0.1 to 0.6) per decade	1943 to 2004	61	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

1938 to 2005

Yearly extremes at Roy 8 NE: 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)	1961	38.3 C (100.9 F)	64
Coldest night (TNn)	-45.0 C (-49.0 F)	1989	-32.8 C (-27.0 F)	64
Wettest day (Rx1day)	68.8 mm (2.7 in)	1991	34.0 mm (1.3 in)	68
Wettest five days (Rx5day)	102.1 mm (4.0 in)	1978	51.2 mm (2.0 in)	68
Longest dry spell (CDD)	69 days	2004	35 days	68

Hottest day (TXx)

The hottest day of the year at Roy 8 NE, 1938 to 2005. The record is 41.7 C (107.1 F) in 1961, marked on the chart; the median year is 38.3 C (100.9 F).

Hottest day (TXx) at Roy 8 NE by year
Year	Hottest day (TXx)
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	36.7 C (98.1 F)
1943	37.8 C (100.0 F)
1944	35.0 C (95.0 F)
1945	38.9 C (102.0 F)
1946	37.2 C (99.0 F)
1947	40.0 C (104.0 F)
1948	37.8 C (100.0 F)
1949	41.1 C (106.0 F)
1950	36.7 C (98.1 F)
1951	40.0 C (104.0 F)
1952	38.3 C (100.9 F)
1953	39.4 C (102.9 F)
1954	38.3 C (100.9 F)
1955	40.6 C (105.1 F)
1956	37.2 C (99.0 F)
1957	38.3 C (100.9 F)
1958	36.7 C (98.1 F)
1959	38.3 C (100.9 F)
1960	39.4 C (102.9 F)
1961	41.7 C (107.1 F)
1962	35.0 C (95.0 F)
1963	40.6 C (105.1 F)
1964	38.9 C (102.0 F)
1965	37.8 C (100.0 F)
1966	39.4 C (102.9 F)
1967	36.7 C (98.1 F)
1968	35.6 C (96.1 F)
1969	40.6 C (105.1 F)
1970	37.8 C (100.0 F)
1971	40.0 C (104.0 F)
1972	35.6 C (96.1 F)
1973	38.3 C (100.9 F)
1974	35.6 C (96.1 F)
1975	38.3 C (100.9 F)
1976	38.3 C (100.9 F)
1977	35.0 C (95.0 F)
1978	36.1 C (97.0 F)
1979	37.2 C (99.0 F)
1980	37.8 C (100.0 F)
1981	38.3 C (100.9 F)
1982	36.7 C (98.1 F)
1983	41.7 C (107.1 F)
1984	39.4 C (102.9 F)
1985	38.3 C (100.9 F)
1986	36.7 C (98.1 F)
1987	36.7 C (98.1 F)
1988	38.9 C (102.0 F)
1989	37.8 C (100.0 F)
1990	38.3 C (100.9 F)
1991	38.9 C (102.0 F)
1992	36.7 C (98.1 F)
1993	32.8 C (91.0 F)
1994	37.8 C (100.0 F)
1995	37.8 C (100.0 F)
1996	38.3 C (100.9 F)
1997	36.7 C (98.1 F)
1998	37.8 C (100.0 F)
1999	38.9 C (102.0 F)
2000	38.3 C (100.9 F)
2001	39.4 C (102.9 F)
2002	40.0 C (104.0 F)
2003	40.6 C (105.1 F)
2004	38.3 C (100.9 F)
2005	28.3 C (82.9 F)

Coldest night (TNn)

The coldest night of the year at Roy 8 NE, 1938 to 2005. The record is -45.0 C (-49.0 F) in 1989, marked on the chart; the median year is -32.8 C (-27.0 F).

Coldest night (TNn) at Roy 8 NE by year
Year	Coldest night (TNn)
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	-27.2 C (-17.0 F)
1943	-38.9 C (-38.0 F)
1944	-28.9 C (-20.0 F)
1945	-32.8 C (-27.0 F)
1946	-28.3 C (-18.9 F)
1947	-33.3 C (-27.9 F)
1948	-32.2 C (-26.0 F)
1949	-37.2 C (-35.0 F)
1950	-38.3 C (-36.9 F)
1951	-33.3 C (-27.9 F)
1952	-33.3 C (-27.9 F)
1953	-24.4 C (-11.9 F)
1954	-40.0 C (-40.0 F)
1955	-32.8 C (-27.0 F)
1956	-32.2 C (-26.0 F)
1957	-40.0 C (-40.0 F)
1958	-28.9 C (-20.0 F)
1959	-33.9 C (-29.0 F)
1960	-35.0 C (-31.0 F)
1961	-29.4 C (-20.9 F)
1962	-32.8 C (-27.0 F)
1963	-34.4 C (-29.9 F)
1964	-34.4 C (-29.9 F)
1965	-30.0 C (-22.0 F)
1966	-32.2 C (-26.0 F)
1967	-30.0 C (-22.0 F)
1968	-36.1 C (-33.0 F)
1969	-40.6 C (-41.1 F)
1970	-35.0 C (-31.0 F)
1971	-31.7 C (-25.1 F)
1972	-37.2 C (-35.0 F)
1973	-26.7 C (-16.1 F)
1974	-35.0 C (-31.0 F)
1975	-31.7 C (-25.1 F)
1976	-32.8 C (-27.0 F)
1977	-36.1 C (-33.0 F)
1978	-33.9 C (-29.0 F)
1979	-35.6 C (-32.1 F)
1980	-31.1 C (-24.0 F)
1981	-31.1 C (-24.0 F)
1982	-34.4 C (-29.9 F)
1983	-38.9 C (-38.0 F)
1984	-34.4 C (-29.9 F)
1985	-38.3 C (-36.9 F)
1986	-28.3 C (-18.9 F)
1987	-23.9 C (-11.0 F)
1988	-31.7 C (-25.1 F)
1989	-45.0 C (-49.0 F)
1990	-36.7 C (-34.1 F)
1991	-30.6 C (-23.1 F)
1992	-34.4 C (-29.9 F)
1993	-32.2 C (-26.0 F)
1994	-37.8 C (-36.0 F)
1995	-30.0 C (-22.0 F)
1996	-39.4 C (-38.9 F)
1997	-40.6 C (-41.1 F)
1998	-35.6 C (-32.1 F)
1999	-22.8 C (-9.0 F)
2000	-30.6 C (-23.1 F)
2001	-27.8 C (-18.0 F)
2002	-30.6 C (-23.1 F)
2003	-31.1 C (-24.0 F)
2004	-30.6 C (-23.1 F)
2005	-31.1 C (-24.0 F)

Wettest day (Rx1day)

The wettest day of the year at Roy 8 NE, 1938 to 2005. The record is 68.8 mm (2.7 in) in 1991, marked on the chart; the median year is 34.0 mm (1.3 in).

Wettest day (Rx1day) at Roy 8 NE by year
Year	Wettest day (Rx1day)
1938	46.2 mm (1.8 in)
1939	25.9 mm (1.0 in)
1940	34.0 mm (1.3 in)
1941	36.8 mm (1.4 in)
1942	38.9 mm (1.5 in)
1943	48.3 mm (1.9 in)
1944	54.1 mm (2.1 in)
1945	15.7 mm (0.6 in)
1946	29.5 mm (1.2 in)
1947	17.5 mm (0.7 in)
1948	55.1 mm (2.2 in)
1949	24.6 mm (1.0 in)
1950	21.6 mm (0.9 in)
1951	27.9 mm (1.1 in)
1952	18.5 mm (0.7 in)
1953	42.4 mm (1.7 in)
1954	46.5 mm (1.8 in)
1955	49.3 mm (1.9 in)
1956	26.4 mm (1.0 in)
1957	23.4 mm (0.9 in)
1958	25.4 mm (1.0 in)
1959	30.2 mm (1.2 in)
1960	29.0 mm (1.1 in)
1961	28.2 mm (1.1 in)
1962	43.4 mm (1.7 in)
1963	33.0 mm (1.3 in)
1964	39.9 mm (1.6 in)
1965	35.6 mm (1.4 in)
1966	23.4 mm (0.9 in)
1967	37.8 mm (1.5 in)
1968	39.4 mm (1.6 in)
1969	42.4 mm (1.7 in)
1970	37.8 mm (1.5 in)
1971	17.3 mm (0.7 in)
1972	34.0 mm (1.3 in)
1973	48.0 mm (1.9 in)
1974	50.3 mm (2.0 in)
1975	45.7 mm (1.8 in)
1976	39.1 mm (1.5 in)
1977	40.6 mm (1.6 in)
1978	56.9 mm (2.2 in)
1979	13.2 mm (0.5 in)
1980	23.6 mm (0.9 in)
1981	29.2 mm (1.1 in)
1982	41.9 mm (1.6 in)
1983	33.3 mm (1.3 in)
1984	17.3 mm (0.7 in)
1985	55.6 mm (2.2 in)
1986	42.4 mm (1.7 in)
1987	20.8 mm (0.8 in)
1988	66.0 mm (2.6 in)
1989	37.8 mm (1.5 in)
1990	50.3 mm (2.0 in)
1991	68.8 mm (2.7 in)
1992	25.9 mm (1.0 in)
1993	33.3 mm (1.3 in)
1994	36.1 mm (1.4 in)
1995	46.2 mm (1.8 in)
1996	21.6 mm (0.9 in)
1997	53.8 mm (2.1 in)
1998	18.3 mm (0.7 in)
1999	29.2 mm (1.1 in)
2000	33.5 mm (1.3 in)
2001	44.5 mm (1.8 in)
2002	24.9 mm (1.0 in)
2003	27.9 mm (1.1 in)
2004	21.1 mm (0.8 in)
2005	10.9 mm (0.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at Roy 8 NE, 1938 to 2005. The record is 102.1 mm (4.0 in) in 1978, marked on the chart; the median year is 51.2 mm (2.0 in).

Wettest five days (Rx5day) at Roy 8 NE by year
Year	Wettest five days (Rx5day)
1938	66.6 mm (2.6 in)
1939	59.0 mm (2.3 in)
1940	60.4 mm (2.4 in)
1941	36.8 mm (1.4 in)
1942	58.4 mm (2.3 in)
1943	78.3 mm (3.1 in)
1944	87.9 mm (3.5 in)
1945	45.9 mm (1.8 in)
1946	38.8 mm (1.5 in)
1947	42.9 mm (1.7 in)
1948	80.2 mm (3.2 in)
1949	35.3 mm (1.4 in)
1950	30.7 mm (1.2 in)
1951	37.9 mm (1.5 in)
1952	23.1 mm (0.9 in)
1953	84.1 mm (3.3 in)
1954	62.0 mm (2.4 in)
1955	83.4 mm (3.3 in)
1956	35.6 mm (1.4 in)
1957	49.0 mm (1.9 in)
1958	31.8 mm (1.3 in)
1959	42.7 mm (1.7 in)
1960	35.0 mm (1.4 in)
1961	54.6 mm (2.1 in)
1962	100.0 mm (3.9 in)
1963	49.8 mm (2.0 in)
1964	80.3 mm (3.2 in)
1965	53.9 mm (2.1 in)
1966	40.9 mm (1.6 in)
1967	66.7 mm (2.6 in)
1968	68.4 mm (2.7 in)
1969	90.1 mm (3.5 in)
1970	51.9 mm (2.0 in)
1971	34.8 mm (1.4 in)
1972	45.2 mm (1.8 in)
1973	55.9 mm (2.2 in)
1974	75.5 mm (3.0 in)
1975	67.6 mm (2.7 in)
1976	46.5 mm (1.8 in)
1977	51.3 mm (2.0 in)
1978	102.1 mm (4.0 in)
1979	19.0 mm (0.7 in)
1980	39.9 mm (1.6 in)
1981	53.1 mm (2.1 in)
1982	54.4 mm (2.1 in)
1983	38.7 mm (1.5 in)
1984	36.3 mm (1.4 in)
1985	61.7 mm (2.4 in)
1986	63.7 mm (2.5 in)
1987	38.4 mm (1.5 in)
1988	66.0 mm (2.6 in)
1989	45.7 mm (1.8 in)
1990	53.1 mm (2.1 in)
1991	85.5 mm (3.4 in)
1992	51.0 mm (2.0 in)
1993	48.3 mm (1.9 in)
1994	47.5 mm (1.9 in)
1995	54.6 mm (2.1 in)
1996	48.2 mm (1.9 in)
1997	90.6 mm (3.6 in)
1998	31.8 mm (1.3 in)
1999	36.8 mm (1.4 in)
2000	39.6 mm (1.6 in)
2001	59.0 mm (2.3 in)
2002	33.3 mm (1.3 in)
2003	33.5 mm (1.3 in)
2004	54.6 mm (2.1 in)
2005	11.2 mm (0.4 in)

Longest dry spell (CDD)

The longest dry spell of the year at Roy 8 NE, 1938 to 2005. The record is 69 days in 2004, marked on the chart; the median year is 35 days.

Longest dry spell (CDD) at Roy 8 NE by year
Year	Longest dry spell (CDD)
1938	35 days
1939	38 days
1940	34 days
1941	32 days
1942	39 days
1943	53 days
1944	46 days
1945	57 days
1946	39 days
1947	29 days
1948	35 days
1949	61 days
1950	36 days
1951	28 days
1952	65 days
1953	29 days
1954	67 days
1955	52 days
1956	36 days
1957	33 days
1958	38 days
1959	38 days
1960	42 days
1961	27 days
1962	33 days
1963	37 days
1964	22 days
1965	45 days
1966	23 days
1967	51 days
1968	38 days
1969	39 days
1970	34 days
1971	28 days
1972	25 days
1973	48 days
1974	32 days
1975	18 days
1976	35 days
1977	30 days
1978	27 days
1979	27 days
1980	33 days
1981	38 days
1982	34 days
1983	29 days
1984	29 days
1985	40 days
1986	25 days
1987	55 days
1988	32 days
1989	14 days
1990	36 days
1991	52 days
1992	65 days
1993	24 days
1994	55 days
1995	46 days
1996	52 days
1997	35 days
1998	27 days
1999	31 days
2000	35 days
2001	39 days
2002	52 days
2003	34 days
2004	69 days
2005	30 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

61 years with a frost

Across 61 years with a frost, the median last spring frost at Roy 8 NE falls on 18 May and the median first autumn frost on 18 September, which leaves a median of 123 days between them.

In 1975 to 2004 the median growing season was 128 days. That is 6 days more than in 1943 to 1973.

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

Frost dates and growing season at Roy 8 NE
Measure	Median, all years	Earliest period (1943 to 1973)	Recent period (1975 to 2004)	Recent against earliest	Fitted trend
Last spring frost	18 May	19 May	15 May	4 days earlier	-0.8 days per decade
First autumn frost	18 September	18 September	20 September	2 days later	+0.6 days per decade
Growing days	123 days	122 days	128 days	6 days more	+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

66 years, 1939 to 2004

A day with at least 34.1 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 69.9 mm (2.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Roy 8 NE: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	34.1 mm (1.3 in)
5 years	45.7 mm (1.8 in)
10 years	52.5 mm (2.1 in)
25 years	60.2 mm (2.4 in)
50 years	65.3 mm (2.6 in)
100 years	69.9 mm (2.8 in)	Longer than the 66 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, 66 years of values from 1939 to 2004.

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: 68.8 mm (2.7 in) in 1991; 66.0 mm (2.6 in) in 1988; 56.9 mm (2.2 in) in 1978.

Station Changes

1 suspected

One change was suspected in the annual mean temperature of Roy 8 NE, at 1991. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 1991 ran 0.3 C (0.5 F) higher than in the years before (possible change).

Suspected changes in the annual mean temperature at Roy 8 NE, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
1991	+0.3	+0.5	possible	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 Roy 8 NE standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Roy 8 NE 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).