Plains Rs Weather Records (USC00246562)

Record envelope, standing records and threshold days for Plains Rs (USC00246562), Montana, United States, with 54 years of record.

Key Facts for Plains Rs

Plains Rs (USC00246562) is a weather station in Montana, United States at 47.47 latitude and -114.88 longitude, 759 m (2,490 ft) above sea level.
The station reports from 1898 to 1951, 54 years of record.
1,464 records set at Plains Rs still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.

About the Station

Location: Montana, United States, 47.47 latitude, -114.88 longitude.
Elevation: 759 m (2,490 ft).
Period of record: 1898 to 1951, 54 years.
Eligible elements: prcp.

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 Plains Rs. 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 Plains Rs, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	17.8 C (64.0 F)	-30.0 C (-22.0 F)	n/a	n/a
Feb	17.8 C (64.0 F)	-31.7 C (-25.1 F)	n/a	n/a
Mar	21.7 C (71.1 F)	-24.4 C (-11.9 F)	n/a	n/a
Apr	31.7 C (89.1 F)	-11.1 C (12.0 F)	n/a	n/a
May	32.8 C (91.0 F)	-10.0 C (14.0 F)	n/a	n/a
Jun	38.9 C (102.0 F)	-2.2 C (28.0 F)	n/a	n/a
Jul	41.1 C (106.0 F)	1.1 C (34.0 F)	n/a	n/a
Aug	38.3 C (100.9 F)	-0.6 C (30.9 F)	n/a	n/a
Sep	35.6 C (96.1 F)	-9.4 C (15.1 F)	n/a	n/a
Oct	28.9 C (84.0 F)	-15.6 C (3.9 F)	n/a	n/a
Nov	19.4 C (66.9 F)	-22.8 C (-9.0 F)	n/a	n/a
Dec	17.2 C (63.0 F)	-36.7 C (-34.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Plains Rs still stand. 1919 holds the most, with 116.

Standing records at Plains Rs by the year they were set
Year set	Standing records
1898	11
1899	71
1900	70
1901	44
1902	50
1903	40
1904	32
1905	49
1906	60
1907	41
1908	47
1909	44
1910	39
1911	36
1912	34
1913	45
1914	47
1915	27
1916	69
1917	79
1918	72
1919	116
1920	54
1921	44
1922	48
1923	37
1924	75
1925	40
1926	43

Wettest Day of Each Month

May: 58.4 mm (2.3 in)

The wettest day on record for each calendar month at Plains Rs. The most was 58.4 mm (2.3 in) on 12 May 1900.

Record daily precipitation for each month at Plains Rs
Month	Record daily precipitation (mm)	Date
Jan	30.5 mm (1.2 in)	7 January 1909
Feb	22.9 mm (0.9 in)	6 February 1916
Mar	14.2 mm (0.6 in)	30 March 1914
Apr	23.1 mm (0.9 in)	30 April 1951
May	58.4 mm (2.3 in)	12 May 1900
Jun	38.1 mm (1.5 in)	5 June 1908
Jul	50.8 mm (2.0 in)	27 July 1909
Aug	26.7 mm (1.1 in)	13 August 1906
Sep	50.8 mm (2.0 in)	4 September 1911
Oct	20.3 mm (0.8 in)	2 October 1910
Nov	31.2 mm (1.2 in)	21 November 1921
Dec	36.1 mm (1.4 in)	22 December 1917

Period of Record Coverage

1898 to 1926

29 years of record at Plains Rs, 1898 to 1926. 2 years have data for under 90 percent of days and are left out of rankings: 1898, 1921.

Days with data per year at Plains Rs
Year	Days with data	Share of year	Complete
1898	119	33%	No
1899	358	98%	Yes
1900	357	98%	Yes
1901	354	97%	Yes
1902	356	98%	Yes
1903	365	100%	Yes
1904	361	99%	Yes
1905	356	98%	Yes
1906	358	98%	Yes
1907	362	99%	Yes
1908	364	99%	Yes
1909	360	99%	Yes
1910	361	99%	Yes
1911	356	98%	Yes
1912	331	90%	Yes
1913	349	96%	Yes
1914	362	99%	Yes
1915	359	98%	Yes
1916	358	98%	Yes
1917	350	96%	Yes
1918	344	94%	Yes
1919	349	96%	Yes
1920	356	97%	Yes
1921	299	82%	No
1922	362	99%	Yes
1923	362	99%	Yes
1924	365	100%	Yes
1925	364	100%	Yes
1926	364	100%	Yes

Latest Records

No records were set at this station in the latest data.

Climate Trend

25 complete years, 1899 to 1926

One stripe for each of 25 complete years at Plains Rs, 1899 to 1926. Blue stripes are years cooler than the station's own mean of 7.5 C (45.4 F); red stripes are warmer. The coolest year was 1916, at 5.5 C (41.9 F), and the warmest was 1925, at 9.3 C (48.7 F). The strongest colour marks a difference of 2.0 C (3.6 F).

Annual mean temperature at Plains Rs as warming stripes, 1899 to 1926
Year	Annual mean temperature	Difference from the station mean
1899	6.6 C	-0.91 C
1900	8.4 C	+0.95 C
1901	7.5 C	0.00 C
1902	6.7 C	-0.76 C
1903	6.6 C	-0.86 C
1904	8.5 C	+1.06 C
1905	6.9 C	-0.54 C
1906	7.9 C	+0.41 C
1907	6.7 C	-0.76 C
1908	7.5 C	+0.07 C
1909	6.6 C	-0.85 C
1910	7.7 C	+0.20 C
1911	6.4 C	-1.07 C
1914	7.9 C	+0.38 C
1915	8.0 C	+0.53 C
1916	5.5 C	-1.99 C
1917	8.2 C	+0.74 C
1918	8.5 C	+0.98 C
1919	7.1 C	-0.40 C
1920	7.8 C	+0.29 C
1922	6.9 C	-0.58 C
1923	7.6 C	+0.17 C
1924	7.4 C	-0.09 C
1925	9.3 C	+1.79 C
1926	8.8 C	+1.28 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

1898 to 1951

Yearly extremes at Plains Rs: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	41.1 C (106.0 F)	1919	36.1 C (97.0 F)	29
Coldest night (TNn)	-36.7 C (-34.1 F)	1919	-24.4 C (-11.9 F)	29
Wettest day (Rx1day)	58.4 mm (2.3 in)	1900	23.1 mm (0.9 in)	31
Wettest five days (Rx5day)	86.3 mm (3.4 in)	1908	41.9 mm (1.6 in)	31
Longest dry spell (CDD)	74 days	1907	35 days	31

Hottest day (TXx)

The hottest day of the year at Plains Rs, 1898 to 1951. The record is 41.1 C (106.0 F) in 1919, marked on the chart; the median year is 36.1 C (97.0 F).

Hottest day (TXx) at Plains Rs by year
Year	Hottest day (TXx)
1898	27.8 C (82.0 F)
1899	36.1 C (97.0 F)
1900	35.0 C (95.0 F)
1901	35.0 C (95.0 F)
1902	33.3 C (91.9 F)
1903	34.4 C (93.9 F)
1904	35.0 C (95.0 F)
1905	36.7 C (98.1 F)
1906	36.1 C (97.0 F)
1907	32.8 C (91.0 F)
1908	38.9 C (102.0 F)
1909	33.3 C (91.9 F)
1910	35.0 C (95.0 F)
1911	33.3 C (91.9 F)
1912	36.7 C (98.1 F)
1913	34.4 C (93.9 F)
1914	37.8 C (100.0 F)
1915	35.0 C (95.0 F)
1916	34.4 C (93.9 F)
1917	38.3 C (100.9 F)
1918	38.3 C (100.9 F)
1919	41.1 C (106.0 F)
1920	40.0 C (104.0 F)
1921	37.8 C (100.0 F)
1922	37.2 C (99.0 F)
1923	37.2 C (99.0 F)
1924	38.9 C (102.0 F)
1925	37.8 C (100.0 F)
1926	38.3 C (100.9 F)
1950	n/a
1951	n/a

Coldest night (TNn)

The coldest night of the year at Plains Rs, 1898 to 1951. The record is -36.7 C (-34.1 F) in 1919, marked on the chart; the median year is -24.4 C (-11.9 F).

Coldest night (TNn) at Plains Rs by year
Year	Coldest night (TNn)
1898	-20.0 C (-4.0 F)
1899	-31.7 C (-25.1 F)
1900	-26.7 C (-16.1 F)
1901	-18.3 C (-0.9 F)
1902	-26.1 C (-15.0 F)
1903	-17.2 C (1.0 F)
1904	-15.6 C (3.9 F)
1905	-29.4 C (-20.9 F)
1906	-23.9 C (-11.0 F)
1907	-24.4 C (-11.9 F)
1908	-26.1 C (-15.0 F)
1909	-29.4 C (-20.9 F)
1910	-29.4 C (-20.9 F)
1911	-20.6 C (-5.1 F)
1912	-23.3 C (-9.9 F)
1913	-28.9 C (-20.0 F)
1914	-28.9 C (-20.0 F)
1915	-22.2 C (-8.0 F)
1916	-30.0 C (-22.0 F)
1917	-24.4 C (-11.9 F)
1918	-23.9 C (-11.0 F)
1919	-36.7 C (-34.1 F)
1920	-17.8 C (0.0 F)
1921	-24.4 C (-11.9 F)
1922	-28.9 C (-20.0 F)
1923	-30.0 C (-22.0 F)
1924	-33.9 C (-29.0 F)
1925	-12.8 C (9.0 F)
1926	-17.2 C (1.0 F)
1950	n/a
1951	n/a

Wettest day (Rx1day)

The wettest day of the year at Plains Rs, 1898 to 1951. The record is 58.4 mm (2.3 in) in 1900, marked on the chart; the median year is 23.1 mm (0.9 in).

Wettest day (Rx1day) at Plains Rs by year
Year	Wettest day (Rx1day)
1898	15.2 mm (0.6 in)
1899	15.2 mm (0.6 in)
1900	58.4 mm (2.3 in)
1901	13.5 mm (0.5 in)
1902	40.6 mm (1.6 in)
1903	22.9 mm (0.9 in)
1904	15.2 mm (0.6 in)
1905	20.8 mm (0.8 in)
1906	26.7 mm (1.1 in)
1907	21.1 mm (0.8 in)
1908	39.6 mm (1.6 in)
1909	50.8 mm (2.0 in)
1910	20.3 mm (0.8 in)
1911	50.8 mm (2.0 in)
1912	30.5 mm (1.2 in)
1913	20.3 mm (0.8 in)
1914	31.5 mm (1.2 in)
1915	22.1 mm (0.9 in)
1916	27.9 mm (1.1 in)
1917	36.1 mm (1.4 in)
1918	16.5 mm (0.6 in)
1919	21.6 mm (0.9 in)
1920	28.4 mm (1.1 in)
1921	31.2 mm (1.2 in)
1922	15.0 mm (0.6 in)
1923	30.0 mm (1.2 in)
1924	23.1 mm (0.9 in)
1925	33.5 mm (1.3 in)
1926	31.8 mm (1.3 in)
1950	16.8 mm (0.7 in)
1951	23.1 mm (0.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Plains Rs, 1898 to 1951. The record is 86.3 mm (3.4 in) in 1908, marked on the chart; the median year is 41.9 mm (1.6 in).

Wettest five days (Rx5day) at Plains Rs by year
Year	Wettest five days (Rx5day)
1898	15.3 mm (0.6 in)
1899	20.3 mm (0.8 in)
1900	81.7 mm (3.2 in)
1901	30.5 mm (1.2 in)
1902	56.0 mm (2.2 in)
1903	42.6 mm (1.7 in)
1904	26.1 mm (1.0 in)
1905	45.5 mm (1.8 in)
1906	43.5 mm (1.7 in)
1907	36.3 mm (1.4 in)
1908	86.3 mm (3.4 in)
1909	76.2 mm (3.0 in)
1910	38.2 mm (1.5 in)
1911	59.7 mm (2.4 in)
1912	30.5 mm (1.2 in)
1913	48.3 mm (1.9 in)
1914	41.7 mm (1.6 in)
1915	38.3 mm (1.5 in)
1916	60.7 mm (2.4 in)
1917	77.8 mm (3.1 in)
1918	27.4 mm (1.1 in)
1919	33.5 mm (1.3 in)
1920	45.7 mm (1.8 in)
1921	41.9 mm (1.6 in)
1922	25.7 mm (1.0 in)
1923	60.9 mm (2.4 in)
1924	41.4 mm (1.6 in)
1925	47.0 mm (1.9 in)
1926	35.6 mm (1.4 in)
1950	36.1 mm (1.4 in)
1951	45.2 mm (1.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at Plains Rs, 1898 to 1951. The record is 74 days in 1907, marked on the chart; the median year is 35 days.

Longest dry spell (CDD) at Plains Rs by year
Year	Longest dry spell (CDD)
1898	27 days
1899	47 days
1900	30 days
1901	48 days
1902	29 days
1903	23 days
1904	65 days
1905	60 days
1906	36 days
1907	74 days
1908	40 days
1909	42 days
1910	50 days
1911	53 days
1912	43 days
1913	36 days
1914	35 days
1915	21 days
1916	16 days
1917	69 days
1918	40 days
1919	29 days
1920	25 days
1921	25 days
1922	26 days
1923	22 days
1924	32 days
1925	27 days
1926	40 days
1950	25 days
1951	34 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

25 years with a frost

Across 25 years with a frost, the median last spring frost at Plains Rs falls on 6 June and the median first autumn frost on 17 September, which leaves a median of 104 days between them.

Fitted over all years, the growing season changes by -5.3 days per decade at this station.

Frost dates and growing season at Plains Rs
Measure	Median, all years	Earliest period	Recent period (1899 to 1926)	Recent against earliest	Fitted trend
Last spring frost	6 June	n/a	6 June	n/a	+1.2 days per decade
First autumn frost	17 September	n/a	17 September	n/a	-4.1 days per decade
Growing days	104 days	n/a	104 days	n/a	-5.3 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.

Download the Data

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