Hays Weather Records (USC00244020)

Record envelope, standing records and threshold days for Hays (USC00244020), Montana, United States, with 45 years of record.

Key Facts for Hays

Hays (USC00244020) is a weather station in Montana, United States at 48.00 latitude and -108.70 longitude, 1,077 m (3,533 ft) above sea level.
The station reports from 1921 to 1965, 45 years of record.
1,464 records set at Hays still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Montana, United States, 48.00 latitude, -108.70 longitude.
Elevation: 1,077 m (3,533 ft).
Period of record: 1921 to 1965, 45 years.
Eligible elements: none yet.

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 Hays. 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 Hays, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	17.2 C (63.0 F)	-48.9 C (-56.0 F)	n/a	n/a
Feb	18.3 C (64.9 F)	-41.7 C (-43.1 F)	n/a	n/a
Mar	23.9 C (75.0 F)	-37.2 C (-35.0 F)	n/a	n/a
Apr	29.4 C (84.9 F)	-23.3 C (-9.9 F)	n/a	n/a
May	33.3 C (91.9 F)	-9.4 C (15.1 F)	n/a	n/a
Jun	35.0 C (95.0 F)	-1.1 C (30.0 F)	n/a	n/a
Jul	38.9 C (102.0 F)	-6.7 C (19.9 F)	n/a	n/a
Aug	38.9 C (102.0 F)	-1.1 C (30.0 F)	n/a	n/a
Sep	34.4 C (93.9 F)	-12.2 C (10.0 F)	n/a	n/a
Oct	30.0 C (86.0 F)	-26.7 C (-16.1 F)	n/a	n/a
Nov	24.4 C (75.9 F)	-33.9 C (-29.0 F)	n/a	n/a
Dec	21.1 C (70.0 F)	-36.7 C (-34.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Hays still stand. 1925 holds the most, with 91.

Standing records at Hays by the year they were set
Year set	Standing records
1921	21
1922	29
1923	31
1924	68
1925	91
1926	76
1927	65
1928	59
1929	67
1930	18
1946	12
1947	45
1948	42
1949	60
1950	63
1951	65
1952	51
1953	52
1954	82
1955	51
1956	47
1957	37
1958	48
1959	48
1960	39
1961	58
1962	49
1963	51
1964	30
1965	9

Wettest Day of Each Month

Jun: 81.3 mm (3.2 in)

The wettest day on record for each calendar month at Hays. The most was 81.3 mm (3.2 in) on 21 June 1923.

Record daily precipitation for each month at Hays
Month	Record daily precipitation (mm)	Date
Jan	10.9 mm (0.4 in)	28 January 1959
Feb	9.1 mm (0.36 in)	20 February 1963
Mar	18.3 mm (0.7 in)	12 March 1954
Apr	25.4 mm (1.0 in)	11 April 1965
May	54.6 mm (2.1 in)	24 May 1953
Jun	81.3 mm (3.2 in)	21 June 1923
Jul	32.3 mm (1.3 in)	13 July 1948
Aug	49.5 mm (1.9 in)	20 August 1964
Sep	50.8 mm (2.0 in)	19 September 1925
Oct	30.5 mm (1.2 in)	15 October 1962
Nov	17.8 mm (0.7 in)	4 November 1951
Dec	17.8 mm (0.7 in)	29 December 1928

Period of Record Coverage

1921 to 1965

30 years of record at Hays, 1921 to 1965. 11 years have data for under 90 percent of days and are left out of rankings: 1921, 1922, 1923, 1924, 1926, 1929, 1930, 1946 and others.

Days with data per year at Hays
Year	Days with data	Share of year	Complete
1921	49	13%	No
1922	252	69%	No
1923	283	78%	No
1924	328	90%	No
1925	355	97%	Yes
1926	296	81%	No
1927	358	98%	Yes
1928	333	91%	Yes
1929	282	77%	No
1930	55	15%	No
1946	120	33%	No
1947	357	98%	Yes
1948	328	90%	No
1949	359	98%	Yes
1950	356	98%	Yes
1951	326	89%	No
1952	362	99%	Yes
1953	355	97%	Yes
1954	358	98%	Yes
1955	354	97%	Yes
1956	358	98%	Yes
1957	360	99%	Yes
1958	351	96%	Yes
1959	360	99%	Yes
1960	361	99%	Yes
1961	364	100%	Yes
1962	365	100%	Yes
1963	364	100%	Yes
1964	334	91%	Yes
1965	51	14%	No

Latest Records

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

Climate Trend

17 complete years, 1925 to 1963

One stripe for each of 17 complete years at Hays, 1925 to 1963. Blue stripes are years cooler than the station's own mean of 6.0 C (42.8 F); red stripes are warmer. The coolest year was 1950, at 4.2 C (39.6 F), and the warmest was 1953, at 7.4 C (45.2 F). The strongest colour marks a difference of 1.8 C (3.2 F).

Annual mean temperature at Hays as warming stripes, 1925 to 1963
Year	Annual mean temperature	Difference from the station mean
1925	6.4 C	+0.42 C
1927	4.8 C	-1.25 C
1947	5.8 C	-0.22 C
1949	5.8 C	-0.20 C
1950	4.2 C	-1.76 C
1952	6.2 C	+0.21 C
1953	7.4 C	+1.36 C
1954	6.0 C	-0.05 C
1955	4.6 C	-1.42 C
1956	6.5 C	+0.54 C
1957	6.0 C	-0.04 C
1958	7.0 C	+1.00 C
1959	5.6 C	-0.38 C
1960	6.2 C	+0.19 C
1961	6.8 C	+0.81 C
1962	5.9 C	-0.06 C
1963	6.9 C	+0.86 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

1921 to 1965

Yearly extremes at Hays: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	38.9 C (102.0 F)	1925	35.6 C (96.1 F)	30
Coldest night (TNn)	-48.9 C (-56.0 F)	1929	-33.6 C (-28.5 F)	30
Wettest day (Rx1day)	81.3 mm (3.2 in)	1923	27.9 mm (1.1 in)	29
Wettest five days (Rx5day)	175.2 mm (6.9 in)	1928	42.4 mm (1.7 in)	29
Longest dry spell (CDD)	59 days	1928	32 days	29

Hottest day (TXx)

The hottest day of the year at Hays, 1921 to 1965. The record is 38.9 C (102.0 F) in 1925, marked on the chart; the median year is 35.6 C (96.1 F).

Hottest day (TXx) at Hays by year
Year	Hottest day (TXx)
1921	15.6 C (60.1 F)
1922	33.9 C (93.0 F)
1923	34.4 C (93.9 F)
1924	36.1 C (97.0 F)
1925	38.9 C (102.0 F)
1926	38.9 C (102.0 F)
1927	33.3 C (91.9 F)
1928	35.6 C (96.1 F)
1929	38.9 C (102.0 F)
1930	16.7 C (62.1 F)
1946	31.7 C (89.1 F)
1947	36.7 C (98.1 F)
1948	35.0 C (95.0 F)
1949	38.9 C (102.0 F)
1950	34.4 C (93.9 F)
1951	36.1 C (97.0 F)
1952	35.6 C (96.1 F)
1953	37.2 C (99.0 F)
1954	35.0 C (95.0 F)
1955	36.7 C (98.1 F)
1956	35.0 C (95.0 F)
1957	36.7 C (98.1 F)
1958	35.6 C (96.1 F)
1959	37.2 C (99.0 F)
1960	37.8 C (100.0 F)
1961	38.9 C (102.0 F)
1962	32.2 C (90.0 F)
1963	37.8 C (100.0 F)
1964	35.0 C (95.0 F)
1965	23.9 C (75.0 F)

Coldest night (TNn)

The coldest night of the year at Hays, 1921 to 1965. The record is -48.9 C (-56.0 F) in 1929, marked on the chart; the median year is -33.6 C (-28.5 F).

Coldest night (TNn) at Hays by year
Year	Coldest night (TNn)
1921	-35.6 C (-32.1 F)
1922	-35.6 C (-32.1 F)
1923	-38.9 C (-38.0 F)
1924	-38.9 C (-38.0 F)
1925	-33.3 C (-27.9 F)
1926	-28.9 C (-20.0 F)
1927	-36.7 C (-34.1 F)
1928	-28.9 C (-20.0 F)
1929	-48.9 C (-56.0 F)
1930	-38.3 C (-36.9 F)
1946	-30.6 C (-23.1 F)
1947	-30.6 C (-23.1 F)
1948	-30.6 C (-23.1 F)
1949	-35.6 C (-32.1 F)
1950	-37.2 C (-35.0 F)
1951	-37.2 C (-35.0 F)
1952	-34.4 C (-29.9 F)
1953	-24.4 C (-11.9 F)
1954	-37.2 C (-35.0 F)
1955	-32.2 C (-26.0 F)
1956	-32.2 C (-26.0 F)
1957	-35.6 C (-32.1 F)
1958	-26.7 C (-16.1 F)
1959	-33.9 C (-29.0 F)
1960	-32.2 C (-26.0 F)
1961	-30.6 C (-23.1 F)
1962	-33.3 C (-27.9 F)
1963	-36.1 C (-33.0 F)
1964	-28.9 C (-20.0 F)
1965	-28.9 C (-20.0 F)

Wettest day (Rx1day)

The wettest day of the year at Hays, 1921 to 1965. The record is 81.3 mm (3.2 in) in 1923, marked on the chart; the median year is 27.9 mm (1.1 in).

Wettest day (Rx1day) at Hays by year
Year	Wettest day (Rx1day)
1921	5.1 mm (0.20 in)
1922	33.3 mm (1.3 in)
1923	81.3 mm (3.2 in)
1924	27.9 mm (1.1 in)
1925	58.4 mm (2.3 in)
1926	27.9 mm (1.1 in)
1927	45.7 mm (1.8 in)
1928	50.8 mm (2.0 in)
1929	33.0 mm (1.3 in)
1930	4.6 mm (0.18 in)
1946	n/a
1947	27.9 mm (1.1 in)
1948	32.3 mm (1.3 in)
1949	38.1 mm (1.5 in)
1950	20.3 mm (0.8 in)
1951	19.1 mm (0.8 in)
1952	20.1 mm (0.8 in)
1953	54.6 mm (2.1 in)
1954	21.8 mm (0.9 in)
1955	42.4 mm (1.7 in)
1956	25.4 mm (1.0 in)
1957	27.9 mm (1.1 in)
1958	24.4 mm (1.0 in)
1959	33.8 mm (1.3 in)
1960	13.7 mm (0.5 in)
1961	44.7 mm (1.8 in)
1962	30.5 mm (1.2 in)
1963	20.3 mm (0.8 in)
1964	49.5 mm (1.9 in)
1965	25.4 mm (1.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Hays, 1921 to 1965. The record is 175.2 mm (6.9 in) in 1928, marked on the chart; the median year is 42.4 mm (1.7 in).

Wettest five days (Rx5day) at Hays by year
Year	Wettest five days (Rx5day)
1921	6.7 mm (0.26 in)
1922	41.8 mm (1.6 in)
1923	138.7 mm (5.5 in)
1924	43.9 mm (1.7 in)
1925	89.0 mm (3.5 in)
1926	64.7 mm (2.5 in)
1927	74.1 mm (2.9 in)
1928	175.2 mm (6.9 in)
1929	38.0 mm (1.5 in)
1930	7.9 mm (0.31 in)
1946	n/a
1947	42.4 mm (1.7 in)
1948	45.7 mm (1.8 in)
1949	39.1 mm (1.5 in)
1950	35.3 mm (1.4 in)
1951	23.4 mm (0.9 in)
1952	28.0 mm (1.1 in)
1953	109.4 mm (4.3 in)
1954	43.1 mm (1.7 in)
1955	42.4 mm (1.7 in)
1956	32.0 mm (1.3 in)
1957	34.3 mm (1.4 in)
1958	24.1 mm (0.9 in)
1959	47.0 mm (1.9 in)
1960	24.6 mm (1.0 in)
1961	54.4 mm (2.1 in)
1962	48.4 mm (1.9 in)
1963	31.7 mm (1.2 in)
1964	75.5 mm (3.0 in)
1965	37.8 mm (1.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Hays, 1921 to 1965. The record is 59 days in 1928, marked on the chart; the median year is 32 days.

Longest dry spell (CDD) at Hays by year
Year	Longest dry spell (CDD)
1921	20 days
1922	28 days
1923	24 days
1924	26 days
1925	52 days
1926	32 days
1927	23 days
1928	59 days
1929	35 days
1930	15 days
1946	n/a
1947	43 days
1948	34 days
1949	44 days
1950	21 days
1951	19 days
1952	34 days
1953	31 days
1954	35 days
1955	42 days
1956	21 days
1957	33 days
1958	29 days
1959	37 days
1960	37 days
1961	36 days
1962	28 days
1963	31 days
1964	45 days
1965	24 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.

Download the Data

Data for Hays standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Hays 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 2026-10-16 (16 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).