Saco Nelson Rsvr Weather Records (USC00247267)

Record envelope, standing records and threshold days for Saco Nelson Rsvr (USC00247267), Montana, United States, with 45 years of record.

Key Facts for Saco Nelson Rsvr

Saco Nelson Rsvr (USC00247267) is a weather station in Montana, United States at 48.50 latitude and -107.52 longitude, 680 m (2,231 ft) above sea level.
The station reports from 1921 to 1965, 45 years of record.
1,464 records set at Saco Nelson Rsvr 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, 48.50 latitude, -107.52 longitude.
Elevation: 680 m (2,231 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 Saco Nelson Rsvr. 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 Saco Nelson Rsvr, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	12.2 C (54.0 F)	-38.9 C (-38.0 F)	n/a	n/a
Feb	14.4 C (57.9 F)	-41.1 C (-42.0 F)	n/a	n/a
Mar	23.9 C (75.0 F)	-37.2 C (-35.0 F)	n/a	n/a
Apr	34.4 C (93.9 F)	-15.6 C (3.9 F)	n/a	n/a
May	34.4 C (93.9 F)	-6.1 C (21.0 F)	n/a	n/a
Jun	36.7 C (98.1 F)	1.1 C (34.0 F)	n/a	n/a
Jul	41.1 C (106.0 F)	3.9 C (39.0 F)	n/a	n/a
Aug	40.6 C (105.1 F)	-1.1 C (30.0 F)	n/a	n/a
Sep	37.8 C (100.0 F)	-8.3 C (17.1 F)	n/a	n/a
Oct	31.7 C (89.1 F)	-12.8 C (9.0 F)	n/a	n/a
Nov	20.0 C (68.0 F)	-30.6 C (-23.1 F)	n/a	n/a
Dec	14.4 C (57.9 F)	-42.8 C (-45.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Saco Nelson Rsvr still stand. 1963 holds the most, with 211.

Wettest Day of Each Month

Jun: 69.9 mm (2.8 in)

The wettest day on record for each calendar month at Saco Nelson Rsvr. The most was 69.9 mm (2.8 in) on 29 June 1965.

Record daily precipitation for each month at Saco Nelson Rsvr
Month	Record daily precipitation (mm)	Date
Jan	7.6 mm (0.30 in)	6 January 1923
Feb	5.3 mm (0.21 in)	12 February 1962
Mar	21.3 mm (0.8 in)	11 March 1954
Apr	29.2 mm (1.1 in)	23 April 1925
May	49.5 mm (1.9 in)	29 May 1953
Jun	69.9 mm (2.8 in)	29 June 1965
Jul	53.3 mm (2.1 in)	14 July 1962
Aug	34.0 mm (1.3 in)	6 August 1924
Sep	20.3 mm (0.8 in)	10 September 1921
Oct	39.6 mm (1.6 in)	12 October 1924
Nov	6.4 mm (0.25 in)	21 November 1955
Dec	20.1 mm (0.8 in)	10 December 1953

Period of Record Coverage

1921 to 1965

12 years of record at Saco Nelson Rsvr, 1921 to 1965. 9 years have data for under 90 percent of days and are left out of rankings: 1921, 1922, 1923, 1924, 1925, 1959, 1960, 1961 and others.

Days with data per year at Saco Nelson Rsvr
Year	Days with data	Share of year	Complete
1921	70	19%	No
1922	163	45%	No
1923	61	17%	No
1924	65	18%	No
1925	23	6%	No
1959	223	61%	No
1960	320	87%	No
1961	319	87%	No
1962	336	92%	Yes
1963	336	92%	Yes
1964	344	94%	Yes
1965	211	58%	No

Latest Records

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

Extremes by Year

1921 to 1965

Yearly extremes at Saco Nelson Rsvr: 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)	1959	37.0 C (98.5 F)	12
Coldest night (TNn)	-42.8 C (-45.0 F)	1922	-35.5 C (-32.0 F)	12
Wettest day (Rx1day)	69.9 mm (2.8 in)	1965	34.7 mm (1.4 in)	18
Wettest five days (Rx5day)	100.1 mm (3.9 in)	1962	46.3 mm (1.8 in)	18
Longest dry spell (CDD)	83 days	1959	47 days	18

Hottest day (TXx)

The hottest day of the year at Saco Nelson Rsvr, 1921 to 1965. The record is 41.1 C (106.0 F) in 1959, marked on the chart; the median year is 37.0 C (98.5 F).

Hottest day (TXx) at Saco Nelson Rsvr by year
Year	Hottest day (TXx)
1921	37.2 C (99.0 F)
1922	36.7 C (98.1 F)
1923	32.8 C (91.0 F)
1924	36.1 C (97.0 F)
1925	32.8 C (91.0 F)
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	41.1 C (106.0 F)
1960	37.8 C (100.0 F)
1961	40.6 C (105.1 F)
1962	34.4 C (93.9 F)
1963	39.4 C (102.9 F)
1964	38.3 C (100.9 F)
1965	36.7 C (98.1 F)

Coldest night (TNn)

The coldest night of the year at Saco Nelson Rsvr, 1921 to 1965. The record is -42.8 C (-45.0 F) in 1922, marked on the chart; the median year is -35.5 C (-32.0 F).

Coldest night (TNn) at Saco Nelson Rsvr by year
Year	Coldest night (TNn)
1921	-5.6 C (21.9 F)
1922	-42.8 C (-45.0 F)
1923	-37.2 C (-35.0 F)
1924	-9.4 C (15.1 F)
1925	-3.9 C (25.0 F)
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	-26.7 C (-16.1 F)
1960	-37.2 C (-35.0 F)
1961	-34.4 C (-29.9 F)
1962	-41.1 C (-42.0 F)
1963	-38.9 C (-38.0 F)
1964	-36.7 C (-34.1 F)
1965	-34.4 C (-29.9 F)

Wettest day (Rx1day)

The wettest day of the year at Saco Nelson Rsvr, 1921 to 1965. The record is 69.9 mm (2.8 in) in 1965, marked on the chart; the median year is 34.7 mm (1.4 in).

Wettest day (Rx1day) at Saco Nelson Rsvr by year
Year	Wettest day (Rx1day)
1921	20.3 mm (0.8 in)
1922	20.3 mm (0.8 in)
1923	42.7 mm (1.7 in)
1924	46.7 mm (1.8 in)
1925	30.2 mm (1.2 in)
1953	49.5 mm (1.9 in)
1954	43.7 mm (1.7 in)
1955	34.3 mm (1.4 in)
1956	31.2 mm (1.2 in)
1957	21.8 mm (0.9 in)
1958	13.7 mm (0.5 in)
1959	17.0 mm (0.7 in)
1960	11.7 mm (0.5 in)
1961	35.1 mm (1.4 in)
1962	53.3 mm (2.1 in)
1963	43.2 mm (1.7 in)
1964	44.2 mm (1.7 in)
1965	69.9 mm (2.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Saco Nelson Rsvr, 1921 to 1965. The record is 100.1 mm (3.9 in) in 1962, marked on the chart; the median year is 46.3 mm (1.8 in).

Wettest five days (Rx5day) at Saco Nelson Rsvr by year
Year	Wettest five days (Rx5day)
1921	44.9 mm (1.8 in)
1922	44.9 mm (1.8 in)
1923	64.0 mm (2.5 in)
1924	47.7 mm (1.9 in)
1925	47.5 mm (1.9 in)
1953	59.7 mm (2.4 in)
1954	49.3 mm (1.9 in)
1955	37.1 mm (1.5 in)
1956	36.0 mm (1.4 in)
1957	23.3 mm (0.9 in)
1958	28.4 mm (1.1 in)
1959	35.3 mm (1.4 in)
1960	20.3 mm (0.8 in)
1961	61.3 mm (2.4 in)
1962	100.1 mm (3.9 in)
1963	45.0 mm (1.8 in)
1964	75.1 mm (3.0 in)
1965	90.4 mm (3.6 in)

Longest dry spell (CDD)

The longest dry spell of the year at Saco Nelson Rsvr, 1921 to 1965. The record is 83 days in 1959, marked on the chart; the median year is 47 days.

Longest dry spell (CDD) at Saco Nelson Rsvr by year
Year	Longest dry spell (CDD)
1921	23 days
1922	77 days
1923	28 days
1924	19 days
1925	22 days
1953	47 days
1954	68 days
1955	59 days
1956	47 days
1957	48 days
1958	46 days
1959	83 days
1960	48 days
1961	39 days
1962	49 days
1963	40 days
1964	52 days
1965	46 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 Saco Nelson Rsvr standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Saco Nelson Rsvr 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).