Alamosa Weather Records (USC00050125)

Record envelope, standing records and threshold days for Alamosa (USC00050125), Colorado, United States, with 44 years of record.

Key Facts for Alamosa

Alamosa (USC00050125) is a weather station in Colorado, United States at 37.47 latitude and -105.88 longitude, 2,297 m (7,536 ft) above sea level.
The station reports from 1906 to 1949, 44 years of record.
1,464 records set at Alamosa still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Colorado, United States, 37.47 latitude, -105.88 longitude.
Elevation: 2,297 m (7,536 ft).
Period of record: 1906 to 1949, 44 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 Alamosa. 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 Alamosa, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	13.9 C (57.0 F)	-43.3 C (-45.9 F)	n/a	n/a
Feb	17.8 C (64.0 F)	-37.2 C (-35.0 F)	n/a	n/a
Mar	22.2 C (72.0 F)	-27.8 C (-18.0 F)	n/a	n/a
Apr	25.6 C (78.1 F)	-20.0 C (-4.0 F)	n/a	n/a
May	27.8 C (82.0 F)	-10.6 C (12.9 F)	n/a	n/a
Jun	31.7 C (89.1 F)	-5.0 C (23.0 F)	n/a	n/a
Jul	32.8 C (91.0 F)	0.6 C (33.1 F)	n/a	n/a
Aug	31.7 C (89.1 F)	-1.1 C (30.0 F)	n/a	n/a
Sep	30.6 C (87.1 F)	-7.2 C (19.0 F)	n/a	n/a
Oct	26.1 C (79.0 F)	-22.2 C (-8.0 F)	n/a	n/a
Nov	19.4 C (66.9 F)	-26.1 C (-15.0 F)	n/a	n/a
Dec	15.6 C (60.1 F)	-33.9 C (-29.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Alamosa still stand. 1948 holds the most, with 97.

Standing records at Alamosa by the year they were set
Year set	Standing records
1906	30
1907	81
1932	61
1933	85
1934	92
1935	75
1936	72
1937	66
1938	81
1939	77
1940	76
1941	72
1942	52
1943	94
1944	75
1945	74
1946	96
1947	49
1948	97
1949	59

Wettest Day of Each Month

Jul: 39.4 mm (1.6 in)

The wettest day on record for each calendar month at Alamosa. The most was 39.4 mm (1.6 in) on 28 July 1939.

Record daily precipitation for each month at Alamosa
Month	Record daily precipitation (mm)	Date
Jan	15.2 mm (0.6 in)	26 January 1948
Feb	6.1 mm (0.24 in)	25 February 1948
Mar	9.7 mm (0.38 in)	25 March 1941
Apr	36.8 mm (1.4 in)	15 April 1938
May	29.5 mm (1.2 in)	18 May 1935
Jun	18.0 mm (0.7 in)	10 June 1936
Jul	39.4 mm (1.6 in)	28 July 1939
Aug	35.1 mm (1.4 in)	5 August 1936
Sep	31.5 mm (1.2 in)	3 September 1938
Oct	30.5 mm (1.2 in)	8 October 1938
Nov	19.1 mm (0.8 in)	20 November 1948
Dec	26.2 mm (1.0 in)	9 December 1943

Period of Record Coverage

1906 to 1949

20 years of record at Alamosa, 1906 to 1949. 3 years have data for under 90 percent of days and are left out of rankings: 1906, 1907, 1932.

Days with data per year at Alamosa
Year	Days with data	Share of year	Complete
1906	117	32%	No
1907	221	61%	No
1932	275	75%	No
1933	365	100%	Yes
1934	365	100%	Yes
1935	364	100%	Yes
1936	366	100%	Yes
1937	365	100%	Yes
1938	365	100%	Yes
1939	356	98%	Yes
1940	364	99%	Yes
1941	365	100%	Yes
1942	362	99%	Yes
1943	365	100%	Yes
1944	366	100%	Yes
1945	365	100%	Yes
1946	365	100%	Yes
1947	365	100%	Yes
1948	363	99%	Yes
1949	361	99%	Yes

Latest Records

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

Climate Trend

17 complete years, 1933 to 1949

One stripe for each of 17 complete years at Alamosa, 1933 to 1949. Blue stripes are years cooler than the station's own mean of 5.3 C (41.5 F); red stripes are warmer. The coolest year was 1944, at 4.2 C (39.5 F), and the warmest was 1934, at 6.9 C (44.4 F). The strongest colour marks a difference of 1.7 C (3.1 F).

Annual mean temperature at Alamosa as warming stripes, 1933 to 1949
Year	Annual mean temperature	Difference from the station mean
1933	5.0 C	-0.31 C
1934	6.9 C	+1.63 C
1935	5.8 C	+0.52 C
1936	5.8 C	+0.55 C
1937	5.6 C	+0.37 C
1938	5.6 C	+0.30 C
1939	4.9 C	-0.39 C
1940	5.0 C	-0.26 C
1941	4.5 C	-0.77 C
1942	5.4 C	+0.09 C
1943	5.1 C	-0.17 C
1944	4.2 C	-1.11 C
1945	5.1 C	-0.16 C
1946	6.2 C	+0.97 C
1947	5.5 C	+0.18 C
1948	4.5 C	-0.75 C
1949	4.5 C	-0.76 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

1906 to 1949

Yearly extremes at Alamosa: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	32.8 C (91.0 F)	1934	31.7 C (89.1 F)	20
Coldest night (TNn)	-43.3 C (-45.9 F)	1948	-31.4 C (-24.5 F)	20
Wettest day (Rx1day)	39.4 mm (1.6 in)	1939	18.2 mm (0.7 in)	20
Wettest five days (Rx5day)	55.7 mm (2.2 in)	1936	29.5 mm (1.2 in)	20
Longest dry spell (CDD)	75 days	1939	45 days	20

Hottest day (TXx)

The hottest day of the year at Alamosa, 1906 to 1949. The record is 32.8 C (91.0 F) in 1934, marked on the chart; the median year is 31.7 C (89.1 F).

Hottest day (TXx) at Alamosa by year
Year	Hottest day (TXx)
1906	30.6 C (87.1 F)
1907	31.1 C (88.0 F)
1932	29.4 C (84.9 F)
1933	30.6 C (87.1 F)
1934	32.8 C (91.0 F)
1935	30.6 C (87.1 F)
1936	31.7 C (89.1 F)
1937	31.7 C (89.1 F)
1938	31.7 C (89.1 F)
1939	31.7 C (89.1 F)
1940	32.2 C (90.0 F)
1941	28.9 C (84.0 F)
1942	30.6 C (87.1 F)
1943	31.7 C (89.1 F)
1944	31.7 C (89.1 F)
1945	31.7 C (89.1 F)
1946	31.7 C (89.1 F)
1947	31.1 C (88.0 F)
1948	31.7 C (89.1 F)
1949	30.0 C (86.0 F)

Coldest night (TNn)

The coldest night of the year at Alamosa, 1906 to 1949. The record is -43.3 C (-45.9 F) in 1948, marked on the chart; the median year is -31.4 C (-24.5 F).

Coldest night (TNn) at Alamosa by year
Year	Coldest night (TNn)
1906	-5.6 C (21.9 F)
1907	-17.8 C (0.0 F)
1932	-33.9 C (-29.0 F)
1933	-35.6 C (-32.1 F)
1934	-26.7 C (-16.1 F)
1935	-27.8 C (-18.0 F)
1936	-26.1 C (-15.0 F)
1937	-30.0 C (-22.0 F)
1938	-31.1 C (-24.0 F)
1939	-31.7 C (-25.1 F)
1940	-33.9 C (-29.0 F)
1941	-32.8 C (-27.0 F)
1942	-34.4 C (-29.9 F)
1943	-31.7 C (-25.1 F)
1944	-37.8 C (-36.0 F)
1945	-29.4 C (-20.9 F)
1946	-26.1 C (-15.0 F)
1947	-27.2 C (-17.0 F)
1948	-43.3 C (-45.9 F)
1949	-33.9 C (-29.0 F)

Wettest day (Rx1day)

The wettest day of the year at Alamosa, 1906 to 1949. The record is 39.4 mm (1.6 in) in 1939, marked on the chart; the median year is 18.2 mm (0.7 in).

Wettest day (Rx1day) at Alamosa by year
Year	Wettest day (Rx1day)
1906	8.4 mm (0.33 in)
1907	11.4 mm (0.4 in)
1932	10.4 mm (0.4 in)
1933	16.5 mm (0.6 in)
1934	13.5 mm (0.5 in)
1935	29.5 mm (1.2 in)
1936	35.1 mm (1.4 in)
1937	16.3 mm (0.6 in)
1938	36.8 mm (1.4 in)
1939	39.4 mm (1.6 in)
1940	16.0 mm (0.6 in)
1941	21.8 mm (0.9 in)
1942	23.9 mm (0.9 in)
1943	26.2 mm (1.0 in)
1944	24.4 mm (1.0 in)
1945	8.4 mm (0.33 in)
1946	12.7 mm (0.5 in)
1947	17.3 mm (0.7 in)
1948	19.1 mm (0.8 in)
1949	21.8 mm (0.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Alamosa, 1906 to 1949. The record is 55.7 mm (2.2 in) in 1936, marked on the chart; the median year is 29.5 mm (1.2 in).

Wettest five days (Rx5day) at Alamosa by year
Year	Wettest five days (Rx5day)
1906	18.3 mm (0.7 in)
1907	19.0 mm (0.7 in)
1932	18.0 mm (0.7 in)
1933	31.9 mm (1.3 in)
1934	16.5 mm (0.6 in)
1935	46.1 mm (1.8 in)
1936	55.7 mm (2.2 in)
1937	16.8 mm (0.7 in)
1938	38.9 mm (1.5 in)
1939	51.3 mm (2.0 in)
1940	30.0 mm (1.2 in)
1941	40.3 mm (1.6 in)
1942	34.1 mm (1.3 in)
1943	26.2 mm (1.0 in)
1944	40.2 mm (1.6 in)
1945	12.6 mm (0.5 in)
1946	20.8 mm (0.8 in)
1947	28.9 mm (1.1 in)
1948	19.1 mm (0.8 in)
1949	34.3 mm (1.4 in)

Longest dry spell (CDD)

The longest dry spell of the year at Alamosa, 1906 to 1949. The record is 75 days in 1939, marked on the chart; the median year is 45 days.

Longest dry spell (CDD) at Alamosa by year
Year	Longest dry spell (CDD)
1906	11 days
1907	62 days
1932	45 days
1933	71 days
1934	68 days
1935	69 days
1936	62 days
1937	36 days
1938	43 days
1939	75 days
1940	35 days
1941	33 days
1942	52 days
1943	45 days
1944	40 days
1945	45 days
1946	63 days
1947	29 days
1948	35 days
1949	68 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 Alamosa standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Alamosa 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).