San Luis 1 S Weather Records (USC00057428)

Record envelope, standing records and threshold days for San Luis 1 S (USC00057428), Colorado, United States, with 59 years of record.

Key Facts for San Luis 1 S

San Luis 1 S (USC00057428) is a weather station in Colorado, United States at 37.20 latitude and -105.42 longitude, 2,421 m (7,943 ft) above sea level.
The station reports from 1893 to 1951, 59 years of record.
1,464 records set at San Luis 1 S still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
San Luis 1 S set a daily record precipitation of 3.3 mm (0.13 in) on 27 March 1951.

About the Station

Location: Colorado, United States, 37.20 latitude, -105.42 longitude.
Elevation: 2,421 m (7,943 ft).
Period of record: 1893 to 1951, 59 years.
Eligible elements: tmax, tmin, 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 San Luis 1 S. 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 San Luis 1 S, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	14.4 C (57.9 F)	-36.7 C (-34.1 F)	n/a	n/a
Feb	18.3 C (64.9 F)	-36.7 C (-34.1 F)	n/a	n/a
Mar	23.3 C (73.9 F)	-32.8 C (-27.0 F)	n/a	n/a
Apr	26.7 C (80.1 F)	-25.6 C (-14.1 F)	n/a	n/a
May	32.2 C (90.0 F)	-11.1 C (12.0 F)	n/a	n/a
Jun	35.6 C (96.1 F)	-8.3 C (17.1 F)	n/a	n/a
Jul	35.0 C (95.0 F)	-1.1 C (30.0 F)	n/a	n/a
Aug	36.7 C (98.1 F)	0.0 C (32.0 F)	n/a	n/a
Sep	36.1 C (97.0 F)	-8.3 C (17.1 F)	n/a	n/a
Oct	30.6 C (87.1 F)	-22.8 C (-9.0 F)	n/a	n/a
Nov	22.2 C (72.0 F)	-26.7 C (-16.1 F)	n/a	n/a
Dec	16.1 C (61.0 F)	-35.6 C (-32.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at San Luis 1 S still stand. 1896 holds the most, with 82.

Standing records at San Luis 1 S by the year they were set
Year set	Standing records
1893	59
1894	64
1895	78
1896	82
1897	62
1898	80
1899	51
1900	69
1901	46
1902	45
1903	38
1904	49
1905	39
1906	49
1907	59
1908	39
1909	50
1910	42
1911	47
1912	41
1913	53
1914	21
1915	30
1916	41
1917	35
1918	48
1919	40
1920	30
1921	23
1922	34
1923	20

Wettest Day of Each Month

Oct: 76.2 mm (3.0 in)

The wettest day on record for each calendar month at San Luis 1 S. The most was 76.2 mm (3.0 in) on 13 October 1920.

Record daily precipitation for each month at San Luis 1 S
Month	Record daily precipitation (mm)	Date
Jan	16.8 mm (0.7 in)	19 January 1916
Feb	13.5 mm (0.5 in)	25 February 1895
Mar	38.1 mm (1.5 in)	18 March 1922
Apr	40.9 mm (1.6 in)	13 April 1896
May	26.9 mm (1.1 in)	5 May 1917
Jun	26.7 mm (1.1 in)	11 June 1913
Jul	42.7 mm (1.7 in)	12 July 1898
Aug	23.9 mm (0.9 in)	5 August 1910
Sep	25.7 mm (1.0 in)	10 September 1894
Oct	76.2 mm (3.0 in)	13 October 1920
Nov	20.3 mm (0.8 in)	1 November 1899
Dec	21.6 mm (0.9 in)	15 December 1915

Period of Record Coverage

1893 to 1923

31 years of record at San Luis 1 S, 1893 to 1923. 6 years have data for under 90 percent of days and are left out of rankings: 1904, 1905, 1919, 1920, 1921, 1923.

Days with data per year at San Luis 1 S
Year	Days with data	Share of year	Complete
1893	334	92%	Yes
1894	361	99%	Yes
1895	364	100%	Yes
1896	361	99%	Yes
1897	365	100%	Yes
1898	346	95%	Yes
1899	365	100%	Yes
1900	362	99%	Yes
1901	365	100%	Yes
1902	358	98%	Yes
1903	331	91%	Yes
1904	295	81%	No
1905	326	89%	No
1906	354	97%	Yes
1907	364	100%	Yes
1908	365	100%	Yes
1909	355	97%	Yes
1910	359	98%	Yes
1911	335	92%	Yes
1912	364	99%	Yes
1913	365	100%	Yes
1914	363	99%	Yes
1915	365	100%	Yes
1916	364	99%	Yes
1917	365	100%	Yes
1918	356	98%	Yes
1919	310	85%	No
1920	305	83%	No
1921	160	44%	No
1922	361	99%	Yes
1923	303	83%	No

Latest Records

Latest records at San Luis 1 S
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
27 March 1951	San Luis 1 S, US	daily rain	3.3 mm (0.13 in)	1.5 mm (0.06 in)	51 years	20 of 100 (Routine)
25 September 1950	San Luis 1 S, US	daily rain	6.4 mm (0.25 in)	1.3 mm (0.05 in)	44 years	20 of 100 (Routine)
19 September 1950	San Luis 1 S, US	daily rain	10.9 mm (0.4 in)	0.2 mm (0.01 in)	39 years	16 of 100 (Routine)
4 June 1950	San Luis 1 S, US	daily rain	20.3 mm (0.8 in)	16.5 mm (0.6 in)	35 years	20 of 100 (Routine)
24 January 1950	San Luis 1 S, US	daily rain	3.6 mm (0.14 in)	1.3 mm (0.05 in)	0 years	8 of 100 (Routine)
10 December 1949	San Luis 1 S, US	daily rain	11.2 mm (0.4 in)	9.7 mm (0.38 in)	38 years	20 of 100 (Routine)
1 September 1949	San Luis 1 S, US	daily rain	3.8 mm (0.15 in)	2.3 mm (0.09 in)	51 years	20 of 100 (Routine)
19 June 1949	San Luis 1 S, US	daily rain	4.3 mm (0.17 in)	2.0 mm (0.08 in)	36 years	19 of 100 (Routine)
27 May 1949	San Luis 1 S, US	daily rain	15.5 mm (0.6 in)	1.5 mm (0.06 in)	47 years	20 of 100 (Routine)
12 May 1949	San Luis 1 S, US	daily rain	9.4 mm (0.37 in)	4.8 mm (0.19 in)	43 years	20 of 100 (Routine)
11 May 1949	San Luis 1 S, US	daily rain	2.5 mm (0.10 in)	0.5 mm (0.02 in)	51 years	20 of 100 (Routine)
9 April 1949	San Luis 1 S, US	daily rain	6.9 mm (0.27 in)	4.4 mm (0.17 in)	34 years	20 of 100 (Routine)
2 April 1949	San Luis 1 S, US	daily rain	6.1 mm (0.24 in)	1.0 mm (0.04 in)	44 years	19 of 100 (Routine)
20 March 1949	San Luis 1 S, US	daily rain	10.2 mm (0.4 in)	0.8 mm (0.03 in)	47 years	20 of 100 (Routine)
7 March 1949	San Luis 1 S, US	daily rain	2.5 mm (0.10 in)	1.0 mm (0.04 in)	30 years	16 of 100 (Routine)
13 February 1949	San Luis 1 S, US	daily rain	5.6 mm (0.22 in)	2.6 mm (0.10 in)	54 years	20 of 100 (Routine)
24 January 1949	San Luis 1 S, US	daily rain	2.3 mm (0.09 in)	1.0 mm (0.04 in)	50 years	20 of 100 (Routine)
3 January 1949	San Luis 1 S, US	daily rain	2.0 mm (0.08 in)	0.7 mm (0.03 in)	35 years	16 of 100 (Routine)
23 December 1948	San Luis 1 S, US	daily rain	5.6 mm (0.22 in)	2.6 mm (0.10 in)	27 years	18 of 100 (Routine)
7 December 1948	San Luis 1 S, US	daily rain	0.5 mm (0.02 in)	0.5 mm (0.02 in)	54 years	20 of 100 (Routine)

Climate Trend

20 complete years, 1894 to 1922

One stripe for each of 20 complete years at San Luis 1 S, 1894 to 1922. Blue stripes are years cooler than the station's own mean of 5.7 C (42.2 F); red stripes are warmer. The coolest year was 1898, at 4.0 C (39.3 F), and the warmest was 1910, at 7.2 C (45.0 F). The strongest colour marks a difference of 1.7 C (3.1 F).

Annual mean temperature at San Luis 1 S as warming stripes, 1894 to 1922
Year	Annual mean temperature	Difference from the station mean
1894	6.4 C	+0.71 C
1895	5.9 C	+0.19 C
1897	5.4 C	-0.26 C
1898	4.0 C	-1.65 C
1899	5.6 C	-0.06 C
1901	7.0 C	+1.34 C
1902	6.0 C	+0.31 C
1906	6.4 C	+0.71 C
1907	6.7 C	+0.99 C
1908	5.4 C	-0.27 C
1909	6.0 C	+0.32 C
1910	7.2 C	+1.53 C
1912	5.3 C	-0.35 C
1913	4.5 C	-1.16 C
1914	5.3 C	-0.38 C
1915	5.0 C	-0.68 C
1916	5.7 C	+0.05 C
1917	4.9 C	-0.81 C
1918	4.9 C	-0.74 C
1922	5.9 C	+0.18 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

1893 to 1951

Yearly extremes at San Luis 1 S: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	36.7 C (98.1 F)	1896	30.6 C (87.1 F)	31
Coldest night (TNn)	-36.7 C (-34.1 F)	1895	-30.0 C (-22.0 F)	31
Wettest day (Rx1day)	76.2 mm (3.0 in)	1920	25.7 mm (1.0 in)	35
Wettest five days (Rx5day)	76.2 mm (3.0 in)	1920	38.6 mm (1.5 in)	35
Longest dry spell (CDD)	110 days	1903	35 days	35

Hottest day (TXx)

The hottest day of the year at San Luis 1 S, 1893 to 1951. The record is 36.7 C (98.1 F) in 1896, marked on the chart; the median year is 30.6 C (87.1 F).

Hottest day (TXx) at San Luis 1 S by year
Year	Hottest day (TXx)
1893	31.1 C (88.0 F)
1894	32.8 C (91.0 F)
1895	36.1 C (97.0 F)
1896	36.7 C (98.1 F)
1897	33.9 C (93.0 F)
1898	31.1 C (88.0 F)
1899	31.7 C (89.1 F)
1900	32.8 C (91.0 F)
1901	33.3 C (91.9 F)
1902	32.8 C (91.0 F)
1903	32.8 C (91.0 F)
1904	30.6 C (87.1 F)
1905	29.4 C (84.9 F)
1906	28.9 C (84.0 F)
1907	29.4 C (84.9 F)
1908	28.9 C (84.0 F)
1909	30.6 C (87.1 F)
1910	31.7 C (89.1 F)
1911	30.0 C (86.0 F)
1912	31.1 C (88.0 F)
1913	29.4 C (84.9 F)
1914	29.4 C (84.9 F)
1915	28.3 C (82.9 F)
1916	28.9 C (84.0 F)
1917	30.0 C (86.0 F)
1918	30.0 C (86.0 F)
1919	29.4 C (84.9 F)
1920	28.3 C (82.9 F)
1921	27.2 C (81.0 F)
1922	30.6 C (87.1 F)
1923	28.9 C (84.0 F)
1948	n/a
1949	n/a
1950	n/a
1951	n/a

Coldest night (TNn)

The coldest night of the year at San Luis 1 S, 1893 to 1951. The record is -36.7 C (-34.1 F) in 1895, marked on the chart; the median year is -30.0 C (-22.0 F).

Coldest night (TNn) at San Luis 1 S by year
Year	Coldest night (TNn)
1893	-21.7 C (-7.1 F)
1894	-33.9 C (-29.0 F)
1895	-36.7 C (-34.1 F)
1896	-28.3 C (-18.9 F)
1897	-31.7 C (-25.1 F)
1898	-34.4 C (-29.9 F)
1899	-31.7 C (-25.1 F)
1900	-27.2 C (-17.0 F)
1901	-28.3 C (-18.9 F)
1902	-33.3 C (-27.9 F)
1903	-32.8 C (-27.0 F)
1904	-26.1 C (-15.0 F)
1905	-32.2 C (-26.0 F)
1906	-27.8 C (-18.0 F)
1907	-26.1 C (-15.0 F)
1908	-26.1 C (-15.0 F)
1909	-33.3 C (-27.9 F)
1910	-27.8 C (-18.0 F)
1911	-32.2 C (-26.0 F)
1912	-28.9 C (-20.0 F)
1913	-35.0 C (-31.0 F)
1914	-27.8 C (-18.0 F)
1915	-33.9 C (-29.0 F)
1916	-30.0 C (-22.0 F)
1917	-26.7 C (-16.1 F)
1918	-35.6 C (-32.1 F)
1919	-36.7 C (-34.1 F)
1920	-30.6 C (-23.1 F)
1921	-23.3 C (-9.9 F)
1922	-25.6 C (-14.1 F)
1923	-27.2 C (-17.0 F)
1948	n/a
1949	n/a
1950	n/a
1951	n/a

Wettest day (Rx1day)

The wettest day of the year at San Luis 1 S, 1893 to 1951. The record is 76.2 mm (3.0 in) in 1920, marked on the chart; the median year is 25.7 mm (1.0 in).

Wettest day (Rx1day) at San Luis 1 S by year
Year	Wettest day (Rx1day)
1893	21.6 mm (0.9 in)
1894	25.7 mm (1.0 in)
1895	26.7 mm (1.1 in)
1896	40.9 mm (1.6 in)
1897	16.5 mm (0.6 in)
1898	42.7 mm (1.7 in)
1899	27.4 mm (1.1 in)
1900	19.3 mm (0.8 in)
1901	27.4 mm (1.1 in)
1902	17.8 mm (0.7 in)
1903	18.5 mm (0.7 in)
1904	25.4 mm (1.0 in)
1905	41.9 mm (1.6 in)
1906	35.6 mm (1.4 in)
1907	20.1 mm (0.8 in)
1908	33.0 mm (1.3 in)
1909	17.3 mm (0.7 in)
1910	23.9 mm (0.9 in)
1911	38.1 mm (1.5 in)
1912	22.1 mm (0.9 in)
1913	37.3 mm (1.5 in)
1914	29.2 mm (1.1 in)
1915	26.7 mm (1.1 in)
1916	17.0 mm (0.7 in)
1917	26.9 mm (1.1 in)
1918	20.6 mm (0.8 in)
1919	34.3 mm (1.4 in)
1920	76.2 mm (3.0 in)
1921	38.1 mm (1.5 in)
1922	38.1 mm (1.5 in)
1923	17.0 mm (0.7 in)
1948	8.6 mm (0.34 in)
1949	15.5 mm (0.6 in)
1950	20.3 mm (0.8 in)
1951	16.0 mm (0.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at San Luis 1 S, 1893 to 1951. The record is 76.2 mm (3.0 in) in 1920, marked on the chart; the median year is 38.6 mm (1.5 in).

Wettest five days (Rx5day) at San Luis 1 S by year
Year	Wettest five days (Rx5day)
1893	30.7 mm (1.2 in)
1894	33.8 mm (1.3 in)
1895	37.4 mm (1.5 in)
1896	43.2 mm (1.7 in)
1897	24.6 mm (1.0 in)
1898	51.3 mm (2.0 in)
1899	47.6 mm (1.9 in)
1900	39.1 mm (1.5 in)
1901	52.2 mm (2.1 in)
1902	34.8 mm (1.4 in)
1903	20.9 mm (0.8 in)
1904	35.6 mm (1.4 in)
1905	41.9 mm (1.6 in)
1906	38.6 mm (1.5 in)
1907	26.4 mm (1.0 in)
1908	69.6 mm (2.7 in)
1909	40.2 mm (1.6 in)
1910	32.0 mm (1.3 in)
1911	50.1 mm (2.0 in)
1912	23.4 mm (0.9 in)
1913	46.3 mm (1.8 in)
1914	48.5 mm (1.9 in)
1915	37.6 mm (1.5 in)
1916	51.8 mm (2.0 in)
1917	28.9 mm (1.1 in)
1918	18.8 mm (0.7 in)
1919	50.6 mm (2.0 in)
1920	76.2 mm (3.0 in)
1921	55.6 mm (2.2 in)
1922	40.9 mm (1.6 in)
1923	39.4 mm (1.6 in)
1948	15.2 mm (0.6 in)
1949	17.3 mm (0.7 in)
1950	20.3 mm (0.8 in)
1951	24.7 mm (1.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at San Luis 1 S, 1893 to 1951. The record is 110 days in 1903, marked on the chart; the median year is 35 days.

Longest dry spell (CDD) at San Luis 1 S by year
Year	Longest dry spell (CDD)
1893	23 days
1894	47 days
1895	45 days
1896	38 days
1897	39 days
1898	26 days
1899	30 days
1900	37 days
1901	31 days
1902	39 days
1903	110 days
1904	54 days
1905	54 days
1906	43 days
1907	93 days
1908	35 days
1909	24 days
1910	34 days
1911	23 days
1912	42 days
1913	30 days
1914	58 days
1915	29 days
1916	32 days
1917	75 days
1918	35 days
1919	30 days
1920	69 days
1921	19 days
1922	28 days
1923	25 days
1948	27 days
1949	28 days
1950	59 days
1951	15 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

20 years with a frost

Across 20 years with a frost, the median last spring frost at San Luis 1 S falls on 15 June and the median first autumn frost on 14 September, which leaves a median of 91 days between them.

Frost dates and growing season at San Luis 1 S
Measure	Median, all years	Earliest period	Recent period (1894 to 1922)	Recent against earliest	Fitted trend
Last spring frost	15 June	n/a	15 June	n/a	n/a
First autumn frost	14 September	n/a	14 September	n/a	n/a
Growing days	91 days	n/a	91 days	n/a	n/a

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 San Luis 1 S standing records by year: CSV or JSON. Field meanings are on the data page.
Data for San Luis 1 S 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 2026-10-17 (17 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).