Record envelope, standing records and threshold days for Black Rock (USC00291018), New Mexico, United States, with 42 years of record.
Key Facts for Black Rock
Black Rock (USC00291018) is a weather station in New Mexico, United States at 35.10 latitude and -108.78 longitude, 1,967 m (6,453 ft) above sea level.
The station reports from 1908 to 1949, 42 years of record.
1,464 records set at Black Rock still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Black Rock set a daily record precipitation of 14.2 mm (0.6 in) on 24 June 1949.
About the Station
Location: New Mexico, United States, 35.10 latitude, -108.78 longitude.
Elevation: 1,967 m (6,453 ft).
Period of record: 1908 to 1949, 42 years.
Eligible elements: tmax, tmin, prcp, snow.
Daily Record Envelope and 2026
0 days at or beyond a record
Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Black Rock. 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 Black Rock, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
21.1 C (70.0 F)
-35.0 C (-31.0 F)
n/a
n/a
Feb
21.7 C (71.1 F)
-28.9 C (-20.0 F)
n/a
n/a
Mar
25.0 C (77.0 F)
-21.7 C (-7.1 F)
n/a
n/a
Apr
30.0 C (86.0 F)
-15.0 C (5.0 F)
n/a
n/a
May
32.8 C (91.0 F)
-6.7 C (19.9 F)
n/a
n/a
Jun
39.4 C (102.9 F)
-5.6 C (21.9 F)
n/a
n/a
Jul
37.8 C (100.0 F)
2.8 C (37.0 F)
n/a
n/a
Aug
36.7 C (98.1 F)
2.8 C (37.0 F)
n/a
n/a
Sep
35.0 C (95.0 F)
-5.6 C (21.9 F)
n/a
n/a
Oct
30.6 C (87.1 F)
-11.7 C (10.9 F)
n/a
n/a
Nov
25.6 C (78.1 F)
-24.4 C (-11.9 F)
n/a
n/a
Dec
21.1 C (70.0 F)
-29.4 C (-20.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Black Rock still stand. 1912 holds the most, with 95.
Standing records at Black Rock by the year they were set
Year set
Standing records
1908
11
1909
36
1910
60
1911
37
1912
95
1913
33
1914
22
1915
31
1916
34
1917
40
1918
51
1919
75
1920
55
1921
54
1922
50
1923
28
1924
29
1925
29
1926
26
1927
39
1928
36
1929
24
1930
34
1931
54
1932
26
1933
36
1934
34
1935
22
1936
21
1937
15
1938
36
1939
39
1940
17
1941
45
1942
22
1943
34
1944
16
1945
30
1946
20
1947
19
1948
33
1949
16
Wettest Day of Each Month
Jul: 59.4 mm (2.3 in)
The wettest day on record for each calendar month at Black Rock. The most was 59.4 mm (2.3 in) on 23 July 1932.
Record daily precipitation for each month at Black Rock
Month
Record daily precipitation (mm)
Date
Jan
20.3 mm (0.8 in)
16 January 1910
Feb
34.5 mm (1.4 in)
24 February 1934
Mar
31.8 mm (1.3 in)
14 March 1941
Apr
25.4 mm (1.0 in)
20 April 1913
May
34.8 mm (1.4 in)
30 May 1934
Jun
29.2 mm (1.1 in)
22 June 1938
Jul
59.4 mm (2.3 in)
23 July 1932
Aug
34.5 mm (1.4 in)
6 August 1918
Sep
35.3 mm (1.4 in)
29 September 1941
Oct
50.8 mm (2.0 in)
5 October 1911
Nov
49.5 mm (1.9 in)
22 November 1931
Dec
29.7 mm (1.2 in)
18 December 1914
Period of Record Coverage
1908 to 1949
Complete yearUnder 90 percent of days
42 years of record at Black Rock, 1908 to 1949. 10 years have data for under 90 percent of days and are left out of rankings: 1908, 1911, 1913, 1914, 1920, 1943, 1946, 1947 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 30 complete years at Black Rock, 1910 to 1945. Blue stripes are years cooler than the station's own mean of 9.8 C (49.7 F); red stripes are warmer. The coolest year was 1912, at 7.7 C (45.9 F), and the warmest was 1910, at 11.3 C (52.4 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Black Rock as warming stripes, 1910 to 1945
Year
Annual mean temperature
Difference from the station mean
1910
11.3 C
+1.50 C
1912
7.7 C
-2.13 C
1915
9.1 C
-0.75 C
1916
9.9 C
+0.04 C
1917
10.5 C
+0.69 C
1918
8.9 C
-0.94 C
1919
7.8 C
-2.01 C
1921
11.0 C
+1.18 C
1924
10.0 C
+0.20 C
1925
10.2 C
+0.32 C
1926
10.3 C
+0.43 C
1927
10.7 C
+0.87 C
1928
10.6 C
+0.77 C
1929
10.0 C
+0.12 C
1930
10.1 C
+0.29 C
1931
10.4 C
+0.53 C
1932
9.4 C
-0.41 C
1933
9.2 C
-0.63 C
1934
10.7 C
+0.86 C
1935
10.3 C
+0.45 C
1936
10.3 C
+0.46 C
1937
9.4 C
-0.41 C
1938
10.1 C
+0.26 C
1939
9.7 C
-0.18 C
1940
9.7 C
-0.11 C
1941
8.4 C
-1.39 C
1942
9.3 C
-0.57 C
1943
10.9 C
+1.09 C
1944
9.6 C
-0.25 C
1945
9.6 C
-0.23 C
The fitted trend in annual mean temperature here over 1910 to 1945 is 0.04 C (-0.29 to 0.37) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.5 to 0.7) per decade. The slope is a straight line fitted to 30 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Black Rock
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.04 C (-0.29 to 0.37) per decade
0.1 F (-0.5 to 0.7) per decade
1910 to 1945
30
Not clearly different from zero
Mean daily maximum
-0.05 C (-0.51 to 0.42) per decade
-0.1 F (-0.9 to 0.8) per decade
1910 to 1945
30
Not clearly different from zero
Mean daily minimum
0.1 C (-0.3 to 0.6) per decade
0.2 F (-0.6 to 1.0) per decade
1910 to 1945
30
Not clearly different from zero
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
1908 to 1949
Yearly extremes at Black Rock: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
39.4 C (102.9 F)
1919
35.0 C (95.0 F)
42
Coldest night (TNn)
-35.0 C (-31.0 F)
1919
-25.6 C (-14.1 F)
42
Wettest day (Rx1day)
59.4 mm (2.3 in)
1932
24.1 mm (0.9 in)
42
Wettest five days (Rx5day)
98.3 mm (3.9 in)
1929
36.8 mm (1.4 in)
42
Longest dry spell (CDD)
117 days
1909
43 days
42
Hottest day (TXx)
The hottest day of the year at Black Rock, 1908 to 1949. The record is 39.4 C (102.9 F) in 1919, marked on the chart; the median year is 35.0 C (95.0 F).
Hottest day (TXx) at Black Rock by year
Year
Hottest day (TXx)
1908
34.4 C (93.9 F)
1909
37.8 C (100.0 F)
1910
35.0 C (95.0 F)
1911
22.8 C (73.0 F)
1912
35.0 C (95.0 F)
1913
28.9 C (84.0 F)
1914
34.4 C (93.9 F)
1915
33.3 C (91.9 F)
1916
33.3 C (91.9 F)
1917
36.7 C (98.1 F)
1918
36.7 C (98.1 F)
1919
39.4 C (102.9 F)
1920
32.8 C (91.0 F)
1921
35.6 C (96.1 F)
1922
37.2 C (99.0 F)
1923
35.0 C (95.0 F)
1924
36.1 C (97.0 F)
1925
35.6 C (96.1 F)
1926
34.4 C (93.9 F)
1927
35.0 C (95.0 F)
1928
35.6 C (96.1 F)
1929
36.1 C (97.0 F)
1930
35.6 C (96.1 F)
1931
36.7 C (98.1 F)
1932
35.6 C (96.1 F)
1933
36.7 C (98.1 F)
1934
33.9 C (93.0 F)
1935
33.9 C (93.0 F)
1936
35.6 C (96.1 F)
1937
35.0 C (95.0 F)
1938
36.1 C (97.0 F)
1939
35.0 C (95.0 F)
1940
35.0 C (95.0 F)
1941
31.1 C (88.0 F)
1942
33.9 C (93.0 F)
1943
35.0 C (95.0 F)
1944
33.9 C (93.0 F)
1945
35.0 C (95.0 F)
1946
35.0 C (95.0 F)
1947
35.0 C (95.0 F)
1948
35.0 C (95.0 F)
1949
32.8 C (91.0 F)
Coldest night (TNn)
The coldest night of the year at Black Rock, 1908 to 1949. The record is -35.0 C (-31.0 F) in 1919, marked on the chart; the median year is -25.6 C (-14.1 F).
Coldest night (TNn) at Black Rock by year
Year
Coldest night (TNn)
1908
-13.3 C (8.1 F)
1909
-29.4 C (-20.9 F)
1910
-31.1 C (-24.0 F)
1911
-29.4 C (-20.9 F)
1912
-24.4 C (-11.9 F)
1913
-30.0 C (-22.0 F)
1914
-18.9 C (-2.0 F)
1915
-24.4 C (-11.9 F)
1916
-27.2 C (-17.0 F)
1917
-18.9 C (-2.0 F)
1918
-27.8 C (-18.0 F)
1919
-35.0 C (-31.0 F)
1920
-25.6 C (-14.1 F)
1921
-23.3 C (-9.9 F)
1922
-25.6 C (-14.1 F)
1923
-16.1 C (3.0 F)
1924
-29.4 C (-20.9 F)
1925
-27.8 C (-18.0 F)
1926
-28.9 C (-20.0 F)
1927
-19.4 C (-2.9 F)
1928
-20.0 C (-4.0 F)
1929
-22.8 C (-9.0 F)
1930
-26.7 C (-16.1 F)
1931
-26.7 C (-16.1 F)
1932
-31.1 C (-24.0 F)
1933
-28.9 C (-20.0 F)
1934
-17.2 C (1.0 F)
1935
-19.4 C (-2.9 F)
1936
-20.6 C (-5.1 F)
1937
-28.3 C (-18.9 F)
1938
-17.2 C (1.0 F)
1939
-27.2 C (-17.0 F)
1940
-15.6 C (3.9 F)
1941
-16.7 C (1.9 F)
1942
-24.4 C (-11.9 F)
1943
-25.6 C (-14.1 F)
1944
-19.4 C (-2.9 F)
1945
-22.2 C (-8.0 F)
1946
-22.8 C (-9.0 F)
1947
-28.3 C (-18.9 F)
1948
-25.6 C (-14.1 F)
1949
-26.7 C (-16.1 F)
Wettest day (Rx1day)
The wettest day of the year at Black Rock, 1908 to 1949. The record is 59.4 mm (2.3 in) in 1932, marked on the chart; the median year is 24.1 mm (0.9 in).
Wettest day (Rx1day) at Black Rock by year
Year
Wettest day (Rx1day)
1908
18.0 mm (0.7 in)
1909
16.0 mm (0.6 in)
1910
20.3 mm (0.8 in)
1911
50.8 mm (2.0 in)
1912
13.5 mm (0.5 in)
1913
25.4 mm (1.0 in)
1914
46.7 mm (1.8 in)
1915
31.5 mm (1.2 in)
1916
34.8 mm (1.4 in)
1917
17.3 mm (0.7 in)
1918
34.5 mm (1.4 in)
1919
30.5 mm (1.2 in)
1920
16.5 mm (0.6 in)
1921
16.3 mm (0.6 in)
1922
29.7 mm (1.2 in)
1923
20.3 mm (0.8 in)
1924
14.0 mm (0.6 in)
1925
22.6 mm (0.9 in)
1926
20.1 mm (0.8 in)
1927
27.7 mm (1.1 in)
1928
24.1 mm (0.9 in)
1929
49.3 mm (1.9 in)
1930
18.5 mm (0.7 in)
1931
49.5 mm (1.9 in)
1932
59.4 mm (2.3 in)
1933
30.0 mm (1.2 in)
1934
34.8 mm (1.4 in)
1935
15.7 mm (0.6 in)
1936
29.0 mm (1.1 in)
1937
21.8 mm (0.9 in)
1938
29.2 mm (1.1 in)
1939
20.3 mm (0.8 in)
1940
24.1 mm (0.9 in)
1941
35.3 mm (1.4 in)
1942
24.4 mm (1.0 in)
1943
22.9 mm (0.9 in)
1944
23.9 mm (0.9 in)
1945
30.5 mm (1.2 in)
1946
30.7 mm (1.2 in)
1947
24.1 mm (0.9 in)
1948
21.6 mm (0.9 in)
1949
18.5 mm (0.7 in)
Wettest five days (Rx5day)
The wettest five days of the year at Black Rock, 1908 to 1949. The record is 98.3 mm (3.9 in) in 1929, marked on the chart; the median year is 36.8 mm (1.4 in).
Wettest five days (Rx5day) at Black Rock by year
Year
Wettest five days (Rx5day)
1908
30.7 mm (1.2 in)
1909
33.8 mm (1.3 in)
1910
42.6 mm (1.7 in)
1911
53.3 mm (2.1 in)
1912
38.9 mm (1.5 in)
1913
26.4 mm (1.0 in)
1914
59.8 mm (2.4 in)
1915
59.0 mm (2.3 in)
1916
70.1 mm (2.8 in)
1917
23.9 mm (0.9 in)
1918
40.6 mm (1.6 in)
1919
53.1 mm (2.1 in)
1920
26.9 mm (1.1 in)
1921
58.2 mm (2.3 in)
1922
45.7 mm (1.8 in)
1923
34.5 mm (1.4 in)
1924
22.9 mm (0.9 in)
1925
34.3 mm (1.4 in)
1926
37.1 mm (1.5 in)
1927
60.9 mm (2.4 in)
1928
32.8 mm (1.3 in)
1929
98.3 mm (3.9 in)
1930
26.4 mm (1.0 in)
1931
62.7 mm (2.5 in)
1932
62.4 mm (2.5 in)
1933
38.9 mm (1.5 in)
1934
44.7 mm (1.8 in)
1935
23.1 mm (0.9 in)
1936
39.1 mm (1.5 in)
1937
36.4 mm (1.4 in)
1938
29.2 mm (1.1 in)
1939
22.3 mm (0.9 in)
1940
30.4 mm (1.2 in)
1941
57.2 mm (2.3 in)
1942
24.4 mm (1.0 in)
1943
25.9 mm (1.0 in)
1944
36.4 mm (1.4 in)
1945
40.9 mm (1.6 in)
1946
42.7 mm (1.7 in)
1947
31.5 mm (1.2 in)
1948
28.1 mm (1.1 in)
1949
18.5 mm (0.7 in)
Longest dry spell (CDD)
The longest dry spell of the year at Black Rock, 1908 to 1949. The record is 117 days in 1909, marked on the chart; the median year is 43 days.
Longest dry spell (CDD) at Black Rock by year
Year
Longest dry spell (CDD)
1908
45 days
1909
117 days
1910
77 days
1911
34 days
1912
47 days
1913
41 days
1914
30 days
1915
41 days
1916
62 days
1917
91 days
1918
47 days
1919
31 days
1920
28 days
1921
42 days
1922
44 days
1923
52 days
1924
65 days
1925
39 days
1926
27 days
1927
33 days
1928
31 days
1929
44 days
1930
33 days
1931
27 days
1932
46 days
1933
45 days
1934
37 days
1935
57 days
1936
30 days
1937
53 days
1938
43 days
1939
87 days
1940
31 days
1941
20 days
1942
62 days
1943
39 days
1944
26 days
1945
56 days
1946
96 days
1947
45 days
1948
38 days
1949
28 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
30 years with a frost
Across 30 years with a frost, the median last spring frost at Black Rock falls on 24 May and the median first autumn frost on 11 October, which leaves a median of 141 days between them.
Fitted over all years, the growing season changes by -1.1 days per decade at this station.
Frost dates and growing season at Black Rock
Measure
Median, all years
Earliest period
Recent period (1910 to 1945)
Recent against earliest
Fitted trend
Last spring frost
24 May
n/a
24 May
n/a
+1.7 days per decade
First autumn frost
11 October
n/a
11 October
n/a
+0.6 days per decade
Growing days
141 days
n/a
141 days
n/a
-1.1 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.
Rainfall Return Levels
35 years, 1909 to 1948
A day with at least 24.8 mm (1.0 in) of rain is expected about once in 2 years. A day with at least 62.7 mm (2.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Black Rock: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
24.8 mm (1.0 in)
5 years
33.7 mm (1.3 in)
10 years
40.1 mm (1.6 in)
25 years
48.7 mm (1.9 in)
50 years
55.5 mm (2.2 in)
Longer than the 35 years of record
100 years
62.7 mm (2.5 in)
Longer than the 35 years of record
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 35 years of values from 1909 to 1948.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 59.4 mm (2.3 in) in 1932; 49.5 mm (1.9 in) in 1931; 49.3 mm (1.9 in) in 1929.
Download the Data
Data for Black Rock standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Black Rock 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.