Record envelope, standing records and threshold days for Clark 4 SW (USC00481770), Wyoming, United States, with 54 years of record.
Key Facts for Clark 4 SW
Clark 4 SW (USC00481770) is a weather station in Wyoming, United States at 44.90 latitude and -109.23 longitude, 1,382 m (4,534 ft) above sea level.
The station reports from 1905 to 1958, 54 years of record.
1,464 records set at Clark 4 SW still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Clark 4 SW set a daily record low minimum temperature of -8.9 C (16.0 F) on 26 April 1958.
About the Station
Location: Wyoming, United States, 44.90 latitude, -109.23 longitude.
Elevation: 1,382 m (4,534 ft).
Period of record: 1905 to 1958, 54 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 Clark 4 SW. 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 Clark 4 SW, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
18.3 C (64.9 F)
-41.1 C (-42.0 F)
n/a
n/a
Feb
21.1 C (70.0 F)
-36.1 C (-33.0 F)
n/a
n/a
Mar
26.7 C (80.1 F)
-27.8 C (-18.0 F)
n/a
n/a
Apr
29.4 C (84.9 F)
-21.7 C (-7.1 F)
n/a
n/a
May
34.4 C (93.9 F)
-7.8 C (18.0 F)
n/a
n/a
Jun
38.3 C (100.9 F)
-1.7 C (28.9 F)
n/a
n/a
Jul
40.6 C (105.1 F)
2.2 C (36.0 F)
n/a
n/a
Aug
38.9 C (102.0 F)
-1.1 C (30.0 F)
n/a
n/a
Sep
35.6 C (96.1 F)
-11.1 C (12.0 F)
n/a
n/a
Oct
31.1 C (88.0 F)
-22.8 C (-9.0 F)
n/a
n/a
Nov
25.6 C (78.1 F)
-25.6 C (-14.1 F)
n/a
n/a
Dec
23.3 C (73.9 F)
-35.0 C (-31.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Clark 4 SW still stand. 1936 holds the most, with 65.
Standing records at Clark 4 SW by the year they were set
Year set
Standing records
1906
42
1907
28
1908
39
1909
37
1910
60
1911
36
1912
30
1913
24
1914
35
1915
21
1916
49
1917
29
1918
54
1919
55
1920
21
1921
48
1922
35
1923
20
1924
42
1925
21
1926
46
1927
30
1928
13
1929
12
1930
21
1931
23
1932
18
1933
6
1935
34
1936
65
1937
24
1938
18
1939
45
1940
17
1941
42
1942
11
1943
25
1947
13
1948
30
1949
30
1950
36
1951
30
1952
20
1953
26
1954
23
1955
33
1956
26
1957
12
1958
9
Wettest Day of Each Month
May: 34.3 mm (1.4 in)
The wettest day on record for each calendar month at Clark 4 SW. The most was 34.3 mm (1.4 in) on 24 May 1939.
Record daily precipitation for each month at Clark 4 SW
Month
Record daily precipitation (mm)
Date
Jan
15.0 mm (0.6 in)
14 January 1928
Feb
13.0 mm (0.5 in)
6 February 1916
Mar
31.8 mm (1.3 in)
9 March 1956
Apr
27.9 mm (1.1 in)
22 April 1958
May
34.3 mm (1.4 in)
24 May 1939
Jun
30.7 mm (1.2 in)
16 June 1957
Jul
30.0 mm (1.2 in)
10 July 1951
Aug
15.2 mm (0.6 in)
3 August 1912
Sep
30.7 mm (1.2 in)
26 September 1915
Oct
19.8 mm (0.8 in)
13 October 1942
Nov
31.0 mm (1.2 in)
21 November 1921
Dec
23.1 mm (0.9 in)
23 December 1915
Period of Record Coverage
1906 to 1958
Complete yearUnder 90 percent of days
49 years of record at Clark 4 SW, 1906 to 1958. 14 years have data for under 90 percent of days and are left out of rankings: 1906, 1928, 1929, 1930, 1931, 1932, 1933, 1938 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 28 complete years at Clark 4 SW, 1907 to 1957. Blue stripes are years cooler than the station's own mean of 8.2 C (46.8 F); red stripes are warmer. The coolest year was 1951, at 6.6 C (43.9 F), and the warmest was 1910, at 9.8 C (49.6 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at Clark 4 SW as warming stripes, 1907 to 1957
Year
Annual mean temperature
Difference from the station mean
1907
8.1 C
-0.11 C
1908
8.7 C
+0.45 C
1909
7.6 C
-0.63 C
1910
9.8 C
+1.55 C
1911
7.8 C
-0.46 C
1912
7.3 C
-0.96 C
1913
7.4 C
-0.85 C
1914
9.0 C
+0.74 C
1915
8.5 C
+0.23 C
1918
8.3 C
+0.10 C
1919
8.1 C
-0.15 C
1920
7.8 C
-0.44 C
1921
9.1 C
+0.87 C
1922
7.4 C
-0.87 C
1923
7.5 C
-0.71 C
1925
8.5 C
+0.31 C
1926
8.4 C
+0.22 C
1936
8.6 C
+0.33 C
1937
8.1 C
-0.08 C
1939
9.6 C
+1.42 C
1940
9.2 C
+0.93 C
1948
8.2 C
-0.04 C
1950
7.5 C
-0.70 C
1951
6.6 C
-1.63 C
1952
8.9 C
+0.71 C
1955
7.6 C
-0.60 C
1956
8.6 C
+0.41 C
1957
8.1 C
-0.11 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
1905 to 1958
Yearly extremes at Clark 4 SW: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
40.6 C (105.1 F)
1926
36.1 C (97.0 F)
49
Coldest night (TNn)
-41.1 C (-42.0 F)
1935
-29.4 C (-20.9 F)
49
Wettest day (Rx1day)
34.3 mm (1.4 in)
1939
20.2 mm (0.8 in)
50
Wettest five days (Rx5day)
59.4 mm (2.3 in)
1921
32.5 mm (1.3 in)
50
Longest dry spell (CDD)
61 days
1914
33 days
50
Hottest day (TXx)
The hottest day of the year at Clark 4 SW, 1905 to 1958. The record is 40.6 C (105.1 F) in 1926, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Clark 4 SW by year
Year
Hottest day (TXx)
1905
n/a
1906
35.6 C (96.1 F)
1907
34.4 C (93.9 F)
1908
37.8 C (100.0 F)
1909
37.8 C (100.0 F)
1910
38.9 C (102.0 F)
1911
35.0 C (95.0 F)
1912
37.2 C (99.0 F)
1913
35.6 C (96.1 F)
1914
36.1 C (97.0 F)
1915
34.4 C (93.9 F)
1916
36.7 C (98.1 F)
1917
36.1 C (97.0 F)
1918
37.8 C (100.0 F)
1919
38.3 C (100.9 F)
1920
37.2 C (99.0 F)
1921
37.8 C (100.0 F)
1922
36.1 C (97.0 F)
1923
35.6 C (96.1 F)
1924
35.0 C (95.0 F)
1925
39.4 C (102.9 F)
1926
40.6 C (105.1 F)
1927
33.3 C (91.9 F)
1928
37.2 C (99.0 F)
1929
36.1 C (97.0 F)
1930
37.2 C (99.0 F)
1931
36.7 C (98.1 F)
1932
34.4 C (93.9 F)
1933
12.2 C (54.0 F)
1935
36.1 C (97.0 F)
1936
36.1 C (97.0 F)
1937
37.8 C (100.0 F)
1938
30.6 C (87.1 F)
1939
37.8 C (100.0 F)
1940
36.7 C (98.1 F)
1941
37.8 C (100.0 F)
1942
35.0 C (95.0 F)
1943
35.6 C (96.1 F)
1947
35.0 C (95.0 F)
1948
36.1 C (97.0 F)
1949
36.7 C (98.1 F)
1950
32.8 C (91.0 F)
1951
35.0 C (95.0 F)
1952
35.6 C (96.1 F)
1953
36.7 C (98.1 F)
1954
37.8 C (100.0 F)
1955
38.3 C (100.9 F)
1956
38.3 C (100.9 F)
1957
36.7 C (98.1 F)
1958
27.2 C (81.0 F)
Coldest night (TNn)
The coldest night of the year at Clark 4 SW, 1905 to 1958. The record is -41.1 C (-42.0 F) in 1935, marked on the chart; the median year is -29.4 C (-20.9 F).
Coldest night (TNn) at Clark 4 SW by year
Year
Coldest night (TNn)
1905
n/a
1906
-16.7 C (1.9 F)
1907
-28.9 C (-20.0 F)
1908
-25.0 C (-13.0 F)
1909
-30.6 C (-23.1 F)
1910
-30.6 C (-23.1 F)
1911
-28.3 C (-18.9 F)
1912
-28.3 C (-18.9 F)
1913
-26.1 C (-15.0 F)
1914
-30.0 C (-22.0 F)
1915
-22.8 C (-9.0 F)
1916
-32.8 C (-27.0 F)
1917
-33.3 C (-27.9 F)
1918
-30.6 C (-23.1 F)
1919
-33.3 C (-27.9 F)
1920
-25.0 C (-13.0 F)
1921
-25.6 C (-14.1 F)
1922
-29.4 C (-20.9 F)
1923
-35.0 C (-31.0 F)
1924
-35.0 C (-31.0 F)
1925
-22.8 C (-9.0 F)
1926
-29.4 C (-20.9 F)
1927
-32.8 C (-27.0 F)
1928
-31.1 C (-24.0 F)
1929
-9.4 C (15.1 F)
1930
-22.2 C (-8.0 F)
1931
-19.4 C (-2.9 F)
1932
-30.0 C (-22.0 F)
1933
-32.8 C (-27.0 F)
1935
-41.1 C (-42.0 F)
1936
-36.1 C (-33.0 F)
1937
-32.8 C (-27.0 F)
1938
-25.6 C (-14.1 F)
1939
-31.1 C (-24.0 F)
1940
-30.0 C (-22.0 F)
1941
-23.9 C (-11.0 F)
1942
-33.9 C (-29.0 F)
1943
-25.6 C (-14.1 F)
1947
-17.2 C (1.0 F)
1948
-27.8 C (-18.0 F)
1949
-32.2 C (-26.0 F)
1950
-31.7 C (-25.1 F)
1951
-34.4 C (-29.9 F)
1952
-26.1 C (-15.0 F)
1953
-19.4 C (-2.9 F)
1954
-15.6 C (3.9 F)
1955
-27.8 C (-18.0 F)
1956
-29.4 C (-20.9 F)
1957
-31.1 C (-24.0 F)
1958
-16.7 C (1.9 F)
Wettest day (Rx1day)
The wettest day of the year at Clark 4 SW, 1905 to 1958. The record is 34.3 mm (1.4 in) in 1939, marked on the chart; the median year is 20.2 mm (0.8 in).
Wettest day (Rx1day) at Clark 4 SW by year
Year
Wettest day (Rx1day)
1905
21.6 mm (0.9 in)
1906
24.6 mm (1.0 in)
1907
20.6 mm (0.8 in)
1908
19.6 mm (0.8 in)
1909
30.5 mm (1.2 in)
1910
33.5 mm (1.3 in)
1911
19.3 mm (0.8 in)
1912
19.6 mm (0.8 in)
1913
13.7 mm (0.5 in)
1914
29.7 mm (1.2 in)
1915
30.7 mm (1.2 in)
1916
17.0 mm (0.7 in)
1917
21.3 mm (0.8 in)
1918
27.4 mm (1.1 in)
1919
18.3 mm (0.7 in)
1920
13.7 mm (0.5 in)
1921
31.0 mm (1.2 in)
1922
21.6 mm (0.9 in)
1923
15.0 mm (0.6 in)
1924
20.6 mm (0.8 in)
1925
22.9 mm (0.9 in)
1926
25.9 mm (1.0 in)
1927
20.6 mm (0.8 in)
1928
19.8 mm (0.8 in)
1929
13.2 mm (0.5 in)
1930
14.0 mm (0.6 in)
1931
25.9 mm (1.0 in)
1932
9.9 mm (0.39 in)
1933
8.9 mm (0.35 in)
1935
12.4 mm (0.5 in)
1936
19.1 mm (0.8 in)
1937
20.8 mm (0.8 in)
1938
27.2 mm (1.1 in)
1939
34.3 mm (1.4 in)
1940
21.6 mm (0.9 in)
1941
15.5 mm (0.6 in)
1942
19.8 mm (0.8 in)
1943
15.2 mm (0.6 in)
1947
9.1 mm (0.36 in)
1948
18.0 mm (0.7 in)
1949
19.6 mm (0.8 in)
1950
21.6 mm (0.9 in)
1951
30.0 mm (1.2 in)
1952
18.8 mm (0.7 in)
1953
15.0 mm (0.6 in)
1954
10.9 mm (0.4 in)
1955
19.6 mm (0.8 in)
1956
31.8 mm (1.3 in)
1957
30.7 mm (1.2 in)
1958
27.9 mm (1.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Clark 4 SW, 1905 to 1958. The record is 59.4 mm (2.3 in) in 1921, marked on the chart; the median year is 32.5 mm (1.3 in).
Wettest five days (Rx5day) at Clark 4 SW by year
Year
Wettest five days (Rx5day)
1905
38.2 mm (1.5 in)
1906
37.8 mm (1.5 in)
1907
35.3 mm (1.4 in)
1908
40.2 mm (1.6 in)
1909
39.1 mm (1.5 in)
1910
37.6 mm (1.5 in)
1911
26.2 mm (1.0 in)
1912
25.9 mm (1.0 in)
1913
28.5 mm (1.1 in)
1914
37.8 mm (1.5 in)
1915
49.2 mm (1.9 in)
1916
21.6 mm (0.9 in)
1917
42.1 mm (1.7 in)
1918
32.1 mm (1.3 in)
1919
20.6 mm (0.8 in)
1920
20.6 mm (0.8 in)
1921
59.4 mm (2.3 in)
1922
36.6 mm (1.4 in)
1923
42.0 mm (1.7 in)
1924
28.2 mm (1.1 in)
1925
33.3 mm (1.3 in)
1926
41.1 mm (1.6 in)
1927
36.0 mm (1.4 in)
1928
43.0 mm (1.7 in)
1929
17.5 mm (0.7 in)
1930
24.9 mm (1.0 in)
1931
26.4 mm (1.0 in)
1932
12.4 mm (0.5 in)
1933
9.9 mm (0.39 in)
1935
33.8 mm (1.3 in)
1936
28.7 mm (1.1 in)
1937
25.4 mm (1.0 in)
1938
48.0 mm (1.9 in)
1939
39.6 mm (1.6 in)
1940
28.5 mm (1.1 in)
1941
24.7 mm (1.0 in)
1942
23.1 mm (0.9 in)
1943
17.0 mm (0.7 in)
1947
11.7 mm (0.5 in)
1948
18.6 mm (0.7 in)
1949
33.5 mm (1.3 in)
1950
32.8 mm (1.3 in)
1951
41.9 mm (1.6 in)
1952
47.5 mm (1.9 in)
1953
20.6 mm (0.8 in)
1954
26.5 mm (1.0 in)
1955
35.4 mm (1.4 in)
1956
31.8 mm (1.3 in)
1957
52.7 mm (2.1 in)
1958
29.5 mm (1.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Clark 4 SW, 1905 to 1958. The record is 61 days in 1914, marked on the chart; the median year is 33 days.
Longest dry spell (CDD) at Clark 4 SW by year
Year
Longest dry spell (CDD)
1905
30 days
1906
26 days
1907
28 days
1908
51 days
1909
39 days
1910
42 days
1911
26 days
1912
54 days
1913
47 days
1914
61 days
1915
30 days
1916
31 days
1917
29 days
1918
30 days
1919
36 days
1920
23 days
1921
45 days
1922
37 days
1923
22 days
1924
31 days
1925
24 days
1926
25 days
1927
29 days
1928
18 days
1929
19 days
1930
9 days
1931
12 days
1932
35 days
1933
16 days
1935
53 days
1936
33 days
1937
35 days
1938
47 days
1939
55 days
1940
24 days
1941
50 days
1942
46 days
1943
36 days
1947
24 days
1948
48 days
1949
30 days
1950
29 days
1951
37 days
1952
48 days
1953
33 days
1954
43 days
1955
50 days
1956
48 days
1957
32 days
1958
34 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
28 years with a frost
Across 28 years with a frost, the median last spring frost at Clark 4 SW falls on 5 May and the median first autumn frost on 28 September, which leaves a median of 148 days between them.
Fitted over all years, the growing season changes by -3.0 days per decade at this station.
Frost dates and growing season at Clark 4 SW
Measure
Median, all years
Earliest period
Recent period (1907 to 1957)
Recent against earliest
Fitted trend
Last spring frost
5 May
n/a
5 May
n/a
+1.6 days per decade
First autumn frost
28 September
n/a
28 September
n/a
-1.5 days per decade
Growing days
148 days
n/a
148 days
n/a
-3.0 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
33 years, 1906 to 1957
A day with at least 22.1 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 40.4 mm (1.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Clark 4 SW: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
22.1 mm (0.9 in)
5 years
27.9 mm (1.1 in)
10 years
31.3 mm (1.2 in)
25 years
35.2 mm (1.4 in)
50 years
37.9 mm (1.5 in)
Longer than the 33 years of record
100 years
40.4 mm (1.6 in)
Longer than the 33 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, 33 years of values from 1906 to 1957.
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: 34.3 mm (1.4 in) in 1939; 33.5 mm (1.3 in) in 1910; 31.8 mm (1.3 in) in 1956.
Download the Data
Data for Clark 4 SW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Clark 4 SW 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.