Record envelope, standing records and threshold days for Grover 2 S (USC00484095), Wyoming, United States, with 55 years of record.
Key Facts for Grover 2 S
Grover 2 S (USC00484095) is a weather station in Wyoming, United States at 42.75 latitude and -110.92 longitude, 1,867 m (6,125 ft) above sea level.
The station reports from 1903 to 1957, 55 years of record.
1,464 records set at Grover 2 S still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Grover 2 S set a daily record precipitation of 6.1 mm (0.24 in) on 12 April 1957.
About the Station
Location: Wyoming, United States, 42.75 latitude, -110.92 longitude.
Elevation: 1,867 m (6,125 ft).
Period of record: 1903 to 1957, 55 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 Grover 2 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 Grover 2 S, 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)
-46.7 C (-52.1 F)
n/a
n/a
Feb
12.8 C (55.0 F)
-44.4 C (-47.9 F)
n/a
n/a
Mar
20.6 C (69.1 F)
-37.2 C (-35.0 F)
n/a
n/a
Apr
27.2 C (81.0 F)
-26.1 C (-15.0 F)
n/a
n/a
May
29.4 C (84.9 F)
-10.6 C (12.9 F)
n/a
n/a
Jun
33.9 C (93.0 F)
-13.3 C (8.1 F)
n/a
n/a
Jul
36.7 C (98.1 F)
-7.8 C (18.0 F)
n/a
n/a
Aug
35.0 C (95.0 F)
-8.9 C (16.0 F)
n/a
n/a
Sep
34.4 C (93.9 F)
-17.2 C (1.0 F)
n/a
n/a
Oct
27.8 C (82.0 F)
-20.6 C (-5.1 F)
n/a
n/a
Nov
27.8 C (82.0 F)
-34.4 C (-29.9 F)
n/a
n/a
Dec
15.6 C (60.1 F)
-48.3 C (-54.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Grover 2 S still stand. 1923 holds the most, with 64.
Standing records at Grover 2 S by the year they were set
Year set
Standing records
1903
22
1904
22
1905
17
1906
35
1907
15
1908
17
1909
7
1910
37
1911
18
1912
23
1913
24
1914
23
1915
17
1916
32
1917
50
1918
37
1919
48
1920
30
1921
27
1922
26
1923
64
1924
35
1925
24
1926
22
1927
25
1928
25
1929
32
1930
37
1931
38
1932
26
1933
26
1934
36
1935
27
1936
27
1937
22
1938
24
1939
51
1940
25
1941
13
1942
17
1943
33
1944
17
1945
30
1946
14
1947
21
1948
24
1949
22
1950
31
1951
19
1952
28
1953
21
1954
27
1955
28
1956
21
1957
5
Wettest Day of Each Month
May: 53.3 mm (2.1 in)
The wettest day on record for each calendar month at Grover 2 S. The most was 53.3 mm (2.1 in) on 13 May 1906.
Record daily precipitation for each month at Grover 2 S
Month
Record daily precipitation (mm)
Date
Jan
31.8 mm (1.3 in)
5 January 1923
Feb
27.9 mm (1.1 in)
28 February 1918
Mar
31.8 mm (1.3 in)
27 March 1936
Apr
40.1 mm (1.6 in)
25 April 1939
May
53.3 mm (2.1 in)
13 May 1906
Jun
36.6 mm (1.4 in)
5 June 1940
Jul
51.1 mm (2.0 in)
11 July 1918
Aug
30.0 mm (1.2 in)
21 August 1906
Sep
35.8 mm (1.4 in)
25 September 1933
Oct
45.7 mm (1.8 in)
4 October 1919
Nov
22.9 mm (0.9 in)
11 November 1944
Dec
42.4 mm (1.7 in)
24 December 1955
Period of Record Coverage
1903 to 1957
Complete yearUnder 90 percent of days
55 years of record at Grover 2 S, 1903 to 1957. 18 years have data for under 90 percent of days and are left out of rankings: 1903, 1905, 1907, 1908, 1909, 1911, 1914, 1915 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 30 complete years at Grover 2 S, 1904 to 1956. Blue stripes are years cooler than the station's own mean of 3.1 C (37.6 F); red stripes are warmer. The coolest year was 1944, at 1.4 C (34.4 F), and the warmest was 1934, at 5.0 C (41.1 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Grover 2 S as warming stripes, 1904 to 1956
Year
Annual mean temperature
Difference from the station mean
1904
5.0 C
+1.85 C
1906
4.3 C
+1.17 C
1910
4.8 C
+1.70 C
1913
3.8 C
+0.61 C
1917
4.3 C
+1.15 C
1920
2.2 C
-0.97 C
1924
1.5 C
-1.62 C
1926
3.7 C
+0.57 C
1927
2.9 C
-0.28 C
1928
2.5 C
-0.60 C
1929
2.4 C
-0.75 C
1931
2.7 C
-0.47 C
1932
1.8 C
-1.33 C
1933
3.6 C
+0.41 C
1934
5.0 C
+1.89 C
1935
1.4 C
-1.70 C
1938
2.6 C
-0.56 C
1942
2.0 C
-1.12 C
1944
1.4 C
-1.79 C
1946
2.8 C
-0.39 C
1947
3.0 C
-0.16 C
1948
3.0 C
-0.13 C
1949
3.5 C
+0.35 C
1950
3.8 C
+0.61 C
1951
2.9 C
-0.29 C
1952
3.1 C
-0.02 C
1953
4.9 C
+1.73 C
1954
4.0 C
+0.82 C
1955
2.7 C
-0.49 C
1956
2.9 C
-0.29 C
The fitted trend in annual mean temperature here over 1904 to 1956 is -0.2 C (-0.4 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.3 F (-0.8 to 0.1) 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 Grover 2 S
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.2 C (-0.4 to 0.1) per decade
-0.3 F (-0.8 to 0.1) per decade
1904 to 1956
30
Not clearly different from zero
Mean daily maximum
-0.2 C (-0.5 to 0.1) per decade
-0.4 F (-0.9 to 0.1) per decade
1904 to 1956
30
Not clearly different from zero
Mean daily minimum
-0.1 C (-0.5 to 0.2) per decade
-0.3 F (-0.9 to 0.3) per decade
1904 to 1956
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
1903 to 1957
Yearly extremes at Grover 2 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)
1934
32.8 C (91.0 F)
55
Coldest night (TNn)
-48.3 C (-54.9 F)
1924
-35.6 C (-32.1 F)
55
Wettest day (Rx1day)
53.3 mm (2.1 in)
1906
26.7 mm (1.1 in)
55
Wettest five days (Rx5day)
118.1 mm (4.6 in)
1918
41.2 mm (1.6 in)
55
Longest dry spell (CDD)
62 days
1952
25 days
55
Hottest day (TXx)
The hottest day of the year at Grover 2 S, 1903 to 1957. The record is 36.7 C (98.1 F) in 1934, marked on the chart; the median year is 32.8 C (91.0 F).
Hottest day (TXx) at Grover 2 S by year
Year
Hottest day (TXx)
1903
32.2 C (90.0 F)
1904
31.1 C (88.0 F)
1905
34.4 C (93.9 F)
1906
31.7 C (89.1 F)
1907
20.6 C (69.1 F)
1908
31.1 C (88.0 F)
1909
30.0 C (86.0 F)
1910
32.8 C (91.0 F)
1911
32.2 C (90.0 F)
1912
31.7 C (89.1 F)
1913
32.8 C (91.0 F)
1914
32.8 C (91.0 F)
1915
35.6 C (96.1 F)
1916
34.4 C (93.9 F)
1917
34.4 C (93.9 F)
1918
32.8 C (91.0 F)
1919
33.9 C (93.0 F)
1920
32.2 C (90.0 F)
1921
33.3 C (91.9 F)
1922
32.2 C (90.0 F)
1923
31.7 C (89.1 F)
1924
33.9 C (93.0 F)
1925
35.0 C (95.0 F)
1926
33.3 C (91.9 F)
1927
32.8 C (91.0 F)
1928
32.8 C (91.0 F)
1929
33.3 C (91.9 F)
1930
32.8 C (91.0 F)
1931
36.1 C (97.0 F)
1932
32.8 C (91.0 F)
1933
35.0 C (95.0 F)
1934
36.7 C (98.1 F)
1935
33.9 C (93.0 F)
1936
32.8 C (91.0 F)
1937
33.3 C (91.9 F)
1938
31.1 C (88.0 F)
1939
35.0 C (95.0 F)
1940
35.0 C (95.0 F)
1941
32.2 C (90.0 F)
1942
32.2 C (90.0 F)
1943
32.2 C (90.0 F)
1944
30.6 C (87.1 F)
1945
32.2 C (90.0 F)
1946
33.3 C (91.9 F)
1947
32.8 C (91.0 F)
1948
33.3 C (91.9 F)
1949
34.4 C (93.9 F)
1950
33.3 C (91.9 F)
1951
32.2 C (90.0 F)
1952
31.1 C (88.0 F)
1953
31.7 C (89.1 F)
1954
33.3 C (91.9 F)
1955
33.9 C (93.0 F)
1956
32.2 C (90.0 F)
1957
18.3 C (64.9 F)
Coldest night (TNn)
The coldest night of the year at Grover 2 S, 1903 to 1957. The record is -48.3 C (-54.9 F) in 1924, marked on the chart; the median year is -35.6 C (-32.1 F).
Coldest night (TNn) at Grover 2 S by year
Year
Coldest night (TNn)
1903
-28.9 C (-20.0 F)
1904
-31.1 C (-24.0 F)
1905
-40.6 C (-41.1 F)
1906
-29.4 C (-20.9 F)
1907
-35.6 C (-32.1 F)
1908
-33.3 C (-27.9 F)
1909
-33.3 C (-27.9 F)
1910
-34.4 C (-29.9 F)
1911
-35.0 C (-31.0 F)
1912
-32.2 C (-26.0 F)
1913
-32.8 C (-27.0 F)
1914
-30.6 C (-23.1 F)
1915
-37.8 C (-36.0 F)
1916
-28.3 C (-18.9 F)
1917
-43.9 C (-47.0 F)
1918
-32.2 C (-26.0 F)
1919
-42.2 C (-44.0 F)
1920
-43.3 C (-45.9 F)
1921
-37.8 C (-36.0 F)
1922
-41.1 C (-42.0 F)
1923
-38.9 C (-38.0 F)
1924
-48.3 C (-54.9 F)
1925
-30.0 C (-22.0 F)
1926
-31.7 C (-25.1 F)
1927
-43.3 C (-45.9 F)
1928
-35.0 C (-31.0 F)
1929
-41.7 C (-43.1 F)
1930
-43.3 C (-45.9 F)
1931
-36.1 C (-33.0 F)
1932
-37.8 C (-36.0 F)
1933
-44.4 C (-47.9 F)
1934
-30.6 C (-23.1 F)
1935
-37.2 C (-35.0 F)
1936
-40.0 C (-40.0 F)
1937
-46.7 C (-52.1 F)
1938
-32.2 C (-26.0 F)
1939
-33.9 C (-29.0 F)
1940
-36.7 C (-34.1 F)
1941
-35.6 C (-32.1 F)
1942
-44.4 C (-47.9 F)
1943
-36.7 C (-34.1 F)
1944
-34.4 C (-29.9 F)
1945
-37.8 C (-36.0 F)
1946
-34.4 C (-29.9 F)
1947
-33.9 C (-29.0 F)
1948
-37.8 C (-36.0 F)
1949
-38.9 C (-38.0 F)
1950
-33.9 C (-29.0 F)
1951
-37.8 C (-36.0 F)
1952
-32.8 C (-27.0 F)
1953
-27.2 C (-17.0 F)
1954
-31.7 C (-25.1 F)
1955
-35.0 C (-31.0 F)
1956
-38.3 C (-36.9 F)
1957
-33.3 C (-27.9 F)
Wettest day (Rx1day)
The wettest day of the year at Grover 2 S, 1903 to 1957. The record is 53.3 mm (2.1 in) in 1906, marked on the chart; the median year is 26.7 mm (1.1 in).
Wettest day (Rx1day) at Grover 2 S by year
Year
Wettest day (Rx1day)
1903
33.0 mm (1.3 in)
1904
19.6 mm (0.8 in)
1905
19.1 mm (0.8 in)
1906
53.3 mm (2.1 in)
1907
17.8 mm (0.7 in)
1908
25.4 mm (1.0 in)
1909
14.5 mm (0.6 in)
1910
14.5 mm (0.6 in)
1911
20.3 mm (0.8 in)
1912
24.1 mm (0.9 in)
1913
15.2 mm (0.6 in)
1914
33.0 mm (1.3 in)
1915
31.8 mm (1.3 in)
1916
17.8 mm (0.7 in)
1917
35.3 mm (1.4 in)
1918
51.1 mm (2.0 in)
1919
45.7 mm (1.8 in)
1920
21.6 mm (0.9 in)
1921
19.1 mm (0.8 in)
1922
26.9 mm (1.1 in)
1923
31.8 mm (1.3 in)
1924
27.9 mm (1.1 in)
1925
22.9 mm (0.9 in)
1926
21.6 mm (0.9 in)
1927
27.9 mm (1.1 in)
1928
25.4 mm (1.0 in)
1929
22.9 mm (0.9 in)
1930
29.7 mm (1.2 in)
1931
14.2 mm (0.6 in)
1932
26.7 mm (1.1 in)
1933
35.8 mm (1.4 in)
1934
17.0 mm (0.7 in)
1935
17.5 mm (0.7 in)
1936
31.8 mm (1.3 in)
1937
42.2 mm (1.7 in)
1938
29.7 mm (1.2 in)
1939
40.1 mm (1.6 in)
1940
38.4 mm (1.5 in)
1941
16.3 mm (0.6 in)
1942
31.2 mm (1.2 in)
1943
19.1 mm (0.8 in)
1944
22.9 mm (0.9 in)
1945
27.7 mm (1.1 in)
1946
25.7 mm (1.0 in)
1947
22.9 mm (0.9 in)
1948
27.4 mm (1.1 in)
1949
28.4 mm (1.1 in)
1950
30.5 mm (1.2 in)
1951
23.4 mm (0.9 in)
1952
27.9 mm (1.1 in)
1953
33.5 mm (1.3 in)
1954
28.7 mm (1.1 in)
1955
42.4 mm (1.7 in)
1956
21.8 mm (0.9 in)
1957
14.0 mm (0.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Grover 2 S, 1903 to 1957. The record is 118.1 mm (4.6 in) in 1918, marked on the chart; the median year is 41.2 mm (1.6 in).
Wettest five days (Rx5day) at Grover 2 S by year
Year
Wettest five days (Rx5day)
1903
37.4 mm (1.5 in)
1904
41.3 mm (1.6 in)
1905
40.6 mm (1.6 in)
1906
83.8 mm (3.3 in)
1907
57.1 mm (2.2 in)
1908
43.2 mm (1.7 in)
1909
34.3 mm (1.4 in)
1910
22.1 mm (0.9 in)
1911
41.2 mm (1.6 in)
1912
40.7 mm (1.6 in)
1913
46.2 mm (1.8 in)
1914
63.5 mm (2.5 in)
1915
39.4 mm (1.6 in)
1916
42.5 mm (1.7 in)
1917
73.2 mm (2.9 in)
1918
118.1 mm (4.6 in)
1919
45.7 mm (1.8 in)
1920
28.7 mm (1.1 in)
1921
40.4 mm (1.6 in)
1922
27.2 mm (1.1 in)
1923
29.2 mm (1.1 in)
1924
31.0 mm (1.2 in)
1925
37.4 mm (1.5 in)
1926
54.7 mm (2.2 in)
1927
45.4 mm (1.8 in)
1928
28.0 mm (1.1 in)
1929
40.7 mm (1.6 in)
1930
52.8 mm (2.1 in)
1931
29.5 mm (1.2 in)
1932
35.8 mm (1.4 in)
1933
39.6 mm (1.6 in)
1934
34.7 mm (1.4 in)
1935
34.5 mm (1.4 in)
1936
52.8 mm (2.1 in)
1937
69.9 mm (2.8 in)
1938
46.7 mm (1.8 in)
1939
40.1 mm (1.6 in)
1940
55.2 mm (2.2 in)
1941
43.7 mm (1.7 in)
1942
37.3 mm (1.5 in)
1943
34.7 mm (1.4 in)
1944
50.3 mm (2.0 in)
1945
54.9 mm (2.2 in)
1946
36.9 mm (1.5 in)
1947
41.6 mm (1.6 in)
1948
82.8 mm (3.3 in)
1949
59.5 mm (2.3 in)
1950
45.0 mm (1.8 in)
1951
49.9 mm (2.0 in)
1952
45.4 mm (1.8 in)
1953
33.5 mm (1.3 in)
1954
40.7 mm (1.6 in)
1955
75.1 mm (3.0 in)
1956
33.0 mm (1.3 in)
1957
19.1 mm (0.8 in)
Longest dry spell (CDD)
The longest dry spell of the year at Grover 2 S, 1903 to 1957. The record is 62 days in 1952, marked on the chart; the median year is 25 days.
Longest dry spell (CDD) at Grover 2 S by year
Year
Longest dry spell (CDD)
1903
19 days
1904
32 days
1905
18 days
1906
23 days
1907
11 days
1908
17 days
1909
19 days
1910
31 days
1911
37 days
1912
17 days
1913
22 days
1914
40 days
1915
21 days
1916
23 days
1917
44 days
1918
42 days
1919
52 days
1920
25 days
1921
33 days
1922
31 days
1923
6 days
1924
2 days
1925
4 days
1926
23 days
1927
23 days
1928
31 days
1929
19 days
1930
12 days
1931
37 days
1932
39 days
1933
36 days
1934
25 days
1935
34 days
1936
33 days
1937
25 days
1938
14 days
1939
51 days
1940
37 days
1941
14 days
1942
30 days
1943
25 days
1944
43 days
1945
22 days
1946
30 days
1947
26 days
1948
25 days
1949
36 days
1950
41 days
1951
23 days
1952
62 days
1953
41 days
1954
35 days
1955
22 days
1956
37 days
1957
10 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 Grover 2 S falls on 26 June and the median first autumn frost on 5 July, which leaves a median of 10 days between them.
Fitted over all years, the growing season changes by -5.4 days per decade at this station.
Frost dates and growing season at Grover 2 S
Measure
Median, all years
Earliest period
Recent period (1904 to 1956)
Recent against earliest
Fitted trend
Last spring frost
26 June
n/a
26 June
n/a
+1.6 days per decade
First autumn frost
5 July
n/a
5 July
n/a
-3.8 days per decade
Growing days
10 days
n/a
10 days
n/a
-5.4 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
31 years, 1904 to 1956
A day with at least 26.6 mm (1.0 in) of rain is expected about once in 2 years. A day with at least 59.2 mm (2.3 in) of rain is expected about once in 100 years.
Rainfall return levels at Grover 2 S: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
26.6 mm (1.0 in)
5 years
35.1 mm (1.4 in)
10 years
40.9 mm (1.6 in)
25 years
48.2 mm (1.9 in)
50 years
53.7 mm (2.1 in)
Longer than the 31 years of record
100 years
59.2 mm (2.3 in)
Longer than the 31 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, 31 years of values from 1904 to 1956.
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: 53.3 mm (2.1 in) in 1906; 51.1 mm (2.0 in) in 1918; 42.4 mm (1.7 in) in 1955.
Download the Data
Data for Grover 2 S standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Grover 2 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.