Record envelope, standing records and threshold days for Ervay (USC00483060), Wyoming, United States, with 43 years of record.
Key Facts for Ervay
Ervay (USC00483060) is a weather station in Wyoming, United States at 42.85 latitude and -107.35 longitude, 2,074 m (6,804 ft) above sea level.
The station reports from 1908 to 1950, 43 years of record.
1,464 records set at Ervay still stand.
Records are tracked for tmax, tmin: an element needs 30 years of data to be eligible.
Ervay set a daily record low minimum temperature of -6.7 C (19.9 F) on 15 October 1943.
About the Station
Location: Wyoming, United States, 42.85 latitude, -107.35 longitude.
Elevation: 2,074 m (6,804 ft).
Period of record: 1908 to 1950, 43 years.
Eligible elements: tmax, tmin.
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 Ervay. 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 Ervay, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
12.2 C (54.0 F)
-38.3 C (-36.9 F)
n/a
n/a
Feb
13.3 C (55.9 F)
-38.9 C (-38.0 F)
n/a
n/a
Mar
25.0 C (77.0 F)
-30.6 C (-23.1 F)
n/a
n/a
Apr
27.8 C (82.0 F)
-25.0 C (-13.0 F)
n/a
n/a
May
32.2 C (90.0 F)
-11.7 C (10.9 F)
n/a
n/a
Jun
33.3 C (91.9 F)
-10.6 C (12.9 F)
n/a
n/a
Jul
37.8 C (100.0 F)
-0.6 C (30.9 F)
n/a
n/a
Aug
36.7 C (98.1 F)
-7.2 C (19.0 F)
n/a
n/a
Sep
32.2 C (90.0 F)
-12.8 C (9.0 F)
n/a
n/a
Oct
27.2 C (81.0 F)
-22.2 C (-8.0 F)
n/a
n/a
Nov
19.4 C (66.9 F)
-32.8 C (-27.0 F)
n/a
n/a
Dec
15.6 C (60.1 F)
-36.7 C (-34.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Ervay still stand. 1910 holds the most, with 83.
Standing records at Ervay by the year they were set
Year set
Standing records
1908
4
1909
48
1910
83
1911
29
1912
36
1913
36
1914
38
1915
41
1916
66
1917
49
1918
56
1919
73
1920
31
1921
41
1922
41
1923
29
1924
42
1925
29
1926
39
1927
32
1928
35
1929
38
1930
18
1931
48
1932
41
1933
53
1934
53
1935
42
1936
56
1937
32
1938
29
1939
50
1940
34
1941
21
1942
29
1943
42
Wettest Day of Each Month
Jul: 106.7 mm (4.2 in)
The wettest day on record for each calendar month at Ervay. The most was 106.7 mm (4.2 in) on 12 July 1936.
Record daily precipitation for each month at Ervay
Month
Record daily precipitation (mm)
Date
Jan
19.3 mm (0.8 in)
24 January 1934
Feb
25.4 mm (1.0 in)
21 February 1913
Mar
30.0 mm (1.2 in)
24 March 1916
Apr
63.5 mm (2.5 in)
6 April 1922
May
73.7 mm (2.9 in)
31 May 1924
Jun
56.9 mm (2.2 in)
2 June 1915
Jul
106.7 mm (4.2 in)
12 July 1936
Aug
49.3 mm (1.9 in)
14 August 1930
Sep
62.7 mm (2.5 in)
27 September 1923
Oct
57.2 mm (2.3 in)
30 October 1922
Nov
27.9 mm (1.1 in)
28 November 1928
Dec
26.7 mm (1.1 in)
3 December 1921
Period of Record Coverage
1908 to 1943
Complete yearUnder 90 percent of days
36 years of record at Ervay, 1908 to 1943. 4 years have data for under 90 percent of days and are left out of rankings: 1908, 1911, 1930, 1943.
Cooler than the station meanWarmer than the station mean
One stripe for each of 24 complete years at Ervay, 1910 to 1942. Blue stripes are years cooler than the station's own mean of 5.5 C (41.9 F); red stripes are warmer. The coolest year was 1912, at 3.8 C (38.8 F), and the warmest was 1910, at 6.9 C (44.5 F). The strongest colour marks a difference of 1.8 C (3.2 F).
Annual mean temperature at Ervay as warming stripes, 1910 to 1942
Year
Annual mean temperature
Difference from the station mean
1910
6.9 C
+1.45 C
1912
3.8 C
-1.72 C
1913
4.3 C
-1.16 C
1914
5.4 C
-0.08 C
1915
5.0 C
-0.51 C
1916
3.9 C
-1.62 C
1918
5.7 C
+0.17 C
1919
6.1 C
+0.61 C
1920
5.0 C
-0.53 C
1922
5.1 C
-0.39 C
1923
4.6 C
-0.89 C
1924
5.0 C
-0.49 C
1925
6.4 C
+0.94 C
1928
5.7 C
+0.23 C
1929
4.5 C
-0.99 C
1931
6.4 C
+0.94 C
1933
6.4 C
+0.89 C
1935
5.7 C
+0.24 C
1936
5.8 C
+0.32 C
1937
4.9 C
-0.57 C
1938
6.0 C
+0.47 C
1939
6.8 C
+1.30 C
1940
6.9 C
+1.43 C
1942
5.4 C
-0.07 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
1908 to 1950
Yearly extremes at Ervay: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
37.8 C (100.0 F)
1925
32.8 C (91.0 F)
36
Coldest night (TNn)
-38.9 C (-38.0 F)
1936
-31.4 C (-24.5 F)
36
Wettest day (Rx1day)
106.7 mm (4.2 in)
1936
38.1 mm (1.5 in)
38
Wettest five days (Rx5day)
175.5 mm (6.9 in)
1937
48.3 mm (1.9 in)
37
Longest dry spell (CDD)
61 days
1950
25 days
38
Hottest day (TXx)
The hottest day of the year at Ervay, 1908 to 1950. The record is 37.8 C (100.0 F) in 1925, marked on the chart; the median year is 32.8 C (91.0 F).
Hottest day (TXx) at Ervay by year
Year
Hottest day (TXx)
1908
22.2 C (72.0 F)
1909
33.3 C (91.9 F)
1910
33.3 C (91.9 F)
1911
30.0 C (86.0 F)
1912
32.2 C (90.0 F)
1913
32.8 C (91.0 F)
1914
31.1 C (88.0 F)
1915
31.7 C (89.1 F)
1916
33.9 C (93.0 F)
1917
33.9 C (93.0 F)
1918
32.8 C (91.0 F)
1919
33.9 C (93.0 F)
1920
32.2 C (90.0 F)
1921
32.2 C (90.0 F)
1922
31.7 C (89.1 F)
1923
32.2 C (90.0 F)
1924
32.2 C (90.0 F)
1925
37.8 C (100.0 F)
1926
31.7 C (89.1 F)
1927
32.8 C (91.0 F)
1928
32.8 C (91.0 F)
1929
33.3 C (91.9 F)
1930
33.3 C (91.9 F)
1931
35.0 C (95.0 F)
1932
32.2 C (90.0 F)
1933
33.9 C (93.0 F)
1934
33.9 C (93.0 F)
1935
36.7 C (98.1 F)
1936
33.3 C (91.9 F)
1937
32.8 C (91.0 F)
1938
32.8 C (91.0 F)
1939
34.4 C (93.9 F)
1940
34.4 C (93.9 F)
1941
33.9 C (93.0 F)
1942
32.2 C (90.0 F)
1943
31.7 C (89.1 F)
1949
n/a
1950
n/a
Coldest night (TNn)
The coldest night of the year at Ervay, 1908 to 1950. The record is -38.9 C (-38.0 F) in 1936, marked on the chart; the median year is -31.4 C (-24.5 F).
Coldest night (TNn) at Ervay by year
Year
Coldest night (TNn)
1908
-23.3 C (-9.9 F)
1909
-28.3 C (-18.9 F)
1910
-36.1 C (-33.0 F)
1911
-28.9 C (-20.0 F)
1912
-27.2 C (-17.0 F)
1913
-35.0 C (-31.0 F)
1914
-32.2 C (-26.0 F)
1915
-26.7 C (-16.1 F)
1916
-38.3 C (-36.9 F)
1917
-30.0 C (-22.0 F)
1918
-31.7 C (-25.1 F)
1919
-36.1 C (-33.0 F)
1920
-30.6 C (-23.1 F)
1921
-22.8 C (-9.0 F)
1922
-33.3 C (-27.9 F)
1923
-35.6 C (-32.1 F)
1924
-36.7 C (-34.1 F)
1925
-20.0 C (-4.0 F)
1926
-33.9 C (-29.0 F)
1927
-31.1 C (-24.0 F)
1928
-27.2 C (-17.0 F)
1929
-31.1 C (-24.0 F)
1930
-38.3 C (-36.9 F)
1931
-24.4 C (-11.9 F)
1932
-33.9 C (-29.0 F)
1933
-37.2 C (-35.0 F)
1934
-28.3 C (-18.9 F)
1935
-29.4 C (-20.9 F)
1936
-38.9 C (-38.0 F)
1937
-31.1 C (-24.0 F)
1938
-32.2 C (-26.0 F)
1939
-32.2 C (-26.0 F)
1940
-28.9 C (-20.0 F)
1941
-28.9 C (-20.0 F)
1942
-31.7 C (-25.1 F)
1943
-37.2 C (-35.0 F)
1949
n/a
1950
n/a
Wettest day (Rx1day)
The wettest day of the year at Ervay, 1908 to 1950. The record is 106.7 mm (4.2 in) in 1936, marked on the chart; the median year is 38.1 mm (1.5 in).
Wettest day (Rx1day) at Ervay by year
Year
Wettest day (Rx1day)
1908
48.0 mm (1.9 in)
1909
38.1 mm (1.5 in)
1910
32.3 mm (1.3 in)
1911
33.0 mm (1.3 in)
1912
48.3 mm (1.9 in)
1913
31.8 mm (1.3 in)
1914
36.8 mm (1.4 in)
1915
56.9 mm (2.2 in)
1916
30.0 mm (1.2 in)
1917
47.0 mm (1.9 in)
1918
36.1 mm (1.4 in)
1919
27.4 mm (1.1 in)
1920
48.3 mm (1.9 in)
1921
35.1 mm (1.4 in)
1922
63.5 mm (2.5 in)
1923
62.7 mm (2.5 in)
1924
73.7 mm (2.9 in)
1925
38.1 mm (1.5 in)
1926
38.1 mm (1.5 in)
1927
63.5 mm (2.5 in)
1928
57.2 mm (2.3 in)
1929
59.7 mm (2.4 in)
1930
54.1 mm (2.1 in)
1931
40.6 mm (1.6 in)
1932
20.3 mm (0.8 in)
1933
61.0 mm (2.4 in)
1934
36.8 mm (1.4 in)
1935
20.1 mm (0.8 in)
1936
106.7 mm (4.2 in)
1937
104.9 mm (4.1 in)
1938
35.6 mm (1.4 in)
1939
35.1 mm (1.4 in)
1940
45.7 mm (1.8 in)
1941
55.9 mm (2.2 in)
1942
36.6 mm (1.4 in)
1943
31.2 mm (1.2 in)
1949
3.0 mm (0.12 in)
1950
29.2 mm (1.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Ervay, 1908 to 1950. The record is 175.5 mm (6.9 in) in 1937, marked on the chart; the median year is 48.3 mm (1.9 in).
Wettest five days (Rx5day) at Ervay by year
Year
Wettest five days (Rx5day)
1908
50.3 mm (2.0 in)
1909
51.6 mm (2.0 in)
1910
48.5 mm (1.9 in)
1911
64.8 mm (2.6 in)
1912
66.0 mm (2.6 in)
1913
34.8 mm (1.4 in)
1914
52.0 mm (2.0 in)
1915
92.0 mm (3.6 in)
1916
34.0 mm (1.3 in)
1917
51.5 mm (2.0 in)
1918
36.1 mm (1.4 in)
1919
36.6 mm (1.4 in)
1920
48.3 mm (1.9 in)
1921
23.8 mm (0.9 in)
1922
n/a
1923
103.4 mm (4.1 in)
1924
17.1 mm (0.7 in)
1925
44.8 mm (1.8 in)
1926
40.5 mm (1.6 in)
1927
36.3 mm (1.4 in)
1928
57.2 mm (2.3 in)
1929
28.9 mm (1.1 in)
1930
112.6 mm (4.4 in)
1931
44.5 mm (1.8 in)
1932
33.3 mm (1.3 in)
1933
113.6 mm (4.5 in)
1934
41.6 mm (1.6 in)
1935
35.6 mm (1.4 in)
1936
119.7 mm (4.7 in)
1937
175.5 mm (6.9 in)
1938
48.3 mm (1.9 in)
1939
56.6 mm (2.2 in)
1940
56.6 mm (2.2 in)
1941
83.5 mm (3.3 in)
1942
71.6 mm (2.8 in)
1943
42.6 mm (1.7 in)
1949
3.0 mm (0.12 in)
1950
29.2 mm (1.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at Ervay, 1908 to 1950. The record is 61 days in 1950, marked on the chart; the median year is 25 days.
Longest dry spell (CDD) at Ervay by year
Year
Longest dry spell (CDD)
1908
22 days
1909
31 days
1910
37 days
1911
26 days
1912
27 days
1913
34 days
1914
44 days
1915
26 days
1916
25 days
1917
43 days
1918
19 days
1919
42 days
1920
25 days
1921
18 days
1922
2 days
1923
12 days
1924
10 days
1925
13 days
1926
19 days
1927
11 days
1928
19 days
1929
25 days
1930
20 days
1931
26 days
1932
33 days
1933
52 days
1934
29 days
1935
38 days
1936
52 days
1937
19 days
1938
17 days
1939
54 days
1940
21 days
1941
20 days
1942
48 days
1943
22 days
1949
13 days
1950
61 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
24 years with a frost
Across 24 years with a frost, the median last spring frost at Ervay falls on 3 June and the median first autumn frost on 6 September, which leaves a median of 95 days between them.
Frost dates and growing season at Ervay
Measure
Median, all years
Earliest period
Recent period (1910 to 1942)
Recent against earliest
Fitted trend
Last spring frost
3 June
n/a
3 June
n/a
n/a
First autumn frost
6 September
n/a
6 September
n/a
n/a
Growing days
95 days
n/a
95 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 Ervay standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Ervay 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.