Record envelope, standing records and threshold days for Mt Vernon 3 WNW (USC00455678), Washington, United States, with 50 years of record.
Key Facts for Mt Vernon 3 WNW
Mt Vernon 3 WNW (USC00455678) is a weather station in Washington, United States at 48.44 latitude and -122.39 longitude, 4 m (14 ft) above sea level.
The station reports from 1956 to 2005, 50 years of record.
1,464 records set at Mt Vernon 3 WNW still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Mt Vernon 3 WNW tied a daily record high minimum temperature of 8.9 C (48.0 F) on 27 January 2005.
About the Station
Location: Washington, United States, 48.44 latitude, -122.39 longitude.
Elevation: 4 m (14 ft).
Period of record: 1956 to 2005, 50 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
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 Mt Vernon 3 WNW. 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 Mt Vernon 3 WNW, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
18.9 C (66.0 F)
-20.0 C (-4.0 F)
n/a
n/a
Feb
21.7 C (71.1 F)
-13.9 C (7.0 F)
n/a
n/a
Mar
26.7 C (80.1 F)
-12.8 C (9.0 F)
n/a
n/a
Apr
26.7 C (80.1 F)
-3.9 C (25.0 F)
n/a
n/a
May
31.7 C (89.1 F)
0.0 C (32.0 F)
n/a
n/a
Jun
33.3 C (91.9 F)
3.3 C (37.9 F)
n/a
n/a
Jul
34.4 C (93.9 F)
3.3 C (37.9 F)
n/a
n/a
Aug
36.7 C (98.1 F)
2.2 C (36.0 F)
n/a
n/a
Sep
31.7 C (89.1 F)
-1.7 C (28.9 F)
n/a
n/a
Oct
28.3 C (82.9 F)
-7.2 C (19.0 F)
n/a
n/a
Nov
21.7 C (71.1 F)
-13.9 C (7.0 F)
n/a
n/a
Dec
18.3 C (64.9 F)
-18.3 C (-0.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Mt Vernon 3 WNW still stand. 1958 holds the most, with 52.
Standing records at Mt Vernon 3 WNW by the year they were set
Year set
Standing records
1956
45
1957
44
1958
52
1959
30
1960
30
1961
31
1962
38
1963
48
1964
41
1965
30
1966
33
1967
26
1968
34
1969
34
1970
24
1971
33
1972
43
1973
28
1974
26
1975
23
1976
25
1977
19
1978
21
1979
26
1980
37
1981
28
1982
28
1983
34
1984
21
1985
42
1986
31
1987
29
1988
18
1989
30
1990
33
1991
24
1992
32
1993
28
1994
20
1995
39
1996
30
1997
26
1998
14
1999
17
2000
8
2001
16
2002
35
2003
26
2004
24
2005
10
All-Time Record Progression
1 new records
1 all-time records were set at Mt Vernon 3 WNW between 9 November 1990 and 9 November 1990. Each dot is a new record.
When Mt Vernon 3 WNW set new all-time records
Date
Kind
Detail
1990-11-09
Record daily precipitation
Record daily precipitation 76.5 mm (3.0 in)
Wettest Day of Each Month
Nov: 76.5 mm (3.0 in)
The wettest day on record for each calendar month at Mt Vernon 3 WNW. The most was 76.5 mm (3.0 in) on 9 November 1990.
Record daily precipitation for each month at Mt Vernon 3 WNW
Month
Record daily precipitation (mm)
Date
Jan
52.3 mm (2.1 in)
23 January 1982
Feb
41.1 mm (1.6 in)
23 February 1986
Mar
31.2 mm (1.2 in)
20 March 1984
Apr
44.7 mm (1.8 in)
13 April 2000
May
47.2 mm (1.9 in)
16 May 1988
Jun
51.6 mm (2.0 in)
6 June 1990
Jul
40.1 mm (1.6 in)
16 July 1986
Aug
70.1 mm (2.8 in)
24 August 2004
Sep
61.7 mm (2.4 in)
1 September 1983
Oct
38.4 mm (1.5 in)
20 October 2003
Nov
76.5 mm (3.0 in)
9 November 1990
Dec
52.1 mm (2.1 in)
24 December 1967
Period of Record Coverage
1956 to 2005
Complete yearUnder 90 percent of days
50 years of record at Mt Vernon 3 WNW, 1956 to 2005. 4 years have data for under 90 percent of days and are left out of rankings: 2000, 2002, 2003, 2005.
Cooler than the station meanWarmer than the station mean
One stripe for each of 43 complete years at Mt Vernon 3 WNW, 1956 to 2004. Blue stripes are years cooler than the station's own mean of 10.2 C (50.4 F); red stripes are warmer. The coolest year was 1985, at 9.0 C (48.1 F), and the warmest was 1958, at 11.7 C (53.1 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Mt Vernon 3 WNW as warming stripes, 1956 to 2004
Year
Annual mean temperature
Difference from the station mean
1956
9.3 C
-0.86 C
1957
9.9 C
-0.34 C
1958
11.7 C
+1.53 C
1959
10.2 C
-0.03 C
1960
10.1 C
-0.06 C
1961
10.6 C
+0.42 C
1962
10.3 C
+0.13 C
1963
10.5 C
+0.35 C
1964
9.1 C
-1.11 C
1965
9.8 C
-0.36 C
1966
10.1 C
-0.06 C
1967
10.5 C
+0.35 C
1968
10.0 C
-0.15 C
1969
9.7 C
-0.51 C
1970
9.5 C
-0.67 C
1971
9.4 C
-0.84 C
1972
9.4 C
-0.80 C
1973
10.2 C
+0.02 C
1974
10.3 C
+0.12 C
1975
9.8 C
-0.42 C
1976
10.2 C
-0.04 C
1977
10.1 C
-0.11 C
1978
10.4 C
+0.24 C
1979
10.2 C
-0.03 C
1980
10.0 C
-0.23 C
1981
10.5 C
+0.26 C
1982
9.7 C
-0.45 C
1983
10.6 C
+0.38 C
1984
10.0 C
-0.16 C
1985
9.0 C
-1.24 C
1986
10.6 C
+0.45 C
1987
10.9 C
+0.66 C
1988
10.0 C
-0.16 C
1989
9.9 C
-0.33 C
1990
10.1 C
-0.11 C
1991
10.3 C
+0.06 C
1993
10.2 C
-0.01 C
1994
10.9 C
+0.66 C
1995
11.3 C
+1.12 C
1996
10.3 C
+0.07 C
1997
11.3 C
+1.12 C
1999
10.5 C
+0.26 C
2004
11.3 C
+1.08 C
The annual mean temperature here has risen by 0.14 C (0.01 to 0.28) per decade over 1956 to 2004. In Fahrenheit: 0.26 F (0.02 to 0.50) per decade. The slope is a straight line fitted to 43 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Mt Vernon 3 WNW
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.14 C (0.01 to 0.28) per decade
0.26 F (0.02 to 0.50) per decade
1956 to 2004
43
Rise
Mean daily maximum
-0.03 C (-0.19 to 0.13) per decade
-0.1 F (-0.3 to 0.2) per decade
1956 to 2004
43
Not clearly different from zero
Mean daily minimum
0.3 C (0.2 to 0.4) per decade
0.6 F (0.4 to 0.8) per decade
1956 to 2004
43
Rise
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
1956 to 2005
Yearly extremes at Mt Vernon 3 WNW: 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)
1960
31.1 C (88.0 F)
50
Coldest night (TNn)
-20.0 C (-4.0 F)
1957
-10.0 C (14.0 F)
50
Wettest day (Rx1day)
76.5 mm (3.0 in)
1990
37.2 mm (1.5 in)
50
Wettest five days (Rx5day)
151.6 mm (6.0 in)
2004
73.5 mm (2.9 in)
50
Longest dry spell (CDD)
52 days
1986
26 days
50
Hottest day (TXx)
The hottest day of the year at Mt Vernon 3 WNW, 1956 to 2005. The record is 36.7 C (98.1 F) in 1960, marked on the chart; the median year is 31.1 C (88.0 F).
Hottest day (TXx) at Mt Vernon 3 WNW by year
Year
Hottest day (TXx)
1956
31.1 C (88.0 F)
1957
28.3 C (82.9 F)
1958
33.9 C (93.0 F)
1959
32.2 C (90.0 F)
1960
36.7 C (98.1 F)
1961
32.8 C (91.0 F)
1962
29.4 C (84.9 F)
1963
31.7 C (89.1 F)
1964
28.3 C (82.9 F)
1965
32.2 C (90.0 F)
1966
30.0 C (86.0 F)
1967
33.9 C (93.0 F)
1968
31.1 C (88.0 F)
1969
31.7 C (89.1 F)
1970
33.3 C (91.9 F)
1971
32.2 C (90.0 F)
1972
31.1 C (88.0 F)
1973
31.1 C (88.0 F)
1974
31.1 C (88.0 F)
1975
29.4 C (84.9 F)
1976
30.0 C (86.0 F)
1977
33.9 C (93.0 F)
1978
33.9 C (93.0 F)
1979
32.2 C (90.0 F)
1980
29.4 C (84.9 F)
1981
31.7 C (89.1 F)
1982
30.6 C (87.1 F)
1983
31.1 C (88.0 F)
1984
30.0 C (86.0 F)
1985
31.7 C (89.1 F)
1986
31.1 C (88.0 F)
1987
30.0 C (86.0 F)
1988
32.8 C (91.0 F)
1989
30.0 C (86.0 F)
1990
30.6 C (87.1 F)
1991
31.1 C (88.0 F)
1992
30.0 C (86.0 F)
1993
31.1 C (88.0 F)
1994
34.4 C (93.9 F)
1995
32.2 C (90.0 F)
1996
32.8 C (91.0 F)
1997
30.6 C (87.1 F)
1998
28.9 C (84.0 F)
1999
28.9 C (84.0 F)
2000
30.0 C (86.0 F)
2001
30.6 C (87.1 F)
2002
31.1 C (88.0 F)
2003
30.6 C (87.1 F)
2004
31.7 C (89.1 F)
2005
16.7 C (62.1 F)
Coldest night (TNn)
The coldest night of the year at Mt Vernon 3 WNW, 1956 to 2005. The record is -20.0 C (-4.0 F) in 1957, marked on the chart; the median year is -10.0 C (14.0 F).
Coldest night (TNn) at Mt Vernon 3 WNW by year
Year
Coldest night (TNn)
1956
-13.3 C (8.1 F)
1957
-20.0 C (-4.0 F)
1958
-6.1 C (21.0 F)
1959
-11.7 C (10.9 F)
1960
-6.7 C (19.9 F)
1961
-6.7 C (19.9 F)
1962
-11.7 C (10.9 F)
1963
-12.2 C (10.0 F)
1964
-16.1 C (3.0 F)
1965
-5.6 C (21.9 F)
1966
-4.4 C (24.1 F)
1967
-6.7 C (19.9 F)
1968
-18.3 C (-0.9 F)
1969
-15.6 C (3.9 F)
1970
-6.1 C (21.0 F)
1971
-15.0 C (5.0 F)
1972
-16.7 C (1.9 F)
1973
-13.3 C (8.1 F)
1974
-10.0 C (14.0 F)
1975
-7.8 C (18.0 F)
1976
-6.7 C (19.9 F)
1977
-7.8 C (18.0 F)
1978
-12.8 C (9.0 F)
1979
-12.2 C (10.0 F)
1980
-13.9 C (7.0 F)
1981
-6.1 C (21.0 F)
1982
-17.2 C (1.0 F)
1983
-14.4 C (6.1 F)
1984
-12.2 C (10.0 F)
1985
-13.9 C (7.0 F)
1986
-8.3 C (17.1 F)
1987
-5.0 C (23.0 F)
1988
-6.7 C (19.9 F)
1989
-12.8 C (9.0 F)
1990
-13.9 C (7.0 F)
1991
-7.2 C (19.0 F)
1992
-11.1 C (12.0 F)
1993
-16.1 C (3.0 F)
1994
-6.7 C (19.9 F)
1995
-6.7 C (19.9 F)
1996
-10.0 C (14.0 F)
1997
-6.7 C (19.9 F)
1998
-10.6 C (12.9 F)
1999
-2.8 C (27.0 F)
2000
-6.7 C (19.9 F)
2001
-4.4 C (24.1 F)
2002
-6.7 C (19.9 F)
2003
-5.6 C (21.9 F)
2004
-12.8 C (9.0 F)
2005
-8.3 C (17.1 F)
Wettest day (Rx1day)
The wettest day of the year at Mt Vernon 3 WNW, 1956 to 2005. The record is 76.5 mm (3.0 in) in 1990, marked on the chart; the median year is 37.2 mm (1.5 in).
Wettest day (Rx1day) at Mt Vernon 3 WNW by year
Year
Wettest day (Rx1day)
1956
47.2 mm (1.9 in)
1957
26.4 mm (1.0 in)
1958
27.4 mm (1.1 in)
1959
37.3 mm (1.5 in)
1960
19.6 mm (0.8 in)
1961
36.8 mm (1.4 in)
1962
61.5 mm (2.4 in)
1963
28.2 mm (1.1 in)
1964
46.0 mm (1.8 in)
1965
38.1 mm (1.5 in)
1966
28.7 mm (1.1 in)
1967
52.1 mm (2.1 in)
1968
33.3 mm (1.3 in)
1969
25.7 mm (1.0 in)
1970
26.2 mm (1.0 in)
1971
44.2 mm (1.7 in)
1972
37.1 mm (1.5 in)
1973
19.3 mm (0.8 in)
1974
43.2 mm (1.7 in)
1975
36.6 mm (1.4 in)
1976
28.2 mm (1.1 in)
1977
49.5 mm (1.9 in)
1978
38.9 mm (1.5 in)
1979
46.0 mm (1.8 in)
1980
29.2 mm (1.1 in)
1981
24.6 mm (1.0 in)
1982
52.3 mm (2.1 in)
1983
61.7 mm (2.4 in)
1984
51.1 mm (2.0 in)
1985
62.0 mm (2.4 in)
1986
58.4 mm (2.3 in)
1987
20.8 mm (0.8 in)
1988
47.2 mm (1.9 in)
1989
43.9 mm (1.7 in)
1990
76.5 mm (3.0 in)
1991
23.6 mm (0.9 in)
1992
36.3 mm (1.4 in)
1993
27.4 mm (1.1 in)
1994
26.9 mm (1.1 in)
1995
60.2 mm (2.4 in)
1996
52.3 mm (2.1 in)
1997
37.1 mm (1.5 in)
1998
38.4 mm (1.5 in)
1999
28.4 mm (1.1 in)
2000
44.7 mm (1.8 in)
2001
28.7 mm (1.1 in)
2002
16.5 mm (0.6 in)
2003
41.1 mm (1.6 in)
2004
70.1 mm (2.8 in)
2005
20.6 mm (0.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Mt Vernon 3 WNW, 1956 to 2005. The record is 151.6 mm (6.0 in) in 2004, marked on the chart; the median year is 73.5 mm (2.9 in).
Wettest five days (Rx5day) at Mt Vernon 3 WNW by year
Year
Wettest five days (Rx5day)
1956
86.8 mm (3.4 in)
1957
49.5 mm (1.9 in)
1958
74.9 mm (2.9 in)
1959
89.6 mm (3.5 in)
1960
54.2 mm (2.1 in)
1961
67.5 mm (2.7 in)
1962
95.5 mm (3.8 in)
1963
50.8 mm (2.0 in)
1964
60.0 mm (2.4 in)
1965
91.0 mm (3.6 in)
1966
71.4 mm (2.8 in)
1967
114.4 mm (4.5 in)
1968
71.4 mm (2.8 in)
1969
41.7 mm (1.6 in)
1970
50.0 mm (2.0 in)
1971
111.1 mm (4.4 in)
1972
79.1 mm (3.1 in)
1973
58.4 mm (2.3 in)
1974
111.2 mm (4.4 in)
1975
83.8 mm (3.3 in)
1976
49.5 mm (1.9 in)
1977
73.6 mm (2.9 in)
1978
74.2 mm (2.9 in)
1979
111.1 mm (4.4 in)
1980
40.5 mm (1.6 in)
1981
54.9 mm (2.2 in)
1982
80.5 mm (3.2 in)
1983
83.5 mm (3.3 in)
1984
90.8 mm (3.6 in)
1985
103.6 mm (4.1 in)
1986
90.9 mm (3.6 in)
1987
37.2 mm (1.5 in)
1988
81.5 mm (3.2 in)
1989
104.1 mm (4.1 in)
1990
141.1 mm (5.6 in)
1991
65.5 mm (2.6 in)
1992
45.3 mm (1.8 in)
1993
47.9 mm (1.9 in)
1994
60.2 mm (2.4 in)
1995
103.6 mm (4.1 in)
1996
71.1 mm (2.8 in)
1997
82.3 mm (3.2 in)
1998
68.4 mm (2.7 in)
1999
82.3 mm (3.2 in)
2000
61.5 mm (2.4 in)
2001
59.7 mm (2.4 in)
2002
41.1 mm (1.6 in)
2003
73.4 mm (2.9 in)
2004
151.6 mm (6.0 in)
2005
45.3 mm (1.8 in)
Longest dry spell (CDD)
The longest dry spell of the year at Mt Vernon 3 WNW, 1956 to 2005. The record is 52 days in 1986, marked on the chart; the median year is 26 days.
Longest dry spell (CDD) at Mt Vernon 3 WNW by year
Year
Longest dry spell (CDD)
1956
26 days
1957
20 days
1958
36 days
1959
17 days
1960
43 days
1961
23 days
1962
20 days
1963
19 days
1964
10 days
1965
37 days
1966
19 days
1967
30 days
1968
24 days
1969
26 days
1970
32 days
1971
40 days
1972
33 days
1973
19 days
1974
30 days
1975
16 days
1976
17 days
1977
29 days
1978
15 days
1979
37 days
1980
16 days
1981
21 days
1982
20 days
1983
16 days
1984
36 days
1985
46 days
1986
52 days
1987
35 days
1988
31 days
1989
33 days
1990
43 days
1991
32 days
1992
17 days
1993
24 days
1994
37 days
1995
27 days
1996
24 days
1997
46 days
1998
37 days
1999
18 days
2000
17 days
2001
20 days
2002
26 days
2003
20 days
2004
29 days
2005
9 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
43 years with a frost
Across 43 years with a frost, the median last spring frost at Mt Vernon 3 WNW falls on 14 April and the median first autumn frost on 16 October, which leaves a median of 184 days between them.
Fitted over all years, the growing season changes by +9.2 days per decade at this station.
Frost dates and growing season at Mt Vernon 3 WNW
Measure
Median, all years
Earliest period
Recent period (1969 to 2004)
Recent against earliest
Fitted trend
Last spring frost
14 April
n/a
13 April
n/a
-4.9 days per decade
First autumn frost
16 October
n/a
16 October
n/a
+4.3 days per decade
Growing days
184 days
n/a
195 days
n/a
+9.2 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
46 years, 1956 to 2004
A day with at least 37.7 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 84.6 mm (3.3 in) of rain is expected about once in 100 years.
Rainfall return levels at Mt Vernon 3 WNW: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
37.7 mm (1.5 in)
5 years
50.7 mm (2.0 in)
10 years
59.2 mm (2.3 in)
25 years
69.6 mm (2.7 in)
50 years
77.2 mm (3.0 in)
Longer than the 46 years of record
100 years
84.6 mm (3.3 in)
Longer than the 46 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, 46 years of values from 1956 to 2004.
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: 76.5 mm (3.0 in) in 1990; 70.1 mm (2.8 in) in 2004; 62.0 mm (2.4 in) in 1985.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Mt Vernon 3 WNW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Mt Vernon 3 WNW 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.