Record envelope, standing records and threshold days for Parkton 2 SW (USC00186844), Maryland, United States, with 88 years of record.
Key Facts for Parkton 2 SW
Parkton 2 SW (USC00186844) is a weather station in Maryland, United States at 39.63 latitude and -76.70 longitude, 183 m (600 ft) above sea level.
The station reports from 1899 to 1986, 88 years of record.
1,464 records set at Parkton 2 SW still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Parkton 2 SW set a daily record precipitation of 52.6 mm (2.1 in) on 24 December 1986.
About the Station
Location: Maryland, United States, 39.63 latitude, -76.70 longitude.
Elevation: 183 m (600 ft).
Period of record: 1899 to 1986, 88 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 Parkton 2 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 Parkton 2 SW, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
23.9 C (75.0 F)
-24.4 C (-11.9 F)
n/a
n/a
Feb
25.0 C (77.0 F)
-22.2 C (-8.0 F)
n/a
n/a
Mar
30.0 C (86.0 F)
-15.6 C (3.9 F)
n/a
n/a
Apr
33.3 C (91.9 F)
-9.4 C (15.1 F)
n/a
n/a
May
33.3 C (91.9 F)
-3.9 C (25.0 F)
n/a
n/a
Jun
36.7 C (98.1 F)
0.6 C (33.1 F)
n/a
n/a
Jul
39.4 C (102.9 F)
7.2 C (45.0 F)
n/a
n/a
Aug
37.8 C (100.0 F)
3.3 C (37.9 F)
n/a
n/a
Sep
36.7 C (98.1 F)
-0.6 C (30.9 F)
n/a
n/a
Oct
34.4 C (93.9 F)
-6.7 C (19.9 F)
n/a
n/a
Nov
29.4 C (84.9 F)
-13.9 C (7.0 F)
n/a
n/a
Dec
24.4 C (75.9 F)
-20.0 C (-4.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Parkton 2 SW still stand. 1933 holds the most, with 43.
Standing records at Parkton 2 SW by the year they were set
Year set
Standing records
1899
21
1931
38
1932
34
1933
43
1934
22
1935
20
1936
40
1937
28
1938
27
1939
28
1940
38
1941
34
1942
27
1943
28
1944
18
1945
34
1946
22
1947
31
1948
24
1949
24
1950
26
1953
30
1954
32
1955
28
1956
37
1957
31
1958
27
1959
22
1960
32
1961
21
1962
30
1963
28
1964
31
1965
22
1966
27
1967
26
1968
18
1969
10
1970
21
1971
19
1972
34
1973
20
1974
17
1975
16
1976
40
1977
26
1978
17
1979
39
1980
17
1981
13
1982
32
1983
22
1984
25
1985
15
1986
32
All-Time Record Progression
6 new records
6 all-time records were set at Parkton 2 SW between 22 June 1972 and 11 February 1983. Each dot is a new record.
When Parkton 2 SW set new all-time records
Date
Kind
Detail
1972-06-22
Record daily precipitation
Record daily precipitation 223.8 mm (8.8 in)
1977-01-17
Record low minimum temperature
Record low minimum temperature -23.3 C (-9.9 F)
1982-01-10
Record low maximum temperature
Record low maximum temperature -13.3 C (8.1 F)
1982-01-17
Record low maximum temperature
Record low maximum temperature -14.4 C (6.1 F)
1982-01-17
Record low minimum temperature
Record low minimum temperature -24.4 C (-11.9 F)
1983-02-11
Record daily snowfall
Record daily snowfall 61.7 cm (24.3 in)
Wettest Day of Each Month
Jun: 223.8 mm (8.8 in)
The wettest day on record for each calendar month at Parkton 2 SW. The most was 223.8 mm (8.8 in) on 22 June 1972.
Record daily precipitation for each month at Parkton 2 SW
Month
Record daily precipitation (mm)
Date
Jan
57.9 mm (2.3 in)
3 January 1936
Feb
52.1 mm (2.1 in)
22 February 1937
Mar
74.2 mm (2.9 in)
12 March 1936
Apr
75.7 mm (3.0 in)
15 April 1983
May
85.9 mm (3.4 in)
8 May 1960
Jun
223.8 mm (8.8 in)
22 June 1972
Jul
124.5 mm (4.9 in)
12 July 1949
Aug
126.5 mm (5.0 in)
27 August 1971
Sep
147.8 mm (5.8 in)
17 September 1934
Oct
99.1 mm (3.9 in)
26 October 1943
Nov
97.5 mm (3.8 in)
13 November 1937
Dec
81.3 mm (3.2 in)
30 December 1942
Period of Record Coverage
1899 to 1986
Complete yearUnder 90 percent of days
55 years of record at Parkton 2 SW, 1899 to 1986. 4 years have data for under 90 percent of days and are left out of rankings: 1899, 1931, 1934, 1984.
Cooler than the station meanWarmer than the station mean
One stripe for each of 49 complete years at Parkton 2 SW, 1932 to 1986. Blue stripes are years cooler than the station's own mean of 11.1 C (52.1 F); red stripes are warmer. The coolest year was 1958, at 10.0 C (50.1 F), and the warmest was 1949, at 13.0 C (55.3 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Parkton 2 SW as warming stripes, 1932 to 1986
Year
Annual mean temperature
Difference from the station mean
1932
12.2 C
+1.02 C
1933
12.0 C
+0.89 C
1935
11.1 C
-0.02 C
1936
11.4 C
+0.28 C
1937
11.6 C
+0.46 C
1938
12.2 C
+1.08 C
1939
12.1 C
+0.93 C
1940
10.3 C
-0.89 C
1941
12.0 C
+0.81 C
1942
11.6 C
+0.47 C
1943
11.6 C
+0.40 C
1944
11.6 C
+0.44 C
1945
11.5 C
+0.35 C
1946
12.2 C
+1.05 C
1947
11.5 C
+0.30 C
1948
11.4 C
+0.26 C
1949
13.0 C
+1.82 C
1950
11.9 C
+0.71 C
1954
11.5 C
+0.35 C
1955
10.9 C
-0.25 C
1956
10.9 C
-0.23 C
1957
11.3 C
+0.11 C
1958
10.0 C
-1.11 C
1959
11.7 C
+0.56 C
1960
10.7 C
-0.50 C
1962
10.3 C
-0.82 C
1963
10.3 C
-0.87 C
1964
11.0 C
-0.14 C
1965
10.8 C
-0.39 C
1966
10.7 C
-0.44 C
1967
10.3 C
-0.84 C
1968
10.7 C
-0.45 C
1969
10.5 C
-0.64 C
1970
10.9 C
-0.27 C
1971
11.1 C
-0.05 C
1972
10.4 C
-0.71 C
1973
11.7 C
+0.58 C
1974
11.1 C
-0.06 C
1975
11.4 C
+0.20 C
1976
10.4 C
-0.72 C
1977
10.9 C
-0.21 C
1978
10.1 C
-1.09 C
1979
10.5 C
-0.67 C
1980
10.6 C
-0.54 C
1981
10.4 C
-0.73 C
1982
10.5 C
-0.61 C
1983
11.2 C
+0.02 C
1985
11.1 C
-0.01 C
1986
11.2 C
+0.06 C
The annual mean temperature here has fallen by 0.2 C (0.1 to 0.3) per decade over 1932 to 1986. In Fahrenheit: 0.4 F (0.3 to 0.6) per decade. The slope is a straight line fitted to 49 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Parkton 2 SW
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.2 C (-0.3 to -0.1) per decade
-0.4 F (-0.6 to -0.3) per decade
1932 to 1986
49
Fall
Mean daily maximum
-0.11 C (-0.21 to 0.00) per decade
-0.19 F (-0.39 to 0.01) per decade
1932 to 1986
49
Not clearly different from zero
Mean daily minimum
-0.4 C (-0.5 to -0.3) per decade
-0.7 F (-0.9 to -0.5) per decade
1932 to 1986
49
Fall
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
1899 to 1986
Yearly extremes at Parkton 2 SW: 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)
1936
34.4 C (93.9 F)
55
Coldest night (TNn)
-24.4 C (-11.9 F)
1982
-17.8 C (0.0 F)
55
Wettest day (Rx1day)
223.8 mm (8.8 in)
1972
69.6 mm (2.7 in)
55
Wettest five days (Rx5day)
310.4 mm (12.2 in)
1972
98.3 mm (3.9 in)
55
Longest dry spell (CDD)
28 days
1931
18 days
55
Hottest day (TXx)
The hottest day of the year at Parkton 2 SW, 1899 to 1986. The record is 39.4 C (102.9 F) in 1936, marked on the chart; the median year is 34.4 C (93.9 F).
Hottest day (TXx) at Parkton 2 SW by year
Year
Hottest day (TXx)
1899
35.0 C (95.0 F)
1931
36.7 C (98.1 F)
1932
36.1 C (97.0 F)
1933
35.6 C (96.1 F)
1934
37.2 C (99.0 F)
1935
33.9 C (93.0 F)
1936
39.4 C (102.9 F)
1937
35.6 C (96.1 F)
1938
35.0 C (95.0 F)
1939
34.4 C (93.9 F)
1940
35.6 C (96.1 F)
1941
35.6 C (96.1 F)
1942
33.3 C (91.9 F)
1943
34.4 C (93.9 F)
1944
35.0 C (95.0 F)
1945
35.0 C (95.0 F)
1946
34.4 C (93.9 F)
1947
34.4 C (93.9 F)
1948
36.1 C (97.0 F)
1949
36.1 C (97.0 F)
1950
31.7 C (89.1 F)
1953
37.2 C (99.0 F)
1954
37.8 C (100.0 F)
1955
37.8 C (100.0 F)
1956
34.4 C (93.9 F)
1957
36.1 C (97.0 F)
1958
32.2 C (90.0 F)
1959
35.6 C (96.1 F)
1960
32.8 C (91.0 F)
1961
32.2 C (90.0 F)
1962
34.4 C (93.9 F)
1963
34.4 C (93.9 F)
1964
35.0 C (95.0 F)
1965
33.3 C (91.9 F)
1966
38.3 C (100.9 F)
1967
32.8 C (91.0 F)
1968
34.4 C (93.9 F)
1969
35.0 C (95.0 F)
1970
33.9 C (93.0 F)
1971
32.8 C (91.0 F)
1972
33.3 C (91.9 F)
1973
35.6 C (96.1 F)
1974
32.8 C (91.0 F)
1975
34.4 C (93.9 F)
1976
33.3 C (91.9 F)
1977
34.4 C (93.9 F)
1978
34.4 C (93.9 F)
1979
32.2 C (90.0 F)
1980
36.1 C (97.0 F)
1981
33.3 C (91.9 F)
1982
33.9 C (93.0 F)
1983
37.8 C (100.0 F)
1984
33.9 C (93.0 F)
1985
34.4 C (93.9 F)
1986
36.1 C (97.0 F)
Coldest night (TNn)
The coldest night of the year at Parkton 2 SW, 1899 to 1986. The record is -24.4 C (-11.9 F) in 1982, marked on the chart; the median year is -17.8 C (0.0 F).
Coldest night (TNn) at Parkton 2 SW by year
Year
Coldest night (TNn)
1899
16.1 C (61.0 F)
1931
-7.8 C (18.0 F)
1932
-13.3 C (8.1 F)
1933
-18.3 C (-0.9 F)
1934
-12.2 C (10.0 F)
1935
-20.0 C (-4.0 F)
1936
-21.7 C (-7.1 F)
1937
-11.1 C (12.0 F)
1938
-13.3 C (8.1 F)
1939
-14.4 C (6.1 F)
1940
-18.3 C (-0.9 F)
1941
-11.1 C (12.0 F)
1942
-18.9 C (-2.0 F)
1943
-17.8 C (0.0 F)
1944
-13.9 C (7.0 F)
1945
-16.7 C (1.9 F)
1946
-14.4 C (6.1 F)
1947
-17.8 C (0.0 F)
1948
-18.3 C (-0.9 F)
1949
-12.2 C (10.0 F)
1950
-13.9 C (7.0 F)
1953
-12.2 C (10.0 F)
1954
-18.3 C (-0.9 F)
1955
-18.3 C (-0.9 F)
1956
-11.1 C (12.0 F)
1957
-21.1 C (-6.0 F)
1958
-17.8 C (0.0 F)
1959
-17.8 C (0.0 F)
1960
-18.9 C (-2.0 F)
1961
-22.2 C (-8.0 F)
1962
-18.3 C (-0.9 F)
1963
-20.6 C (-5.1 F)
1964
-15.6 C (3.9 F)
1965
-18.9 C (-2.0 F)
1966
-18.9 C (-2.0 F)
1967
-16.7 C (1.9 F)
1968
-18.9 C (-2.0 F)
1969
-14.4 C (6.1 F)
1970
-21.1 C (-6.0 F)
1971
-17.8 C (0.0 F)
1972
-18.3 C (-0.9 F)
1973
-15.6 C (3.9 F)
1974
-15.0 C (5.0 F)
1975
-14.4 C (6.1 F)
1976
-17.2 C (1.0 F)
1977
-23.3 C (-9.9 F)
1978
-16.1 C (3.0 F)
1979
-21.7 C (-7.1 F)
1980
-18.3 C (-0.9 F)
1981
-20.0 C (-4.0 F)
1982
-24.4 C (-11.9 F)
1983
-20.0 C (-4.0 F)
1984
-22.8 C (-9.0 F)
1985
-24.4 C (-11.9 F)
1986
-17.2 C (1.0 F)
Wettest day (Rx1day)
The wettest day of the year at Parkton 2 SW, 1899 to 1986. The record is 223.8 mm (8.8 in) in 1972, marked on the chart; the median year is 69.6 mm (2.7 in).
Wettest day (Rx1day) at Parkton 2 SW by year
Year
Wettest day (Rx1day)
1899
8.4 mm (0.33 in)
1931
75.4 mm (3.0 in)
1932
75.2 mm (3.0 in)
1933
114.3 mm (4.5 in)
1934
147.8 mm (5.8 in)
1935
93.2 mm (3.7 in)
1936
74.2 mm (2.9 in)
1937
97.5 mm (3.8 in)
1938
69.9 mm (2.8 in)
1939
55.9 mm (2.2 in)
1940
121.7 mm (4.8 in)
1941
45.7 mm (1.8 in)
1942
106.7 mm (4.2 in)
1943
99.1 mm (3.9 in)
1944
63.5 mm (2.5 in)
1945
80.0 mm (3.1 in)
1946
125.5 mm (4.9 in)
1947
58.4 mm (2.3 in)
1948
43.2 mm (1.7 in)
1949
124.5 mm (4.9 in)
1950
69.1 mm (2.7 in)
1953
73.2 mm (2.9 in)
1954
43.9 mm (1.7 in)
1955
100.6 mm (4.0 in)
1956
54.4 mm (2.1 in)
1957
60.5 mm (2.4 in)
1958
48.0 mm (1.9 in)
1959
45.5 mm (1.8 in)
1960
85.9 mm (3.4 in)
1961
32.0 mm (1.3 in)
1962
60.7 mm (2.4 in)
1963
56.4 mm (2.2 in)
1964
43.4 mm (1.7 in)
1965
69.6 mm (2.7 in)
1966
86.4 mm (3.4 in)
1967
62.2 mm (2.4 in)
1968
118.1 mm (4.6 in)
1969
62.7 mm (2.5 in)
1970
59.7 mm (2.4 in)
1971
126.5 mm (5.0 in)
1972
223.8 mm (8.8 in)
1973
71.9 mm (2.8 in)
1974
45.5 mm (1.8 in)
1975
80.5 mm (3.2 in)
1976
63.0 mm (2.5 in)
1977
66.5 mm (2.6 in)
1978
57.9 mm (2.3 in)
1979
86.6 mm (3.4 in)
1980
47.2 mm (1.9 in)
1981
49.5 mm (1.9 in)
1982
46.2 mm (1.8 in)
1983
75.7 mm (3.0 in)
1984
78.5 mm (3.1 in)
1985
101.1 mm (4.0 in)
1986
52.6 mm (2.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Parkton 2 SW, 1899 to 1986. The record is 310.4 mm (12.2 in) in 1972, marked on the chart; the median year is 98.3 mm (3.9 in).
Wettest five days (Rx5day) at Parkton 2 SW by year
Year
Wettest five days (Rx5day)
1899
10.9 mm (0.4 in)
1931
97.8 mm (3.9 in)
1932
87.6 mm (3.4 in)
1933
257.3 mm (10.1 in)
1934
169.2 mm (6.7 in)
1935
179.1 mm (7.1 in)
1936
83.1 mm (3.3 in)
1937
148.1 mm (5.8 in)
1938
97.9 mm (3.9 in)
1939
96.5 mm (3.8 in)
1940
128.1 mm (5.0 in)
1941
49.8 mm (2.0 in)
1942
179.3 mm (7.1 in)
1943
144.8 mm (5.7 in)
1944
87.4 mm (3.4 in)
1945
202.0 mm (8.0 in)
1946
131.4 mm (5.2 in)
1947
71.1 mm (2.8 in)
1948
69.3 mm (2.7 in)
1949
127.0 mm (5.0 in)
1950
80.3 mm (3.2 in)
1953
129.8 mm (5.1 in)
1954
57.3 mm (2.3 in)
1955
219.2 mm (8.6 in)
1956
112.0 mm (4.4 in)
1957
82.0 mm (3.2 in)
1958
94.5 mm (3.7 in)
1959
78.3 mm (3.1 in)
1960
119.4 mm (4.7 in)
1961
68.8 mm (2.7 in)
1962
98.3 mm (3.9 in)
1963
103.1 mm (4.1 in)
1964
69.3 mm (2.7 in)
1965
75.0 mm (3.0 in)
1966
104.1 mm (4.1 in)
1967
104.9 mm (4.1 in)
1968
140.7 mm (5.5 in)
1969
112.5 mm (4.4 in)
1970
73.4 mm (2.9 in)
1971
154.6 mm (6.1 in)
1972
310.4 mm (12.2 in)
1973
82.0 mm (3.2 in)
1974
68.1 mm (2.7 in)
1975
242.6 mm (9.6 in)
1976
74.7 mm (2.9 in)
1977
103.9 mm (4.1 in)
1978
79.3 mm (3.1 in)
1979
157.2 mm (6.2 in)
1980
67.5 mm (2.7 in)
1981
107.2 mm (4.2 in)
1982
88.2 mm (3.5 in)
1983
83.6 mm (3.3 in)
1984
103.9 mm (4.1 in)
1985
113.3 mm (4.5 in)
1986
75.9 mm (3.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Parkton 2 SW, 1899 to 1986. The record is 28 days in 1931, marked on the chart; the median year is 18 days.
Longest dry spell (CDD) at Parkton 2 SW by year
Year
Longest dry spell (CDD)
1899
10 days
1931
28 days
1932
20 days
1933
21 days
1934
18 days
1935
14 days
1936
14 days
1937
15 days
1938
14 days
1939
24 days
1940
18 days
1941
19 days
1942
19 days
1943
21 days
1944
19 days
1945
16 days
1946
17 days
1947
20 days
1948
18 days
1949
20 days
1950
26 days
1953
18 days
1954
18 days
1955
22 days
1956
15 days
1957
17 days
1958
23 days
1959
18 days
1960
20 days
1961
14 days
1962
19 days
1963
27 days
1964
27 days
1965
16 days
1966
20 days
1967
23 days
1968
25 days
1969
17 days
1970
15 days
1971
14 days
1972
21 days
1973
26 days
1974
19 days
1975
14 days
1976
27 days
1977
25 days
1978
21 days
1979
12 days
1980
14 days
1981
15 days
1982
17 days
1983
17 days
1984
13 days
1985
13 days
1986
19 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
49 years with a frost
Across 49 years with a frost, the median last spring frost at Parkton 2 SW falls on 23 April and the median first autumn frost on 16 October, which leaves a median of 177 days between them.
Fitted over all years, the growing season changes by -3.4 days per decade at this station.
Frost dates and growing season at Parkton 2 SW
Measure
Median, all years
Earliest period
Recent period (1955 to 1986)
Recent against earliest
Fitted trend
Last spring frost
23 April
n/a
26 April
n/a
+2.2 days per decade
First autumn frost
16 October
n/a
14 October
n/a
-1.2 days per decade
Growing days
177 days
n/a
172 days
n/a
-3.4 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
51 years, 1932 to 1986
A day with at least 68.2 mm (2.7 in) of rain is expected about once in 2 years. A day with at least 197.7 mm (7.8 in) of rain is expected about once in 100 years.
Rainfall return levels at Parkton 2 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
68.2 mm (2.7 in)
5 years
94.9 mm (3.7 in)
10 years
115.3 mm (4.5 in)
25 years
145.0 mm (5.7 in)
50 years
170.0 mm (6.7 in)
100 years
197.7 mm (7.8 in)
Longer than the 51 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, 51 years of values from 1932 to 1986.
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: 223.8 mm (8.8 in) in 1972; 126.5 mm (5.0 in) in 1971; 125.5 mm (4.9 in) in 1946.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Parkton 2 SW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Parkton 2 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.