Record envelope, standing records and threshold days for Morris Plains 1 W (USC00285769), New Jersey, United States, with 50 years of record.
Key Facts for Morris Plains 1 W
Morris Plains 1 W (USC00285769) is a weather station in New Jersey, United States at 40.83 latitude and -74.50 longitude, 122 m (400 ft) above sea level.
The station reports from 1941 to 1990, 50 years of record.
1,464 records set at Morris Plains 1 W still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Morris Plains 1 W set a daily record low maximum temperature of 16.1 C (61.0 F) on 13 July 1990.
About the Station
Location: New Jersey, United States, 40.83 latitude, -74.50 longitude.
Elevation: 122 m (400 ft).
Period of record: 1941 to 1990, 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 Morris Plains 1 W. 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 Morris Plains 1 W, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
22.2 C (72.0 F)
-26.7 C (-16.1 F)
n/a
n/a
Feb
25.0 C (77.0 F)
-23.3 C (-9.9 F)
n/a
n/a
Mar
28.9 C (84.0 F)
-20.0 C (-4.0 F)
n/a
n/a
Apr
33.9 C (93.0 F)
-11.1 C (12.0 F)
n/a
n/a
May
36.7 C (98.1 F)
-3.3 C (26.1 F)
n/a
n/a
Jun
37.2 C (99.0 F)
0.0 C (32.0 F)
n/a
n/a
Jul
37.8 C (100.0 F)
3.9 C (39.0 F)
n/a
n/a
Aug
38.3 C (100.9 F)
2.2 C (36.0 F)
n/a
n/a
Sep
38.9 C (102.0 F)
-2.8 C (27.0 F)
n/a
n/a
Oct
31.1 C (88.0 F)
-8.3 C (17.1 F)
n/a
n/a
Nov
28.3 C (82.9 F)
-15.0 C (5.0 F)
n/a
n/a
Dec
23.3 C (73.9 F)
-22.2 C (-8.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Morris Plains 1 W still stand. 1949 holds the most, with 72.
Standing records at Morris Plains 1 W by the year they were set
Year set
Standing records
1945
5
1946
29
1947
34
1948
28
1949
72
1950
29
1951
34
1952
30
1953
43
1954
42
1955
41
1956
42
1957
45
1958
25
1959
51
1960
36
1961
40
1962
37
1963
40
1964
39
1965
30
1966
23
1967
37
1968
28
1969
16
1970
25
1971
22
1972
24
1973
15
1974
29
1975
27
1976
47
1977
29
1978
18
1979
48
1980
24
1981
25
1982
40
1983
24
1984
30
1985
23
1986
22
1987
26
1988
36
1989
27
1990
27
All-Time Record Progression
7 new records
7 all-time records were set at Morris Plains 1 W between 28 August 1971 and 12 February 1983. Each dot is a new record.
When Morris Plains 1 W set new all-time records
Date
Kind
Detail
1971-08-28
Record daily precipitation
Record daily precipitation 230.1 mm (9.1 in)
1976-01-19
Record low maximum temperature
Record low maximum temperature -14.4 C (6.1 F)
1978-02-07
Record snow depth
Record snow depth 58.4 cm (23.0 in)
1982-01-18
Record low maximum temperature
Record low maximum temperature -16.7 C (1.9 F)
1982-01-18
Record low minimum temperature
Record low minimum temperature -26.7 C (-16.1 F)
1983-02-12
Record daily snowfall
Record daily snowfall 61.0 cm (24.0 in)
1983-02-12
Record snow depth
Record snow depth 66.0 cm (26.0 in)
Wettest Day of Each Month
Aug: 230.1 mm (9.1 in)
The wettest day on record for each calendar month at Morris Plains 1 W. The most was 230.1 mm (9.1 in) on 28 August 1971.
Record daily precipitation for each month at Morris Plains 1 W
Month
Record daily precipitation (mm)
Date
Jan
105.9 mm (4.2 in)
25 January 1979
Feb
64.3 mm (2.5 in)
8 February 1965
Mar
95.3 mm (3.8 in)
23 March 1977
Apr
85.9 mm (3.4 in)
5 April 1984
May
116.8 mm (4.6 in)
29 May 1968
Jun
118.6 mm (4.7 in)
1 June 1952
Jul
109.2 mm (4.3 in)
28 July 1951
Aug
230.1 mm (9.1 in)
28 August 1971
Sep
97.3 mm (3.8 in)
22 September 1966
Oct
127.5 mm (5.0 in)
30 October 1973
Nov
107.4 mm (4.2 in)
9 November 1972
Dec
73.7 mm (2.9 in)
13 December 1983
Period of Record Coverage
1945 to 1990
Complete yearUnder 90 percent of days
46 years of record at Morris Plains 1 W, 1945 to 1990. 3 years have data for under 90 percent of days and are left out of rankings: 1945, 1952, 1990.
Cooler than the station meanWarmer than the station mean
One stripe for each of 42 complete years at Morris Plains 1 W, 1946 to 1989. 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 1967, at 8.9 C (48.1 F), and the warmest was 1949, at 12.3 C (54.1 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Morris Plains 1 W as warming stripes, 1946 to 1989
Year
Annual mean temperature
Difference from the station mean
1946
11.4 C
+1.18 C
1947
10.5 C
+0.27 C
1948
10.6 C
+0.36 C
1949
12.3 C
+2.10 C
1950
10.7 C
+0.52 C
1951
11.2 C
+0.99 C
1953
11.4 C
+1.18 C
1954
10.1 C
-0.13 C
1955
11.0 C
+0.78 C
1956
10.6 C
+0.39 C
1957
11.3 C
+1.13 C
1958
9.5 C
-0.71 C
1959
10.9 C
+0.74 C
1960
9.9 C
-0.35 C
1961
10.2 C
+0.03 C
1962
9.7 C
-0.52 C
1963
9.6 C
-0.62 C
1964
9.8 C
-0.40 C
1965
9.5 C
-0.70 C
1966
9.6 C
-0.65 C
1967
8.9 C
-1.26 C
1968
9.6 C
-0.57 C
1969
9.7 C
-0.47 C
1970
9.9 C
-0.27 C
1971
10.1 C
-0.08 C
1972
9.5 C
-0.68 C
1973
11.2 C
+0.95 C
1974
10.2 C
+0.03 C
1975
10.6 C
+0.42 C
1976
9.5 C
-0.70 C
1977
10.2 C
-0.02 C
1978
9.5 C
-0.75 C
1979
10.3 C
+0.09 C
1980
9.8 C
-0.40 C
1981
9.7 C
-0.51 C
1983
10.6 C
+0.43 C
1984
10.5 C
+0.31 C
1985
10.2 C
-0.05 C
1986
9.8 C
-0.40 C
1987
10.2 C
+0.04 C
1988
9.4 C
-0.76 C
1989
9.4 C
-0.85 C
The annual mean temperature here has fallen by 0.3 C (0.1 to 0.4) per decade over 1946 to 1989. In Fahrenheit: 0.5 F (0.2 to 0.8) per decade. The slope is a straight line fitted to 42 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Morris Plains 1 W
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.3 C (-0.4 to -0.1) per decade
-0.5 F (-0.8 to -0.2) per decade
1946 to 1989
42
Fall
Mean daily maximum
-0.22 C (-0.42 to -0.03) per decade
-0.40 F (-0.76 to -0.05) per decade
1946 to 1989
42
Fall
Mean daily minimum
-0.3 C (-0.5 to -0.2) per decade
-0.6 F (-0.9 to -0.3) per decade
1946 to 1989
42
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
1941 to 1990
Yearly extremes at Morris Plains 1 W: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
38.9 C (102.0 F)
1953
35.3 C (95.5 F)
46
Coldest night (TNn)
-26.7 C (-16.1 F)
1982
-20.0 C (-4.0 F)
46
Wettest day (Rx1day)
230.1 mm (9.1 in)
1971
75.6 mm (3.0 in)
50
Wettest five days (Rx5day)
246.9 mm (9.7 in)
1971
119.3 mm (4.7 in)
50
Longest dry spell (CDD)
37 days
1964
17 days
50
Hottest day (TXx)
The hottest day of the year at Morris Plains 1 W, 1941 to 1990. The record is 38.9 C (102.0 F) in 1953, marked on the chart; the median year is 35.3 C (95.5 F).
Hottest day (TXx) at Morris Plains 1 W by year
Year
Hottest day (TXx)
1941
n/a
1942
n/a
1943
n/a
1944
n/a
1945
26.7 C (80.1 F)
1946
34.4 C (93.9 F)
1947
34.4 C (93.9 F)
1948
38.3 C (100.9 F)
1949
37.8 C (100.0 F)
1950
32.8 C (91.0 F)
1951
32.8 C (91.0 F)
1952
37.2 C (99.0 F)
1953
38.9 C (102.0 F)
1954
37.8 C (100.0 F)
1955
37.8 C (100.0 F)
1956
35.6 C (96.1 F)
1957
37.2 C (99.0 F)
1958
33.3 C (91.9 F)
1959
35.0 C (95.0 F)
1960
32.2 C (90.0 F)
1961
35.6 C (96.1 F)
1962
36.7 C (98.1 F)
1963
36.1 C (97.0 F)
1964
35.6 C (96.1 F)
1965
33.9 C (93.0 F)
1966
37.8 C (100.0 F)
1967
35.0 C (95.0 F)
1968
35.6 C (96.1 F)
1969
35.0 C (95.0 F)
1970
34.4 C (93.9 F)
1971
34.4 C (93.9 F)
1972
34.4 C (93.9 F)
1973
35.6 C (96.1 F)
1974
34.4 C (93.9 F)
1975
36.1 C (97.0 F)
1976
33.9 C (93.0 F)
1977
36.1 C (97.0 F)
1978
35.6 C (96.1 F)
1979
33.3 C (91.9 F)
1980
36.7 C (98.1 F)
1981
34.4 C (93.9 F)
1982
31.1 C (88.0 F)
1983
36.7 C (98.1 F)
1984
37.2 C (99.0 F)
1985
33.3 C (91.9 F)
1986
35.6 C (96.1 F)
1987
35.0 C (95.0 F)
1988
37.8 C (100.0 F)
1989
33.9 C (93.0 F)
1990
33.9 C (93.0 F)
Coldest night (TNn)
The coldest night of the year at Morris Plains 1 W, 1941 to 1990. The record is -26.7 C (-16.1 F) in 1982, marked on the chart; the median year is -20.0 C (-4.0 F).
Coldest night (TNn) at Morris Plains 1 W by year
Year
Coldest night (TNn)
1941
n/a
1942
n/a
1943
n/a
1944
n/a
1945
-17.8 C (0.0 F)
1946
-18.3 C (-0.9 F)
1947
-16.7 C (1.9 F)
1948
-24.4 C (-11.9 F)
1949
-16.1 C (3.0 F)
1950
-22.2 C (-8.0 F)
1951
-17.2 C (1.0 F)
1952
-17.2 C (1.0 F)
1953
-14.4 C (6.1 F)
1954
-23.9 C (-11.0 F)
1955
-18.9 C (-2.0 F)
1956
-14.4 C (6.1 F)
1957
-22.2 C (-8.0 F)
1958
-18.9 C (-2.0 F)
1959
-16.1 C (3.0 F)
1960
-20.6 C (-5.1 F)
1961
-25.6 C (-14.1 F)
1962
-20.0 C (-4.0 F)
1963
-22.2 C (-8.0 F)
1964
-19.4 C (-2.9 F)
1965
-20.0 C (-4.0 F)
1966
-20.0 C (-4.0 F)
1967
-22.2 C (-8.0 F)
1968
-21.1 C (-6.0 F)
1969
-15.0 C (5.0 F)
1970
-21.7 C (-7.1 F)
1971
-19.4 C (-2.9 F)
1972
-18.3 C (-0.9 F)
1973
-16.7 C (1.9 F)
1974
-16.7 C (1.9 F)
1975
-15.6 C (3.9 F)
1976
-19.4 C (-2.9 F)
1977
-21.1 C (-6.0 F)
1978
-21.1 C (-6.0 F)
1979
-23.3 C (-9.9 F)
1980
-21.7 C (-7.1 F)
1981
-23.3 C (-9.9 F)
1982
-26.7 C (-16.1 F)
1983
-20.0 C (-4.0 F)
1984
-25.6 C (-14.1 F)
1985
-22.8 C (-9.0 F)
1986
-17.8 C (0.0 F)
1987
-20.6 C (-5.1 F)
1988
-21.7 C (-7.1 F)
1989
-18.3 C (-0.9 F)
1990
-16.7 C (1.9 F)
Wettest day (Rx1day)
The wettest day of the year at Morris Plains 1 W, 1941 to 1990. The record is 230.1 mm (9.1 in) in 1971, marked on the chart; the median year is 75.6 mm (3.0 in).
Wettest day (Rx1day) at Morris Plains 1 W by year
Year
Wettest day (Rx1day)
1941
52.8 mm (2.1 in)
1942
98.3 mm (3.9 in)
1943
56.4 mm (2.2 in)
1944
75.9 mm (3.0 in)
1945
50.8 mm (2.0 in)
1946
105.9 mm (4.2 in)
1947
81.3 mm (3.2 in)
1948
66.0 mm (2.6 in)
1949
41.9 mm (1.6 in)
1950
70.1 mm (2.8 in)
1951
109.2 mm (4.3 in)
1952
118.6 mm (4.7 in)
1953
58.7 mm (2.3 in)
1954
80.3 mm (3.2 in)
1955
138.9 mm (5.5 in)
1956
67.3 mm (2.6 in)
1957
81.5 mm (3.2 in)
1958
59.7 mm (2.4 in)
1959
68.8 mm (2.7 in)
1960
57.2 mm (2.3 in)
1961
53.3 mm (2.1 in)
1962
80.5 mm (3.2 in)
1963
72.9 mm (2.9 in)
1964
56.1 mm (2.2 in)
1965
85.3 mm (3.4 in)
1966
97.3 mm (3.8 in)
1967
63.8 mm (2.5 in)
1968
116.8 mm (4.6 in)
1969
71.6 mm (2.8 in)
1970
49.3 mm (1.9 in)
1971
230.1 mm (9.1 in)
1972
107.4 mm (4.2 in)
1973
127.5 mm (5.0 in)
1974
65.8 mm (2.6 in)
1975
80.0 mm (3.1 in)
1976
75.4 mm (3.0 in)
1977
95.3 mm (3.8 in)
1978
62.7 mm (2.5 in)
1979
105.9 mm (4.2 in)
1980
71.9 mm (2.8 in)
1981
105.4 mm (4.1 in)
1982
46.5 mm (1.8 in)
1983
75.7 mm (3.0 in)
1984
87.6 mm (3.4 in)
1985
72.4 mm (2.9 in)
1986
71.1 mm (2.8 in)
1987
76.2 mm (3.0 in)
1988
98.6 mm (3.9 in)
1989
89.2 mm (3.5 in)
1990
58.4 mm (2.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Morris Plains 1 W, 1941 to 1990. The record is 246.9 mm (9.7 in) in 1971, marked on the chart; the median year is 119.3 mm (4.7 in).
Wettest five days (Rx5day) at Morris Plains 1 W by year
Year
Wettest five days (Rx5day)
1941
74.4 mm (2.9 in)
1942
190.3 mm (7.5 in)
1943
108.9 mm (4.3 in)
1944
150.1 mm (5.9 in)
1945
125.0 mm (4.9 in)
1946
148.1 mm (5.8 in)
1947
146.8 mm (5.8 in)
1948
129.8 mm (5.1 in)
1949
133.9 mm (5.3 in)
1950
95.6 mm (3.8 in)
1951
109.2 mm (4.3 in)
1952
138.2 mm (5.4 in)
1953
94.1 mm (3.7 in)
1954
107.2 mm (4.2 in)
1955
208.8 mm (8.2 in)
1956
85.7 mm (3.4 in)
1957
100.8 mm (4.0 in)
1958
130.8 mm (5.1 in)
1959
91.5 mm (3.6 in)
1960
130.8 mm (5.1 in)
1961
81.5 mm (3.2 in)
1962
80.8 mm (3.2 in)
1963
106.6 mm (4.2 in)
1964
61.2 mm (2.4 in)
1965
85.3 mm (3.4 in)
1966
121.7 mm (4.8 in)
1967
99.6 mm (3.9 in)
1968
146.7 mm (5.8 in)
1969
159.0 mm (6.3 in)
1970
101.2 mm (4.0 in)
1971
246.9 mm (9.7 in)
1972
160.1 mm (6.3 in)
1973
148.1 mm (5.8 in)
1974
83.0 mm (3.3 in)
1975
173.4 mm (6.8 in)
1976
92.4 mm (3.6 in)
1977
118.7 mm (4.7 in)
1978
103.9 mm (4.1 in)
1979
187.0 mm (7.4 in)
1980
94.7 mm (3.7 in)
1981
119.8 mm (4.7 in)
1982
96.3 mm (3.8 in)
1983
115.1 mm (4.5 in)
1984
150.3 mm (5.9 in)
1985
137.5 mm (5.4 in)
1986
125.5 mm (4.9 in)
1987
99.1 mm (3.9 in)
1988
158.1 mm (6.2 in)
1989
159.1 mm (6.3 in)
1990
78.1 mm (3.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at Morris Plains 1 W, 1941 to 1990. The record is 37 days in 1964, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at Morris Plains 1 W by year
Year
Longest dry spell (CDD)
1941
21 days
1942
24 days
1943
19 days
1944
16 days
1945
16 days
1946
19 days
1947
23 days
1948
17 days
1949
16 days
1950
16 days
1951
15 days
1952
16 days
1953
16 days
1954
17 days
1955
17 days
1956
14 days
1957
12 days
1958
14 days
1959
25 days
1960
17 days
1961
21 days
1962
19 days
1963
26 days
1964
37 days
1965
14 days
1966
15 days
1967
16 days
1968
26 days
1969
17 days
1970
18 days
1971
17 days
1972
22 days
1973
25 days
1974
15 days
1975
12 days
1976
19 days
1977
22 days
1978
19 days
1979
14 days
1980
27 days
1981
25 days
1982
14 days
1983
17 days
1984
10 days
1985
19 days
1986
16 days
1987
12 days
1988
22 days
1989
17 days
1990
8 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
42 years with a frost
Across 42 years with a frost, the median last spring frost at Morris Plains 1 W falls on 6 May and the median first autumn frost on 7 October, which leaves a median of 157 days between them.
Fitted over all years, the growing season changes by +0.3 days per decade at this station.
Frost dates and growing season at Morris Plains 1 W
Measure
Median, all years
Earliest period
Recent period (1959 to 1989)
Recent against earliest
Fitted trend
Last spring frost
6 May
n/a
4 May
n/a
+0.1 days per decade
First autumn frost
7 October
n/a
8 October
n/a
+0.4 days per decade
Growing days
157 days
n/a
159 days
n/a
+0.3 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
47 years, 1942 to 1989
A day with at least 75.2 mm (3.0 in) of rain is expected about once in 2 years. A day with at least 190.6 mm (7.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Morris Plains 1 W: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
75.2 mm (3.0 in)
5 years
99.2 mm (3.9 in)
10 years
117.5 mm (4.6 in)
25 years
143.9 mm (5.7 in)
50 years
166.1 mm (6.5 in)
Longer than the 47 years of record
100 years
190.6 mm (7.5 in)
Longer than the 47 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, 47 years of values from 1942 to 1989.
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: 230.1 mm (9.1 in) in 1971; 138.9 mm (5.5 in) in 1955; 127.5 mm (5.0 in) in 1973.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Morris Plains 1 W standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Morris Plains 1 W 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.