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New Gretna, NJ Weather
New Gretna, New Jersey sits at 39.5878, -74.4545. Its warmest month is July, when the day usually reaches 86F, and its coldest is January, when the night usually falls to 25F. January is the wettest, with rain on about 11 days. The hottest day in the station record is 106F on June 28, 1969, and the coldest night -11F on February 12, 1979. This page carries live conditions, an hour by hour timeline, a ten day outlook, radar, monthly averages and searchable daily history back to 1940.
About New Gretna weather
New Gretna sits at 39.5878, -74.4545 and covers about 0.846 square miles. The forecast above is live: current conditions lead with the HRRR model, corrected against the nearest reporting station and against radar overhead, because a model can lag a storm and the radar cannot.
The tabs at the top of this page carry the hour by hour timeline, the ten day outlook and live radar. Where the models disagree about a day, the rock says so on the day rather than quietly picking a winner.
The rock grades itself against what actually happened and publishes the result whether it flatters it or not. Those standings live in the Receipts.
Where these numbers come from
Current conditions and forecast: NOAA forecast grids (the National Weather Service digital forecast, the National Blend of Models, HRRR and GFS) decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
Radar: NOAA MRMS merged reflectivity, rendered into tiles by myweatherrock.
Monthly averages and records: computed by myweatherrock from NOAA GHCN-Daily station records at the nearest qualifying station, named on this page with its distance. Measurements, not estimates.
Daily history search: the town's own NOAA GHCN-Daily station file, held on our server, measurements by day. Months the station missed fall back to the Open-Meteo historical archive (reanalysis), and the page says so when it does.
What the weather is usually like in New Gretna
New Gretna is warmest in July, when the day usually reaches 86F, and coldest in January, when the night usually falls to 25F. January is the wettest month, with rain on about 11 days of it.
Usual high and low, by month
Days with rain, by month
The same year as numbers
Month
Usual high
Usual low
Rain days
Snow days
January
43F
25F
11
3
February
46F
26F
10
3
March
52F
32F
11
1
April
63F
42F
11
0
May
72F
51F
11
0
June
81F
61F
10
0
July
86F
67F
10
0
August
84F
65F
9
0
September
78F
58F
8
0
October
67F
46F
9
0
November
57F
36F
9
0
December
48F
29F
11
1
Thirty-year normals, 1991 to 2020, computed from the daily record, measured at the Atlantic City Intl Ap station 11.1 miles away. A rain day means at least a hundredth of an inch fell, the same measurable-precipitation mark the Weather Service uses. Source: computed from the station record, NOAA GHCN daily.
New Gretna weather history, back to 1940
Pick any month back to 1940 and see what the archive holds for New Gretna: the reanalysis record of what happened, day by day.
Reading this month last year to start you off.
New Gretna weather records
In 97,368 days of observations New Gretna has been as hot as 106F and as cold as -11F. Not averages: the actual days.
Hottest day
106F
June 28, 1969
Coldest night
-11F
February 12, 1979
Wettest day
11.10 in
August 20, 1997
Biggest snow
18.4 in
December 26, 2010
NOAA GHCN daily station records, observed 1958 to 2025: temperature at the Atlantic City Intl Ap station, 11.1 miles away. Station measurements, not estimates. Record dates reflect the station's own observation schedule, and the official state record may live at a different station.
Common questions about New Gretna weather
Common questions
What is the weather usually like in New Gretna, NJ?
New Gretna is warmest in July, when the day usually reaches 86F, and coldest in January, when the night usually falls to 25F. Rain falls on roughly 120 days a year, most often in January. Averages are thirty-year normals, 1991 to 2020, computed from the nearest NOAA station's own daily record.
How much does it rain in New Gretna, NJ?
About 120 days a year see at least a hundredth of an inch, which is the Weather Service's measurable-precipitation mark. January is the wettest month with rain on about 11 of its days, and September the driest with about 8.
Does it snow in New Gretna, NJ?
Yes. Snow falls on about 8 days a year, most often in January, which averages about 3 snowy days. Those are days with measurable snowfall, not days with snow lying on the ground.
What is the hottest it has ever been in New Gretna, NJ?
The hottest day measured for New Gretna reached 106F on June 28, 1969, and the coldest night -11F on February 12, 1979. Both are real NOAA station measurements from the GHCN daily archive, observed 1958 to 2025, at the Atlantic City Intl Ap station. Not estimates, though the official state record may live at a different station.
Can I look up past weather for New Gretna, NJ?
Yes, and for free. The History tab on this page takes any month back to 1940 and shows every day of it: the high, the low, what fell, and that month's hottest and coldest day. No account and no payment.
Is the New Gretna forecast on this page free, and does it track me?
It is free, carries no advertising, and needs no account. Nothing about a visitor leaves the device except the coordinates needed to fetch a forecast, and those are not stored against anyone.