A computer's guess at future radar. The rock does not endorse the future.
2h agonow+30m
The Rocktionary: every weather term, explained by a rock
Rockreation: pick a game
Hanging out: Tic Tac Toe
The Rockord Book
All records live on this device. The rock keeps no receipts. You keep them.
Rock, Time, Weather
?vs?
Time grinds rock. Rock endures weather. Weather does not care what year it is.
The weather you throw is whatever is outside right now.
Rocktoid or Rubbish
Rocktoid, or rubbish?
Warmer or Colder
Asking both towns...
or
Name That Sky
What is the rock standing in?
Weather Rocktoid
A new Rocktoid every midnight. The rock reads a lot.
The rock's instrument panel
Reading the instruments...
Remote Rocks: station a rock anywhere you love
Put a rock in Mom's yard, the lake house, a kid's college town. Each one stands in that sky and reports it here. Tap a rock for its forecast; the pencil renames it.
Tap me on the shoulder turns on browser notifications: when a warning or watch lands on one of your rocks, you get a notification, as long as the site is open in a tab somewhere.
Remote Rocks live on this device. We do not track you, so a rock you station on your phone will not appear on your computer or tablet, and the other way around. That is the privacy working, not a bug. Forecasts and alerts travel from here straight to the weather services, same as always.
Settings
ToneHow the site dresses. System follows your device.
Shoulder tapsBrowser notifications when a warning lands on one of your Remote Rocks. Only while the site is open in a tab.
Keep me in your pocketPut the rock on your home screen. Same site, no store, no middleman, and it opens even with no signal.
This deviceEverything the rock remembers lives right here: your town, your rocks, your settings, your tic tac toe record. One tap and it is all forgotten.
Build
Keep me in your pocket
Same site, no store, no middleman. I get my own icon, I open full screen, and I still open when you have no signal.
Tap your browser's own Share or menu button: the square with the arrow on an iPhone, the ⋮ or ⋯ menu in the corner on most others. It has to be the browser's button; websites are not allowed to press it for you.
Find and tap Add to Home Screen. Some browsers call it Install.
Confirm. That is the whole ceremony.
Mount Ephraim, NJ Weather
Mount Ephraim, New Jersey sits at 39.8795, -75.0918. Its warmest month is July, when the day usually reaches 89F, and its coldest is January, when the night usually falls to 28F. April is the wettest, with rain on about 12 days. The hottest day in the station record is 104F on July 5, 1999, and the coldest night -5F on January 19, 1994. 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 Mount Ephraim weather
Mount Ephraim sits at 39.8795, -75.0918 and covers about 0.884 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 Mount Ephraim
Mount Ephraim is warmest in July, when the day usually reaches 89F, and coldest in January, when the night usually falls to 28F. April is the wettest month, with rain on about 12 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
41F
28F
11
3
February
45F
30F
9
2
March
53F
37F
10
1
April
66F
47F
12
0
May
75F
57F
12
0
June
84F
66F
11
0
July
89F
72F
10
0
August
87F
70F
9
0
September
80F
63F
8
0
October
67F
52F
9
0
November
56F
42F
8
0
December
46F
34F
10
2
Thirty-year normals, 1991 to 2020, computed from the daily record, measured at the Phila Franklin Inst station 7 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.
Mount Ephraim weather history, back to 1940
Pick any month back to 1940 and see what the archive holds for Mount Ephraim: the reanalysis record of what happened, day by day.
Reading this month last year to start you off.
Mount Ephraim weather records
In 45,097 days of observations Mount Ephraim has been as hot as 104F and as cold as -5F. Not averages: the actual days.
Hottest day
104F
July 5, 1999
Coldest night
-5F
January 19, 1994
Wettest day
8.60 in
August 28, 2011
Biggest snow
16.0 in
February 23, 2026
NOAA GHCN daily station records, observed 1993 to 2026: temperature at the Phila Franklin Inst station, 7 miles away; precipitation at the Somerdale 4 Sw station, 3.9 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 Mount Ephraim weather
Common questions
What is the weather usually like in Mount Ephraim, NJ?
Mount Ephraim is warmest in July, when the day usually reaches 89F, and coldest in January, when the night usually falls to 28F. Rain falls on roughly 119 days a year, most often in April. Averages are thirty-year normals, 1991 to 2020, computed from the nearest NOAA station's own daily record.
How much does it rain in Mount Ephraim, NJ?
About 119 days a year see at least a hundredth of an inch, which is the Weather Service's measurable-precipitation mark. April is the wettest month with rain on about 12 of its days, and September the driest with about 8.
Does it snow in Mount Ephraim, 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 Mount Ephraim, NJ?
The hottest day measured for Mount Ephraim reached 104F on July 5, 1999, and the coldest night -5F on January 19, 1994. Both are real NOAA station measurements from the GHCN daily archive, observed 1993 to 2026, at the Phila Franklin Inst station. Not estimates, though the official state record may live at a different station.
Can I look up past weather for Mount Ephraim, 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 Mount Ephraim 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.