Hopatcong Hills weather in April

In April, Hopatcong Hills sees average daytime highs of 59°F and overnight lows near 41°F, with 3.7 in of precipitation across 10.8 wet days and about 13.1 hours of daylight. It is the 7th-warmest and 7th-wettest month of the year here.

Highs climb over the month, from about 54°F in the first days to 64°F by the end. The sky is clear or mostly clear about 25% of the time in April, and the air most often feels dry.

Daylight stretches from about 12 h 24 min at the start of April to 13 h 42 min by month's end. Set against the rest of the year, April is Hopatcong Hills's 11th-clearest and 4th-windiest month. For the whole year in context, see Hopatcong Hills's year-round climate.

Daytime high
59°
7th warmest
Overnight low
41°
6th coldest
Precipitation
3.7 in
10.8 wet days
Daylight
13 h 06 min
5:26 AM – 6:32 PM
Cloud cover
65%
11th clearest
Wind
7 mph
4th windiest
Solar energy
4.94 kWh/m²
Travel score
4.4
out of 10

Hopatcong Hills is human settlement in Sussex County, New Jersey, United States of America.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 54°F in the first days to 64°F by the end.

A typical April day in Hopatcong Hills reaches about 59°F in the afternoon and slips back to 41°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 47°F and 73°F. Set against its neighbours, April runs about 12°F warmer than March and about 10°F cooler than May.

20°40°60°80°151015202530
Avg high (°F)Avg low (°F)
15336
25437
35437
45537
55538
65638
75638
85639
95739
105740
115840
125840
135941
145941
156041
166042
176042
186142
196143
206143
216243
226244
236244
246244
256344
266345
276345
286445
296446
306446

How April really feels in Hopatcong Hills

Once humidity and wind are folded in, April averages 0 days that feel above 90°F and 4 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
4
wind chill below the day's low

The story in April is cold — wind chill drags the overnight "feels like" below the raw low.

Hopatcong Hills weather by month

How April compares with the rest of the year at a glance. April is the 7th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan36° / 22°3.59.55.69.40.0
Feb39° / 23°3.08.84.610.40.0
Mar47° / 31°4.110.94.111.71.5
Apr59° / 41°3.710.80.713.14.4
May69° / 51°3.711.7014.36.1
Jun78° / 60°3.911.3014.96.4
Jul83° / 65°3.710.7014.65.7
Aug81° / 64°3.610.5013.66.3
Sep74° / 56°4.29.6012.36.9
Oct62° / 45°4.090.210.95.4
Nov50° / 35°3.28.319.72.5
Dec40° / 28°4.01049.10.2

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 14% of April, with mostly cloudy or overcast conditions the remaining 61%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13961
23961
33961
43961
53961
63961
73961
84060
94159
104159
114159
124060
133961
143961
153961
163961
173961
183961
193961
203961
213961
223961
233961
243961
253961
263862
273862
283862
293961
303862

Chance of precipitation in April

Any precipitationSnow

Hopatcong Hills gets around 3.7 in of rain and snow over 10.8 wet days in April. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 37% and peaks near 38% on the wettest days, and about 1 day brings snow.

0%10%20%30%40%50%151015202530
Rain chance (%)Snow chance (%)
1387
2386
3386
4386
5376
6375
7375
8365
9364
10364
11364
12363
13363
14363
15362
16362
17362
18371
19371
20371
21371
22371
23370
24370
25370
26370
27370
28370
29370
30370

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

Most of April feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, April lands in the dry band about 96% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
19910
29910
39910
49910
59910
69910
79820
89820
99820
109820
119820
129730
139730
149631
159631
169631
179541
189541
199541
209541
219541
229541
239541
249541
259451
269451
279352
289262
299262
309172

Wind in April

Winds average 7 mph in April.

Across April, daily wind ranges from about 7 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
18light breeze
28light breeze
38light breeze
47light breeze
57light breeze
67light breeze
77light breeze
87light breeze
97light breeze
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 24 min at the start of April to 13 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 78 minutes over April. Sunrise moves from 5:51 AM to 5:05 AM, and sunset from 6:16 PM to 6:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:516:16
212.55:496:17
312.55:486:18
412.55:466:19
512.65:446:20
612.65:436:21
712.75:416:22
812.75:396:23
912.85:386:24
1012.85:366:25
1112.95:346:26
1212.95:336:27
1313.05:316:28
1413.05:296:29
1513.05:286:31
1613.15:266:32
1713.15:256:33
1813.25:236:34
1913.25:216:35
2013.35:206:36
2113.35:186:37
2213.45:176:38
2313.45:156:39
2413.45:146:40
2513.55:126:41
2613.55:116:42
2713.65:106:43
2813.65:086:45
2913.65:076:46
3013.75:056:47

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 4.94 kWh/m².

For context, solar energy here swings from a low near 1.71 kWh/m² to a high of 5.96 kWh/m² in June across the year — April's 4.94 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.6Bright
54.6Bright
64.6Bright
74.7Bright
84.7Bright
94.8Bright
104.8Bright
114.8Bright
124.9Bright
134.9Bright
144.9Bright
155.0Bright
165.0Bright
175.0Bright
185.0Bright
195.0Bright
205.1Bright
215.1Bright
225.1Bright
235.1Bright
245.2Bright
255.2Bright
265.2Bright
275.2Bright
285.2Bright
295.2Bright
305.3Bright
Planning a trip in April

Hazard calendar for Hopatcong Hills

In seasonPeak

None of Hopatcong Hills's seasonal hazards are active in April. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Hopatcong Hills sits in the Atlantic hurricane belt; the season peaks August–October.

Atlantic hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is April a good time to visit Hopatcong Hills?

Our two travel scores rate April for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

4.4
Sightseeing
7th-best month of the year
0.6
Beach & pool
7th-best month of the year

April is a reasonable time to visit Hopatcong Hills for sightseeing.

What to pack for Hopatcong Hills in April

From April's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In April, Hopatcong Hills sees daytime highs around 59°F and nights near 41°F. Worth packing: a warm layer, rain gear and sun protection. About 11 days see rain.

a warm layerrain gearsun protection

UV index in Hopatcong Hills in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Hopatcong Hills peaks around July 10 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 10UV 8Dec 22UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun8Very high
Jul8Very high
Aug6High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Hopatcong Hills in April

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where April falls, not just the annual average.

Air quality in Hopatcong Hills is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (November, 7 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1416 µg/m³Nov 157 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar12Good
Apr12Moderate
May15Moderate
Jun15Moderate
Jul16Moderate
Aug13Moderate
Sep11Good
Oct8Good
Nov7Good
Dec8Good
Location & terrain

Where is Hopatcong Hills?

Hopatcong Hills sits at 40.9°N, 74.7°W, 1,102 ft above sea level, in United States. The nearest listed city is Sparta, 6.2 mi away.

Topography around Hopatcong Hills

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Hopatcong Hills.

Within 2 miles, the terrain around Hopatcong Hills has only modest variations in elevation — a maximum elevation change of 531 ft around an average of 968 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 932 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,467 ft.

The land around Hopatcong Hills is covered by trees (73%) within 2 miles, trees (80%) within 10 miles, and trees (74%) within 50 miles.

2 miles
531 ft
10 miles
932 ft
50 miles
2,467 ft
treesgrasslandcroplandartificial surfaceswaterwetland
April weather nearby: Sparta 6.2 mi · Dover 6.8 mi · Randolph 8.1 mi · Denville 11 mi · Parsippany 14 mi · Morristown 14 mi · Basking Ridge 17 mi · Madison 19 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Hopatcong Hills (40.944°, -74.6707°, elevation 1,102 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).