Bethlehem weather in April

In April, Bethlehem sees average daytime highs of 60°F and overnight lows near 42°F, with 3.9 in of precipitation across 10.7 wet days and about 13 hours of daylight. It is the 7th-warmest and 6th-wettest month of the year here.

Highs climb over the month, from about 55°F in the first days to 65°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 Bethlehem's 10th-clearest and 4th-windiest month. For the whole year in context, see Bethlehem's year-round climate.

Daytime high
60°
7th warmest
Overnight low
42°
6th coldest
Precipitation
3.9 in
10.7 wet days
Daylight
13 h 06 min
5:29 AM – 6:34 PM
Cloud cover
64%
10th clearest
Wind
7 mph
4th windiest
Solar energy
4.97 kWh/m²
Travel score
4.7
out of 10

Bethlehem is city in Lehigh and Northampton counties, Pennsylvania, USA.

Density
1,487/km²
people per km²
Founded
1741

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 55°F in the first days to 65°F by the end.

A typical April day in Bethlehem reaches about 60°F in the afternoon and slips back to 42°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 48°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)
15437
25537
35537
45638
55638
65738
75739
85839
95839
105840
115940
125940
136041
146041
156142
166142
176142
186242
196243
206243
216343
226344
236344
246444
256445
266445
276445
286546
296546
306546

How April really feels in Bethlehem

Once humidity and wind are folded in, April averages 0 days that feel above 90°F and 3 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
3
wind chill below the day's low

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

Bethlehem weather by month

How April compares with the rest of the year at a glance. April is the 7th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan37° / 23°3.69.65.29.40.0
Feb40° / 24°3.18.94.610.40.1
Mar48° / 31°4.110.93.811.71.8
Apr60° / 42°3.910.70.5134.7
May70° / 51°3.711.4014.26.2
Jun79° / 60°4.111014.86.3
Jul84° / 65°3.610.2014.65.4
Aug82° / 64°3.79.8013.66.1
Sep75° / 56°4.38.8012.37.0
Oct63° / 45°4.18.70.210.95.7
Nov51° / 35°3.38.30.89.72.7
Dec41° / 28°4.19.93.49.10.3

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 15% of April, with mostly cloudy or overcast conditions the remaining 60%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13961
23961
33961
43961
53961
64060
74159
84159
94159
104159
114159
124159
134159
144159
154060
164060
174060
184060
194060
204060
213961
223961
233961
243961
253961
263961
274060
284060
294159
304159

Chance of precipitation in April

Any precipitationSnow

Bethlehem gets around 3.9 in of rain and snow over 10.7 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 36% 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 (%)
1386
2386
3375
4375
5375
6374
7364
8364
9353
10353
11353
12353
13352
14352
15362
16361
17361
18361
19361
20361
21360
22360
23360
24360
25360
26360
27360
28360
29360
30350

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 95% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
19910
29910
39820
49820
59820
69820
79820
89820
99730
109730
119631
129631
139541
149541
159541
169541
179541
189451
199451
209451
219352
229352
239352
249352
259262
269262
279172
289172
299082
308983

Wind in April

Winds average 7 mph in April.

Across April, daily wind ranges from about 6 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
296calm
306calm

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 5:54 AM to 5:09 AM, and sunset from 6:18 PM to 6:49 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:546:18
212.45:526:19
312.55:516:20
412.55:496:21
512.65:476:22
612.65:466:24
712.75:446:25
812.75:426:26
912.85:416:27
1012.85:396:28
1112.95:376:29
1212.95:366:30
1312.95:346:31
1413.05:336:32
1513.05:316:33
1613.15:296:34
1713.15:286:35
1813.25:266:36
1913.25:256:37
2013.35:236:38
2113.35:226:39
2213.35:206:40
2313.45:196:41
2413.45:176:43
2513.55:166:44
2613.55:146:45
2713.55:136:46
2813.65:116:47
2913.65:106:48
3013.75:096:49

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 4.97 kWh/m².

For context, solar energy here swings from a low near 1.73 kWh/m² to a high of 5.99 kWh/m² in June across the year — April's 4.97 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.6Bright
44.6Bright
54.6Bright
64.7Bright
74.7Bright
84.8Bright
94.8Bright
104.8Bright
114.9Bright
124.9Bright
134.9Bright
145.0Bright
155.0Bright
165.0Bright
175.0Bright
185.0Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.2Bright
245.2Bright
255.2Bright
265.2Bright
275.2Bright
285.3Bright
295.3Bright
305.3Bright
Planning a trip in April

Is April a good time to visit Bethlehem?

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

4.7
Sightseeing
7th-best month of the year
0.8
Beach & pool
7th-best month of the year

April is a reasonable time to visit Bethlehem for sightseeing.

What to pack for Bethlehem in April

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

In April, Bethlehem sees daytime highs around 60°F and nights near 42°F. Worth packing: a warm layer, rain gear and sun protection. About 11 days see rain.

a warm layerrain gearsun protection

UV index in Bethlehem 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 Bethlehem 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 Bethlehem 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 Bethlehem is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (November, 9 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1518 µg/m³Nov 149 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb13Moderate
Mar14Moderate
Apr14Moderate
May16Moderate
Jun17Moderate
Jul18Moderate
Aug15Moderate
Sep13Moderate
Oct10Good
Nov9Good
Dec10Good
Location & terrain

Where is Bethlehem?

Bethlehem sits at 40.6°N, 75.4°W, 358 ft above sea level, in United States. The nearest listed city is Allentown, 6.2 mi away.

Topography around Bethlehem

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

Within 2 miles, the terrain around Bethlehem has only modest variations in elevation — a maximum elevation change of 778 ft around an average of 358 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,024 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,516 ft.

The land around Bethlehem is covered by trees (43%) and artificial surfaces (36%) within 2 miles, trees (49%) and grassland (21%) within 10 miles, and trees (73%) within 50 miles.

2 miles
778 ft
10 miles
1,024 ft
50 miles
2,516 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
April weather nearby: Allentown 6.2 mi · Whitehall Township 7.5 mi · Easton 8.7 mi · Lansdale 27 mi · Limerick 29 mi · Pottstown 30 mi · Norristown 35 mi · Phoenixville 35 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 Bethlehem (40.6259°, -75.3705°, elevation 358 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. 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).