Lebanon weather in May

In May, Lebanon sees average daytime highs of 72°F and overnight lows near 54°F, with 3.6 in of rain across 11.9 wet days and about 14.2 hours of daylight. It is the 5th-warmest and 7th-wettest month of the year here.

Highs climb over the month, from about 68°F in the first days to 76°F by the end. The sky is clear or mostly clear about 24% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 42 min at the start of May to 14 h 36 min by month's end. Set against the rest of the year, May is Lebanon's 8th-clearest and 8th-windiest month. For the whole year in context, see Lebanon's year-round climate.

Daytime high
72°
5th warmest
Overnight low
54°
8th coldest
Rainfall
3.6 in
11.9 wet days
Daylight
14 h 12 min
4:55 AM – 7:09 PM
Cloud cover
64%
8th clearest
Wind
6 mph
8th windiest
Solar energy
5.67 kWh/m²
Travel score
6.3
out of 10

Lebanon is county seat of Lebanon County, Pennsylvania, United States.

Density
2,366/km²
people per km²
Founded
1720

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 68°F in the first days to 76°F by the end.

A typical May day in Lebanon reaches about 72°F in the afternoon and slips back to 54°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 60°F and 84°F. Set against its neighbours, May runs about 9°F warmer than April and about 9°F cooler than June.

40°60°80°151015202531
Avg high (°F)Avg low (°F)
16749
26849
36849
46850
56950
66950
76951
86951
96951
107052
117052
127052
137152
147153
157153
167153
177254
187254
197354
207355
217355
227455
237456
247456
257556
267557
277657
287658
297658
307658
317759

How May really feels in Lebanon

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

May sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Lebanon weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan38° / 25°3.49.34.49.50.0
Feb41° / 26°3.08.9410.40.2
Mar50° / 33°3.910.53.211.72.3
Apr62° / 44°3.810.80.4135.1
May72° / 54°3.611.9014.26.3
Jun81° / 63°3.611.3014.86.0
Jul85° / 68°3.610.2014.65.2
Aug83° / 66°3.210013.65.8
Sep76° / 59°4.39.4012.36.9
Oct64° / 47°3.78.70.110.95.9
Nov53° / 37°3.28.40.79.83.0
Dec43° / 30°3.79.32.99.20.5

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 18% of May, with mostly cloudy or overcast conditions the remaining 58%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14258
24357
34456
44357
54357
64357
74357
84357
94258
104258
114258
124258
134258
144258
154258
164258
174159
184060
194060
204060
214060
224060
234159
244258
254258
264258
274357
284357
294258
304357
314357

Chance of precipitation in May

Any precipitation

Lebanon gets around 3.6 in of rain over 11.9 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 38% and peaks near 40% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
138
238
338
439
539
639
739
840
940
1040
1140
1239
1339
1439
1538
1638
1738
1837
1937
2037
2137
2237
2337
2437
2537
2637
2737
2837
2937
3037
3137

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the dry band about 67% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
18512300
28412400
38313400
48114500
58015500
67915600
77816600
87716700
97617700
107417810
117317910
127218910
137118920
1470181020
1569181030
1668181130
1767181140
1866181240
1964181350
2063181360
2161181470
2259181580
2358181680
2457181690
2555191790
26541917100
27531918100
28521918110
29511918110
30492019121
31482019121

Wind in May

Winds average 6 mph in May.

Across May, 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.

0246810151015202531
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 42 min at the start of May to 14 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 54 minutes over May. Sunrise moves from 5:12 AM to 4:44 AM, and sunset from 6:54 PM to 7:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:126:54
213.75:116:55
313.85:106:56
413.85:086:57
513.85:076:58
613.95:066:59
713.95:057:00
814.05:037:01
914.05:027:02
1014.05:017:03
1114.15:007:04
1214.14:597:05
1314.14:587:06
1414.24:577:07
1514.24:567:08
1614.24:557:09
1714.34:547:10
1814.34:537:11
1914.34:527:12
2014.44:517:13
2114.44:517:14
2214.44:507:14
2314.44:497:15
2414.54:487:16
2514.54:487:17
2614.54:477:18
2714.54:467:19
2814.64:467:20
2914.64:457:20
3014.64:457:21
3114.64:447:22

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.67 kWh/m².

For context, solar energy here swings from a low near 1.76 kWh/m² to a high of 6.09 kWh/m² in June across the year — May's 5.67 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.4Bright
45.4Bright
55.5Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.5Bright
135.6Bright
145.6Bright
155.6Bright
165.6Bright
175.6Bright
185.7Bright
195.7Bright
205.7Bright
215.7Bright
225.8Bright
235.8Bright
245.8Bright
255.8Bright
265.8Bright
275.9Bright
285.9Bright
295.9Bright
305.9Bright
315.9Bright
Planning a trip in May

Is May a good time to visit Lebanon?

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

6.3
Sightseeing
2nd-best month of the year
4.4
Beach & pool
5th-best month of the year

May is a reasonable time to visit Lebanon for sightseeing.

What to pack for Lebanon in May

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

In May, Lebanon sees daytime highs around 72°F and nights near 54°F. Worth packing: light clothes, rain gear and sun protection. About 12 days see rain.

light clothesrain gearsun protection

UV index in Lebanon in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Lebanon peaks around June 22 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 1 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJun 22UV 8Dec 21UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul8Very high
Aug6High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Lebanon in May

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Lebanon is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (November, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1317 µg/m³Nov 138 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Good
Mar13Moderate
Apr14Moderate
May15Moderate
Jun16Moderate
Jul17Moderate
Aug15Moderate
Sep12Good
Oct9Good
Nov8Good
Dec9Good
Location & terrain

Where is Lebanon?

Lebanon sits at 40.3°N, 76.4°W, 469 ft above sea level, in United States. The nearest listed city is Lancaster, 22 mi away.

Topography around Lebanon

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

Within 2 miles, the terrain around Lebanon has only modest variations in elevation — a maximum elevation change of 256 ft around an average of 525 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,201 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,178 ft.

The land around Lebanon is covered by trees (32%), grassland (27%) and artificial surfaces (27%) within 2 miles, trees (36%), cropland (36%) and grassland (23%) within 10 miles, and trees (58%) and cropland (21%) within 50 miles.

2 miles
256 ft
10 miles
1,201 ft
50 miles
2,178 ft
treesgrasslandcroplandartificial surfaceswater
May weather nearby: Lancaster 22 mi · Harrisburg 25 mi · Reading 25 mi · York 31 mi · Pottstown 40 mi · Carlisle 42 mi · Limerick 47 mi · Hanover 48 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 Lebanon (40.3409°, -76.4113°, elevation 469 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).