Mount Vernon weather in May

In May, Mount Vernon sees average daytime highs of 70°F and overnight lows near 52°F, with 4.4 in of rain across 13.7 wet days and about 14.2 hours of daylight. It is the 5th-warmest and 2nd-wettest month of the year here.

Highs climb over the month, from about 66°F in the first days to 74°F by the end. The sky is clear or mostly clear about 21% 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 Mount Vernon's 6th-clearest and 8th-windiest month. For the whole year in context, see Mount Vernon's year-round climate.

Daytime high
70°
5th warmest
Overnight low
52°
8th coldest
Rainfall
4.4 in
13.7 wet days
Daylight
14 h 12 min
5:19 AM – 7:33 PM
Cloud cover
66%
6th clearest
Wind
7 mph
8th windiest
Solar energy
5.67 kWh/m²
Travel score
5.9
out of 10

Mount Vernon is city in Knox County, Ohio, United States.

Density
674/km²
people per km²
Founded
1805

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 66°F in the first days to 74°F by the end.

A typical May day in Mount Vernon reaches about 70°F in the afternoon and slips back to 52°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 58°F and 82°F. Set against its neighbours, May runs about 10°F warmer than April and about 8°F cooler than June.

40°60°80°151015202531
Avg high (°F)Avg low (°F)
16547
26647
36648
46748
56749
66749
76849
86849
96850
106950
116950
126951
136951
146951
157052
167052
177052
187153
197153
207153
217254
227254
237254
247355
257355
267355
277456
287456
297456
307457
317557

How May really feels in Mount Vernon

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.

Mount Vernon weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan35° / 21°3.311.46.99.40.0
Feb38° / 23°2.69.45.210.40.0
Mar48° / 31°3.811.73.611.71.6
Apr61° / 42°4.612.91.1134.5
May70° / 52°4.413.7014.25.9
Jun79° / 61°4.212.1014.86.3
Jul82° / 65°3.611.5014.66.2
Aug80° / 63°3.110.4013.66.5
Sep74° / 56°3.09012.37.0
Oct62° / 45°3.19.90.110.95.3
Nov49° / 35°3.29.81.79.82.0
Dec39° / 27°3.310.14.59.20.1

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 17% of May, with mostly cloudy or overcast conditions the remaining 62%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13466
23565
33664
43664
53664
63664
73664
83862
93862
103862
113862
123862
133763
143763
153763
163862
173862
183862
193862
203961
213862
223862
233961
244060
254060
264159
274159
284060
294159
304159
314159

Chance of precipitation in May

Any precipitation

Mount Vernon gets around 4.4 in of rain over 13.7 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 44% and peaks near 46% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
145
245
345
445
546
646
746
846
946
1045
1145
1245
1344
1444
1544
1644
1744
1843
1943
2043
2143
2243
2343
2443
2543
2643
2743
2843
2943
3043
3142

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 69% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1861130
2861130
3841240
4841240
5821350
6811360
7801460
8781471
9771481
10771481
11751591
127415101
137315102
147215112
157215112
167016122
176816133
186816133
196616144
206516154
216317155
226117166
236017176
245917177
255718187
265718187
275518198
285419198
295319208
305219209
315120209

Wind in May

Winds average 7 mph in May.

Across May, 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.

051015151015202531
Wind speed (mph)Feels
18light breeze
28light breeze
38light breeze
48light breeze
58light breeze
68light breeze
78light breeze
88light breeze
98light breeze
108light breeze
118light breeze
128light breeze
138light breeze
148light breeze
157light breeze
167light breeze
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

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 5:36 AM to 5:08 AM, and sunset from 7:18 PM to 7:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:367:18
213.75:357:19
313.85:347:20
413.85:327:21
513.85:317:22
613.95:307:23
713.95:297:24
814.05:287:25
914.05:267:26
1014.05:257:27
1114.15:247:28
1214.15:237:29
1314.15:227:30
1414.25:217:31
1514.25:207:32
1614.25:197:33
1714.35:187:34
1814.35:177:35
1914.35:167:36
2014.45:167:37
2114.45:157:38
2214.45:147:39
2314.45:137:40
2414.55:127:41
2514.55:127:42
2614.55:117:42
2714.55:107:43
2814.65:107:44
2914.65:097:45
3014.65:097:46
3114.65:087:47

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 1.55 kWh/m² to a high of 6.17 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
15.3Bright
25.3Bright
35.3Bright
45.4Bright
55.4Bright
65.4Bright
75.4Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.5Bright
135.5Bright
145.6Bright
155.6Bright
165.6Bright
175.7Bright
185.7Bright
195.7Bright
205.7Bright
215.8Bright
225.8Bright
235.8Bright
245.8Bright
255.9Bright
265.9Bright
275.9Bright
285.9Bright
296.0Bright
306.0Bright
316.0Bright
Planning a trip in May

Is May a good time to visit Mount Vernon?

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

5.9
Sightseeing
5th-best month of the year
3.7
Beach & pool
5th-best month of the year

May is a reasonable time to visit Mount Vernon for sightseeing.

What to pack for Mount Vernon in May

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

In May, Mount Vernon sees daytime highs around 70°F and nights near 52°F. Worth packing: rain gear and sun protection. About 14 days see rain.

rain gearsun protection

UV index in Mount Vernon 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 Mount Vernon peaks around June 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 20UV 9Dec 23UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun10Very high
Jul9Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov3Moderate
Dec2Low

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

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1216 µg/m³Oct 247 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar11Good
Apr11Good
May14Moderate
Jun15Moderate
Jul16Moderate
Aug14Moderate
Sep11Good
Oct7Good
Nov7Good
Dec8Good
Location & terrain

Where is Mount Vernon?

Mount Vernon sits at 40.4°N, 82.5°W, 1,001 ft above sea level, in United States. The nearest listed city is Newark, 24 mi away.

Topography around Mount Vernon

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

Within 2 miles, the terrain around Mount Vernon has only modest variations in elevation — a maximum elevation change of 312 ft around an average of 1,040 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 597 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,033 ft.

The land around Mount Vernon is covered by trees (34%) and grassland (31%) within 2 miles, trees (38%), cropland (38%) and grassland (21%) within 10 miles, and trees (40%) and cropland (37%) within 50 miles.

2 miles
312 ft
10 miles
597 ft
50 miles
1,033 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Newark 24 mi · Mansfield 25 mi · Pataskala 29 mi · Westerville 30 mi · Delaware 31 mi · Gahanna 33 mi · Ashland 34 mi · Reynoldsburg 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 Mount Vernon (40.3934°, -82.4857°, elevation 1,001 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).