The Frontier Gazette & Almanack
“Fair Warning for Every Town Under the Sky” · Est. 1881
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Onex Weather in May

Onex in May

The short of it: Onex in May averages a high of 20 °C (69 °F) and a low of 9 °C (48 °F), with 75 mm (3.0 in) of rain and about 14 h 57 min of daylight. Rated 3 of 5 for a visit; the best months are August and April. Source: TerraClimate climate normals, 1991–2020.

Average high 20° · low 9° · rain 75 mm · daylight 14 h 57 min

✦✦✦ Fair for a visit · best months: August & April

Thirty years of records give Onex an average May high of 20°, a low of 9° and some 75 mm of rain. Much like April: highs about 20°, nights near 9°. Easy travelling weather. Wet spells are common — about 75 mm, the 7th wettest month.

The sun is up for about 14 h 57 min in mid-May, 88 minutes more than a month before.

For the traveller: pack light clothes and a jacket for the evening, and an oilskin besides. The Almanac rates May 3 of 5 for a visit; the finest months here are August and April.

Against its neighbours, Onex runs warmer than most and wetter than most in May. Lancy, 1 km to the NE, sees much the same highs.

May in Onex, by the numbers

Warmth rank
5th warmest of 12
Rain rank
7th wettest of 12
Versus April
4° warmer, 16 mm more rain
Versus June
4° colder
Day–night spread
11°
Snow season
Jan–Feb
Daylight, mid-month
14 h 57 min
Average wind
9 km/h

Neighbouring Towns

May averages · distance by the crow’s flight
TownDistanceHighLowRain
LancyGeneva1 km NE20°9°75 mm
Plan-les-OuatesGeneva2 km SSE20°9°75 mm
BernexGeneva2 km WSW20°9°76 mm
CarougeGeneva3 km E20°9°73 mm
GenevaGeneva4 km ENE20°9°73 mm
VernierGeneva4 km NNW20°9°77 mm
Saint-Julien-en-GenevoisAuvergne-Rhône-Alpes5 km SSW20°9°76 mm
Le Grand-SaconnexGeneva6 km NNE20°9°77 mm

The Almanac · Onex Month by Month

Climate normals 1991–2020 · pick a month
PrecipitationAverage highAverage low
Fair
The Almanac Speaks
May
✦✦✦✦✦

Much like April: highs about 20°, nights near 9°. Easy travelling weather. Wet spells are common — about 75 mm, the 7th wettest month.

Climate of Onex by month
MonthHighLowRainWindDaylightVisit
January6°-1°76 mm8 km/h9 h 0 min✦
February8°-1°66 mm9 km/h10 h 16 min✦✦
March13°2°64 mm9 km/h11 h 46 min✦✦✦
April17°6°59 mm9 km/h13 h 30 min✦✦✦✦
May20°9°75 mm9 km/h14 h 57 min✦✦✦
June25°12°76 mm8 km/h15 h 45 min✦✦✦
July27°14°73 mm8 km/h15 h 25 min✦✦✦
August26°14°62 mm7 km/h14 h 9 min✦✦✦✦
September21°10°92 mm7 km/h12 h 28 min✦✦✦
October16°7°97 mm7 km/h10 h 49 min✦✦
November10°3°90 mm8 km/h9 h 21 min✦
December6°1°92 mm8 km/h8 h 38 min✦

Questions Readers Ask about Onex in May

Answered from the wire & the Almanac

What is the weather like in Onex in May?

Days average 20 °C (69 °F) and nights 9 °C (48 °F), with about 75 mm (3.0 in) of rain over the month. Much like April: highs about 20°, nights near 9°. Easy travelling weather. Wet spells are common — about 75 mm, the 7th wettest month.

Is May a good time to visit Onex?

The Almanac gives May 3 of 5 (fair). The best months are August and April.

How long are the days in Onex in May?

In mid-May the sun is up for about 14 h 57 min. The days are lengthening — from 8 h 38 min in December to 15 h 45 min in June.

Does it snow in Onex in May?

Hardly — May nights average 9 °C (48 °F), above freezing.

What should I pack for Onex in May?

Light clothes and a jacket for the evening, plus a good raincoat — it is a wet month.

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The Editor’s Remark

“Weather is the only news that never grows stale. Each morning the sky writes its own front page, and we at Wanted Weather are but its telegraph operators.”— J. Whitmore, Editor
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