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The average temperature in Arco over the whole year is 11°C. July is the hottest month, with highs of about 25°C; January is the coldest, with lows of about -2°C. Arco has no sharply defined rainy season: the chance of rain on a given day runs from 25% in September, the driest month, to 44% in May, the wettest. Winds in Arco are highest in April, averaging 2.7 m/s (10 km/h), and lightest in September, at 2.1 m/s (8 km/h). The prevailing wind is from the W. The clearest skies in Arco come in January, when the sky is typically 50% covered; May is the cloudiest month, at 66%.
| Month | High | Low | Feels like | Chance of rain | Cloud | Wind | Being outside | Sun | Walking |
|---|---|---|---|---|---|---|---|---|---|
| January | 2°C | -2°C | -2°C | 37% | 50% | 2.4 m/s | 0 | 0 | 8 |
| February | 6°C | 1°C | 1°C | 29% | 56% | 2.4 m/s | 1 | 0 | 27 |
| March | 10°C | 3°C | 6°C | 31% | 54% | 2.5 m/s | 11 | 0 | 53 |
| April | 14°C | 7°C | 10°C | 38% | 59% | 2.7 m/s | 39 | 2 | 59 |
| May | 17°C | 10°C | 15°C | 44% | 66% | 2.7 m/s | 52 | 11 | 56 |
| June | 23°C | 16°C | 22°C | 36% | 53% | 2.5 m/s | 47 | 42 | 34 |
| July | 25°C | 17°C | 24°C | 32% | 50% | 2.5 m/s | 31 | 51 | 26 |
| August | 24°C | 17°C | 24°C | 36% | 50% | 2.4 m/s | 33 | 49 | 27 |
| September | 20°C | 13°C | 19°C | 25% | 55% | 2.1 m/s | 55 | 31 | 45 |
| October | 14°C | 9°C | 12°C | 40% | 56% | 2.1 m/s | 45 | 2 | 65 |
| November | 8°C | 4°C | 5°C | 26% | 59% | 2.2 m/s | 7 | 0 | 43 |
| December | 4°C | -0°C | -0°C | 26% | 53% | 2.2 m/s | 0 | 0 | 12 |
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Year round, Arco has days of about 2°C at their warmest in January, its coolest month, and 25°C in July, its warmest; the coolest hours of the day run from -2°C to 17°C through the year, and the average temperature over the year is 11°C around the clock. Rain is most likely around May and least likely around September. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Winter in Arco has typical daily highs of about 4°C and lows of about -0°C, with a 31% chance of rain on a given day.
Spring in Arco has typical daily highs of about 13°C and lows of about 6°C, with a 38% chance of rain on a given day.
Summer in Arco has typical daily highs of about 24°C and lows of about 16°C, with a 34% chance of rain on a given day.
Autumn in Arco has typical daily highs of about 14°C and lows of about 8°C, with a 30% chance of rain on a given day.
Arco has no sharply defined rainy season: the chance of rain on a given day runs from 25% in September, the driest month, to 44% in May, the wettest.
Winds in Arco are highest in April, averaging 2.7 m/s (10 km/h), and lightest in September, at 2.1 m/s (8 km/h). The prevailing wind is from the W.
The average temperature in Arco over the whole year is 11°C. July is the hottest month, with highs of about 25°C; January is the coldest, with lows of about -2°C.