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The average temperature in Jonava over the whole year is 9°C. August is the hottest month, with highs of about 22°C; January is the coldest, with lows of about -2°C. Jonava has no sharply defined rainy season: the chance of rain on a given day runs from 15% in September, the driest month, to 25% in July, the wettest. Winds in Jonava are highest in January, averaging 3.7 m/s (13 km/h), and lightest in August, at 2.4 m/s (9 km/h). The prevailing wind is from the SW. The clearest skies in Jonava come in June, when the sky is typically 57% covered; December is the cloudiest month, at 91%.
| Month | High | Low | Feels like | Chance of rain | Cloud | Wind | Being outside | Sun | Walking |
|---|---|---|---|---|---|---|---|---|---|
| January | -1°C | -2°C | -6°C | 18% | 88% | 3.7 m/s | 0 | 0 | 1 |
| February | 1°C | -2°C | -5°C | 19% | 80% | 3.5 m/s | 0 | 0 | 1 |
| March | 5°C | -0°C | -0°C | 16% | 70% | 3.3 m/s | 0 | 0 | 10 |
| April | 11°C | 4°C | 6°C | 20% | 66% | 3.5 m/s | 9 | 0 | 41 |
| May | 16°C | 8°C | 12°C | 20% | 59% | 2.9 m/s | 36 | 2 | 69 |
| June | 21°C | 14°C | 19°C | 23% | 57% | 2.8 m/s | 69 | 16 | 67 |
| July | 22°C | 15°C | 20°C | 25% | 61% | 2.7 m/s | 76 | 20 | 62 |
| August | 22°C | 15°C | 21°C | 21% | 58% | 2.4 m/s | 78 | 21 | 63 |
| September | 17°C | 10°C | 15°C | 15% | 58% | 2.7 m/s | 51 | 3 | 78 |
| October | 10°C | 7°C | 7°C | 21% | 75% | 3.3 m/s | 5 | 0 | 51 |
| November | 4°C | 3°C | -0°C | 17% | 89% | 3.3 m/s | 0 | 0 | 11 |
| December | 0°C | -1°C | -5°C | 17% | 91% | 3.6 m/s | 0 | 0 | 1 |
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, Jonava has days of about -1°C at their warmest in January, its coolest month, and 22°C in August, its warmest; the coolest hours of the day run from -2°C to 15°C through the year, and the average temperature over the year is 9°C around the clock. Rain is most likely around July 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 Jonava has typical daily highs of about -0°C and lows of about -1°C, with a 18% chance of rain on a given day.
Spring in Jonava has typical daily highs of about 11°C and lows of about 4°C, with a 19% chance of rain on a given day.
Summer in Jonava has typical daily highs of about 22°C and lows of about 15°C, with a 23% chance of rain on a given day.
Autumn in Jonava has typical daily highs of about 11°C and lows of about 6°C, with a 18% chance of rain on a given day.
Jonava has no sharply defined rainy season: the chance of rain on a given day runs from 15% in September, the driest month, to 25% in July, the wettest.
Winds in Jonava are highest in January, averaging 3.7 m/s (13 km/h), and lightest in August, at 2.4 m/s (9 km/h). The prevailing wind is from the SW.
The average temperature in Jonava over the whole year is 9°C. August is the hottest month, with highs of about 22°C; January is the coldest, with lows of about -2°C.