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The average temperature in Middelharnis over the whole year is 12°C. August is the hottest month, with highs of about 22°C; January is the coldest, with lows of about 4°C. The rainy (wet) season in Middelharnis runs from October to March, peaking in December with a 45% chance of rain on a given day. The dry season is April to September; June is the driest month, at 22%. Winds in Middelharnis are highest in February, averaging 6.4 m/s (23 km/h), and lightest in September, at 4.7 m/s (17 km/h). The prevailing wind is from the SW. The clearest skies in Middelharnis come in June, when the sky is typically 45% covered; December is the cloudiest month, at 73%.
| Month | High | Low | Feels like | Chance of rain | Cloud | Wind | Being outside | Sun | Walking |
|---|---|---|---|---|---|---|---|---|---|
| January | 6°C | 4°C | 0°C | 42% | 72% | 6.2 m/s | 0 | 0 | 6 |
| February | 7°C | 5°C | 1°C | 37% | 62% | 6.4 m/s | 0 | 0 | 16 |
| March | 10°C | 5°C | 4°C | 34% | 54% | 5.6 m/s | 2 | 0 | 30 |
| April | 13°C | 8°C | 8°C | 28% | 46% | 5.2 m/s | 12 | 0 | 54 |
| May | 17°C | 11°C | 13°C | 23% | 46% | 5.0 m/s | 34 | 2 | 73 |
| June | 20°C | 15°C | 17°C | 22% | 45% | 4.9 m/s | 64 | 11 | 72 |
| July | 21°C | 16°C | 19°C | 23% | 48% | 4.9 m/s | 71 | 10 | 70 |
| August | 22°C | 17°C | 19°C | 26% | 46% | 4.8 m/s | 73 | 15 | 66 |
| September | 19°C | 14°C | 16°C | 30% | 49% | 4.7 m/s | 59 | 7 | 73 |
| October | 15°C | 11°C | 11°C | 37% | 59% | 5.5 m/s | 21 | 0 | 70 |
| November | 10°C | 7°C | 5°C | 42% | 65% | 5.7 m/s | 1 | 0 | 35 |
| December | 7°C | 6°C | 2°C | 45% | 73% | 6.2 m/s | 0 | 0 | 13 |
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, Middelharnis has days of about 6°C at their warmest in January, its coolest month, and 22°C in August, its warmest; the coolest hours of the day run from 4°C to 17°C through the year, and the average temperature over the year is 12°C around the clock. Rain is most likely around December and least likely around June. 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 Middelharnis has typical daily highs of about 7°C and lows of about 5°C, with a 41% chance of rain on a given day.
Spring in Middelharnis has typical daily highs of about 13°C and lows of about 8°C, with a 28% chance of rain on a given day.
Summer in Middelharnis has typical daily highs of about 21°C and lows of about 16°C, with a 24% chance of rain on a given day.
Autumn in Middelharnis has typical daily highs of about 15°C and lows of about 11°C, with a 36% chance of rain on a given day.
The rainy (wet) season in Middelharnis runs from October to March, peaking in December with a 45% chance of rain on a given day. The dry season is April to September; June is the driest month, at 22%.
Winds in Middelharnis are highest in February, averaging 6.4 m/s (23 km/h), and lightest in September, at 4.7 m/s (17 km/h). The prevailing wind is from the SW.
The average temperature in Middelharnis over the whole year is 12°C. August is the hottest month, with highs of about 22°C; January is the coldest, with lows of about 4°C.