June 2021 was a month of two halves

Weather news

Stray barley plant in wheat field, sunny June day, north of Epping (photo: Roger Emmens)

June 2021 was a month of two halves!

June really was a month of two halves – the first sixteen days were completely different from the last fourteen! We started off with the first bout of really warm weather of the year so far, with the first sixteen days including nine where the temperature was above 25 °C, rising to 29.6 °C on 16th; but then the temperatures fell off a cliff, so to speak, and the remainder of the month was cool, only two days reached 22 °C. So it was a bit of a surprise that June overall was an above average month in terms of temperature: the mean for the month of 17.2 °C was second warmest in our 37 years of records.

But it was certainly a wet month. Our 91.6 mm of rainfall made it our fifth wettest June, more than 67% above average. It rained on 16 days – only in 8 years of our records has it rained on more days – and the maximum of 32.6 mm, or more than an inch and a quarter, came on the 18th courtesy of the breakdown of the previous warm weather.

The sunshine also reflected the schizophrenic nature of the month: the first sixteen days yielded 137.5 hours, more than 8½ hours a day on average, but the last fourteen only gave us 46.5, just over 3¼ hours a day.

At least the winds were relatively light – the overall average wind speed across the month was just 1.9 mph, the commonest wind direction was NW and the highest gust of the month was 21 mph (force 5) from the NE on the 18th, associated with the heavy rain on that day.

MeasureUnitMinimumAverageMaximumAverage minAverage maxTotal
Relative humidity%227898
Temperature°C6.717.229.612.722.2
Wind source (most common/highest gust)SectorNWNE
Wind high gustmph1.92112.6
Rain daily accumulationmm3.032.691.6
Barometric pressurehPa1008.71019.41029.3
Solar irradiance during daylightW/m²2691146764
SunshineHours6.111.0184

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