June 2025 Weather report

 A cold and damp month overall.  At least it wasn't windy!

Rainfall

 As with every other month this year we have exceeded the median fall for the month!  For June we managed 95.4 mm, 143% of the median fall for the month.  By the end of the month our fall for the year to date is  728.6 mm or 159.8% of the median fall for that period.  (Another way of looking at that is that we have already recorded more than the annual falls for 6 of the 47 years for which I have records.)  Here is a comparison of this year, last year and the median fall or the 7 years from my Weather Station (WS) at Angophora Drive.

Most of the rain came in the first half of the month.  The very small amounts later in the month are effectively dew condensing out of very humid dawn skies.

My pro-rata estimates of the annual fall for 2025 seem to be settling down around 1400 mm for the year in total.  If we achieve anything close to that it will be in the heaviest 5 annual falls since 1975 (including falls at the BoM Airport gauge.)

Temperatures

The anomaly ended the month at -0.53oC which is the first negative value since January this year.  The start of the year was particularly chilly.

My time series of values of the anomaly is very variable, but the moving average, which removes seasonality, shows a plateau effect, at a fairly high level, over the last 2 years

Looking at the daily extreme temperatures  shows the maxima to have fluctuated around the mean values while the minima have more frequently been low.

Minimum temperatures

The average minimum temperature at my WS was 6.23oC and the coldest record here was 2.4oC while the Airport recorded a lowest reading of 2oC - a frost - on 30 June.  The average was the lowest since I started my WS in 2019.  The extreme temperatures were definitely cold, ith 9 minima significantly below the longer term mean minimum (one very significantly below) and only 2 significantly above the longer term mean,

Maximum temperatures

The average maximum temperature at my WS was 19.96oC - very close to the longer term mean - and the warmest record here was 20.6oC on the 24th - very significantly above the longer term monthly average. Overall, maximums were about normal, with 4 records significantly above average and 3 significantly below.

Humidity

The relative humidity was above average for both standard times but the afternoon reading was below last years value - not surprising in view of the rainfall last June!

The daily humidity chart shows an overall high set of readings - with afternoon levels closer than usual to the morning readings.  

The drop in humidity on the 24th is interesting.  Plotting hourly humidity and maximum temperature shows them moving in very different directions.  Both are possibly an effect of the strong NNWly winds recorded on the day.

Wind

The average wind run for the month as a whole was very low - the average of 60km being close to 20 km less than the runs in the other 6 Junes for which I have records.  In contrast the run of 243km on the 24th was longest run I have recorded in a June day.

Tempest recording

A friend whose WS is connected to the Tempest network has given me access to that system.  It includes some additional variables to those from my WS.  

The system recorded 16 lightning strikes (within a 40km radius of Mallacoota which ).  I only have records for 34 months so can't say much about that, other than noting that cooler months are less prone to lightning strikes than summer (several Summer months have over 1000 strikes recorded and February 2025 recorded close to 7,000 strikes in that area).

The system also records solar radiation in a variety of ways.  The following chart shows that recent experience is for relatively low levels of radiation as would be expected given our rain (which requires cloud!)  I shall do a separate post with more details about my interpretation of these data.