Category Archives: Earth

Climate update

I’ve updated the climate pages with the latest data from the BOM.

If this summer felt long and hot to you then you’re right. The graph shows the average summer high is the hottest it’s been for 5 years. Looking at the 1 year averages the cooling trend that started in 2014 has reversed and we’re warming again. As always the longer term 30 year averages still show a very clear and consistent warming trend. The warming acceleration that started in 2013 is continuing.

Still no update from the BOM on sea level measurements, we’re stuck at the end of 2014 with that.

Rainfall data shows no clear long term trend, we’re pretty much smack in the middle of the historical long term measurements.

Sydney Climate Update

We’re just coming out of what felt like a freezing cold winter, it seemed like it was bitter and dark for so long. But when it comes to accuracy human skin and brain cells are really terrible at remembering and comparing the weather. Lucky for us we have the data!

Cold and wet at the Mt Tomah botanical gardens

The BOM have updated their long term climate data again. This time we’re in for a treat, we have updates to temperature, sea level and rainfall.

Looking at the maximum and minimum monthly temperature averages we have indeed had some cold months. The July average minimum of 8C is the coldest since 2002 when it was 7.9C, and looking back 30 years only 1995 was colder. The mean maximum for July was cool but many years have been cooler over the past 30 years. 2013 and 2014 were quite warm by comparison though, maybe that’s why it felt cold this year. As we’ve only got up to July we can’t compare moving averages yet.

For sea levels the short term averages actually show a drop in 2014. The 5yr and above moving averages still show an unmistakable upward trend.

Rainfall averages are up, I don’t recall it being particularly wet though, so much for memory.

Climate data update

I’ve updated the Sydney temperature and rainfall pages with the latest data from the BOM, we’re pretty much right up to date now, thanks BOM. Something has happened to their sea level pages though, their Fort Denison measurements have not been updated since the end of 2012.

It’s the long term trends that are of most interest so nothing mind blowing in these updates, temperature continues to rise on almost all average time periods. I found it interesting that even after the “August of rain” most rainfall averages are still low when you look back over time.


The 2014 Annular Solar Eclipse

The 2014 annular solar eclipse was meant to be a rare one, occurring once every 73 years. It was going to be about 50% in Sydney, not total but still impressive to watch. I left the arc welding helmet at home with instructions for the kids on how and when to use it to look at the sun. The goggles came with me to work.

It was clear all day, but the clouds gathered near the horizon just as the sun dipped and the eclipse was due to start.


The 2014 Annular Solar eclipse as viewed from Sydney. Just clouds.
Vikram and I climbed to the carpark roof to view the eclipse, but it was behind the clouds.