January 2024 Summary

Perth January summary (Mid Summer)

Max monthly temp: 41.9C
Min monthly temp: 15.9C

Mean Max temp: 32.1C (+0.8C)
Mean Min temp: 18.8C(+0.4C)

Rainfall mm: 1.8mm (-11.6mm)
Rainy days >1mm: 1 (0)

Sunshine hours: 383.1 hours (+26.6 hours)
Relative afternoon humidity: 42% (+3%)

Overall a bit warmer than average month for Perth and a bit sunnier aswell. Little to no rainfall either which is typical of summer months. The mean temperature was really carried higher by the few brutally hot days we had. Apart from that it was mostly a typical summer month in Perth. Sunny and hot

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3.1F cooler than normal and 2.14" wetter than normal. Coolest January since 2018. The first two weeks were fairly typical. Then a strong cold snap mid-month with some wintry precip (mostly sleet & freezing rain) and coldest low since Feb 2021. Warmed up the fourth week of the month with quite a bit of rainfall.

Days with freezing min temps: 13
Days with freezing max temps: 2
Days with thunder: 5




Data for my PWS (rainfall data is inaccurate because gauge was clogged up during heavy rain late in the month). I had 9.42" in my manual CoCoRaHS gauge. 

Portage, WI in January!

Northern Territory in January 2024
( source: BoM )
Rainfall:
The arrival of the monsoon at Darwin on 10 January led to heavy rainfall and flooding throughout the month.
Across the NT, average rainfall was 232.78 mm, which was 90.2% above average (based on 1961–1990), making it the fourth-wettest January on record (since 1900).
Rainfall was above to very much above average for the northern two-thirds of the NT and the highest on record for much of the Gregory district.
Several sites had their highest January daily rainfall on record, including Port Keats Airport, which recorded 334.8mm on the 15th, the highest on record at the site for any month.
Many sites had their highest total January rainfall on record or highest total January rainfall for at least 20 years.

Temperature:
The mean temperature across the NT was 0.81 °C above the long-term average (based on 1961–1990)
The mean maximum temperature across the NT was 0.11 °C above the long-term (1961–1990) average.
Maximum temperatures were above to very much above average across the southern NT, and much of the Arnhem district extending around the Gulf of Carpentaria coast.
A few sites had their highest January temperature on record.
Delamere Weapons Range had its coldest January day (lowest maximum temperature) on record on the 17th.
The mean minimum temperature was 1.51 °C above the long-term average, the fourth-highest on record.
Minimum temperatures were above to very much above average across almost all of the NT, with highest on record minimum temperatures in areas of the Tanami and Carpentaria districts.
Several sites had their warmest January night (highest daily minimum temperature) on record.
Some sites had their highest January mean daily minimum temperature on record.

Darwin Airport:
Total rainfall for Darwin Airport was 531.6 mm, which is 123% of the long-term average of 431.0 mm.
The mean daily maximum temperature for Darwin Airport was 31.6 °C, which is 0.2 °C below the long-term average of 31.8 °C.
The warmest day was 35.6 °C on the 2nd, and the coolest day was on the 25th when the temperature reached 28.2 °C.
The mean daily minimum temperature for Darwin Airport was 25.6 °C, which is 0.7 °C above the long-term average of 24.9 °C.
The coldest morning was 22.6 °C on the 30th, and the warmest morning was on the 1st when the minimum temperature was 29.9 °C.

Bangkok, Bang Na site
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Highs

Max: 36.0 C
Mean: 33.7 C
Min: 29.6 C

Lows

Max: 26.7 C
Mean: 24.7 C
Min: 23.3 C

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No rain was recorded at this site (although I saw a few spots a couple of times). It was significantly warmer than average with long periods of high dewpoints.

January here started wet, the second & third weeks we had a cold snap with the coldest temperature recorded in this location for a few years & also a dusting of snow on one day. Most of the cold days were dry & sunny so sunshine came in above average. The last week saw milder temperatures & a little rain. 

Stats from my PWS

Av.Max 7.7C (-0.6C*)
Av.Min  2.6C (-0.2C*)
Mean    5.2C (-0.4C*)

Highest Max 12.2C (2nd)
Lowest Min   -5.9C (16th)
Lowest Max    2.6C (17th)
Highest Min    9.0C (2nd)

Rainfall 104.9mm (124%*)
Days with Rain 15
Days with >1.0mm 9
Days with Snow 1

Sunshine 103.9hrs (160%*)

Max/Min UV 1

Max Sea Temp 10.6C 
Min Sea Temp    7.7C
Mean Sea Temp 9.0C

*against Thorney Island 1991-2020 averages 

A winter month that ended up being around average, and that is a good thing after having many blowtorch winter months during these past few years.
We've had only one snowfall this month, with 12.5 cm/5 in of snow - not really impressive, but that's more than we got in all of 2023, and we rarely get over 10 cm of snow these years.
It also had a record low of -11.5C, a temp that we haven't had since 2018, and it was refreshing to see some proper winter temps.
It was also sunnier than average. However, the sunshine wasn't distributed equally - 38 hrs till the 19th, and the last 12 days brought clearer weather that bumped up the sun figures.
All in all a good month in my eyes, considering that our winters are on a strong warming trend.

Also, it's interesting to see how your geographic position influences the climate.
Split is 260 km south of Zagreb, and one look at the climate tables reveals how significant the effects of the Mediterranean Sea are.