Mosman weather in December
In December, Mosman sees average daytime highs of 23°C and overnight lows near 19°C, with 60 mm of rain across 8.6 wet days and about 14.2 hours of daylight. It is the 4th-warmest and 8th-wettest month of the year here.
Day-to-day highs hold fairly steady near 23°C through the month. The sky is clear or mostly clear about 38% of the time in December, and the air most often feels humid.
Daylight stretches from about 14 h 06 min at the start of December to 14 h 12 min by month's end. Set against the rest of the year, December is Mosman's 10th-clearest and 5th-windiest month. For the whole year in context, see Mosman's year-round climate.
- Daytime high
- 23°
- 4th warmest
- Overnight low
- 19°
- 9th coldest
- Rainfall
- 60 mm
- 8.6 wet days
- Daylight
- 14 h 12 min
- 5:44 AM – 7:58 PM
- Cloud cover
- 53%
- 10th clearest
- Wind
- 18 km/h
- 5th windiest
- Solar energy
- 6.64 kWh/m²
- Travel score
- 7.2
- out of 10
Mosman is suburb of Sydney, New South Wales, Australia.
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in December
Day-to-day highs hold fairly steady near 23°C through the month.
A typical December day in Mosman reaches about 23°C in the afternoon and slips back to 19°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 26°C. Set against its neighbours, December runs about 2°C warmer than November and about 1°C cooler than January.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 22 | 22 | 22 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 24 | 24 | 24 | 24 | 24 |
| Avg low (°C) | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 20 | 20 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 22 | 18 |
| 2 | 22 | 18 |
| 3 | 22 | 18 |
| 4 | 23 | 18 |
| 5 | 23 | 18 |
| 6 | 23 | 18 |
| 7 | 23 | 18 |
| 8 | 23 | 18 |
| 9 | 23 | 18 |
| 10 | 23 | 18 |
| 11 | 23 | 19 |
| 12 | 23 | 19 |
| 13 | 23 | 19 |
| 14 | 23 | 19 |
| 15 | 23 | 19 |
| 16 | 23 | 19 |
| 17 | 23 | 19 |
| 18 | 23 | 19 |
| 19 | 23 | 19 |
| 20 | 23 | 19 |
| 21 | 23 | 19 |
| 22 | 23 | 19 |
| 23 | 23 | 19 |
| 24 | 23 | 19 |
| 25 | 23 | 19 |
| 26 | 23 | 19 |
| 27 | 24 | 19 |
| 28 | 24 | 19 |
| 29 | 24 | 19 |
| 30 | 24 | 20 |
| 31 | 24 | 20 |
Mosman weather by month
How December compares with the rest of the year at a glance. December is the 4th-warmest and 8th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 24° / 20° | 72 | 9.3 | 14 | 7.2 |
| Feb | 24° / 20° | 93 | 10.3 | 13.3 | 6.9 |
| Mar | 23° / 19° | 82 | 11.6 | 12.3 | 6.8 |
| Apr | 21° / 17° | 77 | 10.5 | 11.2 | 6.7 |
| May | 19° / 14° | 79 | 9.7 | 10.3 | 6.4 |
| Jun | 17° / 12° | 97 | 10.3 | 9.8 | 5.6 |
| Jul | 16° / 11° | 56 | 7.7 | 10 | 5.8 |
| Aug | 17° / 11° | 53 | 6.6 | 10.7 | 6.4 |
| Sep | 19° / 13° | 50 | 6.7 | 11.8 | 6.9 |
| Oct | 20° / 15° | 59 | 8 | 12.9 | 6.8 |
| Nov | 21° / 17° | 72 | 9.1 | 13.8 | 6.8 |
| Dec | 23° / 19° | 60 | 8.6 | 14.2 | 7.2 |
Cloud cover in December
The sky is clear or mostly clear about 38% of the time in December.
Beyond those clear spells, partly cloudy skies cover about 17% of December, with mostly cloudy or overcast conditions the remaining 45%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 55 | 54 | 54 | 54 | 54 | 53 | 53 | 54 | 54 | 54 | 55 | 55 | 55 | 55 | 55 | 55 | 55 | 55 | 55 | 56 | 56 | 56 | 57 | 57 | 57 | 56 | 57 | 57 | 57 | 57 | 57 |
| Cloudier (%) | 45 | 46 | 46 | 46 | 46 | 47 | 47 | 46 | 46 | 46 | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 44 | 44 | 44 | 43 | 43 | 43 | 44 | 43 | 43 | 43 | 43 | 43 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 55 | 45 |
| 2 | 54 | 46 |
| 3 | 54 | 46 |
| 4 | 54 | 46 |
| 5 | 54 | 46 |
| 6 | 53 | 47 |
| 7 | 53 | 47 |
| 8 | 54 | 46 |
| 9 | 54 | 46 |
| 10 | 54 | 46 |
| 11 | 55 | 45 |
| 12 | 55 | 45 |
| 13 | 55 | 45 |
| 14 | 55 | 45 |
| 15 | 55 | 45 |
| 16 | 55 | 45 |
| 17 | 55 | 45 |
| 18 | 55 | 45 |
| 19 | 55 | 45 |
| 20 | 56 | 44 |
| 21 | 56 | 44 |
| 22 | 56 | 44 |
| 23 | 57 | 43 |
| 24 | 57 | 43 |
| 25 | 57 | 43 |
| 26 | 56 | 44 |
| 27 | 57 | 43 |
| 28 | 57 | 43 |
| 29 | 57 | 43 |
| 30 | 57 | 43 |
| 31 | 57 | 43 |
Chance of precipitation in December
Mosman gets around 60 mm of rain over 8.6 wet days in December. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 28% and peaks near 29% on the wettest days.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 27 | 27 | 27 | 27 | 27 | 27 | 28 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 28 | 28 | 28 |
| Rain chance (%) | |
|---|---|
| 1 | 29 |
| 2 | 29 |
| 3 | 29 |
| 4 | 29 |
| 5 | 29 |
| 6 | 29 |
| 7 | 29 |
| 8 | 29 |
| 9 | 29 |
| 10 | 28 |
| 11 | 28 |
| 12 | 28 |
| 13 | 28 |
| 14 | 27 |
| 15 | 27 |
| 16 | 27 |
| 17 | 27 |
| 18 | 27 |
| 19 | 27 |
| 20 | 28 |
| 21 | 27 |
| 22 | 27 |
| 23 | 27 |
| 24 | 27 |
| 25 | 27 |
| 26 | 27 |
| 27 | 27 |
| 28 | 27 |
| 29 | 28 |
| 30 | 28 |
| 31 | 28 |
Humidity in December
Most of December feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, December lands in the humid band about 38% of days. Sticky, muggy-or-worse air turns up on roughly 21% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 23 | 23 | 22 | 22 | 21 | 21 | 20 | 19 | 19 | 18 | 17 | 17 | 16 | 16 | 15 | 15 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 12 | 12 | 12 | 11 | 11 | 11 | 10 | 10 |
| Comfortable (%) | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 26 | 26 | 25 | 25 | 24 | 24 | 24 | 23 | 23 | 22 | 22 | 21 | 21 | 21 | 20 | 20 | 20 | 19 |
| Humid (%) | 34 | 34 | 34 | 34 | 35 | 35 | 35 | 35 | 36 | 36 | 37 | 37 | 38 | 38 | 38 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 40 | 40 | 40 | 40 | 41 | 41 | 41 | 41 | 41 |
| Muggy (%) | 14 | 15 | 15 | 16 | 16 | 16 | 17 | 17 | 17 | 18 | 18 | 19 | 19 | 20 | 21 | 21 | 22 | 22 | 23 | 24 | 24 | 25 | 25 | 25 | 26 | 26 | 27 | 27 | 27 | 28 | 28 |
| Oppressive (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| 1 | 23 | 29 | 34 | 14 | 0 |
| 2 | 23 | 29 | 34 | 15 | 0 |
| 3 | 22 | 29 | 34 | 15 | 0 |
| 4 | 22 | 28 | 34 | 16 | 0 |
| 5 | 21 | 28 | 35 | 16 | 0 |
| 6 | 21 | 28 | 35 | 16 | 0 |
| 7 | 20 | 28 | 35 | 17 | 0 |
| 8 | 19 | 28 | 35 | 17 | 0 |
| 9 | 19 | 28 | 36 | 17 | 0 |
| 10 | 18 | 28 | 36 | 18 | 0 |
| 11 | 17 | 28 | 37 | 18 | 0 |
| 12 | 17 | 27 | 37 | 19 | 0 |
| 13 | 16 | 27 | 38 | 19 | 0 |
| 14 | 16 | 26 | 38 | 20 | 0 |
| 15 | 15 | 26 | 38 | 21 | 0 |
| 16 | 15 | 25 | 39 | 21 | 0 |
| 17 | 14 | 25 | 39 | 22 | 0 |
| 18 | 14 | 24 | 39 | 22 | 0 |
| 19 | 14 | 24 | 39 | 23 | 0 |
| 20 | 14 | 24 | 39 | 24 | 0 |
| 21 | 13 | 23 | 39 | 24 | 0 |
| 22 | 13 | 23 | 39 | 25 | 0 |
| 23 | 13 | 22 | 40 | 25 | 0 |
| 24 | 12 | 22 | 40 | 25 | 0 |
| 25 | 12 | 21 | 40 | 26 | 0 |
| 26 | 12 | 21 | 40 | 26 | 1 |
| 27 | 11 | 21 | 41 | 27 | 1 |
| 28 | 11 | 20 | 41 | 27 | 1 |
| 29 | 11 | 20 | 41 | 27 | 1 |
| 30 | 10 | 20 | 41 | 28 | 1 |
| 31 | 10 | 19 | 41 | 28 | 1 |
Wind in December
Winds average 18 km/h in December.
Across December, daily wind ranges from about 18 km/h on the calmest days to 18 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 18 | light breeze |
| 2 | 18 | light breeze |
| 3 | 18 | light breeze |
| 4 | 18 | light breeze |
| 5 | 18 | light breeze |
| 6 | 18 | light breeze |
| 7 | 18 | light breeze |
| 8 | 18 | light breeze |
| 9 | 18 | light breeze |
| 10 | 18 | light breeze |
| 11 | 18 | light breeze |
| 12 | 18 | light breeze |
| 13 | 18 | light breeze |
| 14 | 18 | light breeze |
| 15 | 18 | light breeze |
| 16 | 18 | light breeze |
| 17 | 18 | light breeze |
| 18 | 18 | light breeze |
| 19 | 18 | light breeze |
| 20 | 18 | light breeze |
| 21 | 18 | light breeze |
| 22 | 18 | light breeze |
| 23 | 18 | light breeze |
| 24 | 18 | light breeze |
| 25 | 18 | light breeze |
| 26 | 18 | light breeze |
| 27 | 18 | light breeze |
| 28 | 18 | light breeze |
| 29 | 18 | light breeze |
| 30 | 18 | light breeze |
| 31 | 18 | light breeze |
Sunrise & sunset in December
Daylight runs from about 14 h 06 min at the start of December to 14 h 12 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 6 minutes over December. Sunrise moves from 5:42 AM to 5:52 AM, and sunset from 7:47 PM to 8:05 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 14.1 | 14.1 | 14.1 | 14.1 | 14.1 | 14.2 | 14.2 | 14.2 | 14.2 | 14.2 | 14.2 | 14.2 | 14.2 | 14.2 | 14.2 | 14.2 | 14.2 | 14.2 | 14.2 | 14.3 | 14.3 | 14.3 | 14.3 | 14.3 | 14.2 | 14.2 | 14.2 | 14.2 | 14.2 | 14.2 | 14.2 |
| Sunrise (AM) | 5:42 | 5:42 | 5:42 | 5:42 | 5:42 | 5:42 | 5:42 | 5:42 | 5:42 | 5:43 | 5:43 | 5:43 | 5:43 | 5:43 | 5:44 | 5:44 | 5:44 | 5:45 | 5:45 | 5:46 | 5:46 | 5:46 | 5:47 | 5:47 | 5:48 | 5:48 | 5:49 | 5:50 | 5:50 | 5:51 | 5:52 |
| Sunset (PM) | 7:47 | 7:48 | 7:49 | 7:50 | 7:51 | 7:51 | 7:52 | 7:53 | 7:54 | 7:54 | 7:55 | 7:56 | 7:56 | 7:57 | 7:58 | 7:58 | 7:59 | 8:00 | 8:00 | 8:01 | 8:01 | 8:02 | 8:02 | 8:03 | 8:03 | 8:03 | 8:04 | 8:04 | 8:04 | 8:05 | 8:05 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 14.1 | 5:42 | 7:47 |
| 2 | 14.1 | 5:42 | 7:48 |
| 3 | 14.1 | 5:42 | 7:49 |
| 4 | 14.1 | 5:42 | 7:50 |
| 5 | 14.1 | 5:42 | 7:51 |
| 6 | 14.2 | 5:42 | 7:51 |
| 7 | 14.2 | 5:42 | 7:52 |
| 8 | 14.2 | 5:42 | 7:53 |
| 9 | 14.2 | 5:42 | 7:54 |
| 10 | 14.2 | 5:43 | 7:54 |
| 11 | 14.2 | 5:43 | 7:55 |
| 12 | 14.2 | 5:43 | 7:56 |
| 13 | 14.2 | 5:43 | 7:56 |
| 14 | 14.2 | 5:43 | 7:57 |
| 15 | 14.2 | 5:44 | 7:58 |
| 16 | 14.2 | 5:44 | 7:58 |
| 17 | 14.2 | 5:44 | 7:59 |
| 18 | 14.2 | 5:45 | 8:00 |
| 19 | 14.2 | 5:45 | 8:00 |
| 20 | 14.3 | 5:46 | 8:01 |
| 21 | 14.3 | 5:46 | 8:01 |
| 22 | 14.3 | 5:46 | 8:02 |
| 23 | 14.3 | 5:47 | 8:02 |
| 24 | 14.3 | 5:47 | 8:03 |
| 25 | 14.2 | 5:48 | 8:03 |
| 26 | 14.2 | 5:48 | 8:03 |
| 27 | 14.2 | 5:49 | 8:04 |
| 28 | 14.2 | 5:50 | 8:04 |
| 29 | 14.2 | 5:50 | 8:04 |
| 30 | 14.2 | 5:51 | 8:05 |
| 31 | 14.2 | 5:52 | 8:05 |
Solar energy in December
Average shortwave solar energy reaching the ground each day in December, about 6.64 kWh/m² — the sunniest month for solar.
For context, solar energy here swings from a low near 2.45 kWh/m² to a high of 6.64 kWh/m² in January across the year — December's 6.64 kWh/m² sits near the top of that range.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.7 | 6.7 | 6.7 | 6.7 | 6.7 | 6.8 | 6.8 | 6.8 | 6.9 | 6.9 | 6.9 | 7.0 | 7.0 | 7.0 | 7.0 | 7.0 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 6.6 | Intense |
| 2 | 6.6 | Intense |
| 3 | 6.6 | Intense |
| 4 | 6.6 | Intense |
| 5 | 6.6 | Intense |
| 6 | 6.6 | Intense |
| 7 | 6.6 | Intense |
| 8 | 6.6 | Intense |
| 9 | 6.6 | Intense |
| 10 | 6.6 | Intense |
| 11 | 6.6 | Intense |
| 12 | 6.6 | Intense |
| 13 | 6.6 | Intense |
| 14 | 6.6 | Intense |
| 15 | 6.6 | Intense |
| 16 | 6.7 | Intense |
| 17 | 6.7 | Intense |
| 18 | 6.7 | Intense |
| 19 | 6.7 | Intense |
| 20 | 6.7 | Intense |
| 21 | 6.8 | Intense |
| 22 | 6.8 | Intense |
| 23 | 6.8 | Intense |
| 24 | 6.9 | Intense |
| 25 | 6.9 | Intense |
| 26 | 6.9 | Intense |
| 27 | 7.0 | Intense |
| 28 | 7.0 | Intense |
| 29 | 7.0 | Intense |
| 30 | 7.0 | Intense |
| 31 | 7.0 | Intense |
Hazard calendar for Mosman
In December, Mosman sits inside its cyclone season. The full year is below, with each hazard's peak months called out.
Mosman sits in the South Indian Ocean cyclone belt; the season peaks January–March.
Is December a good time to visit Mosman?
Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
December is one of the better times to visit Mosman for general sightseeing.
What to pack for Mosman in December
From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In December, Mosman sees daytime highs around 23°C and nights near 19°C. Pack sun protection. Worth having: light clothes and rain gear. About 9 days see rain.
Sea temperature near Mosman in December
The nearest coast averages about 21°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 13 km away) is warmest in February at about 23°C and coldest in August near 18°C.
It's comfortable for a long swim from Nov 13 to Jun 7 — about 6.8 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 23 | 23 | 23 | 22 | 21 | 20 | 19 | 18 | 18 | 19 | 20 | 21 |
| Comfort | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Cool | Cool | Cool | Cool | Cool | Refreshing | Refreshing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 23 | Refreshing |
| Feb | 23 | Refreshing |
| Mar | 23 | Refreshing |
| Apr | 22 | Refreshing |
| May | 21 | Refreshing |
| Jun | 20 | Cool |
| Jul | 19 | Cool |
| Aug | 18 | Cool |
| Sep | 18 | Cool |
| Oct | 19 | Cool |
| Nov | 20 | Refreshing |
| Dec | 21 | Refreshing |
UV index in Mosman in December
Clear-sky midday UV in December peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Mosman peaks around January 15 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 12 | 12 | 9 | 6 | 4 | 2 | 3 | 4 | 5 | 8 | 10 | 12 |
| Level | Extreme | Extreme | Very high | High | Moderate | Moderate | Moderate | Moderate | High | Very high | Very high | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 12 | Extreme |
| Feb | 12 | Extreme |
| Mar | 9 | Very high |
| Apr | 6 | High |
| May | 4 | Moderate |
| Jun | 2 | Moderate |
| Jul | 3 | Moderate |
| Aug | 4 | Moderate |
| Sep | 5 | High |
| Oct | 8 | Very high |
| Nov | 10 | Very high |
| Dec | 12 | Extreme |
Where is Mosman?
Mosman sits at 33.8°S, 151.2°E, 24 m above sea level, in Australia. The nearest listed city is Sydney Central Business District, 4.0 km away.
Topography around Mosman
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Mosman.
Within 3 km, the terrain around Mosman has only modest variations in elevation — a maximum elevation change of 104 m around an average of 26 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 232 m; within 80 km, large variations in elevation — a maximum elevation change of 961 m.
The land around Mosman is covered by water (50%), artificial surfaces (27%) and trees (20%) within 3 km, water (42%), trees (27%) and artificial surfaces (26%) within 16 km, and trees (49%) and water (35%) within 80 km.
Australia travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type I
- 230 V · 50 Hz
- Prices
- ≈ 90% of US
- price level, 2025
- GDP per capita
- $65,130
- 2025
- Happiness
- 6.9 / 10
- World Happiness, 2025
- Homicide rate
- 0.9
- per 100k, 2023
- Road deaths
- 4.9
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Mosman (-33.839°, 151.2396°, elevation 24 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).