Blue Mountains climate — normals and trends
Blue Mountains (Australia) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 12.7 °C and it receives 1,040 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is January (18.6 °C on average) and the coldest is July (6.3 °C). Rainfall peaks in February.
Blue Mountains averages 15 frost days, 13 hot days (≥ 30 °C) and 133 rainy days per year.
Blue Mountains has warmed by +1.1 °C between 1940 and 2025, or +0.13 °C per decade. This trend is statistically significant.
The hottest day of the period reached 38.8 °C (on 4 January 2020) and the coldest -3.7 °C (on 26 July 1986).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
Blue MountainsNew South Wales
- coords
- -33.71°, 150.33°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
12.7°C
Average daily high
18.3°C
Average daily low
8.0°C
Annual rainfall
1,040mm
Sunshine / day
9.9h
Mean relative humidity
75%
Average peak wind
14.2km/h
Seasonal range
12.3°C
Frost days (< 0 °C)
15 d/yr
Hot days (≥ 30 °C)
13 d/yr
Rainy days (≥ 1 mm)
133 d/yr
Annual snowfall
1.5 cm
Average feels-like high
17.1 °C
Average feels-like low
6.0 °C
Average peak gust
41.0 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
16.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.1 °C
since 1940
+0.1 °C per decade · r² = 0.39 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
38.8 °C
4 January 2020
Coldest day
-3.7 °C
26 July 1986
Wettest day
166 mm
9 February 2020
Windiest day
43.6 km/h
23 September 2009
Strongest gust
124.6 km/h
21 June 1975
Hottest feels-like
40.6 °C
31 January 2020
Coldest feels-like
-8.0 °C
26 July 1986
Snowiest day
7.1 cm
29 August 1963
Sunniest day
14.0 h
9 January 1940
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 24.4 °C | -0.3 °C | 156 mm | +26 mm |
| Feb | 24.8 °C | +1.0 °C | 126 mm | -18 mm |
| Mar | 22.9 °C | +1.1 °C | 132 mm | +12 mm |
| Apr | 20.0 °C | +1.5 °C | 92 mm | +16 mm |
| May | 15.6 °C | +0.8 °C | 140 mm | +84 mm |
| Jun | 12.6 °C | +0.8 °C | 15 mm | -42 mm |
| Jul | 11.6 °C | +0.3 °C | 73 mm | +35 mm |
| Aug | 12.6 °C | -0.3 °C | 125 mm | +71 mm |
| Sep | 18.3 °C | +2.2 °C | 59 mm | +4 mm |
| Oct | 21.8 °C | +2.7 °C | 43 mm | -43 mm |
| Nov | 22.9 °C | +1.3 °C | 60 mm | -47 mm |
| Dec | 25.5 °C | +1.7 °C | 90 mm | -27 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Blue Mountains?
Blue Mountains has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 12.7 °C and it receives 1,040 mm of precipitation per year.
What is the hottest day ever recorded in Blue Mountains?
The hottest day measured in Blue Mountains between 1940 and 2025 was 4 January 2020, reaching 38.8 °C.
What is the coldest day in Blue Mountains?
The coldest day measured in Blue Mountains between 1940 and 2025 was 26 July 1986, at -3.7 °C.
Does it snow in Blue Mountains?
Yes. Blue Mountains gets on average 1.5 cm of snow per year and has around 15 frost days.
Has the climate of Blue Mountains warmed?
Yes: Blue Mountains warmed by +1.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Blue Mountains?
The wettest day measured in Blue Mountains between 1940 and 2025 was 9 February 2020, with 166 mm of rain in 24 hours.
What was the windiest day in Blue Mountains?
The windiest day measured in Blue Mountains between 1940 and 2025 was 23 September 2009, with winds reaching 43.6 km/h.
What is the warmest month in Blue Mountains?
The warmest month in Blue Mountains is January (18.6 °C on average); the coldest is July (6.3 °C).
How much does it rain in Blue Mountains?
Blue Mountains receives on average 1,040 mm of precipitation per year, spread over about 133 rainy days.
Is it sunny in Blue Mountains?
Blue Mountains gets on average 9.9 hours of sunshine per day, roughly 3,614 hours per year over 1940-2025.
What is the biggest single-day snowfall in Blue Mountains?
The heaviest 24-hour snowfall measured in Blue Mountains between 1940 and 2025 was 29 August 1963, with 7.1 cm.
Are there tropical nights in Blue Mountains?
Yes: Blue Mountains has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Blue Mountains?
In Blue Mountains, between 1940 and 2025, the highest apparent temperature reached 40.6 °C on 31 January 2020, and the lowest was -8.0 °C on 26 July 1986.
Compare Blue Mountains with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Blue Mountains