Casey Station (Australian Antarctic Territory) climate
Casey Station (Australian Antarctic Territory) (Antarctica) has an ice cap climate (Köppen EF). The average temperature over the year is −14 °C7 °F, and about 364 mm14 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Casey Station (Australian Antarctic Territory) climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | −131 | −621 | −326 | 200.8 | 31 |
| Feb | −425 | −915 | −720 | 281.1 | 28 |
| Mar | −916 | −146 | −1211 | 281.1 | 31 |
| Apr | −138 | −18−1 | −164 | 361.4 | 30 |
| May | −163 | −21−6 | −19−2 | 351.4 | 31 |
| Jun | −171 | −23−9 | −20−4 | 371.5 | 30 |
| Jul | −172 | −22−8 | −19−3 | 401.6 | 31 |
| Aug | −171 | −23−9 | −20−4 | 331.3 | 31 |
| Sep | −154 | −21−6 | −18−1 | 331.3 | 30 |
| Oct | −139 | −19−2 | −164 | 241.0 | 31 |
| Nov | −621 | −139 | −915 | 251.0 | 30 |
| Dec | −229 | −719 | −524 | 251.0 | 31 |
| Year | −131 | −23−9 | −147 | 36414 | 365 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 78% | 75% | 8.1 | 21:01 |
| Feb | 78% | 78% | 5.7 | 16:41 |
| Mar | 81% | 81% | 3.1 | 13:08 |
| Apr | 84% | 82% | 1.1 | 9:21 |
| May | 85% | 78% | 0.2 | 5:41 |
| Jun | 86% | 78% | 0.0 | 2:38 |
| Jul | 84% | 81% | 0.1 | 4:07 |
| Aug | 85% | 81% | 0.6 | 7:49 |
| Sep | 83% | 79% | 2.3 | 11:36 |
| Oct | 80% | 77% | 4.9 | 15:19 |
| Nov | 77% | 73% | 7.7 | 19:27 |
| Dec | 77% | 71% | 9.1 | 24:00 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Casey Station (Australian Antarctic Territory) is like
The warmest month is January, with an average high of −1 °C31 °F and a low of −6 °C21 °F. The coldest is August, when highs average −17 °C1 °F and lows −23 °C−9 °F. There is a clear seasonal cycle, with 16.7 °C30.1 °F between the average temperature of the warmest and the coolest month.
It is dry, with about 364 mm14 in of precipitation per year. The wettest three-month stretch is May–July, which brings 31% of the annual total. Months with less than 20 mm0.8 in on average: January. The wettest month is July (40 mm1.6 in), the driest is January (20 mm0.8 in).
Relative humidity ranges from 77% in November to 86% in June. The clearest skies (lowest average cloud amount, 71%) are typical of December. Average wind speed near the ground ranges from 19 km/h (12 mph) in January to 32 km/h (20 mph) in July. Daylight lasts from about 2.6 hours in June to 24.0 hours in December.
Best time to visit Casey Station (Australian Antarctic Territory)
No month comes close to our comfort ideal here. The least demanding months are January, February and December (average highs −1 °C31 °F, −4 °C25 °F and −2 °C29 °F).
The most challenging month is August, which is cold, with average highs of −17 °C1 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Casey Station (Australian Antarctic Territory)
- Summer (December–February) — highs −425 to −1 °C31 °F, lows −915 to −6 °C21 °F, about 24 mm0.9 in of precipitation a month. Pack a winter coat, hat, gloves and warm, non-slip boots and shoes with good grip, as frost is common.
- Autumn (March–May) — highs −163 to −9 °C16 °F, lows −21−6 to −14 °C6 °F, about 33 mm1.3 in of precipitation a month. Pack heavy insulated clothing, thermal base layers, a warm hat, mittens and insulated boots.
- Winter (June–August) — highs around −17 °C1 °F, lows −23−9 to −22 °C−8 °F, about 37 mm1.4 in of precipitation a month. Pack heavy insulated clothing, thermal base layers, a warm hat, mittens and insulated boots.
- Spring (September–November) — highs −154 to −6 °C21 °F, lows −21−6 to −13 °C9 °F, about 27 mm1.1 in of precipitation a month. Pack heavy insulated clothing, thermal base layers, a warm hat, mittens and insulated boots.
How Casey Station (Australian Antarctic Territory) compares
Places in other countries with the most similar temperature and rainfall pattern (seasons shifted for the other hemisphere where needed): Tiksi (Russia, ET), Longyearbyen (Svalbard and Jan Mayen, ET) and Norilsk (Russia, Dfc).
Nearby places
Frequently asked questions
What is the warmest month in Casey Station (Australian Antarctic Territory)?
January is the warmest month in Casey Station (Australian Antarctic Territory), with an average high of -1 °C (31 °F) and an average low of -6 °C (21 °F).
What is the coldest month in Casey Station (Australian Antarctic Territory)?
August is the coldest month, with an average high of -17 °C (1 °F) and an average low of -23 °C (-9 °F).
When does it rain the most in Casey Station (Australian Antarctic Territory)?
July is the wettest month with about 40 mm (1.6 in) of precipitation; January is the driest with about 20 mm (0.8 in).
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.