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Calakmul (/ˌkɑːlɑːkˈmuːl/; also Kalakmul and other less frequent variants) is a Maya archaeological site in the Mexican state of Campeche, deep in the jungles of the greater Petén Basin region. It is 35 kilometres (22 mi) from the Guatemalan border. Calakmul was one of the largest and most powerful ancient cities ever uncovered in the Maya lowlands.

Calakmul was a major Maya power within the northern Petén Basin region of the Yucatán Peninsula of southern Mexico. Calakmul administered a large ___domain marked by the extensive distribution of their emblem glyph of the snake head sign, to be read "Kaan". Calakmul was the seat of what has been dubbed the Kingdom of the Snake or Snake Kingdom. This Snake Kingdom reigned during most of the Classic period. Calakmul itself is estimated to have had a population of 50,000 people and had governance, at times, over places as far away as 150 kilometers (93 mi). There are 6,750 ancient structures identified at Calakmul, the largest of which is the great pyramid at the site. Structure 2 is over 45 metres (148 ft) high, making it one of the tallest of the Maya pyramids.

Four tombs have been located within the pyramid. Like many temples or pyramids within Mesoamerica the pyramid at Calakmul increased in size by building upon the existing temple to reach its current size. The size of the central monumental architecture is approximately 2 square kilometres (0.77 sq mi) and the whole of the site, mostly covered with dense residential structures, is about 20 square kilometres (7.7 sq mi).

Throughout the Classic Period, Calakmul maintained an intense rivalry with the major city of Tikal to the south, and the political maneuverings of these two cities have been likened to a struggle between two Maya superpowers.

Calakmul (/ˌkɑːlɑːkˈmuːl/; also Kalakmul and other less frequent variants) is a Maya archaeological site in the Mexican state of Campeche, deep in the jungles of the greater Petén Basin region. It is 35 kilometres (22 mi) from the Guatemalan border. Calakmul was one of the largest and most powerful ancient cities ever uncovered in the Maya lowlands.

Calakmul was a major Maya power within the northern Petén Basin region of the Yucatán Peninsula of southern Mexico. Calakmul administered a large ___domain marked by the extensive distribution of their emblem glyph of the snake head sign, to be read "Kaan". Calakmul was the seat of what has been dubbed the Kingdom of the Snake or Snake Kingdom. This Snake Kingdom reigned during most of the Classic period. Calakmul itself is estimated to have had a population of 50,000 people and had governance, at times, over places as far away as 150 kilometers (93 mi). There are 6,750 ancient structures identified at Calakmul, the largest of which is the great pyramid at the site. Structure 2 is over 45 metres (148 ft) high, making it one of the tallest of the Maya pyramids.

Four tombs have been located within the pyramid. Like many temples or pyramids within Mesoamerica the pyramid at Calakmul increased in size by building upon the existing temple to reach its current size. The size of the central monumental architecture is approximately 2 square kilometres (0.77 sq mi) and the whole of the site, mostly covered with dense residential structures, is about 20 square kilometres (7.7 sq mi).

Throughout the Classic Period, Calakmul maintained an intense rivalry with the major city of Tikal to the south, and the political maneuverings of these two cities have been likened to a struggle between two Maya superpowers.

Perth receives moderate, though highly seasonal, winter-based rainfall. Summers are generally hot, sunny and dry, lasting from December to March, with February generally the hottest month. Winters are relatively mild and wet, giving Perth a hot-summer Mediterranean climate (Köppen climate classification Csa). Perth has an average of 8.8 hours of sunshine per day, which equates to around 3,200 hours of sunshine and 138.7 clear days annually, making it Australia's sunniest capital city.

Summers are typically hot and dry but not completely devoid of rain, with sporadic rainfall in the form of short-lived thunderstorms, weak cold fronts and on occasions decaying tropical cyclones from Western Australia's north-west, which can bring heavy rain. Temperatures above 35 °C (95 °F) occur, on average, 26 days per year and rise above 40 °C (104 °F) on 5 days per year. The highest temperature recorded in Perth was 46.2 °C (115.2 °F) on 23 February 1991, although Perth Airport recorded 46.7 °C (116.1 °F) on the same day. On most summer afternoons a sea breeze, known locally as the Fremantle Doctor, blows from the south-west, providing relief from the hot north-easterly winds. Temperatures often fall below 30 °C (86 °F) a few hours after the arrival of the wind change. In the summer, the 3 p.m. dewpoint averages at around 12 °C (54 °F).

Winters are mild and wet, with most of Perth's annual rainfall between May and September. Winters see significant rainfall as frontal systems move across the region, interspersed with clear and sunny days where minimum temperatures tend to drop below 5 °C (41 °F). The lowest temperature recorded in Perth was −0.7 °C (30.7 °F) on 17 June 2006. The lowest temperature within the Perth metropolitan area was −3.4 °C (25.9 °F) on the same day at Jandakot Airport, although temperatures at or below zero are rare occurrences. The lowest maximum temperature recorded in Perth is 8.8 °C (47.8 °F) on 26 June 1956. It occasionally gets cold enough for frost to form. While snow has never been recorded in the Perth CBD, light snowfalls have been reported in outer suburbs of Perth in the Perth Hills around Kalamunda, Roleystone and Mundaring. The most recent snowfall was in 1968.

The rainfall pattern has changed in Perth and south-west Western Australia since the mid-1970s. A significant reduction in winter rainfall has been observed with a greater number of extreme rainfall events in the summer, such as the slow-moving storms on 8 February 1992 that brought 120.6 millimetres (4.75 in) of rain, heavy rainfall associated with a tropical low on 10 February 2017, which brought 114.4 millimetres (4.50 in) of rain, and the remnants of ex-Tropical Cyclone Joyce on 15 January 2018 with 96.2 millimetres (3.79 in). Perth was also hit by a severe thunderstorm on 22 March 2010, which brought 40.2 mm (1.58 in) of rain, and large hail and caused significant damage in the metropolitan area.

Perth receives moderate, though highly seasonal, winter-based rainfall. Summers are generally hot, sunny and dry, lasting from December to March, with February generally the hottest month. Winters are relatively mild and wet, giving Perth a hot-summer Mediterranean climate (Köppen climate classification Csa). Perth has an average of 8.8 hours of sunshine per day, which equates to around 3,200 hours of sunshine and 138.7 clear days annually, making it Australia's sunniest capital city.

Summers are typically hot and dry but not completely devoid of rain, with sporadic rainfall in the form of short-lived thunderstorms, weak cold fronts and on occasions decaying tropical cyclones from Western Australia's north-west, which can bring heavy rain. Temperatures above 35 °C (95 °F) occur, on average, 26 days per year and rise above 40 °C (104 °F) on 5 days per year. The highest temperature recorded in Perth was 46.2 °C (115.2 °F) on 23 February 1991, although Perth Airport recorded 46.7 °C (116.1 °F) on the same day. On most summer afternoons a sea breeze, known locally as the Fremantle Doctor, blows from the south-west, providing relief from the hot north-easterly winds. Temperatures often fall below 30 °C (86 °F) a few hours after the arrival of the wind change. In the summer, the 3 p.m. dewpoint averages at around 12 °C (54 °F).

Winters are mild and wet, with most of Perth's annual rainfall between May and September. Winters see significant rainfall as frontal systems move across the region, interspersed with clear and sunny days where minimum temperatures tend to drop below 5 °C (41 °F). The lowest temperature recorded in Perth was −0.7 °C (30.7 °F) on 17 June 2006. The lowest temperature within the Perth metropolitan area was −3.4 °C (25.9 °F) on the same day at Jandakot Airport, although temperatures at or below zero are rare occurrences. The lowest maximum temperature recorded in Perth is 8.8 °C (47.8 °F) on 26 June 1956. It occasionally gets cold enough for frost to form. While snow has never been recorded in the Perth CBD, light snowfalls have been reported in outer suburbs of Perth in the Perth Hills around Kalamunda, Roleystone and Mundaring. The most recent snowfall was in 1968.

The rainfall pattern has changed in Perth and south-west Western Australia since the mid-1970s. A significant reduction in winter rainfall has been observed with a greater number of extreme rainfall events in the summer, such as the slow-moving storms on 8 February 1992 that brought 120.6 millimetres (4.75 in) of rain, heavy rainfall associated with a tropical low on 10 February 2017, which brought 114.4 millimetres (4.50 in) of rain, and the remnants of ex-Tropical Cyclone Joyce on 15 January 2018 with 96.2 millimetres (3.79 in). Perth was also hit by a severe thunderstorm on 22 March 2010, which brought 40.2 mm (1.58 in) of rain, and large hail and caused significant damage in the metropolitan area.