By Jim Smith for the Blue Mountains Conservation Society This is the link to the full article https://www.bluemountains.org.au/timeline.shtml

Winter Weather
July/August: Coldest months, frosts, snowfalls, waterfalls may freeze. August: Westerly winds, often have effects on plants growth and form, and on bird behaviour.
Mammals
June: Swamp Rat, Rattus lutreolus, numbers peak (born May/June). Many young present.
Pygmy Possums and Feathertail Gliders in torpor.
Quoll breeding season. Males wander.
July: Bush Rat and Swamp Rat, Rattus fuscipes and Rattus lutreolus, numbers lowest, adults die off.
August: Marsupial mice, Antechinus, mating. Males die at end of mating season.
Reptiles and Frogs
Broad-headed Snakes shelter under rocks. (will bask in sun). Most reptiles in torpor. Goannas bask in sun. Whistling Tree Frogs continue to call. Insects Ghost Moths fly Nellies Glen Butterflies, Pseudalmenus chlorinda, pupate on wattles. Gnats swarm over heaths.
Blue Spotted Painted Ladies, Vanessa kershawii, migrating southbrown butterfly. (late August)
Aquatic
August: Trout spawn. Eels migrate from sea up Hawkesbury River to mountain streams (Aug-Sep). On upper Blue Mountains plateau only in Greaves Creek. Mountain Minnows, Galaxias, hibernate in mud. Clam Shrimps, Conchostracans, dormant in pools as eggs.

Birds
June: Lyrebird calls peakbreeding season. Flocking: Black Cockatoos, Satin Bowerbirds (males) and Red Wattlebirds. Crescent Honeyeaters seen on escarpments, influx from south, can breed in area. Breeding: New Holland Honeyeaters, Powerful Owls, Wedge-tailed Eagles.
Influx of Eastern Spinebills (June to September). In lower mountains influx is in May to July.
July: ‘Spring’ begins for birds.
Resident birds (insectivores) form territories, begin to breed. Tree Martins return.
Male Superb Fairy Wrens turn blue. Lyrebird eggs laid. Many juvenile New Holland Honeyeaters.
August: Many breeding birds, territorial calls, eg.Fantail Cuckoo, Grey Shrike Thrush.
Night calls (Boobook Owls, Tawny Frogmouths, Masked Lapwings) through to November.
Young Lyrebirds in nests. Migrants reappear. Noisy Friarbirds, Grey Fantails, Flame Robins. Major honeyeater migration back from north begins. Magpie nesting and bombing can begin
Plants
Banksia spinulosa, Banksia ericifolia nectar flow. Winter wattles flower: Sunshine Wattle, Acacia terminalis, first, then Acacia longifolia. Greenhood Orchids flower, e.g. Pterostylis longiflora,
Pterostylis grandiflora. In August: Lady’s Fingers Orchids, Caladenia catenata, flower. Red bird pollinated flowers abundant – Styphelia, Epacris reclinata, some Lambertia formosa, Grevillea acanthifolia.