This is the 11618th most frequent Russian word.
жаркую
"Жаркую" means "hot" (feminine accusative singular form).
Here, 'жаркую' describes the noun 'погоду' (weather), implying a condition of being very warm or hot outdoors.
В жаркую погоду лучше оставаться в тени.
In hot weather, it's better to stay in the shade.
Here, 'жаркую' modifies 'пустыню' (desert), referring to the hot climate associated with deserts.
Мы отправились в жаркую пустыню исследовать её тайны.
We ventured into the hot desert to explore its secrets.
In this sentence, 'жаркую сковороду' uses 'жаркую' to describe 'сковороду' (skillet), indicating that the skillet is heated and ready for cooking.