Name the biome that has cold winters, warm summers, moderate
seasonal precipitation, fertile soils and occasional wildfires.

Temperate Grasslands!

Explanation:

Mild prairies have sweltering summers and cold winters. Precipitation is moderate. The measure of yearly precipitation impacts the stature of field vegetation, with taller grasses in wetter districts. As within the savanna, regular time of year and infrequent flames are imperative to biodiversity.

So based on the description you have gave me, the temperate grasslands matches what you asked for!

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.