As the Reader is doubtlessly aware, the world in which we live in has no fixed state of weather. Wind, sun, rain and such come and go. Seasons change, different regions of the steppes have different ways to tell passing time, but also have wildly different names.

Summer, the default way everyone counts their Age and passing of time, is called: Lato, Leto, Lětom, Лєто. Leto is also a part of a season, commonly referred to as the warmer time.

An important note: Age is counted in Letos, but that is just a name the age is given in. A new leto considers itself to begin during the period around Marenna's Drowning, but Westerners and those of the Corner swap Leto for a Vesna (the regional name for Sunrise/Zorya, a time of bloom and life).
By most standards, a leto consists of 11 to 12 parts, individually called a ''moon''/"miesiąc"/"księżyc" due to the fact that the moon completes its cycle from New to Full during that time. It tends to be measured as a 28 to 32 day period, for there are exceptions and regional differences.

As by accounts of the Griffians, a leto is divided into 11 parts (called a ''miśicь'', plural "miśice"). Middle-to-south Sarmats divide into seven parts ("miesięce"), from which two are optional.
Westerners talk about eight parts (further divided into two: Nattleys and Skammdegi), in which they consistently align with the solar cycles. This creates a drift, so every 7th summer cycle a seven-day period is added (it is called Sumarauki).
Southerners from near the Baikal lake consider a leto to be divided into three, the warm-snow, cold-snow and no-snow parts. The divide is somewhat humorous but it flows better when spoken in their tongue.
The above incomplete observation catalogues that different lenghts of Long Night affects the naming and lenght of seasons. More parts seem to be noted in warmer climates, less parts in colder climates, and more accented and abrupt is the divide between hot and cold in the latter.