day length

(redirected from Daytime length)

day length

the number of daylight hours per day, increasing towards midsummer and the reverse towards midwinter. The effective trigger in the commencement and cessation of the breeding seasons in those species that demonstrate seasonal breeding.
References in periodicals archive ?
More worrisome is the fact that the daytime length, which is vital to the aircraft, will also be getting shorter over the course of the next few weeks, posing further challenges for the planned journey.