The phrase describes a calm summer night that lacks both stars and movement, creating an atmosphere of stillness. The mention of "distant spasms of silent lightning" adds an intriguing element, suggesting a tension beneath the serene surface of the night. This imagery evokes a sense of isolation and the quiet beauty of nature, emphasizing the contrasting elements of peace and latent energy in the ambiance.

Nabokov masterfully captures a moment in time, where the absence of stars enhances the darkness, yet the unseen lightning hints at potential unpredictability. This juxtaposition serves to engage the reader's imagination, inviting them to reflect on the nuances of the environment and the emotions it evokes. The quote encapsulates the profound and often contradictory relationship between tranquility and unrest in the natural world.