If one takes the time to actually read the Night City sourcebook, a clear idea forms in his mind: It's mostly a beliviable place, a city that reflects the society who inhabits it. You got combat zones and peaceful sub-urbs, business centers and recreational districts, shitholes and artificial paradises (heck, there is even a park in 2020 version!). And players are meant to visit all these places one day or another.
Cyberpunk 2020 included an adventure supplement called Night City Stories (cover art in my previous post) which included a number of descriptions for the GM to read to the players, as well as some solely for the GM. Although not all these descriptions indicate the atmosphere, of those that do include such text:
"Chapter One: The Call to Arms - In which the characters receive a strange telephone call, run about in the rain, ..."
"The thousands of lights in the Night City docklands were not just comforting."
"The constant hiss of the rain bouncing high off cracked asphalt is now the only sound you can hear."
"Above Wilbur's constant chatter, the sound of splashing footsteps can be heard, the sound of a single man running towards the building...Rain drips steadily from the brim of his hat as he closes the door and turns to face you."
"Chapter Two: A Night to Remember - In which the characters meet two women in one pair of shoes, run about in the rain, ..."
"It's late, Baker Street is quiet, and the rain has slowed to a dull drizzle which hangs in the air like mist."
"A long black sedan hushes along the rain-soaked street and pulls up in the arc of soft light which emanates from a nearby street lamp."
"The light which spills through the door is the only illumination for a block and a half which isn't a street light or headlamps."
"The roof of Central II is the largest Night City heliport and as you approach you see perhaps a dozen black-windowed helicopters drop out of the bleach-boned glare that is Night City daytime."
"As Caitlin Jones watched through the hazy droplets of water which covered the images, she realized that it wasn't just rain that was falling...Wiping tears and rain from her eyes, Caitlin hit the ignition."
"The exterior of the hotel Pallazo is busy this time of night."
"Her thoughts were punctuated by the slow and regular dripping of rain water from the roof to the floor."
"Just a shadow in the darkness, the hunched man falls only a hundred meters from the fountain."
"Late at night in the Infocomp offices, Caitlin Jones worked under a single lamp, compiling the data she had just obtained."
"The rain buffets constantly against the shaded glass of the windows and you settle in for the night."
"When you arrive at the address, Holly leads you towards a dark alley."
"As you approach, the floodlights at the front of the building kick on, flooding the area with light and sending beams into the night sky."
"The rain has turned to grey sleet and everything has stopped moving."
One description of daytime sunlight and otherwise it is always either night or raining, if not both.
The player-characters are expected to operate in typical Cyberpunk conditions, not generally be strolling out in the sun.