Summer nights: Warm or cool? (hottest, South, january, live)

[nei]

Originally Posted by Teritus

He used 63 (17.2C) as an example of a cool night though, which is far from it - even most summer nights here are cooler than that.

He may have been referring to evening temperatures rather the nightly low.

[Joe90]

Originally Posted by MuffinMan16

I know it's just I'm used to the nights we had when I lived in Mississippi in the summer and I lived on a lake, they'd drown out the sound of anything else. That was the bare thing on my mind when I read warm nights, ruined me.

Fair enough .For me they represent warm, comfortable nights (above 18C) and for you they represent hot, uncomfortable nights.

Very noisy here too. I can hear them above the radio just now, and the radio is fair cranking -it's the 10 at 10 on the Sound Classic Hits, 1974 is the year this hour.

[nei]

Originally Posted by Joe90

Not always the case. My climate often gets dewpoints in the 15-20C/60-68F range, which is not overly humid, but certainly isn't dry. Days like that can still drop to 7-8C/46F (Average minimum 11.5C/53F) The dew the following morning, is something to behold.

What makes the dew point change something from day to night?

[Rozenn]

The humidity is all on the grass by sunrise. I bet the daytime seabreeze drings in most air from the ocean, rising the dew point compared to the night, when the offshore breeze blows.

It's quite common here to have a peak relative humidity in the afternoon, with the low diurnal range:
Weather History for Nice, France | Weather Underground

[nei]

Hmm. That occasionally happens on Long Island, but usually the same moist air also brings relatively cool temperature. Midsummer by the Atlantic can sometimes have a dew point around 70°F, temperatures in the upper 70s and mostly cloudy with wind. Not quite the beach weather most were hoping for inland.

Offshore breeze sounds odd after spending time on the west coast. Common on the west coast is light wind and clouds overnight then sometime in the day clearing with wind:

Weather History for North Bend, OR | Weather Underground

[Joe90]

Originally Posted by Rozenn

The humidity is all on the grass by sunrise. I bet the daytime seabreeze drings in most air from the ocean, rising the dew point compared to the night, when the offshore breeze blows.

Originally Posted by nei

What makes the dew point change something from day to night?

Several different scenarios. One like Rozenn mentioned, but that isn't typical, as that usually forms extensive low cloud that keeps the nights warmer.

More commonly it's the result of frontal rain, with no wind, and partially clear skies. There will be high rates of evaporation, with visible water vapor rising off the ground almost a constant for a day or two. A land breeze kicks in during the night, as air is drawn in replacing air rising of the relatively warm sea.

Another relatively common event is subtropical lows pushing warm moist air south. This gives strong convective activity, typically with sporadic light showers consisting of a few large drops and occasional lightning. This situation lasts until a cold front pushes it out (cold fronts here are usually just clear skies), or a high pushes it aside - highs are highly migratory, with a frequency of about one a week.

[MeteoFlan]

Nights in mid summer 20-23 about right.

[jyshao]

I like overnight lows below 60 degrees with low clouds and fog burning off by 10AM next morning. And then the sun shines for the rest of the day. Then fog rolls back in at night and repeats every summer. That's why the bay area has a very comfortable summer.

Downtown San Francisco or Pacifica? It's just too chilly and windy. Even though the temperature are in the 60s, that 20MPH wind can make you feel in the 50s during summer afternoon.

[jyshao]

I like the night with low clouds and fog with temperatures in the mid to upper 50s. Fog would provide refreshing ocean air from the pacific which makes good night sleep.

[eirik2306]

Oslo lows have been 15-21 this summer