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It depends on a lot of factors, particularly season and time of day.
The difference is most noticeable in summer and least noticeable in winter when thermal inversions may be present. More noticeable in the afternoon than in the early morning and so on.
There is also less variation from day to day over the ocean than on land.
I'm at 80m asl. On 1 August 2013, we had 31C. Leeds Bradford Airport, at 207m asl, had 27C (I presume most people can feel the difference). Great Dun Fell, at 847m asl, had 7.8C.
Altitude is very important in my country. Not least because even at low altitude, a large part of the year has temperature not very far from freezing. So driving conditions over the mountains might be very different from near sea level.
Here's one example from just now today at 14:00:
Lærdal at 2m asl (innermost Sognefjord): 6.9C
Sogndal airport 500m asl: 1.7C
Sognefjellshytta (lodge) at 1,413m asl: -6.5C
Fannaråki (mountain) at 2,062m asl: -10.2C
Distance from the fjord is also of importance.
Many weather maps and other maps doesn't have good enough resolution to be very usefull for Norway, because of the topography and because of the mountains and mountain plains covering a large part of the country.
Say, you're at 40m above sea level and the temperature is 30C (86F) with the humidity at 40%.
Now you go to a nearby hill which is 100m above sea level, would the temperature or humidity be any different?
Hmm...
40m ASL compared to a hill at 100m ASL ....no real difference,
hill location might actually have warmer lows and dense cold air "sinks" at night.
Look at difference between Phoenix and Tucson for example,
Both cities have a hot and dry climate but Tucson being about 500m higher
is noticeably cooler and imo has a better climate than Phoenix.
I think you would have to go quite high in elevation to notice any difference. And sometimes it's the opposite because warmer air rises, so it's an inversion. I did experience an inversion recently. On October 26th of this year, I was at Hickory Run State Park in the Poconos. The point in the park I started at is off an east-west road where hiking trails start on either side heading north and south. The one going south decreases in elevation and the one heading north increases in elevation. I started out on the one going south, which leads to a nice waterfall. I had brought several extra layers of sweaters in my backpack and had to use them at this point, as it was quite chilly. Got to the waterfall, went back up, crossed the road, and went on the trail headed north. At this point I had to take off all the layers, as I was quite warm in them. I have a park map which also shows elevation isolines, and the highest point I was at on the northbound trail was about 1900' (580m). An hour later after heading south again, crossing the road again, and heading down towards the waterfall, I was at about 1400' (425m) again by the waterfall. So the difference in elevations I experienced was roughly 500 feet or 150m. I needed to put my layers back on as I was chilly once more. Looking on the map, right around the waterfall is a valley where the elevation drops off significantly, so I can definitely see how inversions can occur this way.
Created this graph in Excel, with a pretty sunrise in the background:
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