Specific examples.The places near to sea are not different obviously. Because cities near the seas impressed by the temperate influence of the sea. So we'll choose some cities from North and south circle are far to sea and will examine them by differences of temperature night and day.
First lets all us look to map to find out ideal cities for see the difference obviously.
This is Australia map:
Almost all cities are placed on inshore except one: Alice Springs.
Lets measure it to sea:
About 900 kms.
Now we'll find out other cities has the distance to sea as 900 kms for compare it by objectivity.
Lets find another city in Southern circle:
There are two cities seems like far to sea: Gaborone and Lusaka.
Lets measure them:
Gaborone has about 700 kms distance to sea. So it is not useful for our experiment.
Lets measure the other one:
864 kms. It is closed to 900 kms; so we selected Lusaka as a spesific city for our test.
Now we have two cities in Southern circle are far to sea about 860-900 kms. For compare them we need two other cities in Northern circle.
Lets look to North America.
I drawed there a line has 900 kms lenght for see about where will be stay the city which we can choose.
They seems like two cities to be possible about 900 kms to sea Edmonton and Winnipeg. Lets measure them are they true or not.
We see these two cities on same image that both of them are useful for our test.
On. Now we selected 4 cities that 2 are from south and two are fron north and have distance about 900kms. Now we eliminated the factor of distance to sea.
Although we have 4 cities, we will be picking 2 new cities for North Asia and South America.
Brasilia and Novgorod are useful.
We have 6 cities that 3 from North and 3 from south and all of them are about 900 kms far to sea. We selected all of these cities by online, right here, right now.
Brasilia, Lusaka and Alice Springs from South America, South Africa and Australia which cities are far to sea about 900 kms;
Edmonton, Winnipeg and Novgorod from North America and Asia which cities are far to sea about 900 kms.
Lets do it.
This is final image:
there is a problem on upload site so i used another one.
At the end of the this working, all of 3 cities in the northern circle have lower day and night temperature differences than the cities on the south; which have same distance to the sea.
CITY / PLACE / AVERAGE YEARLY TEMPERATURE DIFFERENCE
Novgorod North 8,25
Edmonton North 9,00
Winnipeg North 10,17
Lusaka South 10,33
Brasilia South 11,25
Alice Springs South 15,42
I'll add all of city data later.
Yet i added only data of January.
imgsafe is not a safesite oppositely it's name . I'll change it later to another one. so i did'nt add all of images to it.