Being a beach-loving dude from tropical Philippines, I'm always concerned about the weather and, more specifically, the temperatures here in Japan. I'd like to call myself a summer person, because I realized that while we in the Philippines consider the temperatures there from December to February as cool, they're still actually summer temperatures in other countries, Japan, included, and even warmer than the summers in even more countries and places.
Anyways, so I always check the weather and temperature forecasts practically on a daily basis. In fact, maybe almost on a bi-hourly basis. I always felt Accuweather has the most accurate temperatures (at least for current conditions), but now I installed my own adhoc thermometer just outside my window, and now I'm using three other weather apps: Meteorologist on my desktop, the default Weather app on my phone (Yahoo!-based weather actually), and this "Celsius" app, also on my phone.
I took screenshots of the temperatures at one time, and here they are.