I've started a very complicated update for the project at my work and it had a requirement to get the current weather conditions (specifically temperature and humidity) for a geocoordinate point. I settled on using the OpenWeatherMap API because it provided what I needed and the free account allows for more than enough daily usage for my needs.
I looked at what was available on NuGet, but the packages available were years out of date and I didn't like having to rely on potentially abandoned packages. So, in the spirit of all the other API clients I've made so far, I rolled my own package: Arex388.OpenWeatherMap. Since I only needed the current weather conditions for a geocoordinate point, I only implemented that functionality, but if there's demand for more I'll expand the functionality. NuGet is available here.