You can always calculate it manually with a simple formula, but the 'big boys' have complex algorithms that factor in way more info than just the temp and wind speed to arrive at their 'feels like' temperature. OWM does not provide a 'feels like' or wind-chill temperature. If you just need temp or RH, then OWM should be fine, but for weather conditions, it simply is too all-over-the-place that ≈15% of the time. In addition, OWM updates much less frequently than Wunderground (eg, OWM's latest update was an hour ago, whereas the real weather status can potentially change dramatically in just a few minutes). This is because OWM has only 40,000 weather stations (vs Wunderground's 250,000).

Eg: OWM says 'light rain', but it is clear & sunny outside, or it says 'clear' and it is overcast. On a daily basis, it shows a blatantly incorrect weather condition. Too often, OWM weather conditions are not very accurate. Most important: OWM has robust and descriptive 'weather conditions' with granular distinctions. (Being free is in their mission statement.) Truly free (60 calls / minute) and will remain that way for the foreseeable future. The only API that I have significant experience with is Open Weather Map. I am also only interested in real-time weather conditions (ie, what it looks like outdoors currently), not future forecasts or past data. I am strictly interested in APIs that are 100% free for at least a couple hundred calls a day. This is a helpful website that ranks the various weather forecasting services by their actual accuracy:

It's been a fun ride, but now is time to abandon ship. If this sudden decision to 'enhance their relationship with their users' has taught us anything, it is to place zero faith in IBM. The parent company of The Weather Company is IBM. The second-most accurate weather source is (aka 'The Weather Company'), but they bought out Wunderground and they don't have their own API. Wunderground is the most accurate weather source in my experience (in suburban Ohio, USA). Now I know why:Īccess to Wunderground's API now starts at the low, low price of $850/month (= $10,200/year). You might notice that they don't even list their pricing on their website anymore. As of May 2018, free keys are no longer available for the Weather Underground API.

Best wunderground weather station