It says "Valid for renewable 2 month periods", but nowhere else on their website is there an explanation of what this means exactly. If you need forecasting (which I don't), they seem to have the strongest focus on time-based predictions like "rain will start in 5 mins and end in 25 mins."ħ50 free calls per day (= once every 2 minutes).īut, this access only lasts for 2 months. Compare this to the dozens that OWM provide. There are only 8: "clear", "rain", "snow", "sleet", "wind", "fog", "cloudy", & "partly-cloudy". Piss-poor descriptions for the current weather state. More accurate than OWM, but still considerably less accurate than Wunderground. You only get 50 free calls per day (= once every 28 minutes), so they're pretty much out of the picture.ġ,000 free calls per day (= once every 1.5 minutes). 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:
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