In this case, Uber is an international business that operates in the northern and southern hemisphere and many places with other relevant weather patterns like rainy seasons and dry seasons. The seasonality at this point is likely almost entirely smoothed out by the sheer number of places they operate in globally. The US market might be larger and more mature, but many international markets have largely caught up now.
https://www.nytimes.com/2017/05/31/technology/uber-limits-lo...
> The company said Wednesday that it lost $708 million over the first three months of the year on revenue of $3.4 billion, not counting expenses like employee stock compensation. That is a narrowing of the previous quarter’s loss of $991 million, on revenue of $2.9 billion.
revenue grew by ~500M, losses fell by ~300M. this isn't just more butts in seats trying to avoid the rain. this is about increased efficiency; each trip costing less in incentives and efficiency doesn't depend on the weather, or the hemisphere.
anyway, if the trend continues, we'll know more in a week.