Man, does China have a lot of cash in its rainy day fund.

FORBES: China's Cash Hoard Nearly Half Its GDP

Its rainy-day game room has Ping-Pong, pool, darts, and shuffleboard.

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South Africa is prone to lightning during its summer rainy season.

BBC: South Africa pupils in hospital after lightning strikes

Hanging over all this, of course, is the constitutional position of Wales within the UK. Does the Welsh political class want to get itself into a position where it is demanding significant extra revenues from England by virtue of its hilly terrain and rainy climate?

BBC: Highly politicised liquid assets

Like a drought-stricken city draining its reservoir during what should be the rainy season, the nation has been forced to tap its gasoline stockpiles this spring, leaving them well below average with the busy summer driving season still to come.

NPR: Refinery Backlog Prompts Spike in Gas Prices

During the rainy season, the Amazon crashes over its banks, turning entire forests into inland seas and swelling to an average of 28 miles wide along its inland length and 300 miles wide at its mouth.

BBC: Taming the heart of the Peruvian Amazon

On its surface, saving money for a long period of rainy days makes sense.

FORBES: Written by By Drew Hofler

Guamanchi and Assari tours to Lake Maracaibo are best arranged during rainy season between May and December, when electrical activity is at its peak.

BBC: Venezuela��s Andean playground

Schemer tailors its recommendations to the time and the weather, so if it's a rainy afternoon the app will recommend a museum visit instead of a long hike.

BBC: Four new impromptu-activity apps

Although it has had an impressive track record of growth, its ability to turn a profit is still a question mark and it is likely that the company will need rainy day funds in the future.

FORBES: Why Facebook Needs More Cash