Julia is taking some inroads in climate modelling: "when the coder-climatologists of the Climate Modeling Alliance (CliMA) — a coalition of US-based scientists, engineers and mathematicians — set out to build a model from the ground up, they opted for a language that could handle their needs. They opted for Julia."
https://www.nature.com/articles/d41586-019-02310-3
https://clima.caltech.edu/