Cuaca sejuk memberi kesan yang sangat ketara kepada populasi burung walet setempat. Kehadiran salji dan hujan membatasi keaktifan serangga terbang di udara seterusnya mengurangkan sumber makanan burung walet. Sebagai perbandingan mudah pada monsun timur laut kematian anak burung walet sangat tinggi di dalam rumah burung walet di tiga negeri di pantai timur kerana kekurangan makanan.
Adakah salji yang turun di vietnam sekarang membawa penghijaran burung walet ke selatan negara itu atau ke Thailand mungkin juga ke Malaysia.
Di bawah sedikit matlumat tentang keadaan suhu di Vietnam.... Rất kĩ lục 25 năm qua tại Việt Nam
LAO CAI - Snow fell in many areas across the northern mountainous region as a strong cold spell envelops almost half of the country since yesterday.
Freezing temperatures were also reported in other areas, such as minus 0.4 degree C in Tam Dao (Phu Tho Province), minus 0.2 degree C in Dong Van (Ha Giang province) and minus 4 degree C in Mau Son Mountain (Lang Son province).In Hanoi, the highest temperature today is forecast from 7 to 10 degree C.
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