They studied birth rates across Europe and found the proportion of boys over girls rose with the temperature.
The research team at St Luke's Hospital in Malta could not suggest why this might be the case, but suggested warmth might affect fertility and gender ratios.
Previous studies conducted in Denmark, the Netherlands, Canada and the US have shown a decrease in male births over the past three to five decades. But there was no similar drop in Malta, prompting the investigation into the effect of climate.
World-wide, 51.5% of births are boys. But the research team led by Dr Victor Grech found the ratio varied "significantly" from northern to southern Europe.
In Scandinavia, 51.2% were boys. In Central Europe - stretching from the UK to Poland - it was 51.3% and in Mediterranean countries, including Spain and Italy, it was 51.6%.
The research team at St Luke's Hospital in Malta could not suggest why this might be the case, but suggested warmth might affect fertility and gender ratios.
Previous studies conducted in Denmark, the Netherlands, Canada and the US have shown a decrease in male births over the past three to five decades. But there was no similar drop in Malta, prompting the investigation into the effect of climate.
World-wide, 51.5% of births are boys. But the research team led by Dr Victor Grech found the ratio varied "significantly" from northern to southern Europe.
In Scandinavia, 51.2% were boys. In Central Europe - stretching from the UK to Poland - it was 51.3% and in Mediterranean countries, including Spain and Italy, it was 51.6%.
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