When it's winter in the northern hemisphere, it's summer in the southern hemisphere. So, if it's April in the northern hemisphere, is it still April in the southern hemisphere?

Yes, it's still April in the Southern Hemisphere. However the seasons are reversed. April is fall in the Southern Hemisphere. Christmas in Australia is in the summer there.

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yes

Yes, if it's April in the northern hemisphere, it is still April in the southern hemisphere. The reason for this is that the divisions of time, such as months, are globally standardized and do not change based on the position of the Earth in relation to the sun. However, it is important to note that while the names of the months remain the same, the seasons themselves are opposite in the two hemispheres. So, while it may be spring in the northern hemisphere during April, it will be autumn in the southern hemisphere.