The information below is from the manual, and it looks like it requires work to make "work". the size of the gif needs to be cropped otherwise it will only show up as awkwardly as a long strip. I tried to manipulate the details and although I can get the gif to animate, it is large 480*640.
this link gives information on how to use the gif to animate. replace the fire.png with the weather gif and you can experiment.
This is the name of the image that holds the image frames. The images can be laid horizontally or vertically in the bitmap. The orientation is determined automatically form the hieght or the width of the bitmap (whichever is larger). Also the size of one frame is calculated automatically so you need to crop the image so that there is no extra space around the frames.
The number of frames in the bitmap.
If set to 1, the first frame is used only when the measured value is zero. Otherwise the frames are linearly determined by the measured value.
If set to 1 the bitmap is extended so display the whole value. For example if you define a bitmap that defines frames from 0 to 9 you can use this to display the measured value as the bitmap numbers.
Number of digits that are drawn. The first frame is used if the value doesn't have as many digits as this defines. Works only when BitmapExtend is set to 1.
Defines the alignment of the bitmap value. Valid values are LEFT, CENTER and RIGHT. Works only when BitmapExtend is set to 1.