Graph changes in time

[Markreg]

Hi,
I want to graph the temperature of water samples taken approx. once a week (but not exactly) during one year, hence, I do not want the data points to be distributed evenly in the x-direction Moreover I would like the dates (or months) to be shown in the x-axel (not as number 0-70 as in the upper graph in the attached file).

In the attached worksheet I have made two examples (one point graph and one line graph), neither of them satisfy my needs: The line graph looks ok but as I understand it is not possible to have data points unevenly distributed in this mode. The point graph also seems to distribute the points evenly?!, and I just cant the dates displayed correctly in this mode.

I use Excel 07 and I am highly grateful for any assistance

Best regards
Marco