Don't forget to look at the image results also... 2 out of 20 is not to bad.... Some results will vary from hour to hour depending on the competition... I think those 2 keywords would have loads of competition and position may change frequently.
I think this is an overage position over the period of time you are looking for all I know you might never SEE youself in that position. Also keep in mind google might be moving you up and down constantly due to high competition and or new data coming in (backlinks) Therefore take this for what it is, a rough estimate.
Wow, I'm on page 1 of image search for 'Christmas'! I was getting an extra 5000 visitors per day over Christmas so I shouldn't be surprised. And I'm on page 1 for 'Girls' (page 2 with no adult content filter). I love Google.
Depends on what datacenter you are searching.... Try geoseo-dot-com and you will get an extended report!
I found out that it is pretty accurate but the rankings are image search rather than the normal search.