Since block times are so slow now, the average of the last 100 blocks is way more representive of the actual current blocktime than what clona.ru is reporting!
Check for example: http://dbix.litwiller.us/calculator.html
Here you can see the average blocktimes for different time spans.
Clona.ru is using >1000 block average it seems, so that would mean they still include block times that were generated during the peak moments over a week a go when hashrates were still very high near the 2TH/sec.

For example, the last 48 hours has produced 113 blocks. That is ~25.5 minutes per block. Thats equals ~1530 seconds, which is pretty similar to the figure i gave before based on the last 100 blocks.

The last 24 hours had produced 40 blocks. That is ~36 minutes per blocks. So the situation seems to be worsening...
And I know, the less blocks used to calculate the average, the less accurate results you get. But still, at 40 blocks you should get a decent picture of the average blocktime imo.