Stopped laying, and not laying

[moms Tree]

My buff Orpington hatched in September of 2013. She started laying eggs Feb 20, 2014. Laid for about 2 weeks, then abruptly stopped. Haven't seen an egg from her since, and she is not laying in the yard. Incidently, only 5 of my 18 Easter Egger chickens are laying eggs... they hatched the end of November. Could this be due to the constant changing weather in central Kansas? We've had highs of 100 degrees, to highs of only 50 degrees... could this be messing up their "season"?

 

[Mountain Peeps]

Yes, it could very well be the temp changes.