http://ark.intel.com/nl/products/75038/Intel-Core-i5-4440-Processor-6M-Cache-up-to-3_30-GHz
Intel says temperatures of up to 72 degrees Celsius are fine, and I believe that's for 24/7 usage. For spikes you should just make sure you don't get above about 80-85 degrees.
Your temps are completely fine.