Question: Last night, I walked home from my bus stop (in Belgium). Since it was around 11 PM, it was quite cold, probably only about 4-5 °C. However, it didn't actually feel cold at all, and I didn't feel like I had to rush to get home for the cold. In fact, I didn't have headwear on, but I didn't get cold ears. It was about the same temperature as this morning, but the difference is that this morning felt a lot colder, probably due to the wind and drizzle.

I tried to describe it in English on Twitter, but I couldn't actually find a proper word to decribe it. I considered "a warm cold" or "a cozy cold", but I thought these were too poetic, more like something you'd use in a fairy tale than in a tweet to a handful of followers.

How can you describe that temperature without it becoming confusing or poetic?

Answer: 
I realize this doesn't serve the single-word tag, but perhaps you could separate the temperature from your perception:

'I was unaffected by the cold' or 'I didn't feel the cold'

With your description of the morning you could state: 'compared with the rainy wind in the morning, it didn't feel cold.'
"Real Feel" is the word which is used in accuweather. Usually morning is more colder than nights beacuse in morning we are coming out of "warm home" and till night we become used to.