No matter what the conditions are you should still go after it. This is true in your training and in life. It's not always going to be 70 degrees and sunny. The road may not always be smooth. You may not feel 100%. That is the time to really step up and do the things that need to be done.
Our troops do this all the time. Special forces train in unpleasant conditions because they know that when the time comes for action it won't be pleasant. They condition themselves for bad conditions. They get physically and mentally stronger. They understand that getting comfortable being uncomfortable is a necessity for success.
What will you do to get conditioned with any condition? What will you do out of your comfort zone to get stronger?
Will you just do whats comfortable and never grow? Will you not take the chance and stay in your nice warm house of comfort?
Get out and get conditioned. Rise up to the challenge and get stronger!