Cold weather can actually cause colds, study finds

I just spent a week working outside in sub-zero weather and high wind-chill, and developed a terrible cold. Now I know why! Thanks for this explanation. I intend to stay inside where it's warm, drink plenty of fluids, take vitamins C & D, and rest until I'm better.

A 1960 study

I'm not sure that the results of a 55 year old study should be taken so seriously. Old studies also suggested that the sun revolved around the earth. Even if the study has been re-examined, the evidence supporting the hypothesis is sketchy at best. Biological activity has always been shown to be at its optimal at 37 Celsius, regardless of the virus/bacteria/enzyme etc. For the 'Rhinovirus' to be more active four degrees below this would go against all laws of biophysics. It's an anomaly. It has to be.

showing cold viruses replicated more efficiently

Viruses don't replicate. They can't replicate. They invade a host cell and force that cell to mass produce the virus cell so extensively that the host cell is destroyed. There is a distinction. Failing to properly address that distinction calls the research into question. If one section is shown to be invalid, then it follows that the entirety is also in error. One mistake is all it takes for a hypothesis to collapse upon itself, especially when said mistake is at the core principle of the theory.

I'm going to ignore this research, because I know from personal experience that lower temperatures accelerate my recovery, and also provide short term relief during infection (cold air causes the blood vessels in the nose to constrict, opening up the nasal passages and allowing easier breathing). Regardless of the cause, treatment remains the same, so focus on that rather than questionable theories about how infection occurs. Most of the time it comes down to your immune system anyway, and that can be weakened by poor diet, alcohol consumption, drug use, stress, and countless other factors. Additionally, the tests were conducted upon mice, who are not Humans, and have different biologies to people, different immune systems, different resistances and vulnerabilities.