My body temperature as far as I remember has always been around 35.6 degrees Celsius, that's a degree less than what is the usually quoted as the average temperature for humans.
Are there any known correlations such as a shorter/longer average lifespan or pronounced traits such as being more sensitive to warmer temperatures or later/earlier onset of hypothermia symptoms?
Or is it not low at all or low enough to have any noticeable effects.
Yes absolutely. Body temperature is associated with basal metabolic rate which is linked to life-span/body mass. Keeping your body at temperature is responsible for the majority of your caloric burden majority of your caloric burden, and having a lower resting temperature would mean you require fewer calories to survive. Higher body temps are thought to have been a defense against parasite infection, so reductions in body temperature might leave you more susceptible to disease, however a paper came out recently discussing falling body temperature in the US and its implications, and I think it addresses many of your questions in detail in the discussion.
Edit: To elaborate on that elife paper, they've identified a small reduction in average body temperature overtime using military medical records going back to the civil war. They postulate that the reductions they observe are due to improvements in healthcare and a potential decrease in chronic inflammation in the population which increases your body temperature.
Whilst it is possible that your actual core temperature is actually lower than the normally quoted average of 37.5 Celcius by a degree, it may also be the case that where you are measuring is below the average rather than your actual core temperature. For example, you might be measuring under your armpit, and perhaps due to low circulation in that area, it does not fully reflect your actual core temperature. Just a thought.
Mammalian enzymes have an optimum temperature range. Too low, and the rate of reaction is too slow to effectively support the organism. Too high, and the enzymes will denature (loose their tertiary and quaternary structure.)
So if your core temperature really is a degree lower, we might expect your metabolism to be slowed due to the effect on enzyme catalysed reactions. The rule for this is expressed as Q10, Q10 temperature sensitivity units in stack biochem.
Another possible effect is that a lower body temperature could mean being more prone to infection, as discussed in stack geneticsenter link description here. Temperature rise during infection (having a fever) is thought to be an attempt to thwart an infectious organism, so it follows that a lower temperature may aid teh infecting organism.