I teach physiology so I know a little about this.
Several factors drive blood pressure. The three major important factors are cardiac output (how much blood your heart pumps out), blood vessel diameter and blood volume. So...
Has your heart rate changed? If your heart rate has increased, that will increase your blood pressure. It is cold, you need to burn more fat to maintain your body temperature and that means more oxygen supply and that means a faster heart rate. (Still, this shouldn't push you bp to 160/100, you need to run a marathon to go from normal to 160/100).
Exposure to cold will cause an increase in epinephrine, thyroid hormone and cortisol. The epinephrine will boost cardiac output as well as decrease blood vessel diameter. Thyroid hormone will increase metabolism (are you craving more high calorie food?). Cortisol is a double-whammy: it will increase metabolism as well as increase salt retention which will increase blood volume. So, big point: if you are working more outside, in the cold, your body will respond by increasing metabolism and increase blood volume by increasing salt. This can translate into a higher blood pressure:
https://www.webmd.com/hypertension-...50119/cold-weather-can-raise-blood-pressure#1 .
Changes in blood cell concentration can also cause trouble. If you recently started exercising your body has probably been confronted with sudden O2 demand and could have reacted by increasing the number of red blood cells. Conversely, lung damage will decrease O2 absorption and your body responds by increasing the number red blood cells and heart rate (which will increase BP).
So, what now? Firstly, Ehanes' advice is spot on: go see a doctor. If you have high blood pressure but no change in heart rate it could imply some or other issue with cardiovascular, endocrine or nervous systems. If you are feeling more anxious that could be evidence of thyroid or adrenal gland problems.
With a diastolic bp of 100 mmHg you are already stage 2 hypertensive and this blood pressure will cause damage to your tissue (damage the kidneys, cause hemorrhages etc..). You need to get it seen to ASAP. In the meantime, stay away from caffeine as it also raises blood pressure a few points. Get to a doctor ASAP.
