Highs and lows

What were the maximum and minimum temperatures recorded in my max/min thermometer?
Exploring and noticing Working systematically Conjecturing and generalising Visualising and representing Reasoning, convincing and proving
Being curious Being resourceful Being resilient Being collaborative

Problem



I have a maximum / minimum thermometer in my greenhouse.

It records the highest and lowest temperatures reached since the time I reset it.

I reset it on Sunday when the temperature was $4^\circ \text{C}$.

Overnight the temperature fell by $5^\circ$.

Then during Monday it rose by $6^\circ$ before falling by $10^\circ$ during the night.

On Tuesday it rose by $4^\circ$ and fell by $2^\circ$ overnight.

What were the maximum and minimum temperatures recorded when I looked at the thermometer on Wednesday morning?