This is the 2195th most frequent Dutch word.
matige
"Matige" means "moderate" in English.
Here, 'matige' is used to describe the quality of the weather, meaning it's moderate or average in intensity.
Het weer vandaag is matige.
The weather today is moderate.
In this sentence, 'matig' is used to convey a less-than-spectacular quality to his performances.
Zijn prestaties waren slechts matige in vergelijking met vorig jaar.
His performances were only mediocre compared to last year.
This usage of 'matig' describes the traffic being not too heavy or too light in intensity.