sommerhalvår

From sommer +‎ halvår.

sommerhalvår n (definite singular sommerhalvåret, indefinite plural sommerhalvår, definite plural sommerhalvåra or sommerhalvårene)

1. (literally) summer half-year, six-month period between the spring equinox and autumn equinox; it was traditionally from April 14th to October 14th

• vinterhalvår

• “sommerhalvår” in The Bokmål Dictionary.
• “sommerhalvår” in Det Norske Akademis ordbok (NAOB).