Days 1-14 are a real forecast from global weather models. Days 15-30 are season-typical values based on climate normals 1991-2020 (MET) — good for planning, NOT an exact forecast that far ahead.
30 days — Lillehammer
14 real + 16 synthesised
Tue · Today Partly cloudy
+23°+8°0,8 mm
Wed · Tomorrow Clear
+18°+6°0,3 mm
Thursday 23/7 Clear
+21°+3°3%
Friday 24/7 Partly cloudy
+20°+6°17%
Saturday 25/7 Partly cloudy
+18°+6°1,2 mm
Sunday 26/7 Showers
+13°+10°15,9 mm
Monday 27/7 Drizzle
+11°+8°19,6 mm
Tuesday 28/7 Drizzle
+12°+7°4,9 mm
Wednesday 29/7 Partly cloudy
+18°+3°6%
Thursday 30/7 Clear
+21°+3°4%
Friday 31/7 Partly cloudy
+23°+6°8%
Saturday 1/8 Partly cloudy
+24°+7°0,3 mm
Sunday 2/8 Partly cloudy
+21°+9°9%
Monday 3/8 Partly cloudy
+17°+9°0,2 mm
Tuesday 4/8 Rain (climate normal)
+16°+9°10,7 mm
Wednesday 5/8 Partly cloudy (climate normal)
+21°+12°20%
Thursday 6/8 Partly cloudy (climate normal)
+21°+12°20%
Friday 7/8 Rain (climate normal)
+20°+12°10,4 mm
Saturday 8/8 Partly cloudy (climate normal)
+17°+10°20%
Sunday 9/8 Partly cloudy (climate normal)
+14°+8°20%
Monday 10/8 Rain (climate normal)
+15°+9°4,8 mm
Tuesday 11/8 Partly cloudy (climate normal)
+17°+10°20%
Wednesday 12/8 Partly cloudy (climate normal)
+19°+11°20%
Thursday 13/8 Rain (climate normal)
+19°+11°4,3 mm
Friday 14/8 Partly cloudy (climate normal)
+17°+10°20%
Saturday 15/8 Partly cloudy (climate normal)
+16°+9°20%
Sunday 16/8 Rain (climate normal)
+14°+8°9,6 mm
Monday 17/8 Partly cloudy (climate normal)
+16°+10°20%
Tuesday 18/8 Partly cloudy (climate normal)
+16°+10°20%
Wednesday 19/8 Rain (climate normal)
+20°+12°7,5 mm
How does the long-range forecast work?
Days 1-14: Fetched live from global weather models (ECMWF, GFS) with statistical correction. Reliability about 85 % for days 1-3, about 60 % for days 7-10, about 45 % for days 11-14.
Days 15-30: A real forecast does not exist that far ahead (chaotic system). Instead we show season-typical values: the monthly average Tmax/Tmin from climate normals 1991-2020, with mild weekly variation.
Use: «About how warm is it usually in Oslo the last week of July?» — a good question for days 15-30. «Will it rain on 27 May?» — no serious forecast can answer that.