Is Los Angeles sunnier than Ontario?

Ontario is the sunnier: about 3,804 hours of sunshine a year versus 3,009 — a difference of 795 hours.

Which is warmer, Los Angeles or Ontario?

Ontario is warmer across the year: average daytime highs of 27°C (81°F) versus 25°C.

Which is better in winter (November–February), Los Angeles or Ontario?

They are close in the November–February window: Los Angeles averages 84/100 (about 21°C days), Ontario 85/100 (about 20°C).

Los Angeles vs Ontario: which is sunnier?

🇺🇸 United States vs 🇺🇸 United States · 75 km apart · long-term climate normals (NASA POWER, 2001–2020)

Ontario is the sunnier overall: about 3,804 hours of sunshine a year to Los Angeles's 3,009. Ontario has the higher Sunshine Score in 6 of 12 months, Los Angeles in 5 (1 within 2 points).

Scores are the 0–100 Sunshine Score — sunshine, daytime warmth and dryness in one number, per month.

At a glance

	Los Angeles	Ontario
Sunshine hours / year	3,009	3,804
Sunniest month	June (97/100)	May (99/100)
Nov–Feb average score	84/100	85/100
Jun–Aug average score	97/100	70/100
Rain / year	332 mm	290 mm
Peak midday UV	10 (very high)	10 (very high)

Los Angeles vs Ontario month by month

Month	Sunshine Score		Day high °C		Rain mm
Month	Los Angeles	Ontario	Los Angeles	Ontario	Los Angeles	Ontario
January	83	82	20°	19°	73	58
February	83	88	20°	20°	75	63
March	89	94	22°	22°	42	32
April	93	97	23°	25°	19	18
May	95	99	26°	28°	9	7
June	97	90	29°	33°	1	1
July	96	59	32°	36°	2	5
August	97	60	32°	36°	1	3
September	96	79	31°	34°	3	5
October	94	97	28°	29°	17	16
November	92	96	23°	23°	25	24
December	78	74	19°	18°	65	58

The sunnier month by month: Jan even · Feb Ontario · Mar Ontario · Apr Ontario · May Ontario · Jun Los Angeles · Jul Los Angeles · Aug Los Angeles · Sep Los Angeles · Oct Ontario · Nov Ontario · Dec Los Angeles.

When to pick which

November–February: too close to call — Los Angeles averages 84/100, Ontario 85/100. Daytime highs are similar (21°C vs 20°C). See the winter sun ranking.
March–May: Ontario (average score 97/100 vs 92). Daytime highs are similar (24°C vs 25°C).
June–August: Los Angeles (average score 97/100 vs 70). Ontario is the warmer, around 35°C daytime highs vs 31°C.
September–October: Los Angeles (average score 95/100 vs 88). Ontario is the warmer, around 32°C daytime highs vs 30°C.

Full month-by-month guides: Los Angeles weather by month · Ontario weather by month · Best time to visit United States.

More comparisons: Los Angeles vs San Diego · Los Angeles vs Santa Barbara · Ontario vs San Diego · Ontario vs Santa Barbara · Ontario vs Palm Springs · all head-to-heads