Climate averages 1991–2020

Ar Rass weather
in January.

A mild, very dry month: the coolest and the joint 9th driest of the year. Meets the pleasant-weather rule

Long-term climate patterns, not a forecast for a particular trip.

Average high 19.3°C Daytime mean, January

Average low 6.3°C Night-time mean, January

Rainfall 13 mm 2 days with ≥1 mm

Daylight 11 h Sunrise to sunset, per day

January is a mild month in Ar Rass: daytime highs average 19.3°C and nights cool to about 6.3°C. By daytime temperature it is the coolest month of the year.

Expect about 13 mm of rain on roughly 2 days, which makes January a very dry month (the joint 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 43 min on an average January day.

The nearest other city in this atlas is Unaizah (56 km away). In January its highs average 18.7°C, 0.6°C cooler than Ar Rass, with 14 mm of rain.

Among the 35 cities listed in Saudi Arabia, Ar Rass ranks joint 21st of 35 for the warmest January highs and joint 12th of 35 for the driest January (rainfall, lowest first). The mean January high of those 35 cities is 20.9°C; Ar Rass is 1.6°C cooler than that mean.

From January to February, average highs rise by 3.3°C to 22.6°C, and monthly rainfall falls from 13 mm to 5.9 mm.

The annual picture

January in context

30-year average

Average highAverage low°C

Monthly rainfall

Average total · mm

Averages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated

Every month, side by side

Ar Rass climate table

1991–2020

Monthly climate averages for Ar Rass, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January, selected	19.3°C6.3°C	6.3°C	13	2.4	10.711 h
February	22.6°C8.1°C	8.1°C	5.9	1.1	11.311 h
March	26.8°C12.2°C	12.2°C	14	2.2	12.012 h
April	32.3°C17.3°C	17.3°C	13	2.7	12.813 h
May	37.7°C22.1°C	22.1°C	1.7	0.4	13.413 h
June	40.8°C24.1°C	24.1°C	0	0.0	13.714 h
July	41.7°C25.0°C	25.0°C	0	0.0	13.614 h
August	42.1°C25.5°C	25.5°C	0	0.0	13.013 h
September	39.4°C23.0°C	23.0°C	0.1	0.1	12.312 h
October	33.9°C18.4°C	18.4°C	2.7	0.4	11.612 h
November	25.8°C12.8°C	12.8°C	20	3.0	10.911 h
December	20.7°C8.0°C	8.0°C	12	2.3	10.611 h

Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.

Compare places

January in nearby cities

Distance from Ar Rass

Read the numbers correctly

Climate, not a promise.

These patterns help compare months. They cannot tell you the weather on a specific day of your trip.

Sources, method and limits

How these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Ar Rass) is explained once on the Ar Rass year overview and on the Sources, method and limits page.