Climate averages 1991–2020

Kalmunai weather
in December.

A warm, very wet month: the 11th warmest and the wettest of the year.

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

Average high 27.2°C Daytime mean, December

Average low 24.2°C Night-time mean, December

Rainfall 310 mm 23 days with ≥1 mm

Daylight 12 h Sunrise to sunset, per day

December is a warm month in Kalmunai: daytime highs average 27.2°C and nights cool to about 24.2°C. By daytime temperature it is the 11th warmest of the 12 months.

Expect about 310 mm of rain on roughly 23 days, which makes December a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 11 h 42 min on an average December day.

The nearest other city in this atlas is Batticaloa (37 km away). In December its highs average 27.3°C, about as warm as Kalmunai, with 302 mm of rain.

Among the 12 cities listed in Sri Lanka, Kalmunai ranks 8th of 12 for the warmest December highs and 12th of 12 for the driest December (rainfall, lowest first). The mean December high of those 12 cities is 27.8°C; Kalmunai is 0.6°C cooler than that mean.

From December to January, average highs fall by 0.2°C to 27.0°C, and monthly rainfall falls from 310 mm to 186 mm.

The annual picture

December 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

Kalmunai climate table

1991–2020

Monthly climate averages for Kalmunai, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	27.0°C24.0°C	24.0°C	186	17.8	11.712 h
February	27.8°C24.1°C	24.1°C	96	13.2	11.912 h
March	29.5°C24.7°C	24.7°C	60	10.0	12.112 h
April	30.8°C25.8°C	25.8°C	70	13.3	12.312 h
May	32.3°C26.6°C	26.6°C	59	11.6	12.512 h
June	33.2°C26.6°C	26.6°C	31	6.7	12.513 h
July	33.2°C26.4°C	26.4°C	31	7.5	12.513 h
August	32.8°C26.1°C	26.1°C	42	9.3	12.412 h
September	32.0°C25.9°C	25.9°C	67	13.6	12.212 h
October	30.2°C25.2°C	25.2°C	164	20.8	12.012 h
November	28.2°C24.5°C	24.5°C	280	24.8	11.812 h
December, selected	27.2°C24.2°C	24.2°C	310	22.6	11.712 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

December in nearby cities

Distance from Kalmunai

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 Kalmunai) is explained once on the Kalmunai year overview and on the Sources, method and limits page.