Climate averages 1991–2020

Longyearbyen weather
in July.

A cool, fairly dry month: the warmest and the 5th driest of the year.

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

Average high 8.1°C Daytime mean, July

Average low 5.3°C Night-time mean, July

Rainfall 32 mm 8 days with ≥1 mm

Daylight 24 h Midnight sun: no sunset

July is a cool month in Longyearbyen: daytime highs average 8.1°C and nights cool to about 5.3°C. By daytime temperature it is the warmest month of the year.

Expect about 32 mm of rain on roughly 8 days, which makes July a fairly dry month (the 5th driest of the 12 months). In July the sun stays above the horizon all day.

From July to August, average highs fall by 1.3°C to 6.8°C, and monthly rainfall rises from 32 mm to 40 mm.

The annual picture

July in context

30-year average

Average highAverage low°C

Monthly precipitation

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

Longyearbyen climate table

1991–2020

Monthly climate averages for Longyearbyen, 1991–2020
Month	Average highHigh / low	Average low	Precipitation mm/month	Wet days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	-11.1°C-15.9°C	-15.9°C	43	8.9	0.00 h, polar night: no sunrise
February	-11.6°C-16.3°C	-16.3°C	31	7.2	2.02 h
March	-11.7°C-16.3°C	-16.3°C	35	8.4	11.211 h
April	-8.1°C-12.3°C	-12.3°C	23	6.8	20.520 h
May	-1.6°C-4.5°C	-4.5°C	21	6.0	24.024 h, midnight sun: no sunset
June	3.3°C1.6°C	1.6°C	17	5.0	24.024 h, midnight sun: no sunset
July, selected	8.1°C5.3°C	5.3°C	32	8.2	24.024 h, midnight sun: no sunset
August	6.8°C3.9°C	3.9°C	40	9.0	23.423 h
September	2.4°C-0.8°C	-0.8°C	45	9.8	14.715 h
October	-4.0°C-8.0°C	-8.0°C	41	9.1	6.06 h
November	-6.8°C-11.6°C	-11.6°C	47	10.3	0.00 h, polar night: no sunrise
December	-9.6°C-14.4°C	-14.4°C	45	9.7	0.00 h, polar night: no sunrise

Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.

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