Climate Chart of Juneau, Alaska, USA

Monthly data: Temperature °C, Rain (mm), Sunshine (h) · 2013–2023

For Juneau, Alaska, USA, the climate data cover 2013–2023. Monthly mean temperatures range from -2.5 °C in February to 15.2 °C in July, giving a broad picture of the year’s thermal variation without describing daytime highs or lows. Rainfall and snowfall are reported as daily means, while sunshine figures describe mean daily duration. Together, these measures provide a useful seasonal overview, but they do not predict conditions on any particular day.

Climate overview

Temperature

The monthly mean temperature is lowest at -2.5 °C in February and reaches its annual high of 15.2 °C in July. These are averages for each month, not daytime maximum temperatures, so they describe the broad temperature pattern rather than the full range visitors may encounter within a day. Across the calendar-month means, the unweighted mean is 5.6 °C. This offers a compact year-wide reference, but it is not a day-weighted annual average and does not imply that conditions remain near that value throughout the year.

Rain

Mean daily rainfall reaches its lowest monthly level at 1.02 mm/day in March; visitors prioritising lower average rainfall could consider that month, while remembering that this does not guarantee dry days or indicate how often rain falls. The highest monthly mean is 11.31 mm/day in September, making rain preparation particularly relevant for plans then. The unweighted mean of the monthly daily-rainfall means is 5.44 mm/day. These are daily amounts, not monthly totals, and averages alone do not describe the timing or frequency of individual showers.

Sunshine

Mean daily sunshine duration peaks at 9.49 hours/day in May, a useful reference for visitors planning outdoor time around average sunshine. The lowest monthly mean is 1.28 hours/day in December; these figures describe sunshine duration, not day length or a guarantee of clear skies. Across the calendar months, the unweighted mean daily sunshine duration is 5.56 hours/day. It gives a broad annual benchmark, while actual sunshine on a particular visit may differ from the monthly average.

Snow

Mean daily snowfall reaches its highest monthly level at 48.57 mm/day in December. The unweighted mean across the monthly daily-snowfall means is 19.54 mm/day; neither figure establishes how many days have snow, snow depth, snow cover, or whether conditions suit skiing.

Best Travel Time Guide for Juneau, Alaska, USA: Ideal Seasons and Weather Insights

For travel weather, March is a conditional option if your priority is lower average daily rainfall, with a mean of 1.02 mm/day; it does not promise rain-free sightseeing or quantify the frequency of wet days. If travelling in September, when the mean daily rainfall reaches 11.31 mm/day, plan for the possibility of rain and keep outdoor arrangements flexible. Visitors prioritising cooler monthly mean temperatures can look to February, at -2.5 °C. For average sunshine duration, May has the highest mean at 9.49 hours/day, while December has the lowest at 1.28 hours/day; these are separate criteria, and sunshine duration is not the same as daylight length.

The reported snowfall mean is highest in December, at 48.57 mm/day per day. This average can inform expectations about recorded snowfall, but it cannot tell you how many snowy days to expect or establish snow depth, cover, or skiing conditions, so avoid treating it as a guarantee for a particular itinerary.

Climate Data Overview for Juneau, Alaska, USA

Explore the comprehensive climate data for Juneau, Alaska, USA. This detailed table provides valuable insights into temperature variations, precipitation levels, and seasonal changes, helping you understand the unique weather patterns of this region.

Month	Average: Temperature °C	Rain (mm) / day	Snow (mm) / day	Sunshine (h) / day
Jan	-1.0	3.61	43.52	1.84
Feb	-2.5	1.50	42.19	3.93
Mar	-0.4	1.02	32.28	5.93
Apr	3.6	3.09	20.75	7.26
May	8.8	5.02	1.74	9.49
Jun	13.0	5.68	0.00	9.27
Jul	15.2	6.20	0.00	8.67
Aug	14.7	10.01	0.00	7.45
Sep	11.4	11.31	0.03	5.66
Oct	6.1	9.96	11.55	3.80
Nov	0.7	4.90	33.89	2.16
Dec	-2.0	2.95	48.57	1.28
Average	5.6	5.44	19.54	5.56