select pnm,lnm,st_cd,st_nm,cnty_id,dm,dm_date,dm_hist,avg_tmax_data,avg_tmin_data,avg_prcp_data,rec_hi_data,rec_lo_data,avg_sndp_data,x,y,ff,lf,fd,hz,er,hz_source,kg,hzd,clim_stn_nm,hz12,hz90, feels_like_min,feels_like_max,days_of_prcp,snow,cloud_cover,humidity,wind_speed from worldtg8_pm.pm_climate_points_namer where surl = 'southwest-harbor' and st_surl='maine' and iso_cc = 'US' and prim_loc in (1,2) Southwest Harbor Maine Climate Data - Updated February 2026

Southwest Harbor Maine Climate Data

Monthly Average Climate Data for Southwest Harbor Maine

Switch Data to Celsius/Metric Units

Month	Avg. Low	Avg. High	Avg. Precip
January	15.3 °F	31.2 °F	4.6 in.
February	16.6 °F	32.9 °F	3.85 in.
March	24.4 °F	39.5 °F	4.74 in.
April	34.3 °F	50.0 °F	4.51 in.
May	43.5 °F	60.3 °F	4.37 in.
June	52.0 °F	69.6 °F	4.2 in.
July	57.9 °F	75.3 °F	3.24 in.
August	57.7 °F	75.0 °F	3.01 in.
September	51.7 °F	68.1 °F	4.1 in.
October	41.7 °F	57.0 °F	5.67 in.
November	32.4 °F	46.9 °F	5.53 in.
December	22.0 °F	37.3 °F	5.55 in.
Annual	37.5 °F	53.6 °F	53.37 in.

Climate Data for Southwest Harbor Maine

Average First Frost Date	Oct. 21 - Oct. 31
Average Last Frost Date	Apr. 21 - Apr. 30
Average Days With Frost	100-125 Days
Plant Hardiness Zone	Zone 6a : -10°F to -5°F
Plant Hardiness Zone - 2012	Zone 5b : -15°F to -10°F
Current Drought Conditions	Severe Drought
Köppen Climate Classification	Dfb - Humid Continental Mild Summer, Wet All Year

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