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 = 'charlestown' and st_surl='new-hampshire' and iso_cc = 'US' and prim_loc in (1,2) Charlestown New Hampshire Climate Data - Updated February 2026

Charlestown New Hampshire Climate Data

Monthly Average Climate Data for Charlestown New Hampshire

Switch Data to Celsius/Metric Units

Month	Avg. Low	Avg. High	Avg. Precip
January	10.8 °F	30.5 °F	2.8 in.
February	11.9 °F	33.8 °F	2.37 in.
March	20.9 °F	41.9 °F	2.88 in.
April	32.8 °F	55.4 °F	3.17 in.
May	43.8 °F	67.9 °F	3.42 in.
June	53.3 °F	76.7 °F	3.91 in.
July	58.7 °F	82.0 °F	4.03 in.
August	56.6 °F	80.4 °F	3.86 in.
September	48.9 °F	73.2 °F	3.68 in.
October	37.3 °F	59.5 °F	4.7 in.
November	28.1 °F	47.0 °F	3.14 in.
December	18.6 °F	35.3 °F	3.47 in.
Annual	35.1 °F	57 °F	41.43 in.

Climate Data for Charlestown New Hampshire

Average First Frost Date	Oct. 1 - Oct. 10
Average Last Frost Date	May 1 - May 10
Average Days With Frost	125-150 Days
Plant Hardiness Zone	Zone 5b : -15°F to -10°F
Plant Hardiness Zone - 2012	Zone 5a : -20°F to -15°F
Current Drought Conditions	Moderate Drought
Köppen Climate Classification	Dfb - Humid Continental Mild Summer, Wet All Year

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