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 = 'thomaston' and st_surl='connecticut' and iso_cc = 'US' and prim_loc in (1,2) Thomaston Connecticut Climate Data - Updated February 2026

Thomaston Connecticut Climate Data

Monthly Average Climate Data for Thomaston Connecticut

Switch Data to Celsius/Metric Units

Month	Avg. Low	Avg. High	Avg. Precip
January	17.2 °F	36.0 °F	3.53 in.
February	18.4 °F	39.1 °F	3.16 in.
March	25.9 °F	47.0 °F	4.37 in.
April	35.9 °F	59.8 °F	3.96 in.
May	46.3 °F	70.8 °F	4.13 in.
June	55.7 °F	79.3 °F	4.59 in.
July	61.1 °F	84.3 °F	4.8 in.
August	59.5 °F	82.3 °F	4.76 in.
September	52.1 °F	75.2 °F	4.63 in.
October	40.6 °F	63.0 °F	5.54 in.
November	31.0 °F	51.5 °F	4.04 in.
December	23.4 °F	40.9 °F	4.61 in.
Annual	38.9 °F	60.8 °F	52.12 in.

Climate Data for Thomaston Connecticut

Average First Frost Date	Oct. 1 - Oct. 10
Average Last Frost Date	Apr. 21 - Apr. 30
Average Days With Frost	100-125 Days
Plant Hardiness Zone	Zone 6b : -5°F to 0°F
Plant Hardiness Zone - 2012	Zone 6a : -10°F to -5°F
Current Drought Conditions	Abnormally Dry
Köppen Climate Classification	Dfa - Humid Continental Hot Summers With Year Around Precipitation

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