Helena Historic Weather Records
Analyse hottest, coldest, windiest & wettest days

Helena Weather Trend Graph

Temperature (°C)

Months

Months	Historic Min Temp.	Min Temp.	Forecasted Min Temp.	Historic Max Temp.	Max Temp.	Forecasted Max Temp.
	-13.03125	-1.9		-4.5562499999999995	4.2
	-11.431249999999999	0.4		-3.1125000000000007	6.6
	-11.40625	-1.7		-2.56875	3.7
	-11.956249999999999	-2		-1.8875	7.4
	-11.081250000000002	-5.5		-2.6125	2.6
	-10.38125	-5.3		-1.05625	0.4
	-9.037500000000001	-4.8		-1.5374999999999996	2.1
	-10.5375	-8.6		-0.8500000000000001	-0.6
	-9.756250000000001	-9.7		-0.6874999999999999	-0.8
	-11.3875	-4.4		-1.0937500000000002	5
	-12.925000000000002	-3.6		-4.36875	5
	-12.387500000000001	-0.2		-2.8375000000000004	6.1
	-10.268749999999999	0.9		-1.9125000000000003	7.1
	-10.21875	0.1		-1.69375	9.4
Jan.	-10.61875	-4.8		-2.26875	3.5
	-9.781250000000002	-8.4		-0.5625000000000001	-2.4
	-8.675	-8.9		-0.86875	3.6
	-8.8125	-4.2		-1.15	5.7
	-10.068750000000001	-7.6		-0.3687499999999999	5.7
	-9.3	-6.8		-0.35000000000000003	-0.4
	-8.431249999999999	-10.6		0.24375	-4.9
	-8.76875	-16.9		-0.9750000000000001	-8.1
	-9.075000000000001	-19.2		-0.39999999999999997	-12.4
	-8.831249999999999	-18.6		-0.4875000000000001	-9.6
	-8.0125	-18.2		-0.025000000000000022	-3.8
	-8.649999999999999	-13		0.275	3
	-8.793750000000001	-5.4		0.024999999999999988	4.9
	-10.39375	-5.2		0.2375000000000001	1.9
	-8.31875	-5.2		0.8937499999999999	3.7
	-9.59375	-5.4		0.26249999999999996	4.6
	-9.63125	-1.6		-0.6437499999999998	7.4
	-9.89375	-1		-0.6124999999999998	7
	-10.50625	-2.6		-1.0062499999999999	4.5
	-12.96875	-1.9		-2.925	6
	-12.09375	-4.3		-2.725	11.6
	-10.7625	-1.6		-1.7062499999999998	12.5
	-10.91875	-1.2		-2.6	12.7
	-11.69375	0.9		-2.5624999999999996	11.8
	-12.962499999999999	-0.6		-2.7687500000000003	8.1
	-12.518749999999999	-3.4		-3.4687500000000004	2.6
	-12.231249999999998	-4.3		-2.8625	3.5
	-12.45625	-3.8		-2.33125	5.4
	-10.91875	-3.1		-0.8562499999999998	6.2
	-8.662500000000001	-1.9		0.5312499999999998	5.9
	-8.637500000000001	-5.6		-0.75625	7.7
Feb.	-8.73125	-1.9		-0.018750000000000155	8.2
	-8.575	-5.6		-0.08124999999999993	9.2
	-9.4875	-3.6		-1.1875	1.6
	-10.525	-13.1		-1.725	-3.8
	-10.8625	-18.2		-1.3999999999999997	-4.6
	-10.475	-16.8		-1.0374999999999996	0.4
	-12.09375	-10.4		-1.2625	2.7
	-11.212499999999999	-10.1		-2.2875	8.4
	-12.28125	-5.9		-2.4374999999999996	7.6
	-12.275000000000002	-3.6		-2.2687499999999994	4.8
	-10.7875	-5.7		-1.0250000000000004	1.4
	-10.9875	-2.3		-0.23750000000000027	6.9
	-10.606249999999998	-3.4		0.4687499999999999	6.8
	-8.73125	-4.1		1.9500000000000002	5.1
	-9.168750000000001	-2.9		1.55	8.9
	-8.843750000000002	-1.7		1.36875	8.4
	-7.6875	-1.6		1.0687499999999999	12.3
	-7.75	-1.7		1.44375	8.5
	-7.293749999999999	-3.6		2.75625	4.2
	-6.968749999999999	-4.5		2.7375000000000007	3.4
	-6.6875	-3.1		4.13125	9.1
	-7.00625	1.2		3.54375	11.3
	-7.181250000000001	-6.7		3.2750000000000004	2.4
	-6.8625	-7.2		4.1499999999999995	0.7
	-6.25625	-7.9		5.2125	5
	-5.25	-1.2		6.5062500000000005	5.6
	-4.000000000000001	-4.9		6.312500000000001	1.1
	-3.1937500000000005	-8.8		6.675000000000002	5.3
Mar.	-4.112499999999999	-14.7		6.174999999999998	-0.5
	-4.44375	-4.2		5.61875	7
	-4.63125	1.7		5.74375	11.9
	-4.1312500000000005	2.3		6.449999999999999	16
	-4.28125	3.3		6.35625	17.8
	-4.49375	5		5.66875	19.3
	-4.675000000000001	-0.5		7.3375	11.5
	-3.181250000000001	-3		6.7	9.6
	-3.6812500000000004	-0.8		6.606250000000001	14.7
	-3.0437500000000006	2.3		6.525000000000001	17.5
	-3.58125	-2.8		6.356249999999999	12.6
	-3.3375	-4.6		7.775	4.5
	-2.7875000000000005	-6.8		9.09375	12.7
	-2.1499999999999995	0.5		9.068749999999998	15.7
	-2.2875	2.1		7.29375	14.3
	-2.9625	-2.6		7.593750000000001	4.3
	-2.61875	-6.8		8.1125	8.4
	-2.7937499999999997	-0.5		8.06875	14.7
	-3.75	1.7		7.268750000000001	6.9
	-4.231249999999999	1		8.125	11.2
	-2.3499999999999996	1.1		9.625	16.3
	-2.7375000000000003	-0.3		8.175	18.6
	-2.6499999999999995	2.2		8.39375	19
	-2.40625	4.4		9.825000000000001	19.1
	-2.0625000000000004	-3.2		9.19375	17.2
	-2.9562500000000003	1.1		9.225000000000001	16.8
	-1.9812499999999997	-0.7		10.99375	21.2
	-0.86875	5.6		10.418750000000001	18.2
	-2.425	2.5		7.943749999999999	14.6
	-3.125	2.6		7.406249999999999	14.9
	-3.2375000000000003	3.9		7.55625	15.7
Apr.	-3.3374999999999995	4.3		8.512500000000001	16
	-2.475	-0.6		8.137500000000001	5.8
	-2.0062500000000005	-1.4		9.656249999999998	6.7
	-2.70625	-1.5		9.9125	17.4
	-1.35625	-0.8		10.537500000000001	21.8
	-1.65625	5.8		10.9375	26
	-0.60625	5.8		11.58125	27.8
	-0.275	5.8		12.656249999999998	19.4
	-0.28125000000000006	-0.3		12.349999999999996	3.2
	0.29374999999999996	-2.8		12.64375	3.6
	0.4562500000000001	-4.5		13.099999999999998	7.2
	1.2562499999999999	-0.7		13.062500000000002	2.7
	0.44999999999999996	-1.4		13.325	9.7
	0.575	1.9		11.5875	12.5
	0.16875000000000007	1.4		11.2	14.7
	0.3624999999999998	1.1		12.487500000000002	18.7
	0.79375	1.7		13.312499999999998	23.6
	0.8062500000000001	4.5		14.587499999999999	23.2
	1.55	5.5		15.1625	24.6
	2.2624999999999997	6.9		16.1625	16.8
	2.85625	1.6		16.28125	9.8
	3.0999999999999996	-2.9		16.01875	22.8
	2.3874999999999997	10.2		13.3	20.4
	1.875	6.7		14.05	24.5
	2.4125	9.3		14.318750000000001	20.2
	2.3812499999999996	5.8		15.3	27.5
	2.425	13.4		14.681249999999999	24.8
	2.7125000000000004	6.7		16.91875	27.3
	3.63125	8.5		16.8	30.7
	3.8875	7.1		16.9125	18.3
May	4.4750000000000005	6.2		18.387500000000003	17.2
	5.15	2.8		17.14375	11.7
	4.96875	1.3		16.700000000000003	7.4
	5.19375	0.1		15.649999999999997	13.1
	3.3874999999999993	1.7		15.45625	17.4
	3.4562500000000003	1.9		14.60625	16.3
	3.4875000000000003	4.5		16.03125	15.4
	4.281250000000001	3.1		16.287499999999998	20
	4.0375	5.2		15.35	25
	4.406249999999999	8.8		14.206249999999997	27.1
	4.08125	9.7		17.15	29.9
	5.1625	12		16.85	30.8
	6.112500000000001	11.8		17.28125	30.6
	6.09375	14.9		16.54375	32.9
	5.30625	13.8		18.55625	31.4
	5.99375	12.8		18.900000000000002	16.7
	7.018750000000001	5.4		19.95625	14.6
	7.199999999999999	5.8		19.931250000000002	16.1
	7.05	6.4		19.562499999999996	19.6
	7.637499999999999	7.2		20.1375	25.4
	7.50625	12		21.38125	23.5
	7.7375	8.4		22.412500000000005	28.6
	8.35	13		22.556250000000002	26.5
	8.593749999999998	6.1		21.675000000000004	13.1
	8.44375	1.5		22.043750000000003	24.8
	8.618750000000002	9.3		21.76875	19.4
	7.5875	7		19.699999999999996	13.5
	7.412499999999999	9		19.693749999999998	22.8
	7.437500000000001	7.7		21.549999999999997	22.3
	8.06875	7.5		21.393750000000004	18.7
	7.437499999999999	5.4		21.2375	24.7
Jun.	7.5125	7.2		20.543749999999996	28.2
	7.53125	17.8		19.525	29.2
	7.343749999999999	11.7		20.1	23.1
	8.05	10		20.2125	24.3
	8.3875	8.5		19.993750000000002	26.1
	7.125	11.6		19.050000000000004	28.3
	6.531249999999999	11.2		21.200000000000003	26.8
	8.350000000000001	10.3		21.831249999999997	21.7
	8.374999999999998	6.8		23.375	26.1
	9.937499999999998	11.9		24.275	27.1
	9.918750000000001	13.3		24.418750000000003	28.2
	10.018749999999999	14.2		24.54375	27
	10.562499999999998	10.7		25.825	16.8
	11.16875	9		25.88125	14.5
	11.25625	8.4		25.18125	14.1
	10.424999999999999	11		25.1375	21.9
	11.724999999999998	11.5		26.7	23.6
	11.668750000000001	11		26.612499999999997	26.5
	11.625000000000002	12.6		25.9125	26.7
	11.09375	12.1		25.818749999999998	30.4
	10.89375	13.8		25.075000000000003	32.1
	11.137500000000001	11.3		27.131250000000005	26.6
	11.824999999999998	12.6		26.35625	29.2
	12.268749999999999	13.3		27.5875	33.3
	12.306249999999999	13.5		28.843750000000004	29.4
	12.775	12.8		28.724999999999998	32.6
	12.543750000000001	15.1		26.931250000000006	36.9
	12.18125	16.2		28.674999999999997	36.9
	13.15	16.1		27.993750000000002	35.3
	12.856250000000003	19.2		27.549999999999997	32.6
Jul.	12.15625	16.3		27.06875	31.9
	12.18125	16.9		28.062499999999996	34.1
	12.25	17.5		28.51875	34.5
	13.14375	14.9		29.056249999999995	35.2
	13.2375	17.5		28.868750000000006	33.5
	13.28125	14.7		29.28125	30.3
	13.275	16.4		28.55	32.8
	12.85	19.1		28.531250000000004	34.4
	13.14375	17.7		29.95	34.5
	13.406249999999996	16.6		29.306249999999995	36
	12.656250000000002	16.9		29.356249999999996	39.4
	13.50625	17.2		29.2125	35.6
	13.431250000000002	17.8		27.718750000000004	33.7
	13.23125	18.1		27.9875	34.1
	13.256249999999998	17		28.987499999999997	34.6
	14.031250000000002	17.9		30.118750000000002	35.2
	14.64375	15.8		30.66875	35.4
	14.793750000000001	16.5		30.06875	38.8
	14.331249999999999	17.4		28.7125	28.5
	13.9	11.6		28.98125	22.6
	13.625000000000002	8.5		27.625	26.3
	12.856250000000001	9.5		26.193749999999994	30.2
	12.512500000000003	11.1		27.618749999999995	32.2
	12.737499999999999	12.7		28.225	34
	12.61875	15.2		25.956250000000004	33.9
	12.0875	15.4		26.943749999999998	32.5
	12.706249999999999	14.4		27.79375	32.5
	13.1375	15		27.98125	32.4
	12.75625	14.5		28.0875	26.8
	12.93125	13.6		27.606250000000003	21.6
	12.881250000000001	12.8		28.018749999999997	21.8
Aug.	12.70625	10.3		27.9375	27.1
	12.281249999999998	9.3		28.05625	29.7
	12.349999999999998		6.5	27.23125		18.9
	12.64375		5.9	27.331249999999997		6.6
	12.218750000000002		5.7	27.612499999999997		6.4
	12.231250000000001		6.2	25.9375		7.6
	12.193750000000001		7.3	26.606249999999996		8.6
	11.65625		6.4	26.05		9.1
	11.2		4.9	25.593750000000004		7.4
	11.006250000000001		6.7	26.043749999999996		7.5
	10.70625		10.3	25.962500000000002		25.9
	11.568749999999998		11.6	26.2375		26.9
	11.106250000000001		11.5	25.262500000000003		26.4
	11.168750000000001		11.1	26.275000000000002		25.7
	11.043750000000001		11.2	26.531249999999996		26.9
	11.075000000000001		11.1	25.73125		25.6
	10.081249999999999		10.6	24.8875		24.9
	10.69375		10.7	25.406250000000004		26
	10.649999999999999		10.6	27.04375		26.7
	10.63125		10.7	25.725		25.6
	9.79375		9.7	23.368750000000002		23.2
	9.268749999999999		9.5	23.806250000000002		24.8
	9.45625		9.6	24.9375		24.7
	10.312500000000002		9.5	24.4625		23.7
	8.887500000000001		8.9	23.625000000000004		23.5
	8.837500000000002		8.7	21.30625		22
	8.549999999999999		8.9	22.50625		22.6
	8.25625		8.1	22.743750000000002		22
	7.65625		7.5	23.075000000000003		22
	8.518749999999999		8.6	20.90625		22
	7.4125		7.6	20.9		21.9
Sep.	7.35		7.8	21.6375		21.9
	8.05		8.4	21.537499999999998		21.7
	7.10625			20.6625
	7.83125			21.131249999999998
	7.5249999999999995			19.2625
	6.7			18.650000000000002
	6.249999999999999			19.40625
	6.1			19.199999999999996
	6.55			20.0375
	7.237500000000001			20.64375
	7.449999999999999			21.825000000000003
	7.15			21.2875
	6.4624999999999995			19.59375
	5.63125			18.625
	5.087500000000001			18.08125
	5.33125			17.587500000000002
	4.91875			15.956249999999999
	4.275			16.80625
	4.4312499999999995			15.29375
	2.8125000000000004			14.65625
	2.7250000000000005			15.0875
	3.11875			15.174999999999997
	3.58125			16.24375
	3.1750000000000003			15.7375
	2.59375			15.875
	2.88125			16.6625
	2.06875			12.331249999999999
	0.45			10.95
	0.1062499999999999			12.4375
	1.0562500000000001			13.200000000000003
Oct.	1.75			13.64375
	2.41875			14.90625
	2.1750000000000003			14.850000000000001
	1.075			13.199999999999998
	0.8125			13.53125
	1.7750000000000001			14.33125
	2.1375			13.7875
	1.8625			13.5125
	0.9375			10.025
	-0.98125			10.6875
	-0.7124999999999999			9.60625
	-2.7750000000000004			6.53125
	-3.4187499999999997			7
	-3.5062499999999996			9.00625
	-2.5374999999999996			7.96875
	-3.3187499999999996			8.01875
	-1.84375			10.33125
	-1.4749999999999999			8.993749999999999
	-2.25			8.16875
	-1.88125			7.35
	-1.8875			8.3125
	-1.4749999999999996			7.918749999999999
	-3.01875			6.675000000000001
	-4.331249999999999			5.9125000000000005
	-4.2375			6.293749999999998
	-4.84375			5.3062499999999995
	-6.799999999999999			3.3125
	-7.056250000000001			2.86875
	-6.325			4.106249999999999
	-4.60625			5.643750000000001
	-4.0562499999999995			5.15
Nov.	-4.30625			5.49375
	-5.75625			3.9625000000000004
	-7.168750000000001			2.7125
	-6.7437499999999995			2.9375000000000004
	-6.60625			2.9687499999999996
	-8.0375			2.1125
	-7.4125000000000005			3.2375000000000003
	-5.418749999999999			4.64375
	-6.375			2.38125
	-6.875000000000001			1.6812500000000004
	-7.75			1.7687499999999996
	-7.31875			2.58125
	-6.85			3.01875
	-6.862499999999999			1.9937500000000001
	-9.0375			0.5437500000000002
	-9.199999999999998			-0.12499999999999993
	-7.7250000000000005			1.56875
	-7.6187499999999995			1.4000000000000001
	-8.1625			0.49374999999999974
	-8.4125			0.6124999999999998
	-8.64375			0.29375000000000007
	-9.106250000000001			-0.36249999999999966
	-8.693750000000001			-0.39374999999999993
	-8.675			-0.02500000000000019
	-9.1875			-0.018750000000000155
	-7.6625000000000005			0.11249999999999993
	-6.837499999999999			0.6125
	-6.518749999999999			1.0875
	-6.518750000000001			0.7875
	-6.8625			0.5375
Dec.	-8.224999999999998			-0.5187499999999998
	-8.850000000000001			-1.1562500000000002
	-10.312500000000002			-1.9874999999999996
	-9.962499999999999			-1.03125
	-9.668750000000001			-1.5062500000000005
	-10.55625			-1.1374999999999997
	-8.756249999999998			-0.8687499999999999
	-9.94375			-1.5375
	-9.91875			-0.6562499999999998
	-8.85625			-0.9062500000000001
	-10.3			-2.4999999999999996
	-11.962500000000002			-3.3999999999999995
	-10.899999999999999			-3.075
	-9.81875			-1.6062500000000002
	-11.25			-2.6375000000000006
	-12.531249999999998			-3.875000000000001
	-13.040000000000001			-4.606666666666667

Max Temp.

Historic Max Temp.

Min Temp.

Historic Min Temp.

Yearly Summary 2026

39°C

Highest Temp

25 Jul. 26

-19°C

Lowest Temp

23 Jan. 26

Seasonal Breakdown

Hottest MonthJuly32.82°C

Coldest MonthJanuary-6.65°C

Wettest MonthAugust1.43mm

Windiest MonthMarch21.64km/h

Helena Climate Change InsightsSee how climate patterns are evolving over time. Temperature shifts, rainfall trends, and extreme events—all in one place.

Weather City Ranking GloballyExplore Real time of the world’s hottest & Coldest Cities based on current temperature data.

Frequently Asked Questions

1. What is the hottest month in Helena historically?

July is historically Helena's hottest month, with average maximum temperatures around 28°C. During peak heatwave events, the highest recorded temperatures have reached 39°C on 2026-07-25.

2. What is the coldest month in Helena historically?

February is Helena's coldest month, with average minimum temperatures around -10°C. The all-time record low of -39°C was recorded on 2022-12-22.

3. What is the average annual rainfall in Helena over the past 17 years?

Helena's average annual rainfall is approximately 401.04mm, based on records spanning 17 years.

4. How many rainy days does Helena experience on average per year?

Helena historically records approximately 152.4 rainy days per year. May has the highest number of rain days at an average of 19.5 days.

5. What is the all-time highest temperature ever recorded in Helena?

The all-time highest temperature recorded in Helena is 39°C on 2026-07-25.

6. What is the all-time lowest temperature ever recorded in Helena?

The all-time lowest temperature recorded in Helena is -39°C on 2022-12-22.

7. What is the windiest time of year in Helena historically?

Helena experiences its strongest winds during April. The historic gust record of 54.4 kph was recorded on 2025-12-17.

8. What is the highest and lowest humidity in Helena during a year?

Usually, Helena's humidity peaks in January at around 82.1% and drops to its lowest in August at approximately 44.6%.

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