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

Boulder Weather Trend Graph

Temperature (°C)

Months

Months	Historic Min Temp.	Min Temp.	Forecasted Min Temp.	Historic Max Temp.	Max Temp.	Forecasted Max Temp.
	-17.881249999999998	-5.1		-8.043750000000001	0.4
	-16.48125	-4.8		-6.5687500000000005	2
	-15.168750000000001	-6.4		-5.3687499999999995	-1.7
	-13.918750000000001	-1.3		-5.0375000000000005	0.8
	-13.99375	-5.5		-4.8500000000000005	-0.3
	-13.89375	-5.5		-4.55	0
	-13.95625	-7.1		-4.987500000000001	-0.2
	-14.743749999999999	-10.5		-4.96875	-4.5
	-13.9	-12.7		-4.8375	-7.5
	-14.093750000000002	-11.4		-5.0687500000000005	-2.9
	-14.787500000000001	-10.2		-5.6	-0.7
	-14.9875	-10.5		-6.0249999999999995	0.7
	-14.543750000000001	-8.6		-5.1125	1.8
	-14.637500000000001	-8.4		-4.7	-1.7
Jan.	-15.725	-9.8		-5.59375	1
	-14.756250000000001	-9.8		-4.71875	-5.1
	-13.793749999999998	-12.5		-3.95	-4.9
	-13.112499999999997	-9.4		-3.7874999999999996	-1.2
	-14.225	-12.6		-4.64375	-1
	-14.556249999999999	-12.5		-4.94375	-2.1
	-14.00625	-14.3		-4.31875	-3.2
	-15.118749999999997	-12.3		-5.025000000000001	-1.8
	-13.75625	-10.5		-4.45	-5.8
	-13.4625	-13.6		-4.300000000000001	-7.9
	-13.268749999999997	-14.5		-4.33125	-8.9
	-14.6	-17.9		-3.9062499999999996	-4.7
	-13.775	-13		-3.6750000000000003	-1.9
	-14.40625	-10.3		-3.41875	-2.3
	-13.31875	-12.3		-3.1374999999999997	-2.4
	-14.200000000000001	-10.5		-3.03125	-0.3
	-15.156249999999998	-10.3		-4.5375000000000005	1.4
	-14.118749999999999	-7.6		-4.80625	0.7
	-14.55625	-6.3		-4.36875	-0.4
	-12.812500000000002	-9.1		-2.7312499999999997	0.1
	-12.34375	-9.1		-2.9874999999999994	1.4
	-12.987499999999999	-5.8		-2.7625	4.2
	-12.187500000000002	-2.2		-2.83125	5.1
	-11.168749999999998	-2.8		-1.8875	4.7
	-12.43125	-4.8		-3.025000000000001	2.9
	-12.831249999999999	-2.9		-3.40625	1.5
	-12.7375	-3.9		-3.5500000000000003	-0.5
	-14.668750000000001	-4.1		-3.7437500000000004	3.1
	-13.249999999999998	-3.4		-2.75625	2.1
	-12.9375	-2.6		-1.8250000000000002	1.2
	-12.2375	-5.8		-2.44375	1.8
Feb.	-11.868750000000002	-3.5		-2.1374999999999997	4.3
	-12.80625	-2.7		-2.11875	4.3
	-13.774999999999999	-4		-3.5749999999999997	0
	-13.437500000000002	-7.9		-3.6374999999999997	-1.2
	-13.987499999999999	-9.1		-3.3812499999999996	-4.7
	-12.94375	-15.4		-3.9000000000000004	-4.2
	-13.19375	-16.3		-4.2375	-2.9
	-15.206249999999999	-13.3		-5.01875	1.5
	-16.362499999999997	-11.9		-5.05	2.8
	-15.406250000000002	-6.1		-4.249999999999999	3.3
	-14.631250000000001	-4.6		-3.8562500000000006	2.3
	-14.087500000000002	-3.6		-3.2125000000000004	1.7
	-14.043749999999998	-4.2		-2.6750000000000003	3.3
	-14.106250000000001	-5		-2.70625	4.2
	-12.80625	-1.3		-1.4812500000000002	4.1
	-11.2875	-1.5		-0.8374999999999998	5.1
	-10.73125	-2.5		-1.3875000000000002	5.1
	-12.406250000000002	-4.2		-1.76875	4.8
	-11.16875	-2.2		-1.0999999999999999	3.7
	-10.537500000000001	-3.6		-0.18125000000000008	1.5
	-10.11875	-3.9		-0.3437499999999999	2.5
	-9.5	-4.6		0.46875	5.1
	-9.98125	-3.2		0.19374999999999998	7.1
	-10.425	-5.5		0.9250000000000002	1.6
	-10.53125	-7.5		0.7875000000000001	0.6
	-9.881250000000001	-2		2.46875	6.7
	-7.856250000000001	-0.1		3.31875	6.3
	-7.1312500000000005	-2.3		3.025	5.5
Mar.	-6.550000000000001	-9.6		3.1875000000000004	-4.6
	-6.4125	-6.2		3.1937499999999996	5
	-7.0875	-2.1		2.5562499999999995	11.3
	-8.262500000000001	-0.3		1.5	14.5
	-8.3	-0.9		2.1437500000000007	16.9
	-8.231250000000001	-0.4		2.4312499999999995	17.6
	-8.10625	1.9		2.900000000000001	18.9
	-6.168750000000001	-0.5		2.9812499999999993	11.5
	-7.0125	1.5		2.6875	13.9
	-6.981249999999999	-0.4		3.4625	15.6
	-6.493750000000001	-1.3		3.40625	17.5
	-6.450000000000001	-0.2		3.68125	9.3
	-6.487500000000002	-2.2		4.48125	10.5
	-6.39375	-0.7		4.70625	16.9
	-5.3062499999999995	0.5		4.86875	16.4
	-4.9875	1.7		4.575000000000001	14.2
	-4.41875	-1		5.0625	11.3
	-4.5687500000000005	2.7		4.937499999999999	9.8
	-4.812500000000001	-3.9		4.29375	4.2
	-6.150000000000001	-5.6		3.45	4.1
	-5.599999999999999	-4.1		5.2875	7.8
	-4.1625000000000005	-3		6.81875	12.6
	-4.0249999999999995	0.7		5.312499999999999	13.4
	-4.7125	0.6		6.15625	14.1
	-4.05625	-1.5		6.55625	14
	-4.362500000000001	-1.2		6.2250000000000005	15.1
	-5.343750000000001	0.6		7.0875	17.2
	-2.1312500000000005	1.4		8.987499999999999	14.4
	-2.2125000000000004	-2		8.04375	11
	-3.95625	-1		5.6625	6.7
	-4.875	-2.6		5.4375	8.4
Apr.	-4.25625	-1.9		6.15625	9.6
	-3.3375	-6.5		7.075	4.6
	-3.6062499999999997	-6.9		6.018749999999999	1
	-4.45	-6.5		7.31875	9.4
	-3.8812499999999996	-1.4		7.39375	14.2
	-2.9875000000000007	4.3		8.4	18
	-2.31875	6.1		9.56875	19.4
	-1.5625	0.6		9.931250000000002	8.4
	-1.48125	-0.4		9.4	7.7
	-1.5937499999999996	-3.6		9.3375	5.1
	-1.0250000000000001	-5.3		10.175	8
	-0.3375	0.6		10.3375	6.3
	-0.4375	-3.3		10.531249999999998	5.8
	-1.7312499999999997	-2.7		9.049999999999999	7.4
	-1.3187499999999999	-2.7		8.95	9.1
	-1.4124999999999999	0.2		10.025	8.2
	-1.5562500000000001	-2.3		9.8	12.9
	-0.8125000000000002	2		10.343750000000002	16
	-0.8875000000000001	3.4		12.08125	16.7
	0.66875	3.9		12.781249999999998	16.1
	0.7875	-2.8		14.13125	6.8
	2	-3.9		13.806249999999999	11.3
	2.0999999999999996	2		12.6625	15.6
	0.6625	3.1		11.368749999999999	18.4
	0.6875	4		11.362499999999999	14.9
	0.7	2.3		11.8875	19.2
	1.5374999999999999	6.3		12.543750000000001	23.6
	1.575	7.9		13.881250000000001	24.5
	1.6374999999999997	10.5		14.737499999999999	25.3
	2.1875	4.1		14.90625	16.2
May	2.90625	3.7		15.818750000000001	17.3
	3.36875	1.5		15.518749999999997	15.5
	3.1937499999999996	-0.3		15.0375	8.4
	3.30625	-1.7		14.443750000000001	4.1
	3.2062499999999994	-7.6		12.556249999999999	5.7
	2.8875	-2.7		14.13125	11.7
	2.675	2.6		13.975	9.3
	2.60625	-2.4		14.674999999999999	12.7
	3.2687500000000003	2		14.3875	18.7
	2.8125	6.1		12.981250000000001	20
	2.1062499999999997	7.3		15.20625	21.6
	3.8625000000000003	9.3		16.15625	19.3
	4.2875000000000005	8		16.23125	22.5
	4.875	10.4		15.787500000000003	23.2
	4.3687499999999995	11.1		15.999999999999998	22.3
	4.06875	4.9		17.35	8.5
	4.95625	4		18.618750000000002	13.7
	5.8187500000000005	4.2		19	16.9
	6.268750000000001	4.1		19.425	20.4
	6.500000000000001	6.3		19.493750000000002	22.4
	6.50625	10.7		20.506249999999998	22.1
	7.85	6.9		21.587500000000002	23.6
	7.64375	11.6		22.775000000000002	26.3
	7.437500000000001	6.3		21.2	19.7
	7.8125	3.6		20.325	21
	7.1125	6.7		21.375	14.4
	6.725000000000001	1.4		20.650000000000002	14.5
	6.949999999999999	-1.7		19.975	18.3
	7.162500000000001	3.2		21.118750000000002	21.7
	7.699999999999998	6.4		20.8125	21.9
	7.9624999999999995	4.4		20.8375	20.3
Jun.	7.0874999999999995	5.8		21.76875	22.9
	7.750000000000001	8.7		21.706250000000004	25.3
	8.0375	9		19.956249999999997	23.3
	7.218750000000001	4.8		21.218750000000004	23.8
	8.13125	9		21.931249999999995	26.6
	6.975	8.4		20.675	24.3
	6.325	7		22.187500000000004	22.5
	7.981250000000001	7.9		21.800000000000004	25.1
	7.831249999999999	7.8		22.693749999999998	26.6
	9.09375	8.6		23.831249999999997	28
	9.75	9.7		24.768749999999994	22.2
	10.287499999999998	10.7		24.525	26.7
	10.35	7.3		25.131249999999998	16.1
	10.83125	4.6		26.2125	14.9
	10.881249999999998	2.3		24.81875	11
	10.4125	2.1		23.943749999999998	19.8
	10.63125	5.2		24.84375	21.6
	11.349999999999998	7.8		26.13125	22.8
	11.887499999999998	7.8		25.85	22.7
	11.79375	8.1		25.8	26.7
	11.512500000000001	12.2		25.49375	27.9
	11.574999999999998	14.5		25.843749999999996	29
	11.475000000000003	12.3		25.956250000000004	27.5
	11.899999999999999	11.6		25.7875	27.7
	11.825	12.4		26.7125	26.3
	12.45	10.4		26.368750000000002	28.3
	12.399999999999999	13.3		26.60625	31.1
	12.074999999999998	14.1		26.193749999999998	33.1
	12.14375	16.6		27.118749999999995	33.5
	12.40625	15.6		27.325	32.3
Jul.	12.674999999999999	15.1		26.374999999999996	28.6
	11.9375	13.8		26.95	29.1
	12.906249999999998	15.3		27.13125	28.5
	13.800000000000002	14.2		27.012499999999996	29.5
	13.549999999999999	14		27.824999999999996	31.4
	12.525	17.5		26.84375	32.3
	13.037499999999998	16.3		27.143750000000008	30.2
	12.949999999999998	15		27.231250000000003	28.2
	13.237499999999999	14.1		27.662500000000005	26.1
	12.96875	14.5		27.462500000000002	29.3
	12.9375	15.4		26.950000000000003	30.2
	12.875	16		27.35625	31.3
	12.993750000000002	17		26.60625	27.6
	12.768750000000002	13.1		26.68125	29.3
	12.59375	15.2		26.099999999999998	26.5
	12.38125	11		26.65	28.5
	12.487499999999999	13.3		26.893750000000004	29.9
	13.3625	13.6		26.525	31.8
	12.80625	14.9		26.287499999999994	32.1
	12.912499999999998	12.9		26.068749999999998	25.9
	12.743750000000002	7.1		26.4125	26.2
	12.393749999999999	7.7		25.500000000000004	27.4
	12.125000000000002	9.2		25.48125	29.7
	12.156250000000002	11.8		24.94375	31.7
	11.65625	13.2		24.418749999999996	31.1
	10.506250000000001	13.8		24.76875	30.6
	11.0375	13		25.6875	29.9
	11.699999999999998	12.4		26.23125	30.1
	12.024999999999999	14.3		25.64375	23.4
	11.70625	10.9		25.46875	20.4
	12.58125	9.4		25.599999999999998	21.5
Aug.	11.731249999999998	8.9		25.9875	23.5
	11.225000000000001		9.7	26.13125		25.2
	11.13125		11	26.54375		25.8
	11.868749999999999		13	26.224999999999998		23.1
	11.59375		9.5	24.599999999999994		24.3
	11.668750000000001		9.8	24.962500000000002		26.8
	11.937499999999998		12.3	25.231249999999996		29.8
	12.049999999999999		13.9	25.193749999999998		32.1
	10.806249999999999		10.7	24.081250000000004		23.6
	10.4625		10.4	24.3375		24
	11.19375		10.8	24.668750000000003		24
	10.89375		10.6	23.943749999999998		23.9
	10.76875		10.9	22.974999999999998		23.8
	10.39375		10.5	24.043750000000003		24.2
	10.26875		10	24.812499999999996		24.9
	10.30625		10.6	24.24375		24.1
	10.062500000000002		10	23.912499999999998		23.4
	10.16875		9.9	23.493750000000002		23.9
	9.893749999999999		9.9	24.2125		24.6
	10.312499999999998		10.3	24.30625		24.2
	9.837500000000002		9.7	23.9875		23.7
	9.4625		9.1	22.912499999999998		23.1
	8.737499999999999		9	22.768750000000004		22.9
	9.456249999999999		9	23.568749999999998		23.3
	9.2		8.6	22.450000000000003		21.2
	7.912499999999999		7.5	20.750000000000004		21.3
	7.543749999999999		7.8	20.568749999999994		21
	7.331250000000001		7.6	20.18125		21
	7.0249999999999995		6.6	21.49375		20.4
	7.66875		7.1	20.35625		20.7
	7.537499999999999		7.9	20.437500000000004		20.9
Sep.	7.4125000000000005		7.5	20.087500000000002		20
	7.31875			19.7875
	6.787499999999999			19.331249999999997
	6.44375			19.318749999999998
	6.3625			19.5125
	5.6375			17.9125
	5.568749999999999			18.6875
	5.5			18.2625
	5.175			18.362499999999997
	4.743749999999999			18.724999999999998
	5.500000000000001			18.9375
	5.6625			19.7375
	6.0875			18.831249999999997
	5.556250000000001			18.275
	5.337499999999999			17.4375
	5.662500000000001			17.675
	4.5562499999999995			16.537499999999998
	4.375			15.89375
	3.5812500000000007			15.96875
	3.21875			13.987499999999999
	1.9687499999999996			13.862500000000002
	2.28125			12.9875
	1.7125000000000004			13.831249999999999
	1.5937500000000002			13.61875
	1.0125			13.393749999999999
	1.71875			13.006250000000001
	2.20625			13.568749999999998
	0.7312500000000002			11.04375
	-0.21874999999999994			11.937499999999998
	0.7499999999999999			12.174999999999999
Oct.	0.3500000000000001			12.499999999999998
	0.66875			12.937499999999998
	0.6749999999999999			12.943750000000003
	0.5562500000000001			11.112499999999999
	-0.21250000000000002			11.7875
	-0.41250000000000003			11.325000000000003
	-0.5125000000000001			11.3625
	-0.06875000000000003			11.80625
	0.5249999999999999			10.15625
	-1.23125			10.206249999999999
	-0.6125			9.8
	-3.25625			5.81875
	-4.56875			5.3
	-3.9812499999999997			6.8875
	-3.0562499999999995			7.293749999999999
	-3.4			6.593749999999999
	-2.825			7.88125
	-2.4375			7.375000000000002
	-2.33125			7.0687500000000005
	-2.625			6.331250000000001
	-3.687500000000001			6.24375
	-3.431250000000001			6.262499999999999
	-3.7562499999999996			5.8375
	-3.8500000000000005			5.15625
	-4.05			5.156250000000001
	-4.699999999999999			5.4125
	-5.168749999999999			3.9499999999999993
	-7.531249999999999			2.0250000000000004
	-7.04375			2.15
	-6.287499999999999			3.2999999999999994
	-5.3375			4.0874999999999995
Nov.	-5.45			3.3937499999999994
	-6.28125			2.575
	-7.15			1.48125
	-8.49375			1.0375
	-7.5875			1.56875
	-7.9312499999999995			1.2937499999999997
	-8.8			0.30625
	-7.99375			1.5937499999999998
	-8.53125			0.8125000000000001
	-9.75			-0.725
	-10.643749999999999			-0.8812499999999999
	-10.593749999999998			-1.4
	-9.6875			-0.51875
	-8.868749999999999			-0.35625
	-10.1625			-1.71875
	-12.406250000000002			-2.0687499999999996
	-11.7875			-2.0124999999999997
	-10.893749999999999			-1.4562499999999998
	-11.712499999999999			-1.84375
	-12.499999999999998			-2.7625
	-12.31875			-3.04375
	-12.668750000000001			-2.9625000000000004
	-12.2875			-2.537499999999999
	-11.299999999999999			-2.14375
	-12.937499999999998			-2.9125
	-12.487500000000002			-3.0124999999999997
	-10.85625			-2.5625
	-10.25			-1.4937500000000004
	-10.5875			-2.1875
	-11.649999999999999			-3.1312499999999996
Dec.	-12.768750000000002			-3.6999999999999997
	-13.787500000000001			-4.26875
	-15.1625			-5.025000000000001
	-13.406250000000004			-4.5249999999999995
	-12.731250000000001			-4.2875000000000005
	-12.7375			-3.625
	-11.4625			-2.7
	-13.274999999999999			-3.8250000000000006
	-13.656249999999998			-3.2124999999999995
	-12.968750000000004			-4.56875
	-11.818750000000001			-3.4875
	-14.381250000000001			-5.2437499999999995
	-15.418750000000001			-6.25625
	-15.76875			-6.487499999999999
	-16.34375			-6.443749999999999
	-15.912500000000001			-6.543749999999999
	-18.12			-7.640000000000001

Max Temp.

Historic Max Temp.

Min Temp.

Historic Min Temp.

Yearly Summary 2026

34°C

Highest Temp

13 Jul. 26

-18°C

Lowest Temp

26 Jan. 26

Seasonal Breakdown

Hottest MonthJuly28.61°C

Coldest MonthJanuary-10.13°C

Wettest MonthMay2.18mm

Windiest MonthJune34.56km/h

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Frequently Asked Questions

1. What is the hottest month in Boulder historically?

July is historically Boulder's hottest month, with average maximum temperatures around 27°C. During peak heatwave events, the highest recorded temperatures have reached 34°C on 2026-07-13.

2. What is the coldest month in Boulder historically?

January is Boulder's coldest month, with average minimum temperatures around -14°C. The all-time record low of -32°C was recorded on 2022-12-22.

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

Boulder's average annual rainfall is approximately 306.8mm, based on records spanning 17 years.

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

Boulder historically records approximately 142.6 rainy days per year. May has the highest number of rain days at an average of 20.3 days.

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

The all-time highest temperature recorded in Boulder is 34°C on 2026-07-13.

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

The all-time lowest temperature recorded in Boulder is -32°C on 2022-12-22.

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

Boulder experiences its strongest winds during June. The historic gust record of 61.2 kph was recorded on 2025-12-17.

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

Usually, Boulder's humidity peaks in January at around 84.9% and drops to its lowest in July at approximately 34.9%.

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Analyse hottest, coldest, windiest & wettest days