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Welcome to the "Colorado lightning flash by hour" webpage of the "Colorado Flash Density Maps" section of the  Colorado Lightning Resource Page.

NOTE: depending on which browser you are using, you may have to scroll down all the way to the bottom to see the monthly data

This page shows the number of lightning flashes per hour for each month of the year for the state of Colorado. The average number of lightning flashes for each day of the month are also shown. Note: The table below does not account for the year to year changes in the detection efficiencies of the NLDN, so the values in the table are higher than shown by ~15%. If you wish to find out more about this, click here.

Example: between the time 22-23Z in the month of July, there are typically 523.0 lightning flashes across the state of Colorado.  Time in the table below is in "Z" time, or UTC time. During the Summer in Colorado, 12Z = 6am MDT, 00Z = 6 pm MDT.

HR (z)	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV		DEC
12z	0.1	0.1	0.3	1.6	5.0	9.6	5.6	19.8	13.0	3.9	0.1		0
13z	0	0.1	0.3	1.4	4.8	9.1	3.8	16.6	13.6	2.9	0.1		0
14z	0	0	0.3	1.3	5.1	6.7	3.6	12.9	14.4	3.0	0.1		0
15z	0	0	0.1	1.6	5.7	6.8	3.3	12.9	14.5	4.3	0.1		0
16z	0	0	0.1	2.5	11.0	14.1	8.2	14.9	14.9	4.4	0.1		0
17z	0	0	0.4	4.8	27.7	46.0	39.3	45.3	24.9	5.6	0.4		0
18z	0	0.1	1.3	10.3	60.7	114.4	130.8	138.5	54.9	8.2	0.5		0
19z	0	0.3	2.9	16.4	97.2	187.3	272.9	272.4	96.3	12.8	0.9		0
20z	0	0.5	4.7	21.8	132.4	239.4	396.1	377.4	137.2	15.5	0.9		0
21z	0	0.7	5.2	25.5	146.6	286.5	479.3	464.3	150.3	20.9	0.9		0.1
22z	0	0.6	5.8	25.7	151.7	300.9	523.0	521.2	165.9	22.9	0.9		0.1
23z	0.1	0.6	5.4	22.2	136.2	298.8	505.0	521.5	154.9	21.7	1.0		0
00z	0.1	0.3	3.8	21.2	105.7	278.0	433.5	486.5	146.3	25.7	0.7		0.1
01z	0	0.2	2.3	17.5	87.8	223.9	358.1	388.4	112.6	21.8	0.7		0.1
02z	0.1	0.1	1.4	11.5	66.9	166.7	279.5	286.9	87.9	20.2	1.0		0
03z	0	0.1	0.9	8.4	51.4	117.3	198.2	195.4	66.7	13.3	0.9		0.1
04z	0.1	0.1	0.8	7.3	34.8	84.0	144.3	134.0	51.1	11.3	0.6		0
05z	0.1	0.1	0.6	7.2	22.3	64.7	91.1	91.4	37.4	10.9	0.4		0
06z	0.1	0	0.6	5.4	15.7	51.7	59.9	65.1	26.4	7.4	0.1		0
07z	0.4	0	0.4	3.1	11.4	39.3	36.1	48.4	19.5	5.6	0.2		0
08z	0.1	0	0.4	2.3	8.4	27.9	26.3	35.7	15.6	5.8	0.2		0
09z	0.1	0	0.6	2.0	5.6	19.5	16.2	27.5	14.2	4.4	0.1		0
10z	0.1	0	0.5	1.7	5.1	15.7	12.1	19.9	12.4	4.3	0.2		0
11z	0	0.1	0.2	1.8	4.2	12.8	8.6	18.5	11.8	4.4	0.2		0

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The average number of lightning flashes for any given day for each month are shown below:

            Month ............. # Flashes
                                        per day             

            January ................... 1
            February ................. 4
            March .................... 39
            April ..................... 225
            May .................... 1203
            June .................. 2621
            July .................... 4035
            August ............... 4215
            September ....... 1457
            October.................261
            November ..............11
            December ................1

Example...in any given day in July, you can expect 4035 lightning flashes to occur in the state of Colorado.


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