Shreveport
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Shreveport clear sky chart from 2005-11-06 to 2024-11-10.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	13% 6% 2 6% 4 4 4 4 6% 7% 44%	101093
	Night	12% 6% 2 5% 4 3 4 3 5% 7% 49%	98129
Transparency	Day	37% 6% 10% 21% 19% 6%	104739
	Night	34% 5% 10% 20% 22% 9%	102623
Seeing	Day	13% 6% 19% 25% 26% 11%	15155
	Night	14% 5% 22% 34% 22% 3	24939

By Month

Percentage Cloud Cover SE (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	18% 12% 3 5% 3 3 2 2 4 6% 41%	2847
	11th to 20th	Day	21% 6% 2 4 3 2 3 3 4 6% 47%	2850
	21st to end	Day	22% 7% 2 5% 3 3 3 2 4 5% 43%	3135
February	1st to 10th	Day	21% 10% 4 6% 4 4 3 3 3 4 39%	1710
	11th to 20th	Day	20% 8% 2 6% 4 4 4 2 4 6% 40%	1806
	21st to end	Day	23% 8% 3 6% 4 4 3 2 4 5% 39%	1727
March	1st to 10th	Day	18% 12% 4 9% 5% 4 4 3 4 5% 33%	3436
	11th to 20th	Day	19% 8% 2 6% 4 4 4 3 5% 6% 36%	3480
	21st to end	Day	15% 9% 3 8% 4 4 4 3 4 5% 40%	3814
April	1st to 10th	Day	13% 7% 2 6% 5% 5% 4 3 5% 6% 44%	2185
	11th to 20th	Day	15% 8% 2 6% 5% 4 4 4 5% 7% 40%	2254
	21st to end	Day	11% 6% 2 6% 5% 5% 5% 3 5% 6% 46%	2280
May	1st to 10th	Day	16% 7% 3 8% 5% 5% 5% 3 6% 7% 35%	3765
	11th to 20th	Day	13% 6% 3 6% 4 4 5% 4 5% 7% 44%	4068
	21st to end	Day	12% 7% 3 7% 5% 5% 5% 5% 7% 9% 36%	4477
June	1st to 10th	Day	7% 5% 2 6% 6% 6% 6% 5% 7% 10% 40%	2470
	11th to 20th	Day	5% 4 2 5% 6% 6% 6% 5% 8% 10% 43%	2470
	21st to end	Day	5% 4 2 5% 5% 5% 5% 6% 8% 10% 45%	2470
July	1st to 10th	Day	9% 5% 2 6% 6% 6% 6% 5% 8% 11% 38%	4120
	11th to 20th	Day	7% 4 2 5% 5% 5% 6% 4 8% 10% 43%	4120
	21st to end	Day	15% 10% 3 8% 5% 4 5% 4 6% 8% 33%	4465
August	1st to 10th	Day	2 2 1 3 3 3 3 3 5% 8% 68%	4104
	11th to 20th	Day	4 2 1 4 3 4 5% 4 7% 11% 54%	3790
	21st to end	Day	7% 5% 3 6% 5% 6% 6% 5% 7% 9% 41%	4180
September	1st to 10th	Day	8% 5% 2 5% 4 5% 5% 4 6% 8% 47%	2280
	11th to 20th	Day	12% 6% 2 5% 5% 5% 5% 4 7% 7% 43%	2128
	21st to end	Day	7% 4 2 4 5% 4 4 3 6% 7% 54%	2051
October	1st to 10th	Day	7% 3 2 4 3 3 4 3 5% 7% 61%	1900
	11th to 20th	Day	13% 5% 2 4 3 2 4 2 4 6% 55%	1900
	21st to end	Day	16% 5% 2 4 3 2 3 3 3 4 55%	2090
November	1st to 10th	Day	13% 6% 2 4 4 4 3 4 5% 7% 49%	1948
	11th to 20th	Day	11% 6% 3 5% 4 3 3 3 4 5% 52%	1900
	21st to end	Day	19% 7% 2 6% 3 4 3 3 4 5% 44%	1867
December	1st to 10th	Day	14% 8% 3 7% 3 3 3 3 4 6% 45%	1710
	11th to 20th	Day	16% 9% 2 5% 4 4 4 3 5% 5% 42%	2161
	21st to end	Day	15% 9% 3 7% 4 3 4 3 4 5% 41%	3135
January	1st to 10th	Night	16% 7% 3 7% 3 3 3 2 4 5% 48%	4108
	11th to 20th	Night	18% 6% 2 4 3 2 2 2 4 5% 52%	4120
	21st to end	Night	24% 8% 2 6% 3 3 2 2 3 3 44%	4532
February	1st to 10th	Night	16% 8% 2 5% 3 3 3 3 4 6% 45%	2470
	11th to 20th	Night	21% 7% 2 5% 4 3 3 3 3 5% 44%	2273
	21st to end	Night	20% 7% 2 6% 4 3 3 2 3 5% 45%	1727
March	1st to 10th	Night	19% 10% 3 6% 4 4 4 3 4 6% 36%	3419
	11th to 20th	Night	18% 7% 2 6% 4 4 4 4 6% 7% 37%	3480
	21st to end	Night	12% 7% 2 7% 5% 4 4 4 6% 6% 44%	3817
April	1st to 10th	Night	11% 4 2 4 4 4 5% 4 5% 7% 49%	1994
	11th to 20th	Night	11% 6% 3 5% 5% 3 4 4 6% 8% 46%	1875
	21st to end	Night	11% 6% 2 5% 4 3 4 2 5% 8% 51%	1900
May	1st to 10th	Night	12% 8% 3 8% 5% 4 4 4 7% 7% 38%	3130
	11th to 20th	Night	13% 7% 2 7% 4 4 3 3 6% 8% 44%	2833
	21st to end	Night	11% 6% 2 6% 4 4 5% 4 7% 8% 44%	3090
June	1st to 10th	Night	4 4 2 5% 4 4 4 5% 6% 12% 51%	1710
	11th to 20th	Night	4 3 1 4 4 4 4 4 5% 11% 55%	1710
	21st to end	Night	5% 4 2 5% 4 4 3 4 7% 9% 53%	1710
July	1st to 10th	Night	6% 5% 2 5% 5% 4 5% 5% 8% 12% 41%	2850
	11th to 20th	Night	4 3 2 5% 3 3 5% 5% 6% 12% 51%	2850
	21st to end	Night	13% 8% 3 6% 4 4 3 3 6% 9% 41%	3098
August	1st to 10th	Night	2 1 2 2 1 3 3 5% 8% 73%	2836
	11th to 20th	Night	3 2 1 3 3 3 4 5% 7% 11% 58%	3037
	21st to end	Night	5% 3 2 6% 5% 5% 5% 5% 7% 8% 49%	3476
September	1st to 10th	Night	7% 4 2 6% 4 4 4 3 6% 8% 52%	1900
	11th to 20th	Night	11% 4 2 5% 4 4 4 4 6% 7% 49%	2046
	21st to end	Night	7% 3 1 4 3 4 4 3 5% 7% 59%	2109
October	1st to 10th	Night	6% 3 1 4 3 3 3 3 5% 6% 62%	2280
	11th to 20th	Night	10% 5% 1 5% 3 2 3 2 4 5% 60%	2280
	21st to end	Night	14% 4 1 4 3 4 3 2 3 4 58%	2508
November	1st to 10th	Night	12% 5% 2 4 3 3 3 2 4 5% 56%	2335
	11th to 20th	Night	10% 6% 2 5% 4 3 3 3 4 5% 54%	2280
	21st to end	Night	14% 7% 2 6% 4 3 3 3 5% 5% 48%	2308
December	1st to 10th	Night	17% 6% 2 5% 4 3 4 3 5% 6% 46%	2470
	11th to 20th	Night	15% 8% 3 5% 4 4 4 3 4 4 47%	3036
	21st to end	Night	16% 8% 2 5% 4 3 3 3 4 5% 48%	4532

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	46% 2 5% 16% 26% 4	2848
	11th to 20th	Day	39% 3 9% 23% 21% 4	2850
	21st to end	Day	45% 3 5% 16% 20% 11%	3135
February	1st to 10th	Day	50% 4 6% 15% 16% 9%	1710
	11th to 20th	Day	48% 4 6% 15% 20% 7%	1815
	21st to end	Day	49% 4 7% 10% 21% 10%	1727
March	1st to 10th	Day	54% 4 7% 12% 18% 5%	3436
	11th to 20th	Day	48% 5% 6% 21% 16% 5%	3480
	21st to end	Day	46% 4 8% 17% 23% 2	3814
April	1st to 10th	Day	41% 5% 7% 21% 17% 8%	2185
	11th to 20th	Day	43% 6% 8% 16% 19% 8%	2254
	21st to end	Day	38% 7% 9% 20% 23% 4	2280
May	1st to 10th	Day	46% 7% 9% 23% 11% 3	3800
	11th to 20th	Day	40% 6% 9% 22% 22% 2	4072
	21st to end	Day	42% 9% 13% 23% 10% 3	4489
June	1st to 10th	Day	35% 10% 14% 24% 15% 1	2470
	11th to 20th	Day	31% 9% 15% 25% 17% 3	2470
	21st to end	Day	30% 10% 15% 26% 16% 3	2470
July	1st to 10th	Day	37% 11% 21% 25% 7% 1	4056
	11th to 20th	Day	32% 9% 16% 30% 13% 1	4051
	21st to end	Day	47% 8% 13% 22% 9%	4325
August	1st to 10th	Day	15% 6% 15% 31% 29% 5%	4090
	11th to 20th	Day	23% 7% 20% 36% 13% 1	3827
	21st to end	Day	36% 9% 14% 19% 20% 1	4179
September	1st to 10th	Day	34% 8% 13% 18% 18% 9%	2280
	11th to 20th	Day	38% 8% 12% 17% 18% 6%	2128
	21st to end	Day	28% 5% 10% 22% 25% 10%	2051
October	1st to 10th	Day	15% 3 7% 13% 25% 38%	3160
	11th to 20th	Day	19% 2 5% 16% 32% 26%	3140
	21st to end	Day	27% 4 4 19% 33% 12%	3428
November	1st to 10th	Day	34% 6% 9% 18% 23% 10%	1948
	11th to 20th	Day	34% 5% 6% 17% 27% 11%	1900
	21st to end	Day	43% 4 5% 17% 23% 7%	1867
December	1st to 10th	Day	41% 5% 9% 19% 19% 8%	1710
	11th to 20th	Day	44% 4 6% 14% 24% 7%	2159
	21st to end	Day	45% 4 6% 15% 25% 5%	3135
January	1st to 10th	Night	39% 4 6% 15% 30% 7%	4108
	11th to 20th	Night	37% 4 6% 19% 27% 8%	4120
	21st to end	Night	48% 3 6% 14% 20% 9%	4532
February	1st to 10th	Night	41% 4 7% 18% 19% 11%	2470
	11th to 20th	Night	44% 3 7% 15% 21% 9%	2274
	21st to end	Night	44% 3 7% 14% 17% 14%	1727
March	1st to 10th	Night	49% 5% 7% 13% 18% 8%	3419
	11th to 20th	Night	45% 5% 9% 15% 19% 6%	3480
	21st to end	Night	38% 6% 11% 17% 25% 4	3817
April	1st to 10th	Night	33% 6% 11% 21% 17% 11%	1994
	11th to 20th	Night	35% 6% 10% 18% 19% 12%	1875
	21st to end	Night	33% 5% 10% 23% 26% 4	1900
May	1st to 10th	Night	41% 8% 11% 21% 13% 5%	3160
	11th to 20th	Night	37% 7% 11% 21% 21% 3	2834
	21st to end	Night	36% 8% 15% 25% 14% 2	3099
June	1st to 10th	Night	25% 9% 16% 29% 19% 2	1710
	11th to 20th	Night	24% 7% 16% 29% 20% 5%	1710
	21st to end	Night	26% 7% 15% 24% 24% 4	1710
July	1st to 10th	Night	32% 10% 25% 26% 6% 1	2805
	11th to 20th	Night	23% 8% 21% 32% 14% 2	2796
	21st to end	Night	41% 6% 18% 24% 10% 1	2999
August	1st to 10th	Night	11% 5% 16% 32% 31% 5%	2826
	11th to 20th	Night	18% 6% 17% 42% 14% 2	3066
	21st to end	Night	30% 9% 15% 23% 22% 2	3476
September	1st to 10th	Night	30% 7% 15% 19% 18% 11%	1900
	11th to 20th	Night	33% 7% 12% 19% 20% 10%	2046
	21st to end	Night	25% 5% 10% 20% 27% 12%	2109
October	1st to 10th	Night	15% 3 5% 14% 20% 42%	3800
	11th to 20th	Night	17% 2 4 15% 32% 29%	3779
	21st to end	Night	24% 3 5% 16% 35% 16%	4120
November	1st to 10th	Night	31% 4 9% 16% 27% 12%	2335
	11th to 20th	Night	32% 4 8% 16% 25% 14%	2280
	21st to end	Night	38% 4 6% 18% 24% 10%	2308
December	1st to 10th	Night	38% 6% 10% 18% 20% 8%	2470
	11th to 20th	Night	41% 4 6% 13% 24% 11%	3037
	21st to end	Night	40% 3 7% 17% 26% 7%	4532

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	19% 14% 39% 19% 10%	270
	11th to 20th	Day	27% 13% 33% 21% 6% 1	270
	21st to end	Day	21% 14% 38% 22% 6%	297
February	1st to 10th	Day	27% 11% 31% 24% 6% 1	270
	11th to 20th	Day	29% 16% 36% 16% 4	270
	21st to end	Day	31% 20% 35% 12% 1	225
March	1st to 10th	Day	23% 16% 33% 21% 7%	270
	11th to 20th	Day	18% 20% 32% 24% 4 1	270
	21st to end	Day	16% 19% 37% 20% 6% 1	297
April	1st to 10th	Day	18% 13% 37% 23% 8% 1	365
	11th to 20th	Day	19% 14% 29% 23% 14% 1	452
	21st to end	Day	15% 9% 29% 32% 14% 2	460
May	1st to 10th	Day	15% 8% 29% 33% 14% 1	463
	11th to 20th	Day	14% 5% 21% 34% 21% 5%	661
	21st to end	Day	10% 6% 20% 34% 25% 6%	734
June	1st to 10th	Day	8% 2 10% 32% 37% 12%	680
	11th to 20th	Day	4 2 12% 30% 39% 12%	680
	21st to end	Day	6% 1 10% 27% 38% 19%	680
July	1st to 10th	Day	8% 1 7% 24% 39% 20%	671
	11th to 20th	Day	5% 1 6% 22% 40% 25%	668
	21st to end	Day	8% 1 5% 24% 43% 20%	739
August	1st to 10th	Day	5% 5% 18% 48% 24%	676
	11th to 20th	Day	7% 1 4 17% 48% 22%	516
	21st to end	Day	12% 2 4 17% 35% 30%	539
September	1st to 10th	Day	9% 1 7% 19% 37% 27%	490
	11th to 20th	Day	11% 1 7% 25% 32% 25%	338
	21st to end	Day	8% 3 8% 29% 36% 16%	300
October	1st to 10th	Day	6% 2 16% 32% 32% 12%	300
	11th to 20th	Day	9% 6% 26% 32% 18% 8%	300
	21st to end	Day	22% 8% 25% 24% 14% 7%	330
November	1st to 10th	Day	14% 6% 27% 27% 22% 3	297
	11th to 20th	Day	13% 9% 31% 30% 14% 2	270
	21st to end	Day	19% 12% 30% 22% 14% 1	270
December	1st to 10th	Day	16% 10% 39% 23% 10% 3	270
	11th to 20th	Day	21% 11% 32% 26% 8% 1	270
	21st to end	Day	18% 15% 39% 20% 6% 2	297
January	1st to 10th	Night	21% 7% 32% 33% 7%	950
	11th to 20th	Night	22% 9% 32% 28% 8% 1	950
	21st to end	Night	22% 7% 34% 33% 4	1045
February	1st to 10th	Night	20% 9% 33% 32% 5%	950
	11th to 20th	Night	25% 8% 34% 29% 5%	799
	21st to end	Night	24% 12% 36% 24% 3	471
March	1st to 10th	Night	19% 7% 32% 36% 6%	570
	11th to 20th	Night	17% 9% 32% 34% 6% 1	570
	21st to end	Night	16% 6% 36% 35% 7%	627
April	1st to 10th	Night	12% 9% 37% 33% 8%	570
	11th to 20th	Night	12% 10% 35% 30% 12% 1	563
	21st to end	Night	13% 7% 35% 32% 12% 1	570
May	1st to 10th	Night	10% 6% 32% 38% 13% 1	570
	11th to 20th	Night	12% 4 22% 41% 19% 2	561
	21st to end	Night	7% 3 19% 41% 26% 4	617
June	1st to 10th	Night	4 1 9% 42% 40% 4	570
	11th to 20th	Night	3 3 8% 41% 42% 3	570
	21st to end	Night	5% 1 9% 33% 44% 8%	570
July	1st to 10th	Night	5% 1 3 31% 50% 10%	555
	11th to 20th	Night	3 1 4 30% 52% 10%	552
	21st to end	Night	4 1 5% 28% 51% 11%	624
August	1st to 10th	Night	3 1 3 25% 57% 11%	567
	11th to 20th	Night	5% 1 4 28% 55% 8%	564
	21st to end	Night	7% 2 4 27% 49% 11%	627
September	1st to 10th	Night	7% 1 5% 31% 47% 8%	570
	11th to 20th	Night	11% 1 6% 29% 45% 7%	570
	21st to end	Night	8% 2 8% 36% 41% 5%	589
October	1st to 10th	Night	7% 1 10% 40% 37% 5%	760
	11th to 20th	Night	12% 3 19% 40% 23% 2	760
	21st to end	Night	15% 5% 23% 37% 19% 3	836
November	1st to 10th	Night	13% 3 22% 39% 21% 2	779
	11th to 20th	Night	11% 7% 25% 41% 16% 1	760
	21st to end	Night	17% 8% 28% 31% 14% 1	788
December	1st to 10th	Night	17% 7% 28% 37% 10%	950
	11th to 20th	Night	21% 7% 29% 35% 8%	950
	21st to end	Night	20% 7% 32% 31% 9%	1045

Page generated at 2024-11-07 05:55:45. Version ac07

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