Deep South Regional Star Gaze
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Deep South Regional Star Gaze 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	12% 7% 3 7% 5% 5% 5% 4 6% 7% 39%	100342
	Night	13% 7% 2 6% 4 4 4 4 6% 8% 44%	98808
Transparency	Day	22% 47% 6% 10% 10% 4	103993
	Night	21% 47% 6% 10% 10% 5%	103297
Seeing	Day	15% 8% 20% 25% 22% 10%	14917
	Night	15% 7% 22% 29% 21% 5%	24623

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	17% 8% 3 6% 4 3 3 3 5% 7% 40%	2847
	11th to 20th	Day	15% 7% 2 5% 3 3 3 2 3 5% 53%	2850
	21st to end	Day	24% 9% 3 5% 3 3 4 3 4 5% 37%	3180
February	1st to 10th	Day	18% 9% 3 6% 5% 4 4 4 4 5% 38%	1900
	11th to 20th	Day	19% 8% 3 5% 5% 4 3 3 4 6% 40%	1848
	21st to end	Day	17% 9% 3 6% 5% 5% 4 4 6% 5% 36%	1570
March	1st to 10th	Day	23% 10% 3 8% 5% 4 4 3 5% 7% 27%	3401
	11th to 20th	Day	16% 8% 3 8% 6% 5% 4 5% 6% 7% 32%	3480
	21st to end	Day	14% 7% 3 7% 6% 5% 5% 3 4 6% 41%	3927
April	1st to 10th	Day	11% 7% 3 7% 5% 5% 5% 4 6% 7% 42%	2280
	11th to 20th	Day	16% 7% 3 7% 5% 4 4 4 6% 7% 38%	2254
	21st to end	Day	9% 6% 2 6% 5% 4 5% 5% 7% 7% 43%	2280
May	1st to 10th	Day	13% 7% 3 7% 6% 6% 6% 5% 6% 8% 32%	3765
	11th to 20th	Day	15% 6% 2 7% 5% 4 5% 4 5% 7% 40%	3764
	21st to end	Day	7% 5% 2 7% 6% 6% 6% 5% 8% 10% 39%	4129
June	1st to 10th	Day	9% 5% 3 8% 7% 7% 7% 6% 8% 10% 30%	2425
	11th to 20th	Day	7% 5% 2 7% 7% 8% 7% 7% 8% 9% 34%	2470
	21st to end	Day	7% 6% 3 7% 8% 8% 8% 7% 8% 10% 29%	2470
July	1st to 10th	Day	5% 7% 3 10% 9% 8% 9% 7% 8% 10% 24%	4120
	11th to 20th	Day	7% 6% 3 9% 8% 8% 9% 7% 10% 11% 23%	4120
	21st to end	Day	11% 10% 4 11% 8% 7% 6% 5% 6% 8% 25%	4316
August	1st to 10th	Day	3 3 2 5% 4 5% 4 4 6% 9% 55%	3785
	11th to 20th	Day	6% 4 2 6% 5% 6% 6% 6% 9% 10% 40%	3729
	21st to end	Day	10% 7% 3 8% 6% 7% 6% 5% 6% 7% 36%	4180
September	1st to 10th	Day	11% 6% 2 8% 5% 6% 7% 5% 8% 8% 33%	2280
	11th to 20th	Day	13% 6% 3 7% 5% 6% 4 4 6% 8% 38%	2271
	21st to end	Day	9% 6% 2 5% 4 4 4 4 5% 6% 51%	2090
October	1st to 10th	Day	7% 3 2 5% 4 5% 4 3 6% 7% 55%	1901
	11th to 20th	Day	9% 4 1 4 4 3 4 3 4 6% 57%	1900
	21st to end	Day	10% 5% 2 5% 4 3 3 2 4 5% 57%	2090
November	1st to 10th	Day	10% 6% 2 6% 3 4 4 4 4 6% 51%	1948
	11th to 20th	Day	11% 5% 2 7% 4 4 3 3 5% 5% 51%	1900
	21st to end	Day	13% 7% 3 5% 4 4 5% 3 5% 6% 45%	1733
December	1st to 10th	Day	15% 8% 3 6% 4 4 3 3 5% 7% 42%	1710
	11th to 20th	Day	16% 8% 3 7% 5% 4 4 3 5% 5% 40%	2294
	21st to end	Day	16% 7% 2 7% 4 4 4 3 6% 6% 41%	3135
January	1st to 10th	Night	19% 7% 2 4 3 3 3 3 4 5% 45%	4108
	11th to 20th	Night	17% 6% 2 5% 3 3 3 3 3 5% 51%	4120
	21st to end	Night	28% 8% 2 4 2 2 3 2 4 6% 40%	4468
February	1st to 10th	Night	16% 8% 3 6% 5% 4 4 3 4 6% 41%	2280
	11th to 20th	Night	21% 7% 3 5% 3 3 3 3 5% 6% 41%	2218
	21st to end	Night	21% 8% 3 6% 3 3 4 4 5% 6% 37%	1884
March	1st to 10th	Night	24% 12% 3 6% 4 4 3 3 5% 7% 30%	3479
	11th to 20th	Night	17% 8% 3 7% 4 5% 5% 4 5% 7% 35%	3480
	21st to end	Night	17% 8% 2 6% 4 5% 4 3 5% 6% 42%	3702
April	1st to 10th	Night	13% 7% 2 5% 4 4 4 3 6% 8% 43%	1900
	11th to 20th	Night	14% 6% 3 6% 4 4 4 3 5% 7% 45%	1875
	21st to end	Night	9% 4 2 4 4 4 4 3 5% 7% 54%	1900
May	1st to 10th	Night	15% 6% 3 6% 4 3 4 3 6% 8% 42%	3130
	11th to 20th	Night	16% 7% 2 6% 4 4 4 4 5% 6% 43%	3129
	21st to end	Night	8% 5% 2 5% 5% 5% 5% 5% 8% 11% 41%	3426
June	1st to 10th	Night	7% 5% 3 7% 4 4 5% 4 8% 10% 42%	1748
	11th to 20th	Night	3 5% 2 5% 4 4 6% 5% 8% 11% 47%	1710
	21st to end	Night	5% 5% 3 5% 6% 5% 7% 6% 9% 12% 37%	1710
July	1st to 10th	Night	5% 6% 3 10% 6% 7% 7% 5% 8% 12% 31%	2850
	11th to 20th	Night	5% 4 2 6% 5% 6% 8% 6% 10% 13% 34%	2850
	21st to end	Night	7% 8% 3 8% 7% 6% 6% 6% 8% 12% 30%	3241
August	1st to 10th	Night	2 2 1 4 3 3 4 3 7% 11% 60%	3144
	11th to 20th	Night	3 3 1 6% 5% 6% 6% 4 8% 13% 45%	3100
	21st to end	Night	7% 6% 3 8% 6% 5% 5% 4 6% 8% 42%	3476
September	1st to 10th	Night	8% 5% 2 7% 4 6% 6% 4 8% 10% 41%	1900
	11th to 20th	Night	9% 6% 2 6% 4 5% 5% 4 6% 8% 45%	1900
	21st to end	Night	8% 5% 2 6% 4 4 4 4 5% 7% 53%	2079
October	1st to 10th	Night	7% 5% 2 4 3 3 3 3 5% 6% 60%	2272
	11th to 20th	Night	7% 5% 2 5% 3 3 3 3 4 6% 58%	2280
	21st to end	Night	11% 5% 2 5% 3 3 3 2 5% 5% 57%	2508
November	1st to 10th	Night	11% 5% 2 5% 4 3 4 3 4 5% 55%	2335
	11th to 20th	Night	13% 5% 2 5% 3 3 3 3 4 5% 54%	2280
	21st to end	Night	15% 7% 2 6% 3 3 4 3 5% 6% 47%	2438
December	1st to 10th	Night	16% 8% 2 5% 3 3 3 2 4 6% 46%	2470
	11th to 20th	Night	14% 10% 3 7% 4 3 4 3 5% 5% 41%	2886
	21st to end	Night	20% 11% 2 6% 3 3 3 2 4 5% 41%	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	29% 38% 3 10% 16% 3	2848
	11th to 20th	Day	20% 37% 3 14% 19% 7%	2850
	21st to end	Day	32% 39% 3 7% 13% 5%	3180
February	1st to 10th	Day	19% 65% 2 5% 5% 4	1900
	11th to 20th	Day	18% 63% 3 6% 8% 2	1858
	21st to end	Day	19% 65% 3 3 6% 4	1570
March	1st to 10th	Day	40% 42% 5% 8% 4 1	3401
	11th to 20th	Day	32% 42% 4 12% 8% 2	3480
	21st to end	Day	29% 41% 5% 7% 13% 5%	3927
April	1st to 10th	Day	16% 65% 2 6% 8% 4	2280
	11th to 20th	Day	19% 65% 3 5% 5% 3	2254
	21st to end	Day	13% 65% 4 7% 7% 3	2280
May	1st to 10th	Day	29% 44% 7% 12% 6% 2	3800
	11th to 20th	Day	26% 41% 6% 9% 16% 2	3768
	21st to end	Day	20% 42% 10% 21% 6% 1	4141
June	1st to 10th	Day	17% 66% 3 7% 6% 1	2425
	11th to 20th	Day	19% 66% 5% 6% 4	2470
	21st to end	Day	18% 65% 7% 8% 3	2470
July	1st to 10th	Day	29% 43% 14% 13% 2	4056
	11th to 20th	Day	30% 44% 18% 7% 1	4051
	21st to end	Day	37% 38% 7% 12% 5% 1	4179
August	1st to 10th	Day	9% 37% 7% 24% 22% 1	3773
	11th to 20th	Day	15% 41% 13% 22% 8% 1	3765
	21st to end	Day	27% 40% 8% 10% 13% 1	4179
September	1st to 10th	Day	17% 61% 8% 7% 5% 2	2280
	11th to 20th	Day	14% 60% 6% 10% 8% 2	2271
	21st to end	Day	13% 60% 5% 13% 6% 2	2090
October	1st to 10th	Day	14% 37% 4 7% 12% 26%	3161
	11th to 20th	Day	7% 36% 4 12% 17% 26%	3140
	21st to end	Day	13% 36% 2 6% 28% 14%	3428
November	1st to 10th	Day	19% 56% 4 9% 8% 4	1948
	11th to 20th	Day	18% 59% 2 7% 9% 5%	1900
	21st to end	Day	15% 60% 3 9% 9% 4	1733
December	1st to 10th	Day	19% 59% 4 7% 7% 4	1710
	11th to 20th	Day	21% 48% 2 7% 16% 6%	2292
	21st to end	Day	28% 38% 5% 10% 15% 2	3135
January	1st to 10th	Night	28% 37% 4 9% 16% 6%	4108
	11th to 20th	Night	22% 37% 4 12% 17% 8%	4120
	21st to end	Night	30% 38% 2 12% 13% 4	4468
February	1st to 10th	Night	16% 65% 2 7% 7% 3	2280
	11th to 20th	Night	16% 64% 2 7% 8% 3	2219
	21st to end	Night	19% 64% 3 5% 5% 5%	1884
March	1st to 10th	Night	41% 43% 5% 6% 4 1	3479
	11th to 20th	Night	30% 43% 5% 11% 9% 3	3480
	21st to end	Night	28% 42% 4 11% 12% 3	3702
April	1st to 10th	Night	15% 65% 3 5% 8% 4	1900
	11th to 20th	Night	16% 65% 4 7% 5% 3	1875
	21st to end	Night	12% 65% 4 8% 9% 3	1900
May	1st to 10th	Night	26% 43% 9% 10% 9% 3	3160
	11th to 20th	Night	27% 42% 7% 13% 11% 1	3130
	21st to end	Night	22% 44% 11% 16% 7% 1	3435
June	1st to 10th	Night	12% 66% 5% 10% 6% 1	1748
	11th to 20th	Night	12% 67% 8% 9% 4 1	1710
	21st to end	Night	14% 66% 8% 8% 3	1710
July	1st to 10th	Night	27% 44% 15% 11% 2	2805
	11th to 20th	Night	23% 45% 23% 7% 1	2796
	21st to end	Night	32% 42% 9% 13% 4	3138
August	1st to 10th	Night	8% 37% 10% 22% 22% 1	3132
	11th to 20th	Night	15% 42% 15% 23% 5% 1	3130
	21st to end	Night	26% 40% 8% 12% 11% 3	3476
September	1st to 10th	Night	14% 62% 8% 8% 6% 3	1900
	11th to 20th	Night	11% 62% 7% 11% 6% 3	1900
	21st to end	Night	13% 61% 6% 12% 5% 3	2079
October	1st to 10th	Night	13% 37% 5% 7% 13% 24%	3792
	11th to 20th	Night	7% 36% 2 14% 17% 24%	3779
	21st to end	Night	11% 36% 3 6% 27% 17%	4120
November	1st to 10th	Night	20% 56% 6% 7% 8% 3	2335
	11th to 20th	Night	17% 59% 2 7% 10% 5%	2280
	21st to end	Night	15% 59% 3 8% 10% 5%	2438
December	1st to 10th	Night	19% 59% 3 9% 7% 3	2470
	11th to 20th	Night	22% 48% 3 5% 12% 10%	2887
	21st to end	Night	31% 38% 4 10% 12% 5%	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	27% 20% 31% 15% 6% 1	270
	11th to 20th	Day	27% 14% 38% 15% 6%	270
	21st to end	Day	31% 20% 37% 9% 2	297
February	1st to 10th	Day	31% 21% 31% 13% 3 1	270
	11th to 20th	Day	37% 17% 29% 12% 4	270
	21st to end	Day	25% 26% 38% 10% 1	225
March	1st to 10th	Day	26% 19% 35% 17% 3	270
	11th to 20th	Day	27% 19% 37% 14% 2	270
	21st to end	Day	18% 22% 33% 20% 5% 1	359
April	1st to 10th	Day	20% 13% 35% 23% 9% 1	460
	11th to 20th	Day	26% 14% 29% 21% 9% 2	452
	21st to end	Day	13% 10% 29% 32% 12% 3	460
May	1st to 10th	Day	18% 8% 28% 32% 12% 3	463
	11th to 20th	Day	16% 4 25% 27% 20% 8%	487
	21st to end	Day	7% 5% 20% 33% 22% 12%	529
June	1st to 10th	Day	11% 3 13% 34% 29% 11%	635
	11th to 20th	Day	8% 3 14% 37% 28% 11%	680
	21st to end	Day	9% 5% 10% 27% 32% 17%	680
July	1st to 10th	Day	8% 3 6% 25% 37% 21%	671
	11th to 20th	Day	6% 2 4 25% 41% 22%	668
	21st to end	Day	11% 4 5% 23% 40% 17%	652
August	1st to 10th	Day	6% 3 4 20% 40% 28%	486
	11th to 20th	Day	9% 2 3 15% 42% 29%	479
	21st to end	Day	13% 2 6% 23% 31% 25%	539
September	1st to 10th	Day	13% 2 8% 25% 33% 19%	490
	11th to 20th	Day	12% 4 11% 23% 36% 14%	490
	21st to end	Day	11% 3 9% 31% 32% 13%	490
October	1st to 10th	Day	7% 6% 25% 40% 18% 6%	301
	11th to 20th	Day	12% 5% 23% 35% 20% 6%	300
	21st to end	Day	19% 11% 21% 31% 13% 5%	330
November	1st to 10th	Day	16% 6% 31% 32% 11% 4	297
	11th to 20th	Day	18% 9% 36% 23% 13%	270
	21st to end	Day	18% 16% 34% 22% 8% 3	270
December	1st to 10th	Day	24% 11% 35% 20% 9% 1	270
	11th to 20th	Day	23% 14% 37% 21% 4 1	270
	21st to end	Day	29% 14% 33% 18% 4 1	297
January	1st to 10th	Night	24% 14% 32% 24% 6%	950
	11th to 20th	Night	22% 12% 33% 25% 8% 1	950
	21st to end	Night	25% 13% 33% 24% 5%	1007
February	1st to 10th	Night	22% 15% 35% 25% 4	760
	11th to 20th	Night	27% 14% 28% 25% 6%	743
	21st to end	Night	27% 18% 32% 21% 2	628
March	1st to 10th	Night	21% 12% 32% 28% 6%	608
	11th to 20th	Night	20% 10% 35% 28% 7%	570
	21st to end	Night	18% 10% 37% 27% 8%	627
April	1st to 10th	Night	17% 12% 34% 26% 10% 1	570
	11th to 20th	Night	18% 9% 34% 26% 13% 1	563
	21st to end	Night	11% 8% 32% 34% 14% 1	570
May	1st to 10th	Night	12% 4 30% 38% 15% 1	570
	11th to 20th	Night	13% 2 23% 38% 22% 2	561
	21st to end	Night	6% 3 18% 38% 28% 6%	617
June	1st to 10th	Night	9% 3 9% 38% 35% 6%	570
	11th to 20th	Night	3 1 10% 35% 42% 9%	570
	21st to end	Night	7% 1 8% 29% 39% 16%	570
July	1st to 10th	Night	5% 2 4 26% 45% 19%	555
	11th to 20th	Night	5% 2 3 22% 46% 21%	552
	21st to end	Night	6% 3 4 24% 49% 15%	624
August	1st to 10th	Night	4 2 2 22% 51% 20%	567
	11th to 20th	Night	5% 1 4 20% 49% 20%	564
	21st to end	Night	9% 3 5% 22% 42% 19%	627
September	1st to 10th	Night	8% 3 6% 25% 44% 14%	570
	11th to 20th	Night	11% 3 7% 30% 40% 9%	570
	21st to end	Night	11% 3 9% 31% 39% 7%	749
October	1st to 10th	Night	8% 2 18% 36% 32% 4	760
	11th to 20th	Night	10% 4 24% 35% 23% 4	760
	21st to end	Night	15% 8% 21% 33% 21% 2	836
November	1st to 10th	Night	14% 7% 20% 35% 21% 2	779
	11th to 20th	Night	15% 7% 29% 33% 14% 2	760
	21st to end	Night	18% 10% 29% 29% 13% 1	760
December	1st to 10th	Night	20% 11% 29% 29% 10%	760
	11th to 20th	Night	24% 8% 32% 28% 7%	781
	21st to end	Night	28% 11% 28% 25% 7%	1045

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