Macon
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Macon clear sky chart from 2005-11-06 to 2025-07-06.

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% 6% 2 6% 4 4 5% 4 6% 8% 43%	120047
	Night	12% 6% 2 6% 4 4 4 4 6% 8% 45%	118754
Transparency	Day	37% 7% 11% 19% 19% 7%	123865
	Night	36% 6% 10% 19% 20% 9%	123073
Seeing	Day	14% 10% 22% 24% 20% 9%	15876
	Night	14% 9% 22% 31% 21% 4	25918

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	15% 5% 1 5% 3 3 3 2 4 5% 54%	4056
	11th to 20th	Day	12% 7% 2 4 3 2 2 3 4 7% 55%	4060
	21st to end	Day	18% 7% 2 5% 4 4 3 2 4 6% 43%	4627
February	1st to 10th	Day	15% 7% 3 7% 5% 5% 4 4 5% 7% 40%	2000
	11th to 20th	Day	20% 6% 2 5% 3 3 3 4 5% 5% 43%	1948
	21st to end	Day	16% 7% 2 6% 5% 4 3 4 6% 7% 41%	1650
March	1st to 10th	Day	19% 8% 3 6% 4 4 4 3 5% 6% 38%	4744
	11th to 20th	Day	8% 4 2 5% 3 4 4 3 5% 7% 54%	4980
	21st to end	Day	16% 7% 2 6% 4 4 4 3 4 5% 46%	5465
April	1st to 10th	Day	11% 5% 2 6% 5% 4 4 3 5% 6% 49%	2200
	11th to 20th	Day	12% 4 2 5% 3 4 3 4 5% 7% 51%	2334
	21st to end	Day	7% 5% 2 4 4 4 4 5% 6% 7% 52%	2580
May	1st to 10th	Day	10% 7% 2 7% 4 5% 5% 4 6% 8% 42%	5862
	11th to 20th	Day	15% 7% 3 7% 5% 5% 5% 5% 7% 9% 34%	5861
	21st to end	Day	7% 5% 2 6% 4 5% 5% 4 7% 9% 45%	6433
June	1st to 10th	Day	11% 6% 2 6% 6% 6% 7% 5% 8% 10% 33%	2600
	11th to 20th	Day	5% 4 2 5% 5% 6% 6% 6% 8% 12% 42%	2600
	21st to end	Day	5% 5% 2 7% 6% 6% 7% 6% 8% 10% 38%	2600
July	1st to 10th	Day	11% 8% 3 8% 7% 7% 8% 7% 9% 10% 22%	4185
	11th to 20th	Day	4 5% 2 8% 7% 7% 6% 6% 9% 13% 33%	4120
	21st to end	Day	6% 7% 3 10% 7% 8% 9% 7% 9% 12% 21%	4466
August	1st to 10th	Day	12% 5% 2 7% 5% 6% 7% 5% 9% 13% 31%	4104
	11th to 20th	Day	5% 4 2 6% 5% 4 5% 5% 7% 10% 47%	3826
	21st to end	Day	7% 4 2 5% 4 4 5% 4 7% 11% 46%	4094
September	1st to 10th	Day	10% 6% 2 7% 5% 5% 5% 5% 8% 9% 37%	2090
	11th to 20th	Day	13% 6% 3 7% 4 4 5% 4 7% 8% 39%	2090
	21st to end	Day	12% 5% 2 7% 4 6% 5% 4 5% 7% 45%	2090
October	1st to 10th	Day	12% 5% 2 4 3 4 4 4 4 7% 52%	2090
	11th to 20th	Day	10% 4 2 3 2 3 3 3 5% 5% 59%	1961
	21st to end	Day	10% 4 1 5% 4 3 3 3 4 5% 57%	2090
November	1st to 10th	Day	12% 5% 2 5% 4 3 4 3 4 4 53%	1872
	11th to 20th	Day	13% 5% 2 4 4 2 2 3 4 6% 54%	1800
	21st to end	Day	13% 6% 2 6% 4 4 4 3 4 6% 47%	1800
December	1st to 10th	Day	13% 6% 2 5% 4 4 4 3 5% 5% 49%	2930
	11th to 20th	Day	15% 7% 3 5% 3 3 4 3 5% 5% 47%	3373
	21st to end	Day	21% 7% 2 6% 3 3 3 3 4 5% 43%	4466
January	1st to 10th	Night	15% 5% 2 4 3 3 3 3 4 5% 52%	5889
	11th to 20th	Night	12% 6% 2 6% 4 4 4 3 5% 6% 48%	5900
	21st to end	Night	18% 8% 3 5% 3 3 3 3 5% 7% 42%	6324
February	1st to 10th	Night	15% 7% 3 6% 4 3 4 3 5% 6% 45%	2400
	11th to 20th	Night	19% 7% 2 5% 4 3 3 3 4 4 45%	2338
	21st to end	Night	15% 6% 2 6% 4 4 4 4 6% 5% 44%	1980
March	1st to 10th	Night	19% 8% 2 6% 4 4 4 3 5% 6% 39%	5107
	11th to 20th	Night	10% 5% 1 4 3 4 4 4 6% 7% 52%	4980
	21st to end	Night	14% 6% 2 5% 4 4 4 4 5% 6% 46%	5467
April	1st to 10th	Night	11% 5% 2 5% 4 3 4 4 6% 7% 49%	2200
	11th to 20th	Night	11% 4 2 4 3 4 4 3 6% 7% 52%	2030
	21st to end	Night	6% 4 2 6% 4 4 5% 3 4 8% 54%	1820
May	1st to 10th	Night	9% 6% 2 7% 4 5% 5% 5% 7% 10% 40%	4033
	11th to 20th	Night	16% 5% 2 6% 4 5% 4 5% 7% 10% 36%	4032
	21st to end	Night	8% 5% 2 6% 4 4 5% 4 7% 10% 46%	4421
June	1st to 10th	Night	8% 6% 2 7% 6% 5% 6% 5% 8% 10% 37%	1800
	11th to 20th	Night	5% 5% 2 6% 4 4 5% 5% 8% 13% 44%	1800
	21st to end	Night	5% 6% 2 6% 5% 6% 7% 5% 9% 12% 38%	1800
July	1st to 10th	Night	10% 9% 3 9% 6% 7% 7% 6% 8% 10% 25%	2885
	11th to 20th	Night	4 4 2 8% 7% 6% 7% 7% 11% 15% 28%	2840
	21st to end	Night	9% 7% 3 8% 8% 8% 8% 7% 9% 11% 23%	3087
August	1st to 10th	Night	10% 6% 2 10% 6% 6% 7% 5% 8% 12% 28%	2825
	11th to 20th	Night	6% 4 2 6% 4 5% 5% 5% 7% 10% 45%	2999
	21st to end	Night	7% 4 2 5% 4 4 4 4 7% 10% 49%	3528
September	1st to 10th	Night	8% 7% 3 7% 6% 5% 6% 5% 7% 10% 37%	2090
	11th to 20th	Night	11% 7% 2 6% 5% 5% 5% 4 5% 6% 43%	2090
	21st to end	Night	11% 5% 2 7% 5% 4 4 4 6% 7% 45%	2090
October	1st to 10th	Night	10% 6% 2 6% 4 3 4 3 4 6% 52%	2090
	11th to 20th	Night	11% 4 1 4 3 3 3 3 3 5% 60%	2218
	21st to end	Night	10% 5% 2 5% 3 3 4 3 5% 5% 57%	2508
November	1st to 10th	Night	11% 6% 2 5% 4 3 4 3 4 6% 53%	2421
	11th to 20th	Night	14% 6% 2 4 3 3 2 2 4 6% 54%	2600
	21st to end	Night	14% 5% 2 5% 4 4 3 3 5% 6% 50%	2600
December	1st to 10th	Night	13% 5% 2 4 3 3 3 2 3 6% 54%	4250
	11th to 20th	Night	16% 5% 2 5% 3 3 3 3 4 6% 49%	4822
	21st to end	Night	20% 7% 2 6% 3 4 4 3 4 5% 42%	6490

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	34% 3 5% 18% 32% 8%	4057
	11th to 20th	Day	31% 3 4 18% 32% 12%	4060
	21st to end	Day	43% 3 7% 16% 21% 10%	4627
February	1st to 10th	Day	44% 4 8% 18% 19% 8%	2000
	11th to 20th	Day	42% 4 4 19% 23% 7%	1958
	21st to end	Day	41% 6% 7% 16% 20% 10%	1650
March	1st to 10th	Day	46% 5% 7% 12% 23% 7%	4744
	11th to 20th	Day	30% 5% 8% 14% 22% 22%	4980
	21st to end	Day	41% 5% 6% 20% 18% 11%	5465
April	1st to 10th	Day	36% 6% 10% 21% 17% 10%	2200
	11th to 20th	Day	32% 5% 9% 20% 23% 11%	2334
	21st to end	Day	29% 7% 11% 24% 25% 5%	2580
May	1st to 10th	Day	38% 7% 15% 20% 17% 2	5897
	11th to 20th	Day	44% 8% 18% 19% 10% 1	5865
	21st to end	Day	34% 9% 15% 20% 21% 2	6447
June	1st to 10th	Day	42% 9% 15% 20% 12% 2	2600
	11th to 20th	Day	31% 10% 18% 25% 15% 2	2600
	21st to end	Day	36% 10% 19% 20% 12% 3	2600
July	1st to 10th	Day	47% 15% 20% 13% 4 1	4120
	11th to 20th	Day	37% 14% 21% 23% 3 1	4051
	21st to end	Day	48% 17% 18% 13% 4	4324
August	1st to 10th	Day	41% 10% 20% 26% 3	4091
	11th to 20th	Day	29% 10% 15% 32% 13% 1	3865
	21st to end	Day	31% 8% 15% 31% 14% 1	4094
September	1st to 10th	Day	40% 9% 15% 16% 16% 4	2090
	11th to 20th	Day	40% 8% 11% 19% 18% 4	2090
	21st to end	Day	39% 6% 9% 21% 19% 6%	2090
October	1st to 10th	Day	30% 3 6% 15% 32% 13%	3480
	11th to 20th	Day	16% 3 5% 17% 27% 32%	3240
	21st to end	Day	21% 3 5% 19% 37% 15%	3428
November	1st to 10th	Day	35% 4 7% 13% 27% 14%	1872
	11th to 20th	Day	32% 4 6% 19% 25% 14%	1800
	21st to end	Day	38% 4 8% 16% 25% 9%	1800
December	1st to 10th	Day	37% 3 6% 18% 26% 9%	2930
	11th to 20th	Day	39% 3 8% 21% 22% 7%	3370
	21st to end	Day	43% 4 6% 21% 22% 3	4466
January	1st to 10th	Night	33% 4 5% 19% 30% 9%	5889
	11th to 20th	Night	37% 4 5% 19% 26% 9%	5900
	21st to end	Night	43% 3 5% 14% 27% 8%	6324
February	1st to 10th	Night	40% 4 7% 18% 21% 10%	2400
	11th to 20th	Night	44% 4 5% 16% 22% 10%	2339
	21st to end	Night	40% 6% 8% 16% 17% 15%	1980
March	1st to 10th	Night	45% 5% 9% 15% 15% 12%	5107
	11th to 20th	Night	29% 5% 10% 12% 24% 20%	4980
	21st to end	Night	38% 4 7% 18% 20% 13%	5467
April	1st to 10th	Night	33% 5% 11% 20% 19% 12%	2200
	11th to 20th	Night	30% 4 7% 23% 24% 11%	2030
	21st to end	Night	28% 6% 11% 24% 23% 8%	1820
May	1st to 10th	Night	34% 10% 16% 22% 14% 3	4060
	11th to 20th	Night	41% 8% 17% 22% 10% 1	4033
	21st to end	Night	30% 7% 15% 25% 20% 3	4429
June	1st to 10th	Night	39% 10% 18% 18% 15% 1	1800
	11th to 20th	Night	29% 8% 20% 28% 13% 2	1800
	21st to end	Night	34% 10% 22% 17% 12% 4	1800
July	1st to 10th	Night	49% 14% 20% 12% 3 2	2840
	11th to 20th	Night	38% 16% 24% 16% 5% 1	2786
	21st to end	Night	49% 16% 18% 12% 4 1	2988
August	1st to 10th	Night	44% 11% 20% 22% 3	2814
	11th to 20th	Night	31% 9% 18% 27% 13% 1	3026
	21st to end	Night	29% 8% 18% 29% 14% 2	3528
September	1st to 10th	Night	39% 11% 16% 15% 14% 4	2090
	11th to 20th	Night	39% 9% 12% 17% 18% 5%	2090
	21st to end	Night	37% 7% 11% 18% 20% 7%	2090
October	1st to 10th	Night	34% 5% 7% 13% 28% 14%	3480
	11th to 20th	Night	17% 2 5% 13% 30% 33%	3678
	21st to end	Night	20% 4 4 20% 33% 20%	4120
November	1st to 10th	Night	33% 4 8% 14% 27% 14%	2421
	11th to 20th	Night	33% 3 6% 17% 28% 14%	2600
	21st to end	Night	36% 4 7% 18% 24% 11%	2600
December	1st to 10th	Night	33% 3 6% 20% 30% 8%	4250
	11th to 20th	Night	37% 4 10% 18% 23% 7%	4824
	21st to end	Night	44% 4 5% 22% 22% 3	6490

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	18% 25% 44% 12% 1	300
	11th to 20th	Day	20% 24% 34% 15% 6% 1	300
	21st to end	Day	23% 26% 36% 12% 2	330
February	1st to 10th	Day	17% 24% 39% 15% 4	300
	11th to 20th	Day	32% 21% 30% 15% 2	300
	21st to end	Day	23% 21% 39% 14% 3	249
March	1st to 10th	Day	19% 23% 29% 21% 7% 1	408
	11th to 20th	Day	19% 17% 34% 22% 8% 1	500
	21st to end	Day	20% 15% 36% 21% 8% 1	550
April	1st to 10th	Day	18% 17% 29% 25% 11% 1	500
	11th to 20th	Day	13% 16% 28% 25% 15% 3	492
	21st to end	Day	11% 12% 25% 28% 21% 4	500
May	1st to 10th	Day	11% 13% 28% 28% 15% 6%	503
	11th to 20th	Day	14% 4 22% 30% 19% 10%	527
	21st to end	Day	11% 4 20% 29% 22% 13%	573
June	1st to 10th	Day	14% 3 17% 26% 27% 13%	530
	11th to 20th	Day	7% 4 15% 24% 29% 21%	530
	21st to end	Day	6% 4 12% 28% 28% 22%	530
July	1st to 10th	Day	8% 3 9% 21% 37% 23%	505
	11th to 20th	Day	7% 1 5% 22% 33% 31%	484
	21st to end	Day	5% 2 7% 24% 39% 22%	532
August	1st to 10th	Day	14% 2 9% 25% 29% 21%	486
	11th to 20th	Day	8% 3 6% 22% 39% 22%	479
	21st to end	Day	13% 4 6% 29% 30% 17%	539
September	1st to 10th	Day	13% 3 11% 26% 32% 15%	490
	11th to 20th	Day	15% 4 14% 28% 28% 11%	490
	21st to end	Day	13% 3 16% 31% 26% 10%	490
October	1st to 10th	Day	15% 6% 24% 25% 21% 8%	490
	11th to 20th	Day	11% 8% 22% 34% 19% 7%	490
	21st to end	Day	12% 7% 24% 32% 20% 5%	539
November	1st to 10th	Day	19% 9% 26% 26% 17% 3	410
	11th to 20th	Day	16% 15% 37% 22% 8% 2	300
	21st to end	Day	13% 17% 33% 25% 11%	300
December	1st to 10th	Day	23% 18% 34% 17% 7% 1	300
	11th to 20th	Day	25% 16% 34% 17% 7%	300
	21st to end	Day	28% 16% 31% 18% 6% 1	330
January	1st to 10th	Night	20% 19% 31% 25% 5% 1	800
	11th to 20th	Night	19% 16% 30% 27% 9%	800
	21st to end	Night	19% 16% 34% 26% 3	880
February	1st to 10th	Night	17% 14% 32% 31% 7%	800
	11th to 20th	Night	23% 16% 31% 27% 3	783
	21st to end	Night	19% 15% 33% 29% 3	660
March	1st to 10th	Night	16% 13% 34% 31% 6%	800
	11th to 20th	Night	17% 14% 30% 29% 10%	800
	21st to end	Night	15% 15% 30% 30% 9% 1	880
April	1st to 10th	Night	14% 14% 29% 30% 12% 1	800
	11th to 20th	Night	13% 11% 28% 31% 16% 1	648
	21st to end	Night	6% 8% 25% 40% 21% 1	600
May	1st to 10th	Night	9% 7% 23% 39% 21% 1	600
	11th to 20th	Night	12% 3 21% 36% 25% 5%	591
	21st to end	Night	11% 3 15% 37% 29% 5%	650
June	1st to 10th	Night	9% 3 13% 39% 33% 4	600
	11th to 20th	Night	6% 2 11% 33% 37% 12%	600
	21st to end	Night	6% 2 8% 32% 43% 9%	600
July	1st to 10th	Night	9% 1 7% 26% 41% 16%	570
	11th to 20th	Night	8% 1 6% 24% 44% 16%	552
	21st to end	Night	7% 2 6% 28% 46% 12%	624
August	1st to 10th	Night	7% 1 6% 28% 46% 12%	567
	11th to 20th	Night	10% 2 5% 29% 45% 9%	564
	21st to end	Night	15% 3 6% 27% 39% 10%	653
September	1st to 10th	Night	9% 4 10% 28% 39% 10%	760
	11th to 20th	Night	15% 2 11% 30% 36% 6%	760
	21st to end	Night	13% 3 15% 30% 34% 4	760
October	1st to 10th	Night	13% 5% 19% 33% 24% 6%	760
	11th to 20th	Night	12% 7% 20% 34% 24% 3	760
	21st to end	Night	12% 7% 22% 33% 24% 2	836
November	1st to 10th	Night	13% 8% 21% 35% 21% 1	780
	11th to 20th	Night	16% 11% 24% 33% 15% 1	800
	21st to end	Night	15% 11% 27% 33% 14% 1	800
December	1st to 10th	Night	17% 12% 30% 28% 13% 1	800
	11th to 20th	Night	21% 9% 28% 31% 10% 1	800
	21st to end	Night	26% 13% 23% 30% 8%	880

Page generated at 2025-07-03 01:30:12. Version ac07

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