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 2024-03-18.

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% 5% 2 5% 5% 3 5% 5% 6% 8% 43%	79064
	Night	12% 5% 2 5% 5% 3 5% 5% 5% 8% 45%	80732
Transparency	Day	38% 7% 11% 19% 19% 6%	78787
	Night	37% 7% 11% 18% 20% 8%	80528
Seeing	Day	15% 10% 22% 24% 20% 10%	14096
	Night	14% 9% 21% 30% 21% 4	24244

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% 5% 1 5% 5% 3 3 4 5% 7% 46%	2836
	11th to 20th	Day	12% 6% 2 3 3 2 3 4 4 6% 55%	2840
	21st to end	Day	21% 8% 3 5% 4 3 3 3 3 6% 42%	3229
February	1st to 10th	Day	16% 6% 3 7% 5% 3 4 5% 5% 7% 39%	1900
	11th to 20th	Day	20% 6% 2 5% 4 2 3 4 5% 6% 44%	1848
	21st to end	Day	17% 7% 3 5% 5% 3 3 5% 6% 7% 39%	1570
March	1st to 10th	Day	15% 5% 2 4 5% 2 3 4 5% 6% 50%	2002
	11th to 20th	Day	15% 6% 3 6% 5% 3 4 4 4 7% 43%	2058
	21st to end	Day	14% 6% 2 5% 5% 3 5% 5% 5% 7% 44%	2178
April	1st to 10th	Day	11% 5% 2 5% 5% 3 5% 4 4 5% 49%	1980
	11th to 20th	Day	13% 4 2 5% 4 3 3 4 4 7% 49%	2098
	21st to end	Day	8% 4 1 3 4 3 4 6% 5% 7% 54%	2322
May	1st to 10th	Day	8% 4 2 4 4 3 4 4 6% 9% 52%	2340
	11th to 20th	Day	9% 5% 3 6% 6% 4 5% 6% 6% 9% 42%	2301
	21st to end	Day	9% 5% 2 5% 5% 4 6% 5% 7% 9% 43%	2531
June	1st to 10th	Day	11% 5% 2 5% 7% 5% 6% 6% 7% 10% 34%	2340
	11th to 20th	Day	6% 4 2 4 6% 4 6% 7% 7% 12% 41%	2340
	21st to end	Day	5% 5% 2 6% 7% 4 7% 7% 8% 10% 38%	2340
July	1st to 10th	Day	8% 5% 3 6% 9% 5% 8% 9% 9% 11% 29%	2340
	11th to 20th	Day	6% 6% 3 7% 8% 6% 7% 7% 8% 12% 30%	2340
	21st to end	Day	6% 4 3 7% 7% 5% 8% 9% 8% 12% 31%	2547
August	1st to 10th	Day	9% 5% 3 6% 6% 5% 8% 7% 10% 12% 29%	2327
	11th to 20th	Day	9% 6% 3 7% 8% 4 7% 8% 8% 11% 30%	2183
	21st to end	Day	13% 7% 3 7% 7% 4 7% 7% 7% 9% 30%	2332
September	1st to 10th	Day	10% 6% 3 6% 6% 4 6% 6% 7% 9% 38%	1980
	11th to 20th	Day	12% 6% 3 6% 5% 4 5% 5% 6% 9% 40%	1980
	21st to end	Day	12% 5% 2 6% 5% 4 6% 5% 5% 6% 44%	1980
October	1st to 10th	Day	12% 5% 2 4 4 3 4 4 4 7% 52%	1980
	11th to 20th	Day	11% 4 2 3 3 2 3 4 6% 6% 57%	1858
	21st to end	Day	10% 4 1 5% 4 2 3 4 4 5% 56%	1980
November	1st to 10th	Day	11% 4 3 4 4 3 4 4 4 4 55%	1777
	11th to 20th	Day	13% 4 3 4 4 2 3 3 5% 6% 54%	1710
	21st to end	Day	14% 5% 2 5% 5% 3 4 4 4 7% 47%	1710
December	1st to 10th	Day	17% 5% 3 5% 6% 3 5% 4 5% 6% 41%	1710
	11th to 20th	Day	19% 6% 2 4 4 2 3 4 4 6% 46%	2153
	21st to end	Day	19% 7% 3 6% 5% 2 3 4 3 6% 42%	3124
January	1st to 10th	Night	19% 6% 2 4 4 3 4 5% 6% 6% 41%	4109
	11th to 20th	Night	11% 5% 2 4 5% 3 4 5% 5% 7% 49%	4120
	21st to end	Night	21% 9% 3 5% 4 2 3 3 4 5% 40%	4422
February	1st to 10th	Night	16% 6% 3 5% 5% 2 4 4 5% 7% 44%	2280
	11th to 20th	Night	19% 6% 2 5% 4 3 3 3 3 5% 46%	2218
	21st to end	Night	15% 6% 2 5% 5% 3 5% 5% 6% 5% 43%	1884
March	1st to 10th	Night	12% 6% 3 5% 4 2 5% 4 4 5% 50%	2176
	11th to 20th	Night	14% 5% 2 5% 4 3 5% 5% 5% 7% 45%	2068
	21st to end	Night	11% 5% 2 5% 3 3 4 5% 5% 8% 48%	2178
April	1st to 10th	Night	11% 5% 2 4 4 2 4 5% 6% 8% 50%	1980
	11th to 20th	Night	12% 4 2 3 4 3 4 4 5% 7% 51%	1825
	21st to end	Night	6% 3 3 4 4 2 5% 4 4 8% 57%	1638
May	1st to 10th	Night	7% 3 1 4 3 3 4 6% 7% 9% 54%	1620
	11th to 20th	Night	8% 4 2 6% 7% 4 5% 6% 6% 9% 43%	1592
	21st to end	Night	10% 5% 3 6% 5% 3 6% 5% 6% 9% 43%	1744
June	1st to 10th	Night	9% 6% 3 6% 6% 4 6% 6% 8% 10% 37%	1620
	11th to 20th	Night	4 4 2 5% 4 3 5% 6% 7% 13% 46%	1620
	21st to end	Night	6% 5% 2 6% 5% 5% 6% 7% 9% 12% 37%	1620
July	1st to 10th	Night	6% 5% 3 6% 6% 4 8% 9% 9% 12% 32%	1620
	11th to 20th	Night	5% 5% 2 6% 7% 4 7% 8% 10% 14% 32%	1620
	21st to end	Night	6% 4 1 5% 7% 4 8% 7% 9% 13% 36%	1771
August	1st to 10th	Night	5% 3 2 7% 8% 4 6% 8% 8% 13% 35%	1611
	11th to 20th	Night	9% 5% 3 5% 6% 4 7% 7% 8% 11% 36%	1714
	21st to end	Night	11% 6% 4 6% 7% 4 6% 5% 8% 10% 33%	2004
September	1st to 10th	Night	7% 6% 3 6% 7% 4 7% 7% 7% 10% 38%	1980
	11th to 20th	Night	11% 5% 2 6% 6% 3 5% 6% 5% 6% 44%	1980
	21st to end	Night	10% 5% 3 6% 6% 3 4 5% 6% 7% 46%	1980
October	1st to 10th	Night	10% 6% 2 5% 4 2 3 4 4 6% 53%	1980
	11th to 20th	Night	11% 3 2 3 4 3 3 4 3 6% 58%	2101
	21st to end	Night	10% 5% 2 4 3 3 4 4 4 6% 55%	2376
November	1st to 10th	Night	11% 5% 2 4 4 2 4 3 4 6% 55%	2297
	11th to 20th	Night	14% 5% 2 4 3 2 3 2 4 6% 54%	2470
	21st to end	Night	14% 4 2 5% 5% 3 4 4 5% 6% 49%	2470
December	1st to 10th	Night	15% 5% 2 5% 5% 3 4 4 4 8% 46%	2470
	11th to 20th	Night	18% 5% 3 4 4 2 3 3 4 5% 49%	3042
	21st to end	Night	19% 8% 3 6% 5% 3 5% 4 4 6% 36%	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	38% 4 7% 18% 25% 8%	2837
	11th to 20th	Day	31% 3 5% 20% 29% 12%	2840
	21st to end	Day	45% 3 5% 14% 22% 10%	3229
February	1st to 10th	Day	45% 4 7% 17% 19% 8%	1900
	11th to 20th	Day	42% 4 4 18% 24% 8%	1858
	21st to end	Day	43% 6% 7% 15% 19% 10%	1570
March	1st to 10th	Day	36% 4 7% 19% 22% 12%	2002
	11th to 20th	Day	41% 6% 10% 16% 19% 8%	2058
	21st to end	Day	40% 6% 9% 20% 20% 5%	2178
April	1st to 10th	Day	36% 6% 9% 21% 18% 9%	1980
	11th to 20th	Day	34% 5% 8% 19% 22% 11%	2098
	21st to end	Day	28% 6% 10% 24% 26% 6%	2322
May	1st to 10th	Day	29% 6% 12% 22% 25% 6%	2340
	11th to 20th	Day	37% 8% 15% 22% 15% 2	2305
	21st to end	Day	36% 8% 13% 23% 18% 2	2531
June	1st to 10th	Day	42% 10% 15% 20% 11% 2	2340
	11th to 20th	Day	32% 10% 17% 26% 13% 1	2340
	21st to end	Day	37% 10% 20% 19% 11% 3	2340
July	1st to 10th	Day	41% 14% 20% 15% 7% 3	2275
	11th to 20th	Day	41% 13% 21% 17% 6% 2	2271
	21st to end	Day	38% 14% 21% 20% 7% 1	2405
August	1st to 10th	Day	41% 13% 22% 19% 4	2314
	11th to 20th	Day	43% 14% 18% 17% 8% 1	2183
	21st to end	Day	48% 10% 15% 16% 9% 2	2332
September	1st to 10th	Day	39% 9% 15% 16% 16% 4	1980
	11th to 20th	Day	39% 8% 11% 19% 18% 5%	1980
	21st to end	Day	39% 7% 9% 20% 20% 6%	1980
October	1st to 10th	Day	33% 4 10% 20% 24% 9%	1980
	11th to 20th	Day	27% 5% 9% 24% 26% 9%	1858
	21st to end	Day	30% 5% 6% 13% 31% 15%	1980
November	1st to 10th	Day	33% 4 7% 13% 28% 15%	1777
	11th to 20th	Day	31% 4 6% 20% 25% 14%	1710
	21st to end	Day	38% 4 9% 17% 24% 9%	1710
December	1st to 10th	Day	43% 5% 9% 16% 19% 8%	1710
	11th to 20th	Day	41% 3 6% 15% 27% 8%	2150
	21st to end	Day	43% 5% 7% 17% 22% 4	3124
January	1st to 10th	Night	40% 6% 7% 15% 23% 10%	4109
	11th to 20th	Night	33% 5% 7% 23% 24% 9%	4120
	21st to end	Night	47% 4 5% 11% 24% 9%	4422
February	1st to 10th	Night	40% 4 7% 17% 20% 11%	2280
	11th to 20th	Night	43% 4 5% 16% 22% 11%	2219
	21st to end	Night	41% 6% 8% 16% 16% 14%	1884
March	1st to 10th	Night	36% 5% 7% 18% 21% 13%	2176
	11th to 20th	Night	37% 6% 14% 15% 19% 9%	2068
	21st to end	Night	35% 5% 10% 20% 21% 9%	2178
April	1st to 10th	Night	32% 5% 11% 20% 20% 12%	1980
	11th to 20th	Night	31% 4 7% 23% 24% 11%	1825
	21st to end	Night	26% 6% 11% 24% 24% 9%	1638
May	1st to 10th	Night	25% 8% 13% 23% 23% 8%	1620
	11th to 20th	Night	36% 8% 17% 19% 17% 3	1593
	21st to end	Night	36% 8% 11% 24% 19% 3	1745
June	1st to 10th	Night	39% 10% 18% 19% 14%	1620
	11th to 20th	Night	28% 9% 20% 29% 12% 2	1620
	21st to end	Night	36% 10% 23% 16% 11% 4	1620
July	1st to 10th	Night	38% 15% 20% 17% 6% 3	1575
	11th to 20th	Night	36% 15% 26% 15% 7% 1	1566
	21st to end	Night	33% 15% 23% 21% 7% 1	1672
August	1st to 10th	Night	36% 14% 23% 22% 5%	1600
	11th to 20th	Night	38% 12% 21% 18% 10% 1	1714
	21st to end	Night	44% 10% 19% 17% 9% 2	2004
September	1st to 10th	Night	38% 12% 16% 16% 15% 4	1980
	11th to 20th	Night	38% 9% 12% 17% 19% 5%	1980
	21st to end	Night	37% 7% 10% 18% 21% 7%	1980
October	1st to 10th	Night	33% 5% 8% 19% 25% 10%	1980
	11th to 20th	Night	29% 4 8% 20% 28% 11%	2101
	21st to end	Night	30% 5% 5% 16% 29% 15%	2376
November	1st to 10th	Night	31% 4 8% 14% 28% 15%	2297
	11th to 20th	Night	33% 3 6% 17% 27% 15%	2470
	21st to end	Night	37% 4 7% 18% 23% 10%	2470
December	1st to 10th	Night	38% 5% 9% 19% 22% 7%	2470
	11th to 20th	Night	38% 4 6% 15% 28% 8%	3044
	21st to end	Night	48% 5% 7% 19% 18% 4	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	18% 26% 43% 13% 1	270
	11th to 20th	Day	19% 23% 34% 16% 6% 1	270
	21st to end	Day	23% 27% 36% 11% 2	297
February	1st to 10th	Day	19% 26% 38% 14% 3	270
	11th to 20th	Day	30% 21% 30% 16% 2	270
	21st to end	Day	25% 22% 39% 12% 2	225
March	1st to 10th	Day	17% 22% 30% 22% 7% 1	372
	11th to 20th	Day	19% 16% 33% 21% 9% 1	449
	21st to end	Day	18% 16% 36% 21% 8% 1	462
April	1st to 10th	Day	18% 16% 27% 25% 12% 1	420
	11th to 20th	Day	14% 17% 27% 22% 16% 3	412
	21st to end	Day	11% 13% 26% 27% 20% 4	420
May	1st to 10th	Day	11% 13% 26% 27% 15% 7%	423
	11th to 20th	Day	12% 3 20% 30% 22% 12%	447
	21st to end	Day	12% 4 17% 28% 25% 16%	485
June	1st to 10th	Day	14% 2 16% 25% 28% 14%	450
	11th to 20th	Day	8% 4 14% 22% 28% 23%	450
	21st to end	Day	7% 4 12% 31% 27% 20%	450
July	1st to 10th	Day	8% 2 9% 19% 38% 23%	445
	11th to 20th	Day	7% 1 5% 23% 33% 29%	444
	21st to end	Day	5% 2 8% 24% 39% 23%	488
August	1st to 10th	Day	13% 2 9% 25% 29% 22%	446
	11th to 20th	Day	9% 3 5% 21% 39% 23%	439
	21st to end	Day	14% 4 6% 29% 31% 16%	495
September	1st to 10th	Day	12% 2 10% 26% 35% 15%	450
	11th to 20th	Day	14% 2 14% 29% 29% 12%	450
	21st to end	Day	13% 3 15% 33% 26% 10%	450
October	1st to 10th	Day	15% 6% 24% 26% 21% 9%	450
	11th to 20th	Day	12% 8% 21% 32% 20% 7%	450
	21st to end	Day	13% 8% 26% 30% 18% 5%	495
November	1st to 10th	Day	19% 10% 25% 27% 17% 3	375
	11th to 20th	Day	16% 16% 39% 21% 7% 1	270
	21st to end	Day	13% 16% 34% 26% 11%	270
December	1st to 10th	Day	24% 19% 33% 17% 7% 1	270
	11th to 20th	Day	26% 17% 33% 16% 7%	270
	21st to end	Day	27% 16% 31% 18% 6% 1	297
January	1st to 10th	Night	21% 18% 30% 25% 5% 1	760
	11th to 20th	Night	18% 16% 29% 28% 9%	760
	21st to end	Night	19% 17% 34% 26% 3	836
February	1st to 10th	Night	17% 14% 32% 30% 6%	760
	11th to 20th	Night	23% 15% 31% 28% 3	743
	21st to end	Night	20% 15% 33% 28% 3	628
March	1st to 10th	Night	16% 13% 34% 31% 7%	760
	11th to 20th	Night	17% 15% 29% 28% 11%	752
	21st to end	Night	14% 15% 30% 31% 10% 1	792
April	1st to 10th	Night	14% 13% 28% 31% 13% 1	720
	11th to 20th	Night	13% 12% 27% 30% 17% 1	583
	21st to end	Night	6% 8% 26% 37% 22% 1	540
May	1st to 10th	Night	8% 8% 25% 38% 21% 1	540
	11th to 20th	Night	11% 2 20% 34% 27% 5%	531
	21st to end	Night	11% 3 14% 35% 31% 5%	584
June	1st to 10th	Night	9% 2 12% 39% 34% 4	540
	11th to 20th	Night	5% 2 11% 33% 36% 13%	540
	21st to end	Night	6% 2 8% 33% 41% 9%	540
July	1st to 10th	Night	9% 1 6% 26% 41% 16%	525
	11th to 20th	Night	8% 2 6% 25% 44% 16%	522
	21st to end	Night	7% 2 6% 28% 45% 12%	591
August	1st to 10th	Night	7% 1 5% 28% 47% 12%	537
	11th to 20th	Night	11% 2 4 29% 46% 9%	534
	21st to end	Night	16% 3 6% 26% 39% 11%	618
September	1st to 10th	Night	9% 4 9% 27% 40% 10%	720
	11th to 20th	Night	14% 2 11% 30% 37% 6%	720
	21st to end	Night	12% 3 15% 30% 34% 4	720
October	1st to 10th	Night	13% 5% 19% 32% 24% 6%	720
	11th to 20th	Night	13% 7% 20% 32% 25% 3	720
	21st to end	Night	13% 7% 22% 33% 23% 2	792
November	1st to 10th	Night	13% 8% 21% 36% 21% 1	740
	11th to 20th	Night	16% 11% 24% 33% 14% 1	760
	21st to end	Night	16% 10% 26% 33% 14% 1	760
December	1st to 10th	Night	17% 13% 29% 28% 13% 1	760
	11th to 20th	Night	22% 9% 27% 31% 10% 1	760
	21st to end	Night	26% 14% 23% 29% 8%	836

Page generated at 2024-03-15 14:01:42. Version ac07

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