Waycross
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Waycross clear sky chart from 2005-11-06 to 2025-11-18.

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	10% 6% 2 7% 5% 5% 5% 4 6% 9% 40%	126731
	Night	10% 6% 2 6% 4 4 5% 4 6% 8% 44%	123621
Transparency	Day	39% 7% 13% 18% 16% 7%	130455
	Night	37% 6% 13% 18% 18% 9%	127953
Seeing	Day	12% 8% 22% 24% 21% 11%	16698
	Night	12% 6% 23% 33% 22% 4	26714

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	8% 7% 3 6% 3 3 3 3 4 5% 55%	4056
	11th to 20th	Day	16% 7% 2 6% 4 4 4 3 4 6% 44%	4060
	21st to end	Day	10% 6% 2 7% 4 4 4 3 5% 8% 46%	4530
February	1st to 10th	Day	15% 7% 2 6% 6% 4 4 4 4 6% 42%	2000
	11th to 20th	Day	14% 6% 2 6% 4 4 4 3 4 5% 49%	1948
	21st to end	Day	14% 7% 3 5% 4 4 3 3 4 5% 49%	1662
March	1st to 10th	Day	17% 8% 3 6% 4 4 4 3 5% 6% 38%	4935
	11th to 20th	Day	7% 4 1 5% 3 4 4 4 6% 8% 54%	4980
	21st to end	Day	13% 5% 2 6% 4 5% 4 3 5% 6% 47%	5465
April	1st to 10th	Day	8% 6% 2 5% 4 5% 5% 4 5% 7% 47%	2200
	11th to 20th	Day	11% 5% 2 6% 5% 5% 5% 4 5% 6% 47%	2211
	21st to end	Day	6% 4 2 5% 4 4 5% 4 6% 8% 52%	2560
May	1st to 10th	Day	8% 6% 2 7% 5% 5% 5% 5% 7% 10% 41%	5862
	11th to 20th	Day	11% 6% 3 7% 4 5% 4 4 6% 8% 41%	5861
	21st to end	Day	4 4 2 5% 5% 5% 6% 5% 8% 11% 45%	6433
June	1st to 10th	Day	10% 5% 3 7% 7% 7% 7% 4 7% 10% 32%	2600
	11th to 20th	Day	5% 5% 2 6% 7% 7% 8% 7% 8% 11% 34%	2600
	21st to end	Day	6% 6% 3 8% 7% 7% 7% 7% 9% 10% 30%	2600
July	1st to 10th	Day	7% 8% 4 12% 9% 9% 9% 7% 10% 9% 17%	5900
	11th to 20th	Day	3 4 1 7% 6% 7% 7% 6% 10% 15% 34%	5900
	21st to end	Day	4 4 3 8% 7% 7% 8% 6% 9% 13% 29%	6424
August	1st to 10th	Day	15% 6% 2 9% 7% 7% 7% 7% 8% 10% 22%	4234
	11th to 20th	Day	5% 4 2 7% 7% 6% 7% 6% 8% 12% 34%	4089
	21st to end	Day	10% 8% 3 9% 7% 7% 7% 5% 7% 10% 27%	4034
September	1st to 10th	Day	11% 7% 3 9% 7% 7% 7% 6% 8% 9% 27%	2200
	11th to 20th	Day	12% 8% 3 10% 6% 5% 7% 5% 7% 8% 30%	2200
	21st to end	Day	12% 6% 3 8% 5% 6% 6% 4 5% 8% 38%	2200
October	1st to 10th	Day	13% 7% 2 7% 4 6% 4 4 6% 6% 42%	2198
	11th to 20th	Day	8% 4 2 5% 4 3 3 3 4 7% 57%	2000
	21st to end	Day	8% 6% 2 6% 3 4 4 3 5% 7% 52%	2200
November	1st to 10th	Day	10% 6% 2 4 4 4 4 3 4 6% 52%	2057
	11th to 20th	Day	9% 7% 2 5% 4 3 3 3 5% 5% 55%	1963
	21st to end	Day	12% 6% 2 6% 4 4 3 3 5% 6% 49%	1800
December	1st to 10th	Day	8% 5% 2 5% 4 4 4 3 5% 6% 54%	2930
	11th to 20th	Day	13% 8% 2 7% 4 4 4 3 5% 7% 43%	3373
	21st to end	Day	15% 10% 3 7% 4 4 3 3 4 5% 41%	4466
January	1st to 10th	Night	9% 5% 2 5% 4 3 3 3 4 6% 56%	5889
	11th to 20th	Night	12% 7% 3 7% 4 5% 5% 4 5% 7% 42%	5900
	21st to end	Night	13% 6% 3 7% 4 3 4 3 5% 7% 46%	6422
February	1st to 10th	Night	13% 7% 3 6% 4 5% 4 3 5% 6% 44%	2400
	11th to 20th	Night	13% 7% 2 5% 5% 4 3 3 5% 6% 47%	2338
	21st to end	Night	11% 7% 2 4 4 4 4 3 5% 7% 49%	1966
March	1st to 10th	Night	20% 9% 3 5% 3 3 3 3 4 6% 42%	4918
	11th to 20th	Night	7% 5% 1 4 3 3 4 4 7% 9% 52%	4980
	21st to end	Night	10% 6% 2 5% 3 3 4 3 5% 7% 50%	5467
April	1st to 10th	Night	9% 4 2 5% 4 4 4 4 5% 8% 51%	2200
	11th to 20th	Night	8% 5% 2 5% 5% 4 4 3 5% 7% 53%	2135
	21st to end	Night	6% 4 1 4 3 4 3 4 6% 7% 57%	1855
May	1st to 10th	Night	6% 6% 3 7% 5% 5% 5% 5% 6% 10% 43%	4033
	11th to 20th	Night	12% 6% 2 5% 4 5% 5% 4 7% 9% 41%	4032
	21st to end	Night	5% 4 2 6% 5% 5% 5% 4 7% 12% 46%	4421
June	1st to 10th	Night	8% 6% 3 7% 7% 5% 6% 6% 10% 11% 31%	1800
	11th to 20th	Night	5% 5% 2 6% 6% 6% 6% 6% 8% 12% 39%	1800
	21st to end	Night	6% 5% 2 6% 6% 6% 6% 7% 9% 13% 34%	1800
July	1st to 10th	Night	8% 9% 5% 11% 8% 7% 7% 6% 8% 10% 21%	4058
	11th to 20th	Night	3 6% 3 8% 7% 7% 8% 7% 10% 14% 28%	4057
	21st to end	Night	5% 7% 3 9% 7% 7% 8% 6% 10% 12% 29%	4427
August	1st to 10th	Night	13% 5% 3 8% 6% 6% 6% 6% 9% 12% 26%	2915
	11th to 20th	Night	4 4 2 6% 5% 6% 6% 6% 10% 13% 39%	2941
	21st to end	Night	8% 7% 3 7% 4 6% 6% 5% 8% 12% 35%	3817
September	1st to 10th	Night	11% 7% 3 6% 6% 6% 6% 5% 7% 11% 32%	2200
	11th to 20th	Night	10% 7% 3 8% 6% 5% 5% 4 7% 10% 33%	2200
	21st to end	Night	10% 6% 2 7% 5% 5% 5% 4 6% 9% 42%	2200
October	1st to 10th	Night	12% 7% 2 6% 4 4 4 3 5% 7% 47%	2200
	11th to 20th	Night	9% 5% 2 5% 3 3 4 2 4 5% 59%	2400
	21st to end	Night	8% 5% 2 6% 4 3 4 3 4 6% 54%	2640
November	1st to 10th	Night	11% 5% 2 5% 4 4 4 3 4 7% 52%	2461
	11th to 20th	Night	11% 6% 2 5% 4 3 3 3 4 6% 53%	2587
	21st to end	Night	12% 7% 3 4 4 4 3 3 5% 7% 48%	2600
December	1st to 10th	Night	10% 5% 2 5% 4 3 3 2 4 6% 56%	4250
	11th to 20th	Night	13% 9% 3 6% 3 3 4 3 4 5% 46%	4822
	21st to end	Night	14% 9% 3 7% 4 4 4 3 4 5% 43%	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	32% 3 5% 15% 32% 13%	4057
	11th to 20th	Day	40% 4 5% 13% 21% 16%	4060
	21st to end	Day	37% 4 8% 19% 21% 12%	4530
February	1st to 10th	Day	43% 4 8% 16% 20% 10%	2000
	11th to 20th	Day	39% 4 6% 15% 26% 11%	1958
	21st to end	Day	38% 4 7% 18% 20% 14%	1662
March	1st to 10th	Day	46% 4 7% 15% 17% 10%	4935
	11th to 20th	Day	28% 5% 11% 16% 17% 23%	4980
	21st to end	Day	38% 4 8% 20% 17% 13%	5465
April	1st to 10th	Day	35% 6% 8% 20% 19% 12%	2200
	11th to 20th	Day	38% 4 7% 17% 23% 11%	2211
	21st to end	Day	29% 6% 10% 26% 21% 9%	2560
May	1st to 10th	Day	37% 7% 13% 26% 14% 3	5897
	11th to 20th	Day	39% 6% 13% 27% 12% 2	5865
	21st to end	Day	29% 7% 20% 23% 19% 1	6447
June	1st to 10th	Day	44% 8% 16% 18% 13% 1	2600
	11th to 20th	Day	38% 12% 18% 22% 10% 1	2600
	21st to end	Day	44% 12% 20% 15% 7% 1	2600
July	1st to 10th	Day	56% 12% 23% 8% 1	5835
	11th to 20th	Day	35% 11% 36% 16% 2	5831
	21st to end	Day	41% 12% 24% 20% 3	6240
August	1st to 10th	Day	52% 10% 22% 13% 2	4221
	11th to 20th	Day	37% 11% 19% 24% 9%	4128
	21st to end	Day	49% 10% 17% 21% 3 1	4034
September	1st to 10th	Day	49% 11% 14% 15% 10% 2	2200
	11th to 20th	Day	49% 9% 11% 18% 10% 2	2200
	21st to end	Day	44% 7% 11% 18% 16% 4	2200
October	1st to 10th	Day	47% 5% 6% 11% 16% 16%	3575
	11th to 20th	Day	18% 3 4 17% 32% 26%	3240
	21st to end	Day	24% 4 4 17% 34% 16%	3538
November	1st to 10th	Day	33% 4 9% 16% 23% 14%	2057
	11th to 20th	Day	32% 4 6% 18% 27% 14%	1963
	21st to end	Day	36% 4 8% 19% 23% 10%	1800
December	1st to 10th	Day	32% 4 8% 17% 25% 14%	2930
	11th to 20th	Day	40% 4 8% 21% 21% 6%	3370
	21st to end	Day	46% 4 5% 18% 23% 4	4466
January	1st to 10th	Night	31% 3 5% 13% 36% 12%	5889
	11th to 20th	Night	42% 4 5% 14% 26% 9%	5900
	21st to end	Night	39% 4 8% 16% 22% 11%	6422
February	1st to 10th	Night	41% 4 7% 17% 20% 11%	2400
	11th to 20th	Night	39% 4 8% 16% 19% 13%	2339
	21st to end	Night	35% 4 8% 21% 17% 15%	1966
March	1st to 10th	Night	44% 4 8% 16% 15% 12%	4918
	11th to 20th	Night	28% 5% 9% 18% 20% 21%	4980
	21st to end	Night	33% 4 10% 17% 22% 14%	5467
April	1st to 10th	Night	31% 6% 12% 20% 18% 13%	2200
	11th to 20th	Night	31% 4 8% 22% 22% 13%	2135
	21st to end	Night	25% 5% 13% 27% 22% 8%	1855
May	1st to 10th	Night	35% 8% 15% 26% 12% 4	4060
	11th to 20th	Night	38% 8% 18% 25% 9% 2	4033
	21st to end	Night	30% 7% 17% 29% 16% 2	4429
June	1st to 10th	Night	41% 10% 18% 19% 11% 1	1800
	11th to 20th	Night	35% 13% 22% 21% 9%	1800
	21st to end	Night	36% 13% 25% 18% 6% 1	1800
July	1st to 10th	Night	54% 12% 24% 8% 2	4015
	11th to 20th	Night	41% 13% 33% 12% 2	4006
	21st to end	Night	44% 13% 23% 18% 2	4297
August	1st to 10th	Night	47% 10% 30% 11% 2	2904
	11th to 20th	Night	32% 11% 25% 25% 7%	2968
	21st to end	Night	40% 9% 25% 23% 3 1	3817
September	1st to 10th	Night	43% 12% 20% 14% 10% 2	2200
	11th to 20th	Night	44% 11% 15% 18% 11% 2	2200
	21st to end	Night	37% 7% 15% 21% 15% 4	2200
October	1st to 10th	Night	43% 4 9% 13% 18% 13%	3590
	11th to 20th	Night	18% 3 4 16% 32% 27%	3899
	21st to end	Night	23% 4 5% 17% 34% 17%	4252
November	1st to 10th	Night	33% 4 8% 18% 22% 15%	2461
	11th to 20th	Night	34% 3 8% 16% 25% 14%	2587
	21st to end	Night	36% 4 9% 19% 21% 11%	2600
December	1st to 10th	Night	31% 3 9% 17% 25% 15%	4250
	11th to 20th	Night	41% 4 8% 18% 19% 9%	4824
	21st to end	Night	44% 4 8% 17% 23% 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	12% 23% 42% 17% 5% 1	300
	11th to 20th	Day	13% 18% 37% 21% 8% 3	300
	21st to end	Day	19% 22% 43% 12% 4	330
February	1st to 10th	Day	18% 15% 40% 21% 6% 1	300
	11th to 20th	Day	22% 17% 37% 18% 5%	300
	21st to end	Day	18% 16% 40% 21% 4	261
March	1st to 10th	Day	15% 16% 32% 25% 11% 1	500
	11th to 20th	Day	14% 14% 36% 23% 11% 2	500
	21st to end	Day	16% 14% 33% 25% 11% 2	550
April	1st to 10th	Day	14% 15% 28% 28% 14% 1	500
	11th to 20th	Day	12% 12% 30% 27% 14% 5%	492
	21st to end	Day	8% 8% 25% 31% 20% 9%	500
May	1st to 10th	Day	5% 13% 27% 26% 22% 7%	503
	11th to 20th	Day	8% 4 24% 30% 22% 13%	527
	21st to end	Day	9% 3 18% 23% 32% 15%	573
June	1st to 10th	Day	11% 3 14% 28% 27% 16%	530
	11th to 20th	Day	8% 3 12% 25% 29% 22%	530
	21st to end	Day	8% 3 9% 26% 32% 22%	530
July	1st to 10th	Day	7% 2 8% 20% 34% 29%	525
	11th to 20th	Day	7% 2 3 17% 38% 33%	524
	21st to end	Day	7% 2 6% 22% 39% 24%	576
August	1st to 10th	Day	14% 2 10% 19% 29% 27%	526
	11th to 20th	Day	7% 3 5% 17% 34% 34%	519
	21st to end	Day	12% 3 11% 22% 28% 23%	583
September	1st to 10th	Day	13% 4 13% 20% 31% 19%	530
	11th to 20th	Day	15% 2 15% 28% 29% 11%	530
	21st to end	Day	14% 2 12% 26% 32% 14%	530
October	1st to 10th	Day	15% 4 26% 29% 20% 6%	530
	11th to 20th	Day	9% 7% 22% 32% 23% 8%	530
	21st to end	Day	12% 7% 25% 29% 24% 3	583
November	1st to 10th	Day	18% 6% 24% 29% 19% 5%	535
	11th to 20th	Day	17% 9% 37% 24% 11% 3	421
	21st to end	Day	14% 13% 32% 30% 8% 2	300
December	1st to 10th	Day	14% 15% 36% 24% 9% 2	300
	11th to 20th	Day	19% 13% 37% 23% 8%	300
	21st to end	Day	19% 10% 32% 29% 9% 1	330
January	1st to 10th	Night	14% 14% 36% 29% 6% 1	800
	11th to 20th	Night	14% 10% 31% 34% 10% 1	800
	21st to end	Night	19% 11% 38% 26% 5%	880
February	1st to 10th	Night	17% 11% 31% 34% 8%	800
	11th to 20th	Night	17% 14% 31% 34% 5%	783
	21st to end	Night	15% 11% 34% 36% 4	660
March	1st to 10th	Night	14% 12% 32% 36% 7%	800
	11th to 20th	Night	14% 10% 36% 30% 11% 1	800
	21st to end	Night	12% 11% 35% 34% 9%	880
April	1st to 10th	Night	11% 11% 35% 31% 11% 1	800
	11th to 20th	Night	10% 9% 34% 35% 12% 1	791
	21st to end	Night	7% 5% 27% 42% 19%	655
May	1st to 10th	Night	8% 4 26% 45% 17% 1	600
	11th to 20th	Night	8% 3 21% 40% 24% 3	591
	21st to end	Night	9% 2 13% 33% 39% 4	650
June	1st to 10th	Night	10% 2 13% 37% 36% 3	600
	11th to 20th	Night	7% 2 10% 34% 37% 11%	600
	21st to end	Night	7% 2 9% 33% 42% 8%	600
July	1st to 10th	Night	8% 2 7% 28% 42% 14%	585
	11th to 20th	Night	7% 1 6% 20% 51% 15%	582
	21st to end	Night	5% 1 6% 30% 48% 11%	657
August	1st to 10th	Night	9% 1 6% 28% 44% 12%	597
	11th to 20th	Night	5% 2 4 20% 55% 14%	594
	21st to end	Night	12% 2 12% 27% 36% 12%	800
September	1st to 10th	Night	13% 2 11% 28% 38% 9%	800
	11th to 20th	Night	13% 3 13% 34% 33% 5%	800
	21st to end	Night	14% 2 13% 32% 35% 4	800
October	1st to 10th	Night	15% 3 21% 33% 25% 3	800
	11th to 20th	Night	11% 4 22% 34% 26% 3	800
	21st to end	Night	9% 5% 25% 35% 24% 1	880
November	1st to 10th	Night	12% 5% 24% 38% 19% 1	820
	11th to 20th	Night	14% 9% 27% 34% 14% 1	829
	21st to end	Night	15% 9% 29% 33% 13%	800
December	1st to 10th	Night	14% 8% 31% 33% 14% 1	800
	11th to 20th	Night	17% 9% 29% 32% 13% 1	800
	21st to end	Night	18% 10% 29% 31% 11%	880

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