Honeymoon Island State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Honeymoon Island State Park clear sky chart from 2005-11-06 to 2026-03-18.

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	7% 5% 2 6% 4 5% 5% 5% 8% 11% 43%	131472
	Night	8% 5% 2 6% 5% 5% 5% 4 7% 9% 44%	130019
Transparency	Day	20% 41% 13% 14% 9% 3	135245
	Night	22% 40% 12% 13% 10% 3	134316
Seeing	Day	7% 4 15% 27% 29% 17%	17187
	Night	8% 4 17% 33% 28% 10%	27287

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	7% 6% 2 5% 3 4 4 4 6% 8% 51%	5258
	11th to 20th	Day	18% 8% 3 8% 5% 4 4 4 5% 7% 33%	5280
	21st to end	Day	11% 6% 2 5% 3 4 4 4 6% 8% 46%	6376
February	1st to 10th	Day	12% 6% 1 6% 3 3 3 4 6% 8% 48%	2100
	11th to 20th	Day	8% 4 2 5% 3 4 3 3 6% 6% 55%	2048
	21st to end	Day	7% 5% 2 5% 3 3 3 4 5% 7% 55%	1751
March	1st to 10th	Day	7% 5% 2 7% 4 4 4 3 6% 9% 48%	5045
	11th to 20th	Day	6% 3 1 4 3 3 3 3 6% 8% 60%	5057
	21st to end	Day	8% 4 2 5% 3 4 4 4 6% 10% 51%	5465
April	1st to 10th	Day	6% 3 2 4 3 3 5% 3 6% 11% 54%	2200
	11th to 20th	Day	8% 4 2 6% 5% 4 4 4 6% 9% 50%	2176
	21st to end	Day	4 2 1 4 4 3 4 4 7% 10% 57%	2419
May	1st to 10th	Day	3 3 1 3 2 3 4 4 7% 11% 58%	5862
	11th to 20th	Day	8% 4 2 5% 4 4 4 4 6% 9% 50%	5861
	21st to end	Day	4 3 1 3 3 3 4 4 7% 12% 54%	6433
June	1st to 10th	Day	10% 6% 3 7% 5% 6% 7% 5% 8% 11% 32%	2600
	11th to 20th	Day	5% 4 2 6% 6% 7% 7% 6% 10% 13% 33%	2600
	21st to end	Day	6% 6% 2 7% 6% 7% 7% 7% 11% 13% 30%	2600
July	1st to 10th	Day	5% 5% 2 7% 7% 7% 8% 8% 12% 16% 24%	5900
	11th to 20th	Day	3 3 2 7% 6% 8% 9% 8% 12% 16% 25%	5900
	21st to end	Day	3 4 2 7% 6% 6% 8% 7% 11% 16% 29%	6424
August	1st to 10th	Day	7% 5% 2 7% 5% 8% 8% 6% 9% 14% 29%	4116
	11th to 20th	Day	4 4 2 6% 4 6% 7% 6% 9% 13% 39%	3849
	21st to end	Day	6% 5% 3 8% 7% 7% 7% 8% 11% 14% 26%	3992
September	1st to 10th	Day	7% 6% 3 8% 7% 6% 8% 8% 12% 13% 23%	2200
	11th to 20th	Day	10% 6% 3 8% 6% 7% 6% 6% 9% 11% 30%	2200
	21st to end	Day	6% 6% 3 9% 5% 6% 7% 5% 8% 11% 34%	2200
October	1st to 10th	Day	9% 6% 2 7% 6% 5% 7% 4 7% 11% 36%	2200
	11th to 20th	Day	7% 4 1 5% 3 5% 5% 4 6% 9% 53%	2072
	21st to end	Day	6% 4 2 5% 4 4 4 3 6% 10% 50%	2200
November	1st to 10th	Day	8% 5% 1 5% 4 4 4 4 5% 8% 52%	2057
	11th to 20th	Day	8% 5% 2 5% 5% 4 4 4 5% 7% 51%	2093
	21st to end	Day	7% 5% 1 6% 3 3 5% 5% 7% 9% 49%	1890
December	1st to 10th	Day	4 4 2 5% 3 3 4 3 5% 9% 58%	3020
	11th to 20th	Day	8% 5% 2 6% 4 4 4 4 6% 8% 49%	3463
	21st to end	Day	12% 7% 3 8% 5% 5% 5% 3 5% 7% 40%	4565
January	1st to 10th	Night	7% 5% 2 6% 4 4 3 3 4 8% 53%	7635
	11th to 20th	Night	19% 9% 3 8% 5% 4 4 3 6% 7% 31%	7680
	21st to end	Night	13% 6% 2 6% 4 4 4 4 6% 8% 44%	7787
February	1st to 10th	Night	11% 8% 2 5% 4 3 4 4 5% 7% 48%	2520
	11th to 20th	Night	8% 7% 2 5% 4 4 4 3 5% 8% 50%	2458
	21st to end	Night	7% 6% 2 6% 4 4 3 3 5% 7% 53%	2053
March	1st to 10th	Night	10% 6% 3 7% 5% 4 5% 3 5% 7% 45%	5028
	11th to 20th	Night	5% 3 1 4 3 4 3 4 7% 9% 58%	5058
	21st to end	Night	9% 5% 2 5% 4 4 4 4 5% 8% 50%	5467
April	1st to 10th	Night	6% 4 2 5% 3 3 4 4 7% 11% 51%	2200
	11th to 20th	Night	5% 4 2 6% 4 5% 5% 3 6% 9% 51%	2173
	21st to end	Night	6% 3 2 4 4 3 4 3 5% 8% 59%	1991
May	1st to 10th	Night	3 2 1 4 3 4 4 4 7% 10% 58%	4033
	11th to 20th	Night	8% 4 2 5% 4 4 4 4 5% 8% 53%	4032
	21st to end	Night	3 2 2 4 3 4 4 4 7% 9% 58%	4421
June	1st to 10th	Night	10% 6% 2 8% 4 5% 4 3 7% 10% 41%	1800
	11th to 20th	Night	5% 4 2 7% 6% 5% 6% 6% 10% 11% 39%	1800
	21st to end	Night	6% 5% 2 6% 6% 6% 6% 6% 9% 13% 35%	1800
July	1st to 10th	Night	5% 5% 3 10% 6% 7% 8% 6% 10% 15% 24%	4058
	11th to 20th	Night	3 4 2 7% 7% 8% 8% 7% 11% 15% 29%	4057
	21st to end	Night	4 5% 2 8% 7% 8% 9% 7% 12% 15% 24%	4427
August	1st to 10th	Night	6% 4 2 6% 5% 6% 7% 6% 10% 12% 37%	3027
	11th to 20th	Night	4 3 2 5% 4 5% 6% 5% 10% 16% 41%	3200
	21st to end	Night	7% 6% 3 8% 7% 7% 7% 6% 9% 13% 28%	3870
September	1st to 10th	Night	6% 6% 3 10% 7% 7% 7% 7% 10% 12% 27%	2200
	11th to 20th	Night	8% 7% 3 10% 6% 6% 6% 4 9% 10% 30%	2200
	21st to end	Night	7% 7% 3 8% 5% 5% 6% 5% 7% 10% 38%	2200
October	1st to 10th	Night	10% 7% 2 7% 5% 5% 5% 5% 8% 8% 39%	2200
	11th to 20th	Night	6% 4 1 4 5% 5% 5% 4 6% 7% 54%	2325
	21st to end	Night	7% 6% 3 6% 4 4 4 3 5% 8% 50%	2640
November	1st to 10th	Night	8% 4 2 4 5% 4 4 3 5% 8% 52%	2461
	11th to 20th	Night	9% 5% 2 6% 4 4 4 4 4 8% 50%	2523
	21st to end	Night	7% 5% 2 6% 4 5% 4 4 7% 9% 47%	2730
December	1st to 10th	Night	5% 3 1 4 3 3 3 3 6% 9% 60%	4380
	11th to 20th	Night	10% 6% 2 5% 3 4 3 3 5% 7% 50%	4952
	21st to end	Night	13% 8% 3 8% 5% 5% 5% 4 6% 7% 36%	6633

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	23% 24% 9% 16% 20% 8%	5259
	11th to 20th	Day	44% 23% 5% 10% 10% 8%	5280
	21st to end	Day	26% 26% 8% 22% 11% 7%	6376
February	1st to 10th	Day	12% 62% 5% 8% 9% 5%	2100
	11th to 20th	Day	10% 58% 4 11% 13% 4	2058
	21st to end	Day	12% 60% 6% 8% 10% 4	1751
March	1st to 10th	Day	25% 33% 11% 15% 12% 4	5045
	11th to 20th	Day	15% 30% 9% 17% 15% 14%	5057
	21st to end	Day	20% 31% 7% 23% 15% 4	5465
April	1st to 10th	Day	8% 64% 7% 10% 8% 3	2200
	11th to 20th	Day	9% 64% 5% 6% 11% 5%	2176
	21st to end	Day	8% 63% 6% 11% 11% 1	2419
May	1st to 10th	Day	14% 34% 21% 20% 9% 2	5897
	11th to 20th	Day	21% 32% 15% 23% 9% 1	5865
	21st to end	Day	11% 32% 17% 28% 11% 1	6447
June	1st to 10th	Day	15% 65% 10% 8% 2	2600
	11th to 20th	Day	15% 68% 9% 7%	2600
	21st to end	Day	11% 68% 13% 8% 1	2600
July	1st to 10th	Day	27% 40% 30% 3	5835
	11th to 20th	Day	26% 40% 29% 5%	5831
	21st to end	Day	25% 40% 21% 14%	6240
August	1st to 10th	Day	25% 43% 20% 9% 3	4103
	11th to 20th	Day	13% 43% 22% 19% 3	3885
	21st to end	Day	23% 46% 21% 10%	3992
September	1st to 10th	Day	18% 65% 9% 7% 1	2200
	11th to 20th	Day	16% 60% 13% 7% 3	2200
	21st to end	Day	16% 61% 9% 10% 3 1	2200
October	1st to 10th	Day	42% 43% 7% 5% 2	3590
	11th to 20th	Day	11% 37% 6% 13% 28% 5%	3351
	21st to end	Day	15% 38% 6% 17% 20% 4	3538
November	1st to 10th	Day	14% 55% 7% 12% 8% 4	2057
	11th to 20th	Day	16% 56% 5% 11% 7% 6%	2093
	21st to end	Day	14% 55% 4 13% 9% 4	1890
December	1st to 10th	Day	13% 36% 11% 19% 16% 5%	3020
	11th to 20th	Day	21% 33% 10% 13% 14% 9%	3460
	21st to end	Day	33% 30% 9% 17% 9% 3	4565
January	1st to 10th	Night	22% 23% 8% 19% 23% 4	7636
	11th to 20th	Night	45% 23% 7% 9% 10% 6%	7680
	21st to end	Night	29% 25% 9% 16% 13% 7%	7787
February	1st to 10th	Night	14% 60% 5% 9% 8% 3	2520
	11th to 20th	Night	12% 58% 4 10% 12% 3	2459
	21st to end	Night	13% 59% 6% 8% 12% 3	2053
March	1st to 10th	Night	31% 32% 8% 12% 11% 6%	5028
	11th to 20th	Night	13% 31% 15% 13% 14% 14%	5058
	21st to end	Night	25% 31% 6% 19% 16% 3	5467
April	1st to 10th	Night	9% 63% 7% 11% 7% 2	2200
	11th to 20th	Night	9% 63% 5% 9% 9% 4	2173
	21st to end	Night	9% 62% 7% 11% 10% 2	1991
May	1st to 10th	Night	15% 34% 19% 23% 8% 2	4060
	11th to 20th	Night	20% 31% 13% 22% 12% 1	4033
	21st to end	Night	12% 32% 15% 30% 10%	4429
June	1st to 10th	Night	13% 64% 11% 10% 1	1800
	11th to 20th	Night	15% 67% 11% 6%	1800
	21st to end	Night	11% 66% 13% 8% 2	1800
July	1st to 10th	Night	33% 37% 27% 3	4015
	11th to 20th	Night	27% 40% 30% 4	4006
	21st to end	Night	35% 37% 20% 9%	4297
August	1st to 10th	Night	24% 43% 20% 9% 4	3016
	11th to 20th	Night	13% 44% 24% 19% 1	3230
	21st to end	Night	26% 46% 19% 7% 2	3870
September	1st to 10th	Night	20% 63% 10% 6% 1	2200
	11th to 20th	Night	16% 62% 11% 9% 2	2200
	21st to end	Night	16% 60% 10% 10% 3	2200
October	1st to 10th	Night	44% 41% 7% 5% 3	3590
	11th to 20th	Night	11% 37% 6% 18% 24% 3	3785
	21st to end	Night	17% 38% 6% 16% 21% 3	4252
November	1st to 10th	Night	14% 55% 9% 11% 8% 4	2461
	11th to 20th	Night	16% 56% 4 8% 11% 5%	2523
	21st to end	Night	14% 56% 5% 12% 8% 5%	2730
December	1st to 10th	Night	11% 36% 13% 20% 11% 9%	4380
	11th to 20th	Night	21% 33% 8% 15% 15% 7%	4954
	21st to end	Night	35% 30% 11% 13% 9% 1	6633

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	8% 9% 37% 32% 13% 1	330
	11th to 20th	Day	9% 14% 28% 33% 13% 2	330
	21st to end	Day	15% 12% 36% 30% 7%	363
February	1st to 10th	Day	10% 9% 25% 37% 18% 2	330
	11th to 20th	Day	7% 8% 31% 33% 18% 2	330
	21st to end	Day	7% 6% 32% 34% 19% 2	294
March	1st to 10th	Day	5% 7% 33% 39% 15% 1	540
	11th to 20th	Day	10% 7% 27% 32% 21% 2	528
	21st to end	Day	6% 5% 25% 39% 22% 3	550
April	1st to 10th	Day	7% 7% 26% 37% 22% 1	500
	11th to 20th	Day	6% 7% 24% 37% 23% 3	492
	21st to end	Day	4 3 17% 35% 35% 6%	500
May	1st to 10th	Day	5% 4 15% 38% 30% 8%	503
	11th to 20th	Day	8% 3 12% 29% 34% 13%	527
	21st to end	Day	6% 1 8% 24% 41% 20%	573
June	1st to 10th	Day	11% 2 7% 23% 39% 19%	530
	11th to 20th	Day	5% 2 7% 19% 39% 28%	530
	21st to end	Day	4 2 3 15% 35% 42%	530
July	1st to 10th	Day	5% 1 3 12% 31% 48%	525
	11th to 20th	Day	4 1 3 11% 34% 47%	524
	21st to end	Day	8% 1 4 14% 35% 39%	576
August	1st to 10th	Day	6% 1 4 12% 36% 41%	526
	11th to 20th	Day	7% 1 4 9% 32% 47%	519
	21st to end	Day	9% 2 4 16% 35% 34%	583
September	1st to 10th	Day	8% 3 4 16% 36% 34%	530
	11th to 20th	Day	10% 2 5% 22% 38% 23%	530
	21st to end	Day	6% 3 6% 21% 40% 24%	530
October	1st to 10th	Day	13% 2 14% 28% 35% 8%	530
	11th to 20th	Day	6% 4 13% 32% 36% 10%	530
	21st to end	Day	7% 4 16% 34% 33% 6%	583
November	1st to 10th	Day	9% 4 17% 32% 32% 6%	535
	11th to 20th	Day	10% 7% 17% 37% 25% 4	533
	21st to end	Day	6% 6% 25% 35% 25% 4	330
December	1st to 10th	Day	5% 9% 28% 34% 20% 4	330
	11th to 20th	Day	12% 6% 28% 35% 18% 2	330
	21st to end	Day	8% 7% 23% 35% 23% 3	363
January	1st to 10th	Night	10% 7% 29% 35% 17% 1	840
	11th to 20th	Night	12% 9% 24% 38% 17% 1	840
	21st to end	Night	13% 9% 30% 35% 13%	924
February	1st to 10th	Night	13% 6% 24% 40% 17%	840
	11th to 20th	Night	9% 8% 27% 38% 17% 1	823
	21st to end	Night	10% 5% 25% 43% 17%	692
March	1st to 10th	Night	6% 6% 29% 46% 13%	840
	11th to 20th	Night	8% 6% 24% 38% 23% 1	829
	21st to end	Night	7% 3 28% 43% 18% 1	880
April	1st to 10th	Night	6% 5% 22% 45% 21% 1	800
	11th to 20th	Night	7% 4 23% 46% 18% 1	791
	21st to end	Night	7% 3 20% 44% 26%	721
May	1st to 10th	Night	5% 1 10% 45% 35% 4	600
	11th to 20th	Night	7% 2 11% 39% 35% 6%	591
	21st to end	Night	5% 1 8% 33% 44% 9%	650
June	1st to 10th	Night	11% 2 6% 24% 45% 12%	600
	11th to 20th	Night	5% 1 6% 19% 42% 27%	600
	21st to end	Night	5% 1 4 14% 44% 32%	600
July	1st to 10th	Night	6% 1 2 8% 40% 43%	585
	11th to 20th	Night	4 1 1 10% 38% 45%	582
	21st to end	Night	4 1 3 10% 44% 39%	657
August	1st to 10th	Night	5% 1 3 8% 45% 38%	597
	11th to 20th	Night	5% 1 2 9% 40% 43%	594
	21st to end	Night	9% 2 4 18% 42% 25%	827
September	1st to 10th	Night	7% 1 6% 20% 43% 22%	800
	11th to 20th	Night	10% 1 9% 26% 40% 15%	800
	21st to end	Night	8% 3 8% 27% 42% 12%	800
October	1st to 10th	Night	11% 3 16% 37% 28% 5%	800
	11th to 20th	Night	6% 3 14% 39% 35% 4	800
	21st to end	Night	9% 4 20% 38% 27% 2	880
November	1st to 10th	Night	9% 4 20% 42% 23% 3	820
	11th to 20th	Night	9% 4 20% 43% 22% 2	840
	21st to end	Night	7% 6% 23% 40% 23% 1	840
December	1st to 10th	Night	10% 4 24% 36% 25% 2	840
	11th to 20th	Night	9% 5% 25% 38% 21% 2	840
	21st to end	Night	10% 6% 24% 36% 22% 2	924

Page generated at 2026-03-15 02:23:55. Version ac07

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