Palm Coast
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Palm Coast clear sky chart from 2005-11-06 to 2024-11-01.

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	9% 5% 2 6% 5% 5% 6% 5% 7% 10% 40%	100906
	Night	10% 6% 2 6% 5% 5% 5% 4 7% 9% 41%	98006
Transparency	Day	18% 51% 12% 11% 6% 2	100718
	Night	20% 51% 11% 10% 6% 2	97865
Seeing	Day	9% 3 13% 27% 31% 17%	15567
	Night	11% 4 16% 29% 31% 10%	25635

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	14% 7% 2 7% 4 4 4 3 6% 6% 43%	2836
	11th to 20th	Day	19% 11% 4 6% 4 4 4 3 5% 6% 34%	2840
	21st to end	Day	12% 6% 2 6% 5% 4 4 3 5% 7% 44%	3124
February	1st to 10th	Day	13% 8% 2 7% 4 4 4 4 6% 6% 42%	1881
	11th to 20th	Day	11% 5% 3 5% 4 4 3 3 5% 7% 50%	1848
	21st to end	Day	10% 5% 2 5% 3 4 5% 4 6% 7% 47%	1691
March	1st to 10th	Day	11% 7% 3 8% 5% 5% 5% 4 6% 9% 38%	3435
	11th to 20th	Day	7% 4 2 5% 3 4 4 4 6% 10% 53%	3480
	21st to end	Day	13% 6% 2 6% 4 4 4 4 6% 7% 46%	3815
April	1st to 10th	Day	8% 5% 1 5% 4 4 5% 4 6% 8% 50%	2090
	11th to 20th	Day	9% 4 2 6% 5% 4 5% 4 7% 9% 44%	2151
	21st to end	Day	6% 3 1 4 3 4 5% 4 6% 8% 55%	2280
May	1st to 10th	Day	4 2 1 3 3 3 4 4 6% 10% 61%	4003
	11th to 20th	Day	10% 4 2 7% 5% 6% 6% 5% 8% 8% 39%	4081
	21st to end	Day	5% 3 1 4 3 4 5% 4 8% 11% 51%	4476
June	1st to 10th	Day	10% 6% 3 7% 5% 5% 7% 5% 10% 12% 30%	2470
	11th to 20th	Day	5% 5% 2 7% 6% 6% 9% 6% 9% 12% 34%	2470
	21st to end	Day	9% 5% 3 8% 6% 6% 8% 5% 9% 11% 31%	2470
July	1st to 10th	Day	6% 5% 2 5% 5% 6% 7% 7% 11% 15% 32%	4120
	11th to 20th	Day	4 4 2 7% 6% 7% 8% 7% 11% 16% 29%	4120
	21st to end	Day	4 4 2 6% 6% 6% 7% 7% 10% 15% 33%	4466
August	1st to 10th	Day	6% 5% 2 8% 7% 7% 7% 6% 9% 12% 31%	4104
	11th to 20th	Day	4 4 2 6% 5% 6% 7% 6% 9% 13% 36%	3930
	21st to end	Day	8% 5% 2 7% 5% 6% 7% 6% 8% 14% 31%	3902
September	1st to 10th	Day	8% 7% 3 10% 7% 7% 8% 6% 10% 11% 23%	2090
	11th to 20th	Day	10% 6% 3 9% 7% 6% 8% 6% 9% 10% 26%	2090
	21st to end	Day	12% 6% 3 8% 6% 6% 7% 5% 7% 9% 32%	2090
October	1st to 10th	Day	14% 6% 3 7% 5% 5% 6% 5% 6% 9% 34%	2028
	11th to 20th	Day	7% 5% 2 5% 4 5% 5% 4 7% 8% 47%	1900
	21st to end	Day	10% 3 2 6% 3 4 5% 4 6% 9% 48%	2090
November	1st to 10th	Day	10% 5% 2 6% 4 4 6% 5% 7% 7% 43%	1857
	11th to 20th	Day	11% 7% 3 7% 4 5% 5% 5% 6% 7% 39%	1900
	21st to end	Day	12% 6% 3 7% 5% 5% 5% 4 5% 7% 41%	1791
December	1st to 10th	Day	9% 5% 2 6% 4 6% 4 3 6% 9% 46%	1710
	11th to 20th	Day	14% 7% 2 6% 6% 4 5% 3 6% 8% 38%	2153
	21st to end	Day	14% 7% 3 7% 5% 4 5% 3 6% 7% 40%	3124
January	1st to 10th	Night	14% 8% 2 7% 5% 4 4 4 5% 7% 42%	4109
	11th to 20th	Night	16% 10% 3 8% 4 4 4 3 5% 8% 35%	4120
	21st to end	Night	13% 6% 2 7% 5% 4 5% 4 5% 7% 41%	4532
February	1st to 10th	Night	13% 6% 2 5% 5% 4 4 4 5% 7% 46%	2295
	11th to 20th	Night	11% 6% 2 5% 4 4 4 3 6% 6% 49%	2218
	21st to end	Night	9% 5% 2 5% 4 4 4 4 6% 7% 49%	1761
March	1st to 10th	Night	17% 9% 3 7% 4 3 3 3 5% 7% 40%	3418
	11th to 20th	Night	7% 3 1 5% 5% 4 5% 4 7% 10% 49%	3480
	21st to end	Night	14% 5% 2 7% 5% 4 4 3 4 6% 45%	3817
April	1st to 10th	Night	7% 4 1 5% 4 4 4 4 6% 9% 51%	2090
	11th to 20th	Night	9% 6% 2 6% 4 4 4 4 6% 7% 48%	1975
	21st to end	Night	7% 3 2 4 3 3 4 4 6% 11% 53%	1900
May	1st to 10th	Night	3 2 1 3 3 3 4 3 6% 10% 61%	2918
	11th to 20th	Night	9% 5% 2 6% 4 4 6% 5% 8% 10% 42%	2812
	21st to end	Night	4 3 1 3 3 4 4 4 6% 10% 58%	3079
June	1st to 10th	Night	10% 6% 2 5% 5% 5% 6% 5% 8% 12% 35%	1710
	11th to 20th	Night	5% 5% 3 5% 6% 5% 7% 6% 9% 12% 37%	1710
	21st to end	Night	7% 5% 2 7% 6% 5% 7% 5% 9% 12% 34%	1710
July	1st to 10th	Night	6% 5% 2 8% 5% 6% 6% 5% 10% 14% 34%	2840
	11th to 20th	Night	3 5% 2 5% 5% 5% 7% 6% 11% 16% 33%	2840
	21st to end	Night	5% 5% 3 7% 7% 7% 7% 6% 10% 13% 31%	3087
August	1st to 10th	Night	7% 6% 3 8% 6% 6% 6% 5% 9% 11% 33%	2825
	11th to 20th	Night	2 3 2 6% 6% 5% 7% 6% 9% 14% 40%	2866
	21st to end	Night	7% 6% 3 7% 5% 6% 5% 5% 8% 14% 35%	3748
September	1st to 10th	Night	9% 7% 3 9% 6% 7% 7% 6% 8% 10% 27%	2090
	11th to 20th	Night	12% 8% 4 8% 7% 6% 6% 5% 9% 10% 26%	2090
	21st to end	Night	11% 6% 3 8% 5% 6% 6% 5% 7% 8% 35%	2090
October	1st to 10th	Night	13% 6% 3 8% 5% 5% 5% 5% 7% 8% 35%	2152
	11th to 20th	Night	6% 4 2 5% 4 5% 5% 4 7% 9% 50%	2280
	21st to end	Night	9% 6% 2 6% 4 4 4 4 5% 7% 49%	2508
November	1st to 10th	Night	11% 6% 2 6% 5% 5% 4 4 6% 8% 44%	2228
	11th to 20th	Night	12% 6% 3 6% 5% 5% 5% 4 7% 7% 41%	2280
	21st to end	Night	11% 6% 2 5% 5% 5% 5% 4 6% 9% 40%	2384
December	1st to 10th	Night	10% 5% 2 6% 5% 4 4 4 6% 9% 45%	2470
	11th to 20th	Night	15% 8% 2 6% 4 4 4 3 4 6% 44%	3042
	21st to end	Night	17% 8% 3 7% 5% 4 4 4 6% 6% 37%	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	28% 38% 5% 10% 13% 6%	2837
	11th to 20th	Day	39% 38% 4 6% 7% 6%	2840
	21st to end	Day	22% 43% 6% 11% 11% 7%	3124
February	1st to 10th	Day	14% 66% 5% 5% 8% 2	1881
	11th to 20th	Day	11% 64% 4 8% 10% 3	1858
	21st to end	Day	14% 65% 4 6% 7% 4	1691
March	1st to 10th	Day	30% 47% 8% 10% 4 1	3435
	11th to 20th	Day	14% 42% 12% 14% 17% 1	3480
	21st to end	Day	22% 43% 7% 15% 7% 5%	3815
April	1st to 10th	Day	11% 66% 5% 8% 7% 3	2090
	11th to 20th	Day	12% 66% 3 10% 6% 3	2151
	21st to end	Day	8% 65% 5% 10% 10% 1	2280
May	1st to 10th	Day	7% 44% 16% 21% 8% 3	4040
	11th to 20th	Day	24% 46% 11% 15% 4 1	4085
	21st to end	Day	7% 43% 13% 27% 10% 1	4489
June	1st to 10th	Day	14% 69% 9% 6% 2	2470
	11th to 20th	Day	13% 68% 8% 9% 2	2470
	21st to end	Day	12% 67% 12% 6% 2	2470
July	1st to 10th	Day	17% 42% 29% 12% 1	4055
	11th to 20th	Day	18% 44% 34% 4	4051
	21st to end	Day	19% 44% 31% 6%	4324
August	1st to 10th	Day	27% 42% 23% 7% 1	4091
	11th to 20th	Day	16% 43% 21% 15% 4	3969
	21st to end	Day	20% 43% 20% 16% 1	3902
September	1st to 10th	Day	20% 65% 8% 3 3 1	2090
	11th to 20th	Day	18% 64% 9% 7% 2	2090
	21st to end	Day	16% 63% 8% 8% 5%	2090
October	1st to 10th	Day	20% 62% 5% 7% 5%	2028
	11th to 20th	Day	11% 60% 5% 11% 11% 2	1900
	21st to end	Day	10% 60% 5% 10% 11% 4	2090
November	1st to 10th	Day	15% 61% 7% 9% 6% 3	1857
	11th to 20th	Day	20% 60% 5% 6% 7% 2	1900
	21st to end	Day	18% 61% 4 9% 7% 2	1791
December	1st to 10th	Day	14% 61% 6% 11% 6% 1	1710
	11th to 20th	Day	21% 51% 4 6% 14% 5%	2150
	21st to end	Day	30% 39% 6% 13% 7% 4	3124
January	1st to 10th	Night	29% 38% 5% 10% 10% 7%	4109
	11th to 20th	Night	35% 39% 6% 11% 8% 2	4120
	21st to end	Night	24% 45% 7% 8% 10% 6%	4532
February	1st to 10th	Night	13% 65% 5% 7% 6% 3	2295
	11th to 20th	Night	12% 64% 3 10% 9% 2	2219
	21st to end	Night	13% 66% 6% 5% 7% 4	1761
March	1st to 10th	Night	33% 46% 8% 8% 4 1	3418
	11th to 20th	Night	15% 44% 14% 14% 11% 2	3480
	21st to end	Night	27% 44% 5% 7% 13% 5%	3817
April	1st to 10th	Night	11% 67% 5% 9% 5% 3	2090
	11th to 20th	Night	12% 66% 4 9% 7% 3	1975
	21st to end	Night	10% 65% 6% 10% 8% 2	1900
May	1st to 10th	Night	7% 47% 18% 18% 7% 3	2947
	11th to 20th	Night	20% 48% 12% 15% 5%	2813
	21st to end	Night	6% 42% 12% 28% 11%	3087
June	1st to 10th	Night	14% 67% 12% 7% 1	1710
	11th to 20th	Night	13% 67% 10% 8% 2	1710
	21st to end	Night	14% 66% 9% 8% 3	1710
July	1st to 10th	Night	21% 41% 27% 12%	2795
	11th to 20th	Night	19% 46% 31% 4	2786
	21st to end	Night	28% 41% 26% 5%	2988
August	1st to 10th	Night	29% 39% 25% 7%	2814
	11th to 20th	Night	16% 42% 19% 17% 6%	2893
	21st to end	Night	21% 42% 22% 14% 1	3748
September	1st to 10th	Night	22% 63% 7% 4 3 1	2090
	11th to 20th	Night	17% 63% 9% 8% 3	2090
	21st to end	Night	16% 62% 7% 11% 4	2090
October	1st to 10th	Night	21% 63% 5% 6% 4 1	2152
	11th to 20th	Night	12% 60% 5% 10% 11% 3	2280
	21st to end	Night	11% 60% 5% 9% 12% 3	2508
November	1st to 10th	Night	15% 61% 6% 9% 6% 3	2228
	11th to 20th	Night	19% 61% 4 7% 6% 3	2280
	21st to end	Night	17% 60% 4 9% 7% 2	2384
December	1st to 10th	Night	15% 60% 7% 12% 5% 1	2470
	11th to 20th	Night	20% 50% 4 8% 12% 5%	3044
	21st to end	Night	32% 42% 8% 9% 8% 2	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	12% 5% 26% 45% 11% 1	270
	11th to 20th	Day	8% 6% 29% 39% 17% 2	270
	21st to end	Day	15% 9% 31% 39% 5%	297
February	1st to 10th	Day	15% 9% 16% 39% 18% 2	270
	11th to 20th	Day	11% 4 23% 46% 13% 3	270
	21st to end	Day	12% 4 23% 38% 19% 3	346
March	1st to 10th	Day	9% 5% 28% 39% 18% 2	460
	11th to 20th	Day	12% 4 25% 36% 20% 3	460
	21st to end	Day	9% 5% 19% 42% 22% 3	506
April	1st to 10th	Day	10% 5% 23% 39% 21% 3	460
	11th to 20th	Day	8% 6% 21% 38% 22% 6%	452
	21st to end	Day	5% 3 15% 36% 31% 9%	460
May	1st to 10th	Day	5% 3 14% 37% 35% 8%	463
	11th to 20th	Day	9% 2 10% 28% 36% 16%	487
	21st to end	Day	8% 1 5% 21% 42% 22%	529
June	1st to 10th	Day	10% 2 8% 23% 37% 21%	490
	11th to 20th	Day	4 2 6% 17% 43% 29%	490
	21st to end	Day	5% 2 3 14% 40% 36%	490
July	1st to 10th	Day	6% 1 5% 7% 35% 46%	485
	11th to 20th	Day	5% 1 2 4 40% 49%	484
	21st to end	Day	7% 5% 9% 40% 39%	532
August	1st to 10th	Day	6% 1 4 14% 39% 36%	486
	11th to 20th	Day	4 1 3 6% 38% 48%	479
	21st to end	Day	7% 2 5% 9% 40% 36%	539
September	1st to 10th	Day	10% 3 6% 10% 38% 33%	490
	11th to 20th	Day	11% 2 7% 17% 42% 22%	490
	21st to end	Day	11% 2 7% 16% 43% 21%	490
October	1st to 10th	Day	16% 2 13% 32% 29% 9%	490
	11th to 20th	Day	6% 2 11% 34% 38% 8%	490
	21st to end	Day	9% 4 11% 34% 34% 8%	539
November	1st to 10th	Day	10% 5% 16% 33% 29% 7%	455
	11th to 20th	Day	15% 5% 17% 38% 20% 4	460
	21st to end	Day	14% 5% 20% 38% 20% 2	351
December	1st to 10th	Day	8% 4 23% 35% 24% 5%	270
	11th to 20th	Day	15% 5% 21% 36% 20% 3	270
	21st to end	Day	10% 4 19% 39% 23% 4	297
January	1st to 10th	Night	15% 9% 27% 34% 14% 1	760
	11th to 20th	Night	11% 8% 26% 36% 18% 2	760
	21st to end	Night	16% 8% 30% 34% 11%	836
February	1st to 10th	Night	16% 6% 24% 34% 19% 1	760
	11th to 20th	Night	13% 6% 27% 38% 15% 1	743
	21st to end	Night	12% 4 23% 44% 16% 2	628
March	1st to 10th	Night	7% 7% 26% 41% 19% 1	760
	11th to 20th	Night	10% 4 21% 41% 19% 4	760
	21st to end	Night	9% 5% 22% 39% 23% 1	836
April	1st to 10th	Night	8% 3 24% 40% 21% 3	760
	11th to 20th	Night	10% 6% 20% 33% 30% 2	751
	21st to end	Night	7% 3 17% 40% 29% 3	760
May	1st to 10th	Night	5% 2 13% 39% 36% 5%	638
	11th to 20th	Night	8% 2 12% 29% 41% 9%	561
	21st to end	Night	7% 1 6% 26% 47% 13%	617
June	1st to 10th	Night	12% 1 6% 23% 45% 12%	570
	11th to 20th	Night	6% 2 4 19% 41% 27%	570
	21st to end	Night	6% 2 3 15% 50% 24%	570
July	1st to 10th	Night	7% 1 6% 11% 41% 34%	555
	11th to 20th	Night	6% 2 11% 45% 36%	552
	21st to end	Night	5% 2 3 12% 51% 28%	624
August	1st to 10th	Night	9% 4 10% 48% 29%	567
	11th to 20th	Night	3 3 10% 47% 35%	606
	21st to end	Night	11% 1 5% 10% 47% 26%	836
September	1st to 10th	Night	12% 1 5% 13% 43% 26%	760
	11th to 20th	Night	14% 2 6% 19% 43% 15%	760
	21st to end	Night	13% 1 7% 19% 42% 17%	760
October	1st to 10th	Night	16% 3 11% 28% 34% 9%	760
	11th to 20th	Night	8% 4 13% 33% 37% 7%	760
	21st to end	Night	11% 3 14% 29% 37% 5%	836
November	1st to 10th	Night	12% 4 18% 30% 30% 5%	743
	11th to 20th	Night	14% 5% 20% 35% 23% 3	760
	21st to end	Night	11% 6% 23% 38% 20% 3	760
December	1st to 10th	Night	11% 5% 22% 29% 27% 5%	760
	11th to 20th	Night	15% 7% 21% 30% 22% 5%	760
	21st to end	Night	16% 6% 18% 33% 25% 2	836

Page generated at 2024-10-29 11:20:47. Version ac07

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