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 2026-09-29.

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	8% 5% 2 6% 5% 5% 6% 5% 8% 11% 41%	148516
	Night	9% 6% 2 6% 5% 5% 5% 4 7% 10% 42%	142921
Transparency	Day	23% 36% 16% 14% 8% 3	152200
	Night	25% 36% 13% 14% 9% 3	147310
Seeing	Day	9% 3 12% 27% 31% 18%	18176
	Night	10% 4 15% 29% 32% 11%	28208

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	9% 5% 2 6% 3 3 3 3 6% 7% 52%	5258
	11th to 20th	Day	18% 11% 4 8% 4 4 4 3 5% 6% 34%	5280
	21st to end	Day	12% 6% 2 6% 4 4 4 3 5% 7% 48%	5780
February	1st to 10th	Day	13% 7% 2 6% 4 4 4 4 6% 6% 44%	2079
	11th to 20th	Day	11% 5% 3 5% 4 4 3 3 5% 7% 49%	2048
	21st to end	Day	11% 5% 2 5% 3 4 5% 4 6% 7% 48%	1864
March	1st to 10th	Day	10% 7% 3 8% 4 5% 5% 4 6% 9% 41%	5045
	11th to 20th	Day	6% 3 2 4 2 3 3 3 5% 8% 61%	5090
	21st to end	Day	10% 6% 2 5% 3 4 4 4 6% 8% 47%	5586
April	1st to 10th	Day	8% 5% 2 5% 4 4 5% 4 5% 8% 50%	2310
	11th to 20th	Day	8% 4 1 6% 5% 4 5% 4 7% 8% 48%	2381
	21st to end	Day	5% 3 1 4 3 4 5% 4 7% 9% 54%	2520
May	1st to 10th	Day	4 4 2 6% 4 5% 5% 5% 7% 11% 48%	7453
	11th to 20th	Day	9% 4 2 6% 4 4 5% 4 7% 9% 46%	7626
	21st to end	Day	4 3 2 5% 4 5% 7% 6% 10% 13% 40%	8391
June	1st to 10th	Day	10% 6% 3 7% 5% 5% 7% 5% 10% 11% 29%	2730
	11th to 20th	Day	4 5% 2 7% 6% 7% 9% 6% 9% 12% 33%	2730
	21st to end	Day	8% 5% 3 8% 5% 6% 7% 5% 9% 11% 32%	2730
July	1st to 10th	Day	5% 4 2 6% 5% 6% 8% 8% 12% 16% 28%	7680
	11th to 20th	Day	2 3 2 6% 5% 6% 7% 6% 11% 16% 34%	7680
	21st to end	Day	4 3 2 5% 5% 5% 6% 5% 9% 13% 43%	8340
August	1st to 10th	Day	6% 6% 3 10% 7% 7% 7% 6% 9% 12% 25%	6014
	11th to 20th	Day	3 3 2 5% 5% 6% 7% 6% 9% 15% 39%	5793
	21st to end	Day	6% 4 2 7% 6% 6% 7% 7% 9% 15% 31%	5681
September	1st to 10th	Day	8% 7% 3 10% 7% 7% 8% 7% 10% 12% 23%	2310
	11th to 20th	Day	9% 6% 3 9% 7% 6% 8% 6% 9% 10% 27%	2310
	21st to end	Day	12% 6% 3 8% 6% 6% 7% 5% 7% 9% 32%	2288
October	1st to 10th	Day	14% 6% 3 7% 5% 5% 6% 5% 6% 9% 33%	2135
	11th to 20th	Day	6% 5% 2 5% 4 5% 5% 4 7% 8% 48%	2000
	21st to end	Day	10% 3 2 6% 3 4 5% 4 6% 9% 48%	2200
November	1st to 10th	Day	9% 5% 2 6% 5% 4 6% 5% 7% 7% 43%	2057
	11th to 20th	Day	10% 6% 3 6% 4 5% 6% 4 6% 7% 42%	2100
	21st to end	Day	11% 6% 3 7% 5% 5% 5% 4 5% 8% 43%	1979
December	1st to 10th	Day	7% 4 2 5% 3 4 4 3 5% 8% 56%	3020
	11th to 20th	Day	11% 7% 3 7% 6% 5% 6% 4 7% 8% 36%	3463
	21st to end	Day	13% 7% 2 7% 5% 4 4 3 6% 7% 42%	4565
January	1st to 10th	Night	8% 5% 2 5% 3 3 3 3 4 8% 57%	7635
	11th to 20th	Night	17% 9% 3 7% 4 4 4 3 6% 7% 35%	7680
	21st to end	Night	13% 6% 2 6% 4 4 4 4 6% 8% 44%	8401
February	1st to 10th	Night	13% 6% 2 5% 5% 3 4 3 5% 6% 48%	2536
	11th to 20th	Night	11% 6% 2 5% 4 4 4 4 6% 6% 48%	2458
	21st to end	Night	10% 5% 2 5% 3 4 4 4 6% 7% 50%	1940
March	1st to 10th	Night	13% 8% 3 6% 4 3 4 4 5% 6% 43%	5028
	11th to 20th	Night	6% 4 1 4 3 3 4 3 5% 9% 56%	5090
	21st to end	Night	11% 5% 2 6% 4 4 4 4 5% 7% 48%	5588
April	1st to 10th	Night	8% 4 2 5% 4 4 4 4 6% 9% 50%	2310
	11th to 20th	Night	8% 5% 2 5% 4 4 4 4 6% 7% 51%	2185
	21st to end	Night	7% 3 2 4 3 3 4 4 7% 11% 52%	2100
May	1st to 10th	Night	5% 4 2 6% 4 4 5% 3 6% 9% 50%	5440
	11th to 20th	Night	9% 6% 2 7% 4 4 5% 4 6% 10% 41%	5234
	21st to end	Night	4 4 2 6% 5% 5% 5% 5% 8% 13% 43%	5761
June	1st to 10th	Night	9% 6% 2 6% 5% 6% 6% 5% 8% 12% 35%	1890
	11th to 20th	Night	5% 5% 2 6% 6% 5% 7% 7% 9% 12% 35%	1890
	21st to end	Night	6% 5% 2 7% 6% 5% 6% 5% 9% 12% 35%	1890
July	1st to 10th	Night	4 4 2 8% 5% 6% 7% 6% 11% 16% 30%	5278
	11th to 20th	Night	2 3 2 5% 5% 5% 7% 6% 10% 15% 41%	5277
	21st to end	Night	4 4 2 7% 6% 6% 7% 5% 8% 12% 39%	5736
August	1st to 10th	Night	6% 6% 3 10% 6% 7% 6% 6% 9% 12% 28%	4135
	11th to 20th	Night	2 2 2 5% 5% 5% 7% 6% 9% 15% 42%	4206
	21st to end	Night	6% 6% 3 8% 6% 6% 6% 6% 10% 14% 30%	5437
September	1st to 10th	Night	9% 7% 3 10% 6% 7% 7% 6% 8% 10% 26%	2310
	11th to 20th	Night	11% 8% 4 8% 7% 6% 6% 5% 9% 10% 27%	2310
	21st to end	Night	10% 6% 3 7% 5% 6% 6% 5% 7% 8% 35%	2289
October	1st to 10th	Night	13% 6% 3 8% 5% 5% 5% 5% 7% 8% 35%	2265
	11th to 20th	Night	6% 5% 2 5% 4 4 5% 4 6% 9% 50%	2400
	21st to end	Night	9% 6% 2 6% 4 3 4 4 5% 7% 49%	2640
November	1st to 10th	Night	11% 6% 2 6% 5% 5% 4 4 6% 8% 44%	2461
	11th to 20th	Night	11% 5% 2 6% 5% 5% 5% 4 6% 7% 43%	2520
	21st to end	Night	10% 6% 2 5% 5% 5% 5% 4 6% 9% 43%	2636
December	1st to 10th	Night	8% 5% 2 5% 4 4 3 3 5% 7% 55%	4380
	11th to 20th	Night	11% 8% 3 7% 5% 4 5% 3 5% 7% 41%	4952
	21st to end	Night	14% 7% 3 7% 5% 4 4 4 6% 6% 39%	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	26% 22% 12% 12% 19% 8%	5259
	11th to 20th	Day	46% 21% 5% 9% 10% 9%	5280
	21st to end	Day	28% 24% 9% 21% 12% 7%	5780
February	1st to 10th	Day	15% 60% 5% 6% 9% 4	2079
	11th to 20th	Day	13% 58% 6% 11% 10% 3	2058
	21st to end	Day	15% 59% 5% 7% 9% 5%	1864
March	1st to 10th	Day	33% 33% 9% 11% 13% 2	5045
	11th to 20th	Day	14% 29% 9% 16% 20% 12%	5090
	21st to end	Day	24% 30% 9% 18% 12% 6%	5586
April	1st to 10th	Day	13% 60% 6% 11% 7% 3	2310
	11th to 20th	Day	11% 60% 3 11% 12% 3	2381
	21st to end	Day	10% 59% 7% 12% 11% 1	2520
May	1st to 10th	Day	22% 28% 19% 21% 8% 2	7487
	11th to 20th	Day	25% 26% 14% 25% 9%	7630
	21st to end	Day	21% 28% 21% 23% 7% 1	8405
June	1st to 10th	Day	18% 63% 10% 7% 3	2730
	11th to 20th	Day	16% 62% 10% 9% 2	2730
	21st to end	Day	13% 62% 14% 8% 2	2730
July	1st to 10th	Day	25% 29% 36% 9%	7615
	11th to 20th	Day	20% 27% 41% 13%	7611
	21st to end	Day	20% 25% 33% 20% 2	8156
August	1st to 10th	Day	37% 33% 24% 6% 1	6001
	11th to 20th	Day	16% 30% 33% 17% 3	5832
	21st to end	Day	24% 34% 27% 14% 1	5681
September	1st to 10th	Day	22% 61% 10% 4 3	2310
	11th to 20th	Day	19% 60% 11% 8% 3	2310
	21st to end	Day	18% 58% 10% 10% 5%	2288
October	1st to 10th	Day	38% 39% 10% 8% 6%	3473
	11th to 20th	Day	16% 37% 4 14% 22% 7%	3240
	21st to end	Day	12% 38% 5% 20% 22% 3	3538
November	1st to 10th	Day	17% 55% 7% 10% 7% 3	2057
	11th to 20th	Day	19% 55% 5% 9% 9% 3	2100
	21st to end	Day	18% 55% 4 11% 8% 3	1979
December	1st to 10th	Day	17% 35% 11% 17% 15% 4	3020
	11th to 20th	Day	29% 34% 7% 10% 15% 4	3460
	21st to end	Day	34% 28% 8% 18% 10% 3	4565
January	1st to 10th	Night	21% 21% 11% 18% 23% 6%	7636
	11th to 20th	Night	41% 21% 6% 12% 13% 6%	7680
	21st to end	Night	30% 25% 9% 17% 12% 7%	8401
February	1st to 10th	Night	14% 59% 5% 8% 10% 4	2536
	11th to 20th	Night	14% 58% 4 12% 9% 2	2459
	21st to end	Night	14% 60% 6% 6% 9% 4	1940
March	1st to 10th	Night	33% 32% 8% 10% 11% 6%	5028
	11th to 20th	Night	16% 31% 10% 15% 14% 14%	5090
	21st to end	Night	26% 31% 8% 14% 15% 6%	5588
April	1st to 10th	Night	13% 61% 7% 11% 5% 3	2310
	11th to 20th	Night	12% 60% 4 11% 10% 3	2185
	21st to end	Night	11% 60% 8% 12% 8% 2	2100
May	1st to 10th	Night	25% 27% 19% 19% 8% 2	5469
	11th to 20th	Night	29% 27% 13% 22% 8%	5235
	21st to end	Night	23% 28% 20% 21% 8% 1	5771
June	1st to 10th	Night	17% 61% 12% 7% 2	1890
	11th to 20th	Night	17% 63% 10% 8% 2	1890
	21st to end	Night	16% 61% 10% 10% 2	1890
July	1st to 10th	Night	29% 29% 32% 10%	5235
	11th to 20th	Night	21% 29% 37% 13%	5226
	21st to end	Night	28% 25% 27% 18% 2	5606
August	1st to 10th	Night	38% 32% 25% 5%	4124
	11th to 20th	Night	18% 32% 29% 18% 4	4233
	21st to end	Night	29% 35% 24% 12% 1	5437
September	1st to 10th	Night	25% 58% 8% 5% 3 1	2310
	11th to 20th	Night	18% 59% 10% 10% 3	2310
	21st to end	Night	17% 58% 9% 12% 4	2289
October	1st to 10th	Night	41% 38% 7% 6% 6%	3707
	11th to 20th	Night	20% 37% 3 11% 24% 5%	3899
	21st to end	Night	14% 37% 5% 17% 24% 3	4252
November	1st to 10th	Night	17% 56% 7% 10% 7% 3	2461
	11th to 20th	Night	18% 56% 4 9% 8% 5%	2520
	21st to end	Night	18% 55% 5% 11% 8% 4	2636
December	1st to 10th	Night	19% 34% 9% 19% 9% 10%	4380
	11th to 20th	Night	27% 33% 8% 14% 11% 6%	4954
	21st to end	Night	34% 30% 9% 14% 10% 3	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	11% 5% 24% 44% 15% 1	330
	11th to 20th	Day	10% 5% 30% 38% 15% 2	330
	21st to end	Day	15% 7% 29% 42% 7%	363
February	1st to 10th	Day	14% 8% 16% 39% 20% 3	330
	11th to 20th	Day	12% 3 20% 47% 15% 3	330
	21st to end	Day	12% 4 22% 39% 19% 3	407
March	1st to 10th	Day	8% 5% 25% 38% 21% 3	540
	11th to 20th	Day	11% 4 25% 36% 20% 4	540
	21st to end	Day	10% 4 17% 41% 24% 4	594
April	1st to 10th	Day	10% 5% 21% 38% 22% 5%	540
	11th to 20th	Day	7% 5% 19% 36% 24% 9%	532
	21st to end	Day	5% 3 13% 34% 34% 11%	540
May	1st to 10th	Day	5% 2 13% 38% 34% 7%	543
	11th to 20th	Day	9% 2 9% 29% 37% 14%	567
	21st to end	Day	7% 1 5% 22% 42% 22%	617
June	1st to 10th	Day	9% 2 7% 23% 39% 20%	570
	11th to 20th	Day	4 2 5% 16% 42% 31%	570
	21st to end	Day	5% 2 3 13% 41% 37%	570
July	1st to 10th	Day	6% 1 4 6% 36% 47%	565
	11th to 20th	Day	5% 1 1 4 41% 47%	564
	21st to end	Day	6% 4 9% 39% 41%	620
August	1st to 10th	Day	6% 2 4 13% 39% 36%	566
	11th to 20th	Day	3 1 3 6% 37% 51%	559
	21st to end	Day	8% 2 4 10% 39% 37%	627
September	1st to 10th	Day	9% 3 6% 11% 39% 32%	570
	11th to 20th	Day	9% 2 6% 19% 43% 21%	570
	21st to end	Day	12% 2 7% 15% 42% 21%	562
October	1st to 10th	Day	15% 2 12% 31% 31% 8%	530
	11th to 20th	Day	7% 2 10% 32% 40% 9%	530
	21st to end	Day	9% 4 11% 35% 34% 7%	583
November	1st to 10th	Day	10% 4 14% 32% 32% 7%	535
	11th to 20th	Day	13% 5% 16% 38% 23% 5%	540
	21st to end	Day	13% 4 21% 36% 22% 5%	419
December	1st to 10th	Day	9% 4 24% 37% 22% 4	330
	11th to 20th	Day	13% 5% 20% 38% 21% 3	330
	21st to end	Day	11% 4 18% 39% 24% 5%	363
January	1st to 10th	Night	14% 8% 27% 36% 14% 2	840
	11th to 20th	Night	12% 7% 27% 35% 17% 2	840
	21st to end	Night	16% 8% 29% 35% 11% 1	924
February	1st to 10th	Night	15% 6% 23% 35% 20% 2	840
	11th to 20th	Night	13% 6% 26% 39% 15% 1	823
	21st to end	Night	12% 4 22% 44% 15% 2	692
March	1st to 10th	Night	7% 6% 24% 40% 20% 2	840
	11th to 20th	Night	9% 5% 22% 41% 19% 4	840
	21st to end	Night	9% 5% 20% 40% 24% 2	924
April	1st to 10th	Night	9% 3 23% 38% 23% 3	840
	11th to 20th	Night	9% 5% 19% 33% 31% 3	831
	21st to end	Night	6% 3 16% 39% 32% 4	840
May	1st to 10th	Night	6% 2 12% 41% 34% 5%	705
	11th to 20th	Night	9% 2 12% 29% 40% 8%	621
	21st to end	Night	7% 1 6% 26% 48% 13%	683
June	1st to 10th	Night	12% 1 6% 25% 45% 11%	630
	11th to 20th	Night	6% 2 4 18% 43% 27%	630
	21st to end	Night	6% 2 3 14% 50% 25%	630
July	1st to 10th	Night	7% 2 5% 11% 40% 35%	615
	11th to 20th	Night	5% 2 11% 46% 35%	612
	21st to end	Night	4 1 3 12% 51% 29%	690
August	1st to 10th	Night	8% 4 10% 47% 30%	627
	11th to 20th	Night	3 3 9% 47% 38%	670
	21st to end	Night	11% 1 4 11% 47% 27%	924
September	1st to 10th	Night	11% 1 6% 14% 42% 26%	840
	11th to 20th	Night	13% 2 6% 20% 43% 16%	840
	21st to end	Night	12% 1 7% 19% 43% 18%	833
October	1st to 10th	Night	15% 3 11% 28% 35% 9%	800
	11th to 20th	Night	8% 3 12% 32% 38% 7%	800
	21st to end	Night	11% 3 14% 30% 37% 5%	880
November	1st to 10th	Night	11% 4 17% 30% 32% 5%	820
	11th to 20th	Night	13% 5% 19% 36% 24% 3	840
	21st to end	Night	10% 6% 23% 37% 22% 3	840
December	1st to 10th	Night	12% 5% 23% 30% 25% 5%	840
	11th to 20th	Night	14% 7% 20% 31% 23% 5%	840
	21st to end	Night	15% 6% 19% 33% 25% 2	924

Page generated at 2026-09-26 04:18:41. Version ac07

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