Pompano Beach
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pompano Beach 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	6% 5% 2 7% 5% 6% 7% 6% 9% 12% 36%	147741
	Night	6% 5% 2 6% 5% 5% 6% 5% 8% 10% 41%	143661
Transparency	Day	21% 38% 17% 16% 6% 1	151394
	Night	23% 38% 16% 15% 7% 2	148080
Seeing	Day	7% 3 10% 26% 33% 21%	18673
	Night	8% 3 12% 28% 33% 15%	28767

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	6% 4 2 4 3 3 4 3 6% 11% 53%	5258
	11th to 20th	Day	14% 8% 3 9% 6% 6% 5% 5% 8% 10% 26%	5280
	21st to end	Day	10% 7% 3 8% 5% 5% 6% 4 6% 8% 38%	5798
February	1st to 10th	Day	8% 7% 2 6% 5% 4 6% 5% 7% 11% 41%	2100
	11th to 20th	Day	7% 5% 2 5% 4 4 4 4 7% 11% 48%	2191
	21st to end	Day	6% 5% 2 6% 5% 5% 6% 5% 7% 9% 44%	1903
March	1st to 10th	Day	5% 4 2 7% 5% 6% 7% 5% 8% 10% 40%	5045
	11th to 20th	Day	4 2 1 4 3 3 4 4 7% 11% 58%	5090
	21st to end	Day	7% 5% 2 6% 5% 5% 5% 5% 8% 10% 42%	5586
April	1st to 10th	Day	4 4 2 5% 4 5% 6% 6% 9% 13% 44%	2310
	11th to 20th	Day	7% 5% 2 5% 4 5% 5% 6% 8% 10% 42%	2405
	21st to end	Day	6% 3 2 5% 5% 5% 6% 7% 9% 11% 43%	2520
May	1st to 10th	Day	5% 2 1 3 3 3 4 4 7% 13% 54%	7021
	11th to 20th	Day	5% 4 2 6% 5% 5% 7% 5% 9% 13% 39%	7044
	21st to end	Day	4 4 2 5% 5% 6% 8% 7% 11% 15% 35%	8391
June	1st to 10th	Day	13% 8% 4 11% 8% 9% 7% 6% 8% 10% 17%	2730
	11th to 20th	Day	7% 6% 3 9% 7% 8% 9% 8% 9% 11% 23%	2730
	21st to end	Day	6% 6% 3 9% 7% 7% 8% 7% 10% 13% 24%	2730
July	1st to 10th	Day	5% 5% 2 8% 6% 7% 7% 6% 10% 14% 31%	7680
	11th to 20th	Day	4 4 2 7% 6% 7% 7% 7% 10% 13% 33%	7680
	21st to end	Day	2 3 1 5% 5% 6% 7% 7% 11% 17% 37%	8340
August	1st to 10th	Day	3 4 2 9% 8% 8% 8% 7% 12% 13% 24%	5857
	11th to 20th	Day	2 3 2 5% 4 6% 7% 6% 9% 14% 42%	5488
	21st to end	Day	4 3 1 6% 6% 7% 9% 8% 13% 19% 24%	5754
September	1st to 10th	Day	7% 5% 3 10% 7% 8% 9% 8% 10% 12% 20%	2310
	11th to 20th	Day	6% 6% 3 10% 8% 8% 8% 7% 10% 13% 21%	2310
	21st to end	Day	9% 8% 3 10% 8% 8% 9% 6% 9% 9% 20%	2288
October	1st to 10th	Day	9% 7% 3 9% 7% 7% 8% 7% 9% 13% 21%	2087
	11th to 20th	Day	9% 7% 3 8% 6% 6% 7% 6% 9% 12% 27%	2000
	21st to end	Day	10% 6% 3 7% 6% 5% 6% 5% 6% 10% 35%	2200
November	1st to 10th	Day	8% 6% 2 7% 5% 5% 7% 5% 9% 11% 35%	2057
	11th to 20th	Day	11% 6% 2 7% 8% 5% 6% 6% 7% 10% 31%	2100
	21st to end	Day	7% 5% 2 7% 7% 6% 7% 5% 7% 8% 39%	2100
December	1st to 10th	Day	6% 5% 2 4 4 4 4 5% 8% 9% 49%	3330
	11th to 20th	Day	8% 6% 3 7% 6% 5% 7% 5% 8% 11% 35%	3463
	21st to end	Day	12% 7% 3 8% 6% 6% 7% 5% 8% 9% 29%	4565
January	1st to 10th	Night	5% 4 2 5% 4 4 5% 4 7% 9% 50%	7635
	11th to 20th	Night	14% 8% 4 9% 6% 5% 5% 4 7% 8% 30%	7680
	21st to end	Night	10% 8% 3 8% 5% 4 4 4 5% 7% 42%	8364
February	1st to 10th	Night	8% 6% 2 4 4 4 4 4 7% 9% 46%	2520
	11th to 20th	Night	6% 4 2 5% 4 4 5% 3 6% 8% 53%	2311
	21st to end	Night	6% 3 2 5% 4 4 5% 3 7% 8% 53%	1903
March	1st to 10th	Night	4 4 3 7% 4 5% 5% 4 7% 9% 49%	5028
	11th to 20th	Night	5% 3 1 4 3 4 3 4 5% 10% 59%	5090
	21st to end	Night	6% 4 2 5% 5% 5% 5% 5% 7% 9% 48%	5588
April	1st to 10th	Night	4 3 2 4 3 4 4 5% 6% 11% 54%	2310
	11th to 20th	Night	5% 3 2 6% 4 5% 6% 4 7% 10% 48%	2162
	21st to end	Night	6% 5% 2 4 5% 3 4 4 7% 10% 49%	2100
May	1st to 10th	Night	3 3 1 4 3 4 4 4 7% 11% 56%	5833
	11th to 20th	Night	5% 4 2 6% 4 5% 5% 5% 8% 11% 44%	5830
	21st to end	Night	4 4 2 5% 4 5% 6% 7% 11% 14% 37%	5786
June	1st to 10th	Night	11% 7% 3 9% 7% 7% 7% 5% 9% 10% 24%	1890
	11th to 20th	Night	7% 5% 3 6% 6% 7% 7% 6% 9% 13% 31%	1890
	21st to end	Night	4 6% 3 8% 6% 7% 6% 7% 10% 13% 31%	1890
July	1st to 10th	Night	4 5% 2 7% 7% 6% 6% 5% 8% 12% 39%	5278
	11th to 20th	Night	3 4 2 7% 5% 5% 6% 5% 9% 13% 41%	5277
	21st to end	Night	1 3 2 5% 5% 5% 5% 5% 9% 15% 46%	5736
August	1st to 10th	Night	3 3 3 8% 7% 8% 9% 7% 9% 12% 31%	4244
	11th to 20th	Night	1 2 1 5% 5% 5% 5% 5% 8% 12% 51%	4557
	21st to end	Night	3 4 2 6% 5% 8% 9% 7% 13% 17% 26%	5350
September	1st to 10th	Night	6% 6% 3 8% 7% 6% 9% 7% 10% 11% 26%	2310
	11th to 20th	Night	8% 6% 3 8% 7% 7% 8% 6% 9% 13% 26%	2310
	21st to end	Night	8% 7% 4 10% 7% 8% 9% 6% 10% 10% 22%	2289
October	1st to 10th	Night	8% 7% 3 10% 7% 7% 7% 7% 9% 10% 24%	2310
	11th to 20th	Night	10% 6% 2 7% 6% 6% 6% 5% 7% 10% 34%	2400
	21st to end	Night	11% 6% 2 6% 5% 6% 6% 4 7% 8% 39%	2640
November	1st to 10th	Night	9% 6% 3 7% 5% 5% 5% 4 7% 9% 40%	2461
	11th to 20th	Night	9% 6% 3 8% 6% 6% 6% 6% 6% 8% 36%	2520
	21st to end	Night	8% 6% 2 7% 5% 5% 6% 4 7% 9% 41%	2520
December	1st to 10th	Night	8% 5% 2 5% 4 4 4 4 6% 8% 51%	4064
	11th to 20th	Night	11% 7% 3 8% 6% 5% 6% 4 7% 9% 33%	4952
	21st to end	Night	9% 8% 3 9% 6% 6% 6% 5% 8% 9% 28%	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	19% 24% 9% 30% 15% 4	5259
	11th to 20th	Day	41% 26% 12% 14% 5% 2	5280
	21st to end	Day	33% 26% 6% 25% 8% 2	5798
February	1st to 10th	Day	11% 61% 9% 10% 6% 3	2100
	11th to 20th	Day	10% 58% 4 14% 11% 2	2201
	21st to end	Day	13% 60% 7% 9% 9% 3	1903
March	1st to 10th	Day	24% 35% 10% 15% 14% 2	5045
	11th to 20th	Day	9% 31% 13% 23% 15% 9%	5090
	21st to end	Day	23% 32% 11% 21% 11% 2	5586
April	1st to 10th	Day	8% 61% 9% 13% 8% 1	2310
	11th to 20th	Day	10% 62% 7% 8% 10% 4	2405
	21st to end	Day	9% 61% 6% 14% 10% 1	2520
May	1st to 10th	Day	14% 26% 17% 31% 10% 2	7053
	11th to 20th	Day	21% 28% 23% 23% 5% 1	7048
	21st to end	Day	18% 30% 26% 21% 5%	8405
June	1st to 10th	Day	22% 63% 8% 5% 1	2730
	11th to 20th	Day	17% 65% 10% 7% 1	2730
	21st to end	Day	12% 65% 17% 6%	2730
July	1st to 10th	Day	26% 30% 35% 10%	7615
	11th to 20th	Day	26% 28% 33% 12%	7611
	21st to end	Day	19% 30% 31% 20% 1	8156
August	1st to 10th	Day	32% 37% 22% 8%	5844
	11th to 20th	Day	13% 34% 26% 23% 5%	5524
	21st to end	Day	21% 37% 36% 5%	5754
September	1st to 10th	Day	19% 64% 12% 5%	2310
	11th to 20th	Day	18% 60% 15% 6% 1	2310
	21st to end	Day	19% 63% 9% 7% 2	2288
October	1st to 10th	Day	29% 44% 14% 10% 2	3399
	11th to 20th	Day	30% 39% 12% 11% 7% 1	3240
	21st to end	Day	20% 38% 9% 21% 9% 3	3538
November	1st to 10th	Day	16% 58% 10% 11% 4 1	2057
	11th to 20th	Day	19% 57% 6% 9% 7% 2	2100
	21st to end	Day	16% 57% 7% 9% 8% 3	2100
December	1st to 10th	Day	15% 38% 12% 22% 10% 3	3330
	11th to 20th	Day	24% 36% 10% 14% 13% 3	3460
	21st to end	Day	36% 31% 12% 12% 9%	4565
January	1st to 10th	Night	22% 26% 10% 24% 14% 5%	7636
	11th to 20th	Night	41% 26% 15% 12% 5% 2	7680
	21st to end	Night	32% 26% 7% 24% 8% 2	8364
February	1st to 10th	Night	11% 61% 7% 12% 6% 3	2520
	11th to 20th	Night	10% 58% 4 12% 12% 4	2312
	21st to end	Night	12% 61% 5% 9% 10% 4	1903
March	1st to 10th	Night	23% 34% 9% 16% 16% 2	5028
	11th to 20th	Night	12% 32% 15% 19% 13% 8%	5090
	21st to end	Night	22% 32% 10% 19% 15% 1	5588
April	1st to 10th	Night	9% 60% 7% 15% 7% 1	2310
	11th to 20th	Night	10% 62% 6% 8% 11% 3	2162
	21st to end	Night	9% 60% 7% 14% 8% 1	2100
May	1st to 10th	Night	15% 26% 23% 27% 8% 2	5863
	11th to 20th	Night	20% 28% 20% 24% 7%	5831
	21st to end	Night	20% 31% 27% 19% 3	5796
June	1st to 10th	Night	18% 63% 11% 7% 1	1890
	11th to 20th	Night	18% 65% 10% 7% 1	1890
	21st to end	Night	13% 63% 17% 6% 1	1890
July	1st to 10th	Night	26% 28% 35% 11%	5235
	11th to 20th	Night	24% 26% 38% 12%	5226
	21st to end	Night	18% 27% 33% 21% 1	5606
August	1st to 10th	Night	32% 35% 22% 10% 1	4233
	11th to 20th	Night	15% 31% 24% 27% 3	4587
	21st to end	Night	24% 40% 33% 3	5350
September	1st to 10th	Night	22% 61% 11% 5%	2310
	11th to 20th	Night	18% 62% 14% 6% 1	2310
	21st to end	Night	20% 62% 8% 7% 3	2289
October	1st to 10th	Night	34% 43% 12% 10% 1	3778
	11th to 20th	Night	32% 40% 10% 10% 8%	3899
	21st to end	Night	21% 39% 9% 20% 9% 3	4252
November	1st to 10th	Night	17% 57% 9% 11% 5% 1	2461
	11th to 20th	Night	20% 57% 5% 10% 6% 2	2520
	21st to end	Night	18% 57% 6% 9% 8% 3	2520
December	1st to 10th	Night	19% 38% 10% 21% 12% 1	4064
	11th to 20th	Night	28% 36% 8% 13% 10% 4	4954
	21st to end	Night	37% 32% 11% 11% 7% 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% 5% 18% 40% 27% 2	330
	11th to 20th	Day	15% 6% 20% 34% 21% 4	330
	21st to end	Day	10% 7% 26% 41% 15% 1	363
February	1st to 10th	Day	5% 5% 18% 36% 31% 5%	330
	11th to 20th	Day	6% 4 17% 39% 28% 6%	474
	21st to end	Day	5% 4 18% 35% 33% 4	446
March	1st to 10th	Day	4 4 21% 44% 24% 3	540
	11th to 20th	Day	6% 6% 17% 39% 29% 3	540
	21st to end	Day	5% 3 16% 40% 30% 6%	594
April	1st to 10th	Day	2 3 14% 52% 25% 4	540
	11th to 20th	Day	6% 2 17% 41% 30% 5%	532
	21st to end	Day	5% 2 9% 35% 43% 5%	540
May	1st to 10th	Day	3 2 9% 31% 45% 10%	543
	11th to 20th	Day	9% 2 11% 30% 37% 12%	567
	21st to end	Day	8% 2 5% 19% 40% 25%	617
June	1st to 10th	Day	12% 3 4 19% 39% 24%	570
	11th to 20th	Day	6% 2 5% 13% 36% 37%	570
	21st to end	Day	3 1 2 9% 33% 52%	570
July	1st to 10th	Day	5% 1 2 6% 29% 56%	565
	11th to 20th	Day	5% 2 3 10% 32% 49%	564
	21st to end	Day	3 2 13% 34% 48%	620
August	1st to 10th	Day	5% 2 4 9% 33% 46%	566
	11th to 20th	Day	3 1 2 8% 34% 52%	559
	21st to end	Day	7% 2 2 11% 38% 40%	627
September	1st to 10th	Day	8% 3 2 7% 33% 47%	570
	11th to 20th	Day	5% 2 5% 12% 33% 44%	570
	21st to end	Day	7% 3 8% 15% 33% 33%	562
October	1st to 10th	Day	9% 4 6% 21% 44% 15%	530
	11th to 20th	Day	10% 5% 8% 27% 34% 15%	530
	21st to end	Day	10% 3 15% 24% 37% 11%	583
November	1st to 10th	Day	7% 6% 11% 32% 35% 9%	535
	11th to 20th	Day	11% 4 14% 35% 31% 6%	540
	21st to end	Day	6% 4 16% 36% 34% 4	540
December	1st to 10th	Day	9% 5% 16% 32% 34% 5%	523
	11th to 20th	Day	8% 4 18% 30% 32% 7%	330
	21st to end	Day	10% 6% 18% 31% 28% 8%	363
January	1st to 10th	Night	9% 4 21% 35% 29% 3	840
	11th to 20th	Night	10% 6% 24% 35% 23% 1	840
	21st to end	Night	10% 6% 25% 40% 18% 1	924
February	1st to 10th	Night	10% 6% 17% 39% 25% 2	840
	11th to 20th	Night	7% 3 23% 37% 28% 2	823
	21st to end	Night	7% 5% 15% 45% 27% 1	692
March	1st to 10th	Night	5% 4 25% 43% 22% 2	840
	11th to 20th	Night	8% 4 17% 41% 29% 2	840
	21st to end	Night	6% 4 19% 41% 28% 2	924
April	1st to 10th	Night	5% 2 13% 48% 29% 2	840
	11th to 20th	Night	6% 2 17% 44% 29% 2	831
	21st to end	Night	7% 3 12% 42% 33% 3	840
May	1st to 10th	Night	4 2 9% 42% 40% 5%	840
	11th to 20th	Night	8% 3 11% 38% 36% 5%	829
	21st to end	Night	8% 2 5% 22% 48% 14%	695
June	1st to 10th	Night	12% 2 5% 19% 43% 19%	630
	11th to 20th	Night	7% 2 3 12% 44% 32%	630
	21st to end	Night	5% 1 3 9% 36% 47%	630
July	1st to 10th	Night	5% 1 3 7% 36% 48%	615
	11th to 20th	Night	5% 4 8% 39% 44%	612
	21st to end	Night	3 2 7% 39% 48%	690
August	1st to 10th	Night	7% 1 2 8% 41% 40%	671
	11th to 20th	Night	3 4 7% 40% 45%	830
	21st to end	Night	9% 2 3 12% 39% 35%	924
September	1st to 10th	Night	9% 3 5% 8% 32% 43%	840
	11th to 20th	Night	9% 2 5% 12% 36% 36%	840
	21st to end	Night	11% 1 7% 15% 36% 30%	833
October	1st to 10th	Night	11% 2 7% 25% 41% 14%	800
	11th to 20th	Night	11% 4 8% 25% 41% 12%	800
	21st to end	Night	14% 3 12% 30% 31% 10%	880
November	1st to 10th	Night	13% 4 16% 32% 30% 6%	820
	11th to 20th	Night	11% 4 15% 32% 33% 5%	840
	21st to end	Night	11% 3 16% 35% 32% 3	840
December	1st to 10th	Night	8% 5% 16% 34% 32% 4	840
	11th to 20th	Night	12% 5% 18% 31% 30% 4	840
	21st to end	Night	9% 5% 19% 33% 30% 4	924

Page generated at 2026-09-26 04:18:38. Version ac07

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