Hobuck Beach
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hobuck Beach clear sky chart from 2005-11-06 to 2024-11-04.

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	25% 13% 4 8% 5% 4 4 3 5% 6% 24%	105518
	Night	29% 14% 3 8% 4 4 3 3 4 5% 24%	102111
Transparency	Day	58% 9% 13% 13% 6% 1	105264
	Night	62% 7% 11% 13% 6% 1	102011
Seeing	Day	28% 3 11% 21% 24% 12%	15641
	Night	36% 5% 13% 20% 18% 8%	23697

By Month

Percentage Cloud Cover NW (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	42% 14% 3 6% 4 3 3 3 3 4 14%	2219
	11th to 20th	Day	32% 14% 3 6% 4 3 4 3 4 6% 21%	2199
	21st to end	Day	53% 12% 3 7% 3 3 2 2 3 3 9%	2874
February	1st to 10th	Day	37% 14% 3 6% 4 4 5% 4 5% 5% 14%	1710
	11th to 20th	Day	34% 12% 3 9% 4 3 3 3 3 4 23%	1665
	21st to end	Day	27% 14% 4 8% 5% 4 4 3 5% 5% 21%	1413
March	1st to 10th	Day	25% 13% 4 11% 7% 6% 5% 4 4 5% 16%	3334
	11th to 20th	Day	24% 11% 3 8% 5% 4 3 3 4 6% 30%	3490
	21st to end	Day	29% 14% 4 9% 5% 4 4 3 4 5% 18%	3825
April	1st to 10th	Day	31% 13% 3 8% 5% 5% 4 4 4 5% 17%	2270
	11th to 20th	Day	24% 12% 4 8% 5% 4 4 4 5% 5% 24%	2414
	21st to end	Day	27% 12% 4 8% 5% 5% 4 3 4 6% 21%	2470
May	1st to 10th	Day	21% 11% 3 6% 4 4 4 3 4 4 35%	4349
	11th to 20th	Day	16% 14% 4 8% 4 4 5% 4 7% 8% 26%	4377
	21st to end	Day	27% 11% 4 9% 6% 5% 5% 3 5% 6% 20%	4998
June	1st to 10th	Day	27% 13% 3 7% 6% 5% 4 4 5% 6% 20%	2850
	11th to 20th	Day	22% 16% 4 9% 6% 5% 4 4 5% 7% 18%	2850
	21st to end	Day	20% 14% 4 9% 5% 5% 5% 4 5% 5% 23%	2850
July	1st to 10th	Day	11% 13% 3 7% 5% 3 3 3 4 7% 42%	4740
	11th to 20th	Day	10% 13% 3 8% 6% 4 4 3 5% 8% 36%	4740
	21st to end	Day	19% 18% 4 9% 5% 5% 4 3 5% 6% 22%	4963
August	1st to 10th	Day	9% 17% 5% 11% 6% 5% 4 3 6% 10% 23%	4154
	11th to 20th	Day	16% 14% 4 10% 6% 6% 6% 4 7% 7% 21%	4026
	21st to end	Day	21% 11% 3 8% 4 4 3 3 4 5% 33%	4500
September	1st to 10th	Day	16% 13% 4 7% 5% 4 4 4 5% 5% 32%	2280
	11th to 20th	Day	21% 12% 4 10% 5% 4 4 2 5% 5% 29%	2185
	21st to end	Day	23% 7% 3 7% 5% 4 4 3 5% 6% 31%	2062
October	1st to 10th	Day	20% 11% 4 10% 6% 5% 5% 3 5% 6% 24%	3180
	11th to 20th	Day	33% 10% 3 7% 4 4 4 3 3 5% 23%	3161
	21st to end	Day	26% 10% 3 8% 5% 4 4 3 5% 6% 25%	3242
November	1st to 10th	Day	39% 9% 3 7% 5% 5% 4 3 4 4 18%	1512
	11th to 20th	Day	38% 10% 3 8% 4 3 3 3 3 5% 20%	1520
	21st to end	Day	37% 11% 3 8% 4 3 4 4 4 4 18%	1520
December	1st to 10th	Day	33% 12% 3 6% 4 4 3 2 4 4 26%	1449
	11th to 20th	Day	41% 12% 3 7% 5% 5% 3 2 3 4 14%	1685
	21st to end	Day	38% 15% 5% 10% 5% 4 3 3 3 3 11%	2442
January	1st to 10th	Night	38% 15% 4 10% 5% 4 4 2 3 3 13%	4726
	11th to 20th	Night	35% 10% 3 6% 4 4 3 2 4 5% 24%	4699
	21st to end	Night	52% 14% 3 7% 3 2 2 2 2 3 10%	4787
February	1st to 10th	Night	36% 13% 3 7% 4 4 3 3 3 5% 18%	2470
	11th to 20th	Night	33% 12% 3 8% 4 4 3 2 3 4 25%	2402
	21st to end	Night	31% 14% 4 7% 4 3 3 3 4 5% 22%	2041
March	1st to 10th	Night	26% 15% 4 9% 6% 5% 5% 3 5% 4 19%	3534
	11th to 20th	Night	23% 13% 3 7% 4 4 4 3 5% 6% 28%	3489
	21st to end	Night	31% 17% 5% 10% 4 3 3 2 3 4 16%	3828
April	1st to 10th	Night	30% 14% 3 9% 5% 4 4 3 5% 5% 19%	1909
	11th to 20th	Night	26% 13% 3 8% 5% 4 5% 3 4 5% 23%	1713
	21st to end	Night	26% 12% 3 9% 5% 5% 4 3 4 7% 22%	1710
May	1st to 10th	Night	20% 10% 3 6% 4 3 3 3 4 6% 39%	2612
	11th to 20th	Night	15% 20% 3 6% 4 4 4 3 5% 5% 30%	2516
	21st to end	Night	26% 15% 4 6% 4 3 3 3 4 6% 25%	2574
June	1st to 10th	Night	25% 16% 4 8% 5% 3 4 3 5% 6% 24%	1330
	11th to 20th	Night	27% 16% 3 7% 3 4 4 2 5% 6% 23%	1330
	21st to end	Night	19% 14% 3 9% 5% 4 4 5% 5% 6% 27%	1330
July	1st to 10th	Night	13% 14% 1 3 3 2 3 3 5% 6% 46%	2220
	11th to 20th	Night	11% 19% 3 7% 4 3 2 2 4 5% 40%	2220
	21st to end	Night	19% 23% 4 7% 3 2 3 3 4 5% 28%	2587
August	1st to 10th	Night	10% 26% 5% 13% 5% 4 2 3 3 6% 22%	2781
	11th to 20th	Night	18% 23% 3 8% 4 4 3 2 4 6% 23%	2812
	21st to end	Night	20% 14% 3 6% 3 3 3 2 5% 6% 34%	3168
September	1st to 10th	Night	14% 14% 3 6% 4 4 3 3 5% 6% 37%	1900
	11th to 20th	Night	21% 12% 4 8% 4 3 3 3 4 5% 32%	1993
	21st to end	Night	24% 9% 3 6% 3 3 3 3 4 6% 35%	2118
October	1st to 10th	Night	20% 8% 4 9% 6% 6% 5% 3 6% 6% 26%	3800
	11th to 20th	Night	33% 10% 3 6% 4 3 4 2 5% 6% 23%	3777
	21st to end	Night	29% 8% 3 7% 4 4 4 3 5% 5% 28%	4315
November	1st to 10th	Night	37% 10% 3 9% 5% 4 3 2 3 5% 19%	2638
	11th to 20th	Night	37% 12% 3 7% 4 3 4 3 3 4 20%	2660
	21st to end	Night	36% 9% 3 7% 5% 4 3 3 4 5% 21%	2660
December	1st to 10th	Night	32% 14% 3 7% 4 4 4 3 4 4 23%	2728
	11th to 20th	Night	40% 14% 5% 7% 4 3 3 2 3 4 14%	3520
	21st to end	Night	40% 14% 5% 9% 5% 4 4 2 3 4 12%	5214

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	74% 7% 8% 8% 3	2219
	11th to 20th	Day	65% 7% 13% 11% 3 1	2220
	21st to end	Day	83% 4 4 6% 2	2874
February	1st to 10th	Day	71% 7% 8% 8% 5%	1710
	11th to 20th	Day	68% 4 8% 13% 6% 1	1674
	21st to end	Day	66% 6% 11% 9% 5% 2	1413
March	1st to 10th	Day	67% 8% 11% 11% 3	3334
	11th to 20th	Day	56% 6% 12% 21% 4 1	3490
	21st to end	Day	68% 10% 13% 8% 1	3825
April	1st to 10th	Day	71% 7% 11% 9% 2	2270
	11th to 20th	Day	64% 7% 9% 11% 8% 1	2414
	21st to end	Day	65% 7% 12% 12% 4 1	2470
May	1st to 10th	Day	51% 8% 16% 17% 8%	4349
	11th to 20th	Day	47% 13% 20% 16% 3	4380
	21st to end	Day	63% 13% 14% 7% 3	4999
June	1st to 10th	Day	64% 9% 14% 9% 4 1	2850
	11th to 20th	Day	65% 9% 11% 10% 4	2850
	21st to end	Day	58% 11% 15% 10% 6% 1	2850
July	1st to 10th	Day	39% 7% 11% 15% 20% 9%	4666
	11th to 20th	Day	35% 10% 16% 26% 13%	4659
	21st to end	Day	54% 11% 17% 13% 4 1	4806
August	1st to 10th	Day	40% 11% 14% 25% 9% 1	4137
	11th to 20th	Day	56% 13% 15% 9% 5% 1	4065
	21st to end	Day	50% 9% 13% 19% 8%	4499
September	1st to 10th	Day	48% 10% 13% 18% 8% 3	2280
	11th to 20th	Day	54% 10% 10% 14% 11% 1	2185
	21st to end	Day	51% 11% 15% 14% 8% 1	2062
October	1st to 10th	Day	59% 8% 15% 12% 5%	3180
	11th to 20th	Day	65% 5% 12% 14% 4	3161
	21st to end	Day	60% 7% 13% 11% 8% 1	3242
November	1st to 10th	Day	71% 6% 11% 9% 3 1	1512
	11th to 20th	Day	69% 4 9% 10% 6% 1	1520
	21st to end	Day	69% 7% 8% 11% 6%	1520
December	1st to 10th	Day	64% 5% 10% 13% 7% 1	1449
	11th to 20th	Day	73% 6% 9% 9% 3 1	1688
	21st to end	Day	76% 7% 8% 6% 2 1	2442
January	1st to 10th	Night	77% 6% 7% 6% 3 1	4726
	11th to 20th	Night	62% 6% 11% 16% 4 1	4740
	21st to end	Night	83% 3 4 7% 3 1	4787
February	1st to 10th	Night	70% 6% 8% 10% 5%	2470
	11th to 20th	Night	64% 5% 9% 12% 8% 1	2404
	21st to end	Night	66% 5% 9% 13% 5% 1	2041
March	1st to 10th	Night	64% 8% 11% 13% 5%	3534
	11th to 20th	Night	54% 9% 12% 20% 5% 1	3490
	21st to end	Night	73% 6% 10% 9% 2	3828
April	1st to 10th	Night	67% 7% 13% 9% 3	1909
	11th to 20th	Night	63% 7% 10% 12% 6% 2	1713
	21st to end	Night	63% 6% 10% 13% 6% 1	1710
May	1st to 10th	Night	45% 8% 17% 21% 8% 1	2612
	11th to 20th	Night	53% 12% 14% 14% 7%	2516
	21st to end	Night	60% 11% 13% 13% 2	2574
June	1st to 10th	Night	63% 7% 13% 11% 5% 1	1330
	11th to 20th	Night	63% 9% 12% 13% 4	1330
	21st to end	Night	55% 10% 15% 12% 6% 2	1330
July	1st to 10th	Night	40% 5% 10% 14% 19% 13%	2185
	11th to 20th	Night	44% 7% 12% 21% 14% 1	2178
	21st to end	Night	58% 8% 14% 14% 5% 1	2505
August	1st to 10th	Night	49% 11% 14% 15% 10% 1	2773
	11th to 20th	Night	59% 10% 11% 13% 5% 2	2839
	21st to end	Night	51% 7% 14% 20% 9%	3168
September	1st to 10th	Night	43% 10% 12% 21% 10% 4	1900
	11th to 20th	Night	53% 8% 12% 11% 12% 3	1993
	21st to end	Night	49% 8% 12% 18% 10% 3	2118
October	1st to 10th	Night	55% 8% 14% 17% 6% 1	3800
	11th to 20th	Night	62% 5% 11% 16% 6%	3777
	21st to end	Night	58% 6% 13% 13% 9% 1	4315
November	1st to 10th	Night	69% 6% 9% 11% 4	2638
	11th to 20th	Night	69% 6% 10% 7% 6% 2	2660
	21st to end	Night	67% 5% 10% 10% 7% 1	2660
December	1st to 10th	Night	65% 7% 9% 11% 6% 1	2728
	11th to 20th	Night	75% 5% 8% 8% 3 1	3516
	21st to end	Night	77% 7% 8% 6% 3	5214

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	50% 8% 19% 13% 9% 1	180
	11th to 20th	Day	41% 9% 19% 18% 12%	180
	21st to end	Day	43% 4 12% 26% 12% 3	334
February	1st to 10th	Day	42% 7% 15% 23% 12% 1	370
	11th to 20th	Day	39% 4 14% 26% 14% 2	365
	21st to end	Day	32% 11% 15% 23% 16% 3	307
March	1st to 10th	Day	30% 6% 17% 24% 18% 5%	442
	11th to 20th	Day	32% 5% 15% 25% 17% 7%	460
	21st to end	Day	36% 5% 14% 22% 18% 5%	506
April	1st to 10th	Day	33% 4 16% 25% 15% 7%	460
	11th to 20th	Day	25% 3 14% 28% 19% 11%	452
	21st to end	Day	28% 5% 13% 27% 21% 7%	460
May	1st to 10th	Day	21% 2 11% 27% 28% 10%	463
	11th to 20th	Day	25% 1 9% 23% 26% 15%	488
	21st to end	Day	23% 3 11% 22% 27% 15%	636
June	1st to 10th	Day	29% 2 10% 20% 27% 12%	680
	11th to 20th	Day	24% 3 10% 26% 27% 11%	680
	21st to end	Day	23% 1 9% 19% 31% 16%	680
July	1st to 10th	Day	21% 1 8% 14% 34% 21%	671
	11th to 20th	Day	18% 1 6% 18% 37% 20%	668
	21st to end	Day	17% 1 7% 15% 31% 29%	639
August	1st to 10th	Day	22% 1 7% 15% 24% 30%	487
	11th to 20th	Day	17% 1 5% 15% 33% 29%	477
	21st to end	Day	23% 1 9% 18% 31% 18%	539
September	1st to 10th	Day	23% 2 8% 18% 33% 16%	490
	11th to 20th	Day	27% 1 10% 17% 27% 17%	490
	21st to end	Day	27% 2 10% 22% 28% 11%	490
October	1st to 10th	Day	27% 3 13% 21% 23% 13%	490
	11th to 20th	Day	36% 3 11% 21% 21% 7%	490
	21st to end	Day	32% 5% 18% 26% 15% 5%	463
November	1st to 10th	Day	38% 6% 10% 28% 16% 1	186
	11th to 20th	Day	39% 3 14% 26% 16% 3	180
	21st to end	Day	45% 8% 12% 17% 12% 6%	180
December	1st to 10th	Day	41% 7% 18% 19% 11% 6%	180
	11th to 20th	Day	40% 7% 21% 24% 7% 1	180
	21st to end	Day	43% 7% 17% 22% 10% 1	198
January	1st to 10th	Night	46% 10% 18% 17% 9% 1	850
	11th to 20th	Night	45% 7% 12% 23% 13%	850
	21st to end	Night	46% 5% 15% 17% 14% 2	875
February	1st to 10th	Night	43% 5% 19% 23% 9% 1	760
	11th to 20th	Night	40% 4 17% 23% 15% 1	744
	21st to end	Night	38% 9% 19% 22% 10% 2	628
March	1st to 10th	Night	34% 7% 17% 21% 16% 4	760
	11th to 20th	Night	40% 6% 15% 19% 16% 4	760
	21st to end	Night	38% 6% 15% 19% 18% 4	836
April	1st to 10th	Night	35% 5% 13% 22% 19% 6%	760
	11th to 20th	Night	34% 4 14% 25% 18% 6%	585
	21st to end	Night	32% 5% 12% 25% 20% 6%	570
May	1st to 10th	Night	27% 2 8% 27% 26% 9%	426
	11th to 20th	Night	29% 4 8% 20% 28% 11%	374
	21st to end	Night	28% 4 11% 21% 26% 9%	411
June	1st to 10th	Night	30% 4 11% 22% 24% 9%	380
	11th to 20th	Night	33% 3 11% 21% 22% 9%	380
	21st to end	Night	26% 2 9% 17% 29% 17%	380
July	1st to 10th	Night	25% 1 11% 10% 34% 19%	370
	11th to 20th	Night	22% 2 7% 18% 30% 20%	368
	21st to end	Night	21% 2 7% 17% 27% 24%	416
August	1st to 10th	Night	32% 3 5% 11% 21% 28%	526
	11th to 20th	Night	21% 2 5% 11% 30% 31%	564
	21st to end	Night	28% 2 9% 16% 29% 16%	636
September	1st to 10th	Night	24% 1 6% 18% 30% 21%	760
	11th to 20th	Night	28% 3 8% 18% 24% 20%	760
	21st to end	Night	30% 2 12% 22% 24% 11%	760
October	1st to 10th	Night	26% 3 11% 23% 25% 12%	760
	11th to 20th	Night	36% 3 10% 20% 21% 9%	760
	21st to end	Night	36% 4 16% 23% 17% 4	836
November	1st to 10th	Night	45% 5% 16% 24% 11% 1	754
	11th to 20th	Night	43% 6% 18% 20% 11% 2	760
	21st to end	Night	41% 4 18% 21% 14% 2	760
December	1st to 10th	Night	40% 6% 17% 21% 15% 2	793
	11th to 20th	Night	47% 6% 17% 21% 8% 1	850
	21st to end	Night	48% 9% 19% 18% 6% 1	935

Page generated at 2024-11-01 19:47:39. Version ac07

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