Weinberg-King State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Weinberg-King State Park clear sky chart from 2005-11-06 to 2024-11-05.

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	12% 8% 3 7% 5% 4 4 4 6% 7% 40%	101384
	Night	13% 9% 3 7% 4 4 4 3 5% 6% 42%	97741
Transparency	Day	41% 6% 13% 23% 15% 2	104989
	Night	41% 5% 12% 23% 17% 2	102276
Seeing	Day	15% 10% 28% 27% 16% 4	15746
	Night	16% 10% 31% 30% 12% 1	25561

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	11% 12% 6% 14% 6% 4 4 3 5% 6% 28%	2527
	11th to 20th	Day	12% 11% 4 11% 7% 6% 7% 3 6% 6% 27%	2662
	21st to end	Day	18% 19% 9% 10% 5% 3 3 2 3 4 23%	3135
February	1st to 10th	Day	15% 10% 5% 10% 6% 5% 5% 4 5% 5% 31%	1710
	11th to 20th	Day	13% 10% 3 7% 6% 6% 4 4 6% 7% 35%	1765
	21st to end	Day	15% 11% 4 9% 5% 4 3 3 4 6% 36%	1570
March	1st to 10th	Day	16% 13% 3 7% 4 3 4 2 4 5% 39%	3204
	11th to 20th	Day	10% 8% 3 5% 3 4 5% 3 6% 8% 46%	3480
	21st to end	Day	18% 11% 3 8% 5% 4 4 3 5% 6% 31%	3995
April	1st to 10th	Day	14% 10% 3 6% 4 4 4 3 6% 6% 38%	2280
	11th to 20th	Day	15% 9% 2 7% 5% 4 4 3 5% 6% 39%	2254
	21st to end	Day	19% 7% 3 8% 5% 4 4 4 5% 7% 34%	2280
May	1st to 10th	Day	14% 7% 2 7% 5% 4 5% 5% 7% 10% 33%	4039
	11th to 20th	Day	17% 7% 3 7% 5% 4 4 3 5% 7% 39%	4399
	21st to end	Day	12% 6% 2 6% 5% 4 5% 4 5% 6% 46%	4824
June	1st to 10th	Day	7% 5% 2 6% 5% 4 5% 4 7% 10% 46%	2660
	11th to 20th	Day	7% 5% 3 7% 5% 5% 5% 4 6% 6% 48%	2660
	21st to end	Day	9% 6% 2 6% 5% 4 5% 5% 7% 8% 43%	2660
July	1st to 10th	Day	12% 6% 2 6% 5% 5% 5% 5% 6% 9% 39%	4440
	11th to 20th	Day	6% 4 2 6% 4 5% 5% 4 7% 9% 48%	4440
	21st to end	Day	8% 4 2 6% 5% 5% 5% 5% 8% 11% 41%	4659
August	1st to 10th	Day	7% 4 2 5% 4 4 5% 5% 6% 10% 48%	4104
	11th to 20th	Day	12% 5% 2 6% 4 5% 4 4 6% 10% 42%	3827
	21st to end	Day	6% 4 2 6% 3 4 5% 4 6% 9% 51%	4180
September	1st to 10th	Day	12% 5% 1 5% 3 3 4 4 5% 7% 50%	2280
	11th to 20th	Day	10% 4 2 5% 3 4 4 3 5% 8% 52%	2279
	21st to end	Day	8% 5% 2 5% 4 4 4 5% 5% 8% 50%	2040
October	1st to 10th	Day	12% 4 2 6% 4 4 3 3 5% 5% 52%	1900
	11th to 20th	Day	14% 8% 3 7% 4 3 3 2 4 5% 47%	1900
	21st to end	Day	18% 8% 3 7% 3 3 4 3 4 5% 42%	2057
November	1st to 10th	Day	10% 7% 2 5% 5% 3 3 3 5% 6% 51%	1708
	11th to 20th	Day	15% 9% 4 6% 3 3 4 2 5% 6% 42%	1710
	21st to end	Day	17% 11% 3 8% 4 3 4 2 3 6% 37%	1535
December	1st to 10th	Day	13% 13% 4 7% 5% 4 4 3 6% 6% 36%	1520
	11th to 20th	Day	15% 11% 3 7% 4 4 4 3 6% 6% 37%	1918
	21st to end	Day	22% 18% 7% 12% 3 3 4 3 4 5% 20%	2783
January	1st to 10th	Night	13% 12% 7% 12% 4 4 4 3 4 5% 31%	4428
	11th to 20th	Night	13% 16% 6% 10% 5% 5% 7% 4 6% 4 25%	4307
	21st to end	Night	20% 17% 6% 11% 4 3 3 2 4 6% 23%	4532
February	1st to 10th	Night	15% 12% 4 8% 5% 5% 4 4 5% 5% 34%	2470
	11th to 20th	Night	14% 9% 4 7% 5% 4 3 3 5% 8% 39%	2301
	21st to end	Night	15% 10% 4 7% 4 3 3 3 4 4 43%	1884
March	1st to 10th	Night	18% 12% 3 5% 4 4 4 2 4 5% 39%	3679
	11th to 20th	Night	13% 8% 2 6% 3 3 3 2 4 6% 50%	3480
	21st to end	Night	20% 12% 4 8% 5% 4 4 3 5% 6% 29%	3636
April	1st to 10th	Night	13% 8% 3 7% 5% 4 4 4 5% 7% 42%	1900
	11th to 20th	Night	13% 8% 2 6% 4 4 4 4 5% 7% 44%	1875
	21st to end	Night	18% 8% 3 7% 4 4 4 4 4 5% 40%	1900
May	1st to 10th	Night	19% 8% 2 7% 5% 4 4 3 6% 8% 35%	2844
	11th to 20th	Night	14% 6% 2 5% 4 5% 4 4 5% 8% 44%	2506
	21st to end	Night	9% 6% 2 5% 4 4 4 3 6% 8% 50%	2743
June	1st to 10th	Night	7% 5% 2 4 4 4 4 3 6% 9% 52%	1520
	11th to 20th	Night	8% 5% 2 6% 5% 4 4 3 6% 9% 50%	1520
	21st to end	Night	7% 4 2 5% 5% 5% 4 6% 6% 7% 48%	1520
July	1st to 10th	Night	13% 5% 2 6% 4 5% 4 3 6% 9% 44%	2530
	11th to 20th	Night	4 3 1 4 4 4 4 4 5% 8% 58%	2530
	21st to end	Night	8% 5% 2 5% 4 4 5% 3 6% 9% 48%	2900
August	1st to 10th	Night	5% 3 1 3 3 3 4 4 6% 10% 57%	2836
	11th to 20th	Night	8% 5% 2 5% 4 4 4 3 5% 7% 53%	3003
	21st to end	Night	5% 3 2 5% 4 4 5% 4 6% 9% 54%	3476
September	1st to 10th	Night	10% 5% 2 5% 3 3 3 2 4 7% 57%	1900
	11th to 20th	Night	8% 5% 2 5% 4 3 4 4 5% 8% 54%	1900
	21st to end	Night	8% 4 2 6% 4 5% 4 4 5% 7% 51%	2118
October	1st to 10th	Night	10% 4 1 4 4 3 4 3 4 7% 56%	2280
	11th to 20th	Night	14% 4 2 5% 3 3 3 3 4 5% 53%	2280
	21st to end	Night	17% 8% 2 5% 4 4 4 4 4 5% 44%	2539
November	1st to 10th	Night	11% 6% 2 4 3 3 4 3 4 6% 54%	2470
	11th to 20th	Night	13% 7% 2 6% 5% 4 3 3 5% 6% 45%	2470
	21st to end	Night	17% 9% 3 7% 3 3 4 3 4 6% 41%	2641
December	1st to 10th	Night	14% 12% 3 7% 5% 4 4 4 5% 6% 36%	2660
	11th to 20th	Night	15% 9% 3 8% 5% 4 4 3 4 5% 40%	3279
	21st to end	Night	22% 17% 7% 11% 5% 5% 3 3 3 4 20%	4884

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	55% 6% 12% 19% 8%	2528
	11th to 20th	Day	57% 5% 14% 16% 8%	2662
	21st to end	Day	66% 4 9% 13% 7%	3135
February	1st to 10th	Day	54% 6% 13% 18% 8% 2	1710
	11th to 20th	Day	47% 6% 12% 21% 12% 1	1774
	21st to end	Day	49% 5% 11% 21% 11% 2	1570
March	1st to 10th	Day	48% 5% 11% 20% 15% 1	3204
	11th to 20th	Day	35% 7% 14% 25% 18% 1	3480
	21st to end	Day	53% 7% 15% 19% 4 1	3995
April	1st to 10th	Day	45% 6% 12% 25% 12%	2280
	11th to 20th	Day	45% 5% 10% 24% 14% 2	2254
	21st to end	Day	48% 7% 11% 19% 13% 2	2280
May	1st to 10th	Day	42% 10% 14% 20% 13% 1	4074
	11th to 20th	Day	44% 6% 12% 29% 9%	4403
	21st to end	Day	37% 8% 10% 23% 22% 1	4837
June	1st to 10th	Day	32% 8% 15% 27% 15% 3	2660
	11th to 20th	Day	34% 7% 11% 24% 21% 3	2660
	21st to end	Day	36% 9% 15% 22% 16% 3	2660
July	1st to 10th	Day	40% 7% 13% 26% 13% 2	4371
	11th to 20th	Day	30% 7% 15% 27% 19% 1	4365
	21st to end	Day	33% 9% 21% 23% 13% 1	4512
August	1st to 10th	Day	30% 7% 17% 33% 12% 1	4090
	11th to 20th	Day	37% 7% 14% 28% 13% 1	3865
	21st to end	Day	29% 7% 15% 30% 14% 5%	4179
September	1st to 10th	Day	33% 6% 10% 26% 20% 5%	2280
	11th to 20th	Day	30% 5% 11% 29% 21% 4	2279
	21st to end	Day	31% 7% 11% 28% 21% 2	2040
October	1st to 10th	Day	24% 3 6% 16% 47% 4	3160
	11th to 20th	Day	27% 2 7% 23% 35% 6%	3140
	21st to end	Day	41% 3 8% 25% 20% 2	3371
November	1st to 10th	Day	35% 4 15% 24% 19% 3	1708
	11th to 20th	Day	43% 3 11% 25% 15% 2	1710
	21st to end	Day	50% 5% 13% 22% 10%	1535
December	1st to 10th	Day	49% 5% 14% 22% 10%	1520
	11th to 20th	Day	46% 6% 10% 26% 10% 2	1915
	21st to end	Day	67% 5% 10% 13% 5%	2783
January	1st to 10th	Night	54% 6% 11% 20% 9%	4428
	11th to 20th	Night	61% 3 10% 16% 8% 1	4307
	21st to end	Night	64% 4 10% 16% 6% 1	4532
February	1st to 10th	Night	51% 5% 11% 20% 11% 2	2470
	11th to 20th	Night	45% 3 12% 25% 13% 1	2302
	21st to end	Night	45% 4 9% 24% 15% 3	1884
March	1st to 10th	Night	46% 6% 9% 23% 14% 1	3679
	11th to 20th	Night	36% 5% 9% 28% 17% 5%	3480
	21st to end	Night	55% 7% 14% 18% 5%	3636
April	1st to 10th	Night	41% 5% 12% 25% 14% 3	1900
	11th to 20th	Night	39% 6% 10% 25% 15% 4	1875
	21st to end	Night	45% 6% 10% 20% 16% 3	1900
May	1st to 10th	Night	45% 9% 14% 20% 11% 1	2874
	11th to 20th	Night	38% 8% 15% 27% 12%	2507
	21st to end	Night	30% 7% 14% 21% 24% 3	2751
June	1st to 10th	Night	28% 6% 17% 27% 18% 3	1520
	11th to 20th	Night	31% 6% 11% 25% 23% 5%	1520
	21st to end	Night	31% 10% 15% 21% 20% 3	1520
July	1st to 10th	Night	39% 5% 14% 27% 13% 2	2490
	11th to 20th	Night	22% 6% 13% 32% 24% 2	2482
	21st to end	Night	31% 7% 18% 24% 19% 1	2808
August	1st to 10th	Night	22% 7% 19% 33% 18% 1	2826
	11th to 20th	Night	31% 5% 14% 31% 18% 1	3031
	21st to end	Night	26% 7% 17% 30% 17% 4	3476
September	1st to 10th	Night	28% 4 12% 25% 25% 7%	1900
	11th to 20th	Night	28% 6% 11% 25% 25% 5%	1900
	21st to end	Night	31% 5% 11% 25% 25% 3	2118
October	1st to 10th	Night	21% 3 7% 22% 43% 4	3800
	11th to 20th	Night	25% 3 9% 21% 37% 5%	3779
	21st to end	Night	39% 4 8% 21% 24% 4	4175
November	1st to 10th	Night	32% 5% 13% 26% 20% 5%	2470
	11th to 20th	Night	40% 4 12% 23% 19% 2	2470
	21st to end	Night	45% 3 11% 25% 14% 1	2641
December	1st to 10th	Night	48% 5% 13% 22% 11% 1	2660
	11th to 20th	Night	46% 4 14% 25% 11% 1	3281
	21st to end	Night	68% 5% 8% 12% 6% 1	4884

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	20% 17% 34% 19% 9%	270
	11th to 20th	Day	25% 20% 36% 16% 2	270
	21st to end	Day	18% 23% 37% 16% 7%	297
February	1st to 10th	Day	26% 16% 35% 19% 5%	270
	11th to 20th	Day	21% 19% 32% 20% 6% 1	270
	21st to end	Day	23% 16% 41% 18% 2	225
March	1st to 10th	Day	20% 23% 39% 16% 2	270
	11th to 20th	Day	23% 18% 36% 16% 6%	270
	21st to end	Day	33% 15% 32% 15% 3 1	401
April	1st to 10th	Day	20% 15% 36% 22% 6% 1	460
	11th to 20th	Day	19% 16% 34% 19% 10% 1	452
	21st to end	Day	21% 13% 37% 21% 7% 1	460
May	1st to 10th	Day	19% 12% 34% 27% 6% 2	539
	11th to 20th	Day	18% 12% 28% 26% 14% 2	675
	21st to end	Day	15% 7% 31% 26% 15% 6%	734
June	1st to 10th	Day	8% 4 24% 35% 23% 6%	680
	11th to 20th	Day	8% 4 27% 35% 21% 5%	680
	21st to end	Day	9% 9% 29% 32% 16% 4	680
July	1st to 10th	Day	10% 4 17% 30% 25% 14%	671
	11th to 20th	Day	6% 3 24% 36% 25% 6%	668
	21st to end	Day	10% 1 18% 35% 30% 6%	739
August	1st to 10th	Day	7% 4 16% 41% 24% 8%	676
	11th to 20th	Day	9% 4 20% 27% 30% 10%	541
	21st to end	Day	7% 3 16% 31% 33% 11%	539
September	1st to 10th	Day	13% 4 16% 32% 28% 8%	490
	11th to 20th	Day	8% 2 16% 37% 27% 10%	490
	21st to end	Day	10% 9% 23% 29% 20% 9%	440
October	1st to 10th	Day	13% 11% 26% 30% 14% 6%	300
	11th to 20th	Day	15% 19% 35% 21% 9% 1	300
	21st to end	Day	28% 14% 34% 20% 4	330
November	1st to 10th	Day	11% 12% 41% 22% 11% 3	282
	11th to 20th	Day	19% 19% 27% 26% 6% 2	270
	21st to end	Day	25% 14% 32% 21% 7%	270
December	1st to 10th	Day	13% 17% 39% 22% 7% 3	270
	11th to 20th	Day	20% 16% 37% 22% 5%	270
	21st to end	Day	24% 22% 38% 14% 2	297
January	1st to 10th	Night	17% 15% 41% 21% 6%	950
	11th to 20th	Night	19% 16% 39% 21% 5%	950
	21st to end	Night	19% 15% 37% 26% 3	1045
February	1st to 10th	Night	20% 13% 40% 23% 4	950
	11th to 20th	Night	19% 14% 38% 26% 4	826
	21st to end	Night	21% 17% 38% 21% 2	628
March	1st to 10th	Night	18% 14% 42% 22% 4	732
	11th to 20th	Night	20% 11% 34% 29% 5%	570
	21st to end	Night	25% 12% 36% 22% 5% 1	627
April	1st to 10th	Night	17% 16% 37% 25% 4	570
	11th to 20th	Night	18% 11% 34% 30% 6% 1	563
	21st to end	Night	20% 10% 36% 27% 6%	570
May	1st to 10th	Night	18% 7% 38% 30% 7% 1	570
	11th to 20th	Night	16% 7% 29% 35% 12% 1	561
	21st to end	Night	12% 6% 26% 35% 19% 2	617
June	1st to 10th	Night	8% 4 24% 44% 19% 1	570
	11th to 20th	Night	10% 4 25% 43% 18% 1	570
	21st to end	Night	7% 5% 29% 37% 20% 1	570
July	1st to 10th	Night	10% 3 12% 39% 32% 4	555
	11th to 20th	Night	5% 3 17% 45% 30% 1	552
	21st to end	Night	8% 2 12% 44% 33% 1	624
August	1st to 10th	Night	6% 3 13% 47% 29% 3	567
	11th to 20th	Night	6% 2 16% 41% 31% 5%	564
	21st to end	Night	7% 1 13% 41% 37% 2	627
September	1st to 10th	Night	12% 3 16% 39% 26% 4	570
	11th to 20th	Night	9% 2 18% 36% 30% 4	570
	21st to end	Night	9% 7% 23% 34% 23% 4	741
October	1st to 10th	Night	10% 6% 28% 32% 21% 3	760
	11th to 20th	Night	17% 11% 33% 28% 11% 1	760
	21st to end	Night	20% 14% 34% 26% 6%	836
November	1st to 10th	Night	14% 11% 38% 28% 8% 1	760
	11th to 20th	Night	16% 15% 38% 25% 6%	760
	21st to end	Night	21% 13% 36% 24% 5%	931
December	1st to 10th	Night	19% 13% 39% 24% 5% 1	950
	11th to 20th	Night	22% 11% 33% 28% 6%	950
	21st to end	Night	26% 17% 33% 22% 2	1045

Page generated at 2024-11-03 01:11:09. Version ac07

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