Woodpecker Lodge Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Woodpecker Lodge Observatory clear sky chart from 2005-11-06 to 2024-12-24.

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	19% 10% 3 7% 5% 4 4 3 5% 6% 33%	102077
	Night	19% 10% 3 7% 5% 4 4 3 5% 6% 34%	98131
Transparency	Day	50% 7% 12% 20% 10% 1	105588
	Night	50% 6% 13% 20% 10% 1	102710
Seeing	Day	27% 17% 31% 18% 6% 1	16615
	Night	25% 15% 33% 21% 6%	24406

By Month

Percentage Cloud Cover NE (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	15% 12% 5% 9% 5% 4 4 3 5% 5% 34%	2207
	11th to 20th	Day	13% 14% 4 8% 8% 5% 4 3 4 4 32%	2334
	21st to end	Day	9% 9% 3 8% 5% 5% 4 4 5% 7% 40%	2996
February	1st to 10th	Day	13% 14% 4 8% 5% 4 5% 5% 5% 5% 32%	1710
	11th to 20th	Day	15% 13% 4 7% 6% 5% 5% 4 5% 7% 29%	1663
	21st to end	Day	12% 13% 4 8% 6% 5% 5% 3 5% 5% 35%	1475
March	1st to 10th	Day	20% 15% 4 7% 4 5% 4 3 4 5% 30%	3324
	11th to 20th	Day	18% 17% 5% 12% 6% 5% 4 3 4 4 23%	3480
	21st to end	Day	29% 13% 3 7% 4 4 3 2 4 6% 25%	3816
April	1st to 10th	Day	22% 14% 5% 7% 5% 3 3 3 5% 6% 27%	2237
	11th to 20th	Day	22% 10% 3 7% 4 4 4 3 4 5% 35%	2442
	21st to end	Day	27% 10% 3 6% 4 4 3 2 4 5% 31%	2470
May	1st to 10th	Day	22% 15% 4 7% 5% 4 4 4 4 5% 27%	4156
	11th to 20th	Day	20% 9% 3 8% 5% 4 4 3 5% 6% 32%	4398
	21st to end	Day	20% 8% 3 7% 6% 5% 5% 4 6% 8% 29%	5013
June	1st to 10th	Day	28% 9% 3 7% 5% 4 4 3 5% 6% 27%	2850
	11th to 20th	Day	21% 7% 3 5% 4 5% 5% 4 5% 7% 33%	2850
	21st to end	Day	29% 8% 2 6% 5% 4 4 3 5% 6% 27%	2850
July	1st to 10th	Day	16% 7% 3 8% 6% 5% 6% 4 7% 9% 31%	4760
	11th to 20th	Day	17% 6% 2 7% 5% 5% 5% 4 7% 7% 36%	4760
	21st to end	Day	15% 7% 2 7% 5% 5% 5% 4 6% 8% 37%	4760
August	1st to 10th	Day	19% 7% 2 7% 5% 5% 6% 4 6% 7% 33%	4105
	11th to 20th	Day	15% 6% 3 8% 5% 5% 6% 4 6% 8% 33%	4045
	21st to end	Day	17% 5% 2 5% 4 4 4 3 5% 8% 43%	4532
September	1st to 10th	Day	15% 5% 2 6% 5% 4 5% 4 5% 7% 40%	2280
	11th to 20th	Day	18% 6% 2 6% 3 3 4 3 4 5% 45%	2107
	21st to end	Day	21% 6% 2 6% 4 4 4 3 5% 7% 40%	2090
October	1st to 10th	Day	16% 8% 3 6% 5% 4 4 3 4 7% 40%	1905
	11th to 20th	Day	21% 9% 2 6% 4 4 3 3 5% 6% 38%	1900
	21st to end	Day	24% 9% 3 7% 5% 4 4 4 4 5% 32%	1981
November	1st to 10th	Day	20% 9% 3 7% 4 5% 4 3 5% 7% 33%	1626
	11th to 20th	Day	21% 10% 3 7% 5% 4 4 3 5% 6% 32%	1600
	21st to end	Day	21% 12% 3 7% 5% 4 5% 3 4 6% 31%	1600
December	1st to 10th	Day	21% 13% 4 7% 5% 4 3 3 4 5% 31%	1565
	11th to 20th	Day	19% 14% 4 10% 5% 4 4 3 4 4 29%	1738
	21st to end	Day	19% 11% 4 8% 3 3 3 2 4 4 38%	2452
January	1st to 10th	Night	11% 11% 4 8% 5% 4 4 4 6% 8% 34%	4748
	11th to 20th	Night	17% 12% 4 9% 7% 4 4 3 4 6% 30%	4631
	21st to end	Night	10% 12% 4 7% 4 4 4 4 5% 7% 38%	4659
February	1st to 10th	Night	15% 13% 4 8% 5% 4 5% 5% 5% 4 33%	2470
	11th to 20th	Night	17% 13% 5% 7% 6% 5% 5% 3 3 5% 30%	2403
	21st to end	Night	14% 14% 4 7% 6% 4 5% 4 5% 4 33%	1975
March	1st to 10th	Night	21% 14% 3 8% 5% 5% 5% 3 3 4 27%	3515
	11th to 20th	Night	23% 16% 4 8% 5% 5% 5% 3 4 5% 22%	3479
	21st to end	Night	30% 12% 3 6% 4 3 3 3 5% 5% 26%	3816
April	1st to 10th	Night	25% 13% 3 8% 4 3 3 3 4 5% 30%	1940
	11th to 20th	Night	23% 9% 3 6% 4 4 4 3 5% 5% 34%	1688
	21st to end	Night	24% 12% 3 5% 4 3 3 3 4 4 34%	1710
May	1st to 10th	Night	22% 12% 3 7% 4 4 3 4 4 6% 30%	2786
	11th to 20th	Night	19% 7% 3 7% 4 4 5% 4 6% 7% 35%	2506
	21st to end	Night	17% 7% 3 8% 5% 5% 5% 4 7% 7% 32%	2601
June	1st to 10th	Night	28% 8% 2 6% 5% 3 4 3 5% 6% 31%	1330
	11th to 20th	Night	18% 8% 2 7% 5% 4 4 5% 4 7% 37%	1330
	21st to end	Night	29% 8% 3 6% 5% 3 4 4 4 5% 29%	1330
July	1st to 10th	Night	15% 7% 2 7% 4 4 5% 5% 6% 7% 37%	2210
	11th to 20th	Night	18% 6% 2 7% 5% 5% 6% 4 5% 6% 36%	2210
	21st to end	Night	15% 7% 2 5% 4 4 4 3 5% 7% 44%	2760
August	1st to 10th	Night	17% 6% 2 8% 5% 6% 6% 5% 7% 7% 31%	2825
	11th to 20th	Night	13% 8% 3 7% 5% 5% 4 5% 6% 8% 36%	2782
	21st to end	Night	15% 4 2 6% 4 3 3 3 5% 7% 47%	3124
September	1st to 10th	Night	17% 6% 2 6% 4 3 4 3 4 6% 46%	1900
	11th to 20th	Night	17% 6% 2 5% 3 4 3 3 4 6% 48%	2070
	21st to end	Night	19% 7% 2 4 4 3 4 3 5% 5% 44%	2090
October	1st to 10th	Night	20% 6% 2 6% 3 3 4 3 4 6% 42%	2275
	11th to 20th	Night	19% 8% 3 7% 5% 4 4 3 4 6% 39%	2280
	21st to end	Night	23% 9% 2 6% 4 4 3 3 4 5% 37%	2615
November	1st to 10th	Night	21% 10% 3 7% 4 4 4 3 4 5% 35%	2671
	11th to 20th	Night	21% 11% 2 7% 4 4 5% 3 6% 6% 31%	2800
	21st to end	Night	23% 11% 3 7% 5% 4 4 3 4 5% 30%	2800
December	1st to 10th	Night	23% 12% 4 7% 4 4 4 3 4 4 30%	2833
	11th to 20th	Night	24% 12% 3 8% 5% 4 4 2 5% 5% 29%	3681
	21st to end	Night	21% 11% 4 7% 4 3 3 3 5% 5% 33%	5288

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	51% 7% 12% 17% 12% 1	2208
	11th to 20th	Day	53% 6% 9% 17% 13% 1	2334
	21st to end	Day	41% 8% 15% 20% 15% 1	2996
February	1st to 10th	Day	51% 7% 10% 18% 12% 2	1710
	11th to 20th	Day	54% 6% 11% 18% 10% 1	1671
	21st to end	Day	50% 6% 9% 22% 11% 2	1475
March	1st to 10th	Day	54% 8% 11% 18% 7% 3	3328
	11th to 20th	Day	64% 6% 9% 14% 6% 1	3480
	21st to end	Day	61% 4 6% 17% 9% 2	3816
April	1st to 10th	Day	58% 4 8% 16% 11% 3	2237
	11th to 20th	Day	51% 5% 10% 20% 12% 2	2442
	21st to end	Day	56% 5% 9% 14% 12% 4	2470
May	1st to 10th	Day	58% 6% 9% 19% 8% 1	4170
	11th to 20th	Day	49% 9% 15% 20% 7% 1	4402
	21st to end	Day	48% 11% 12% 18% 11%	5013
June	1st to 10th	Day	57% 7% 11% 16% 8% 1	2850
	11th to 20th	Day	49% 7% 12% 20% 10% 2	2850
	21st to end	Day	59% 6% 11% 15% 10%	2850
July	1st to 10th	Day	48% 7% 18% 18% 10%	4685
	11th to 20th	Day	46% 6% 15% 24% 8%	4679
	21st to end	Day	45% 8% 16% 22% 8%	4607
August	1st to 10th	Day	49% 7% 15% 21% 8%	4092
	11th to 20th	Day	47% 9% 15% 23% 6%	4084
	21st to end	Day	39% 6% 14% 23% 17%	4532
September	1st to 10th	Day	41% 8% 14% 24% 13%	2280
	11th to 20th	Day	41% 5% 12% 27% 13% 1	2107
	21st to end	Day	44% 7% 11% 24% 14% 1	2090
October	1st to 10th	Day	44% 5% 16% 26% 9%	3165
	11th to 20th	Day	47% 6% 11% 27% 9%	3140
	21st to end	Day	44% 5% 15% 20% 16%	3244
November	1st to 10th	Day	51% 6% 11% 22% 9% 1	1626
	11th to 20th	Day	54% 5% 13% 15% 12% 2	1600
	21st to end	Day	55% 7% 13% 18% 7%	1600
December	1st to 10th	Day	56% 5% 14% 17% 7%	1565
	11th to 20th	Day	60% 4 10% 15% 9% 1	1738
	21st to end	Day	51% 5% 11% 19% 11% 3	2452
January	1st to 10th	Night	46% 6% 18% 21% 8% 1	4748
	11th to 20th	Night	53% 7% 11% 19% 9% 1	4631
	21st to end	Night	44% 7% 12% 23% 12% 1	4659
February	1st to 10th	Night	52% 6% 12% 16% 12% 2	2470
	11th to 20th	Night	57% 5% 9% 16% 11% 1	2406
	21st to end	Night	51% 6% 9% 18% 13% 2	1975
March	1st to 10th	Night	60% 6% 10% 16% 8% 1	3524
	11th to 20th	Night	61% 7% 10% 12% 7% 1	3480
	21st to end	Night	60% 4 6% 18% 10% 2	3816
April	1st to 10th	Night	58% 4 9% 16% 10% 4	1940
	11th to 20th	Night	50% 5% 10% 18% 14% 2	1688
	21st to end	Night	53% 5% 10% 15% 14% 3	1710
May	1st to 10th	Night	52% 8% 14% 15% 9% 1	2792
	11th to 20th	Night	45% 8% 17% 22% 7% 1	2507
	21st to end	Night	44% 14% 16% 17% 9%	2602
June	1st to 10th	Night	54% 7% 10% 19% 9% 1	1330
	11th to 20th	Night	48% 6% 11% 23% 9% 2	1330
	21st to end	Night	57% 7% 11% 18% 7% 1	1330
July	1st to 10th	Night	45% 7% 18% 19% 11%	2175
	11th to 20th	Night	47% 7% 14% 26% 6%	2168
	21st to end	Night	40% 8% 16% 26% 10%	2673
August	1st to 10th	Night	52% 9% 13% 20% 7%	2813
	11th to 20th	Night	43% 9% 19% 24% 6%	2809
	21st to end	Night	37% 6% 16% 25% 15% 1	3124
September	1st to 10th	Night	39% 7% 12% 28% 14% 1	1900
	11th to 20th	Night	39% 6% 12% 29% 14% 1	2070
	21st to end	Night	40% 6% 13% 26% 13% 1	2090
October	1st to 10th	Night	47% 5% 14% 24% 10% 1	3795
	11th to 20th	Night	44% 4 11% 30% 10%	3779
	21st to end	Night	42% 5% 18% 21% 14%	4302
November	1st to 10th	Night	51% 5% 13% 21% 9% 1	2671
	11th to 20th	Night	53% 6% 13% 17% 10% 1	2800
	21st to end	Night	56% 6% 13% 16% 9%	2800
December	1st to 10th	Night	56% 5% 12% 20% 6%	2833
	11th to 20th	Night	58% 6% 8% 18% 9%	3682
	21st to end	Night	54% 6% 11% 18% 10% 1	5288

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	29% 18% 34% 17% 1	180
	11th to 20th	Day	39% 19% 26% 12% 3 1	180
	21st to end	Day	22% 19% 33% 19% 6% 1	331
February	1st to 10th	Day	28% 19% 31% 16% 5% 1	370
	11th to 20th	Day	26% 25% 31% 12% 5% 1	366
	21st to end	Day	25% 22% 34% 17% 3	337
March	1st to 10th	Day	33% 20% 31% 13% 2 1	460
	11th to 20th	Day	29% 20% 29% 17% 5% 1	460
	21st to end	Day	33% 20% 30% 13% 3 1	506
April	1st to 10th	Day	35% 23% 27% 11% 3	460
	11th to 20th	Day	31% 22% 26% 15% 4 1	452
	21st to end	Day	35% 18% 27% 13% 6% 1	460
May	1st to 10th	Day	37% 18% 25% 15% 5% 1	487
	11th to 20th	Day	30% 15% 29% 16% 8% 1	674
	21st to end	Day	28% 19% 34% 16% 4	735
June	1st to 10th	Day	33% 16% 28% 16% 7% 1	680
	11th to 20th	Day	24% 17% 30% 21% 6% 1	680
	21st to end	Day	31% 14% 30% 20% 5%	680
July	1st to 10th	Day	22% 13% 36% 22% 7%	670
	11th to 20th	Day	16% 11% 40% 23% 8% 1	668
	21st to end	Day	18% 13% 33% 27% 8% 1	629
August	1st to 10th	Day	16% 13% 36% 27% 7% 1	486
	11th to 20th	Day	20% 10% 30% 29% 10% 1	479
	21st to end	Day	20% 12% 30% 24% 12% 3	539
September	1st to 10th	Day	18% 14% 36% 21% 9% 2	490
	11th to 20th	Day	23% 11% 34% 21% 8% 3	490
	21st to end	Day	22% 15% 34% 17% 8% 5%	490
October	1st to 10th	Day	20% 16% 27% 22% 12% 3	393
	11th to 20th	Day	28% 18% 26% 17% 8% 2	390
	21st to end	Day	31% 20% 29% 13% 5% 1	429
November	1st to 10th	Day	32% 14% 34% 15% 3 1	395
	11th to 20th	Day	32% 20% 28% 15% 5% 1	400
	21st to end	Day	33% 21% 29% 14% 3 1	400
December	1st to 10th	Day	30% 18% 28% 19% 5%	365
	11th to 20th	Day	36% 25% 30% 8% 2 1	200
	21st to end	Day	33% 20% 33% 11% 2	204
January	1st to 10th	Night	24% 18% 35% 19% 4	850
	11th to 20th	Night	26% 19% 33% 18% 4	813
	21st to end	Night	19% 20% 38% 20% 4	836
February	1st to 10th	Night	23% 20% 35% 17% 5% 1	760
	11th to 20th	Night	27% 19% 35% 16% 3	743
	21st to end	Night	24% 16% 36% 19% 4	628
March	1st to 10th	Night	26% 16% 37% 19% 2	760
	11th to 20th	Night	25% 17% 34% 19% 5% 1	760
	21st to end	Night	23% 17% 37% 18% 5%	836
April	1st to 10th	Night	31% 18% 30% 18% 3	638
	11th to 20th	Night	28% 14% 35% 18% 5%	564
	21st to end	Night	32% 17% 28% 18% 5%	570
May	1st to 10th	Night	30% 14% 30% 23% 4	570
	11th to 20th	Night	26% 12% 34% 22% 6%	562
	21st to end	Night	18% 17% 40% 21% 4	533
June	1st to 10th	Night	31% 8% 32% 24% 6%	380
	11th to 20th	Night	22% 11% 32% 27% 8%	380
	21st to end	Night	33% 6% 29% 27% 5%	380
July	1st to 10th	Night	19% 9% 43% 22% 8%	370
	11th to 20th	Night	17% 7% 34% 33% 10%	368
	21st to end	Night	19% 8% 33% 31% 9%	522
August	1st to 10th	Night	18% 6% 35% 30% 11%	568
	11th to 20th	Night	18% 6% 32% 33% 11% 1	562
	21st to end	Night	15% 8% 29% 32% 14% 1	627
September	1st to 10th	Night	18% 11% 37% 26% 8%	570
	11th to 20th	Night	21% 9% 30% 27% 11% 1	740
	21st to end	Night	23% 10% 33% 25% 9%	760
October	1st to 10th	Night	23% 11% 33% 23% 10%	760
	11th to 20th	Night	22% 12% 35% 22% 9%	760
	21st to end	Night	28% 17% 33% 18% 4	836
November	1st to 10th	Night	28% 15% 32% 19% 5%	847
	11th to 20th	Night	31% 17% 29% 16% 6% 1	900
	21st to end	Night	30% 19% 27% 20% 4 1	900
December	1st to 10th	Night	29% 15% 34% 17% 4	900
	11th to 20th	Night	28% 20% 33% 15% 4	900
	21st to end	Night	29% 20% 29% 16% 4 1	953

Page generated at 2024-12-21 05:13:52. Version ac07

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