Falcon State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Falcon State Park clear sky chart from 2005-11-06 to 2024-01-13.

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
Transparency	Day	2 94% 1 1 1 1	74521
	Night	3 92% 1 1 1 1	74766
Seeing	Day	9% 2 12% 32% 29% 15%	13221
	Night	12% 3 24% 44% 16% 1	23370

By Month

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	2 90% 1 1 2 3	1708
	11th to 20th	Day	93% 1 1 1 2	1809
	21st to end	Day	3 95% 1 1	1980
February	1st to 10th	Day	1 95% 1 2 2	1800
	11th to 20th	Day	2 94% 1 1 2	1759
	21st to end	Day	3 95% 1 1 1	1480
March	1st to 10th	Day	1 96% 2 1	1921
	11th to 20th	Day	100%	1980
	21st to end	Day	100%	2178
April	1st to 10th	Day	100%	1980
	11th to 20th	Day	100%	1960
	21st to end	Day	100%	2160
May	1st to 10th	Day	100%	2299
	11th to 20th	Day	100%	2306
	21st to end	Day	100%	2531
June	1st to 10th	Day	100%	2340
	11th to 20th	Day	100%	2340
	21st to end	Day	99% 1	2340
July	1st to 10th	Day	2 95% 1 1 1	2276
	11th to 20th	Day	94% 1 3 1	2271
	21st to end	Day	1 94% 1 2 2	2265
August	1st to 10th	Day	94% 2 3 1	2136
	11th to 20th	Day	95% 1 3 1 1	2123
	21st to end	Day	1 95% 1 2 1	2291
September	1st to 10th	Day	94% 3 2	1980
	11th to 20th	Day	1 95% 1 2 1	1980
	21st to end	Day	95% 1 3 1	1980
October	1st to 10th	Day	3 95% 1 1	1980
	11th to 20th	Day	1 95% 1 2 2	1980
	21st to end	Day	3 95% 1 1 1	1987
November	1st to 10th	Day	3 92% 1 2 1	1858
	11th to 20th	Day	4 90% 2 3 1	1829
	21st to end	Day	4 90% 1 1 3	1710
December	1st to 10th	Day	5% 90% 1 1 2 1	1710
	11th to 20th	Day	10% 74% 5% 2 5% 5%	2159
	21st to end	Day	17% 57% 2 10% 11% 2	3135
January	1st to 10th	Night	3 90% 1 2 4	2458
	11th to 20th	Night	1 93% 1 1 2 2	2228
	21st to end	Night	3 95% 1 1	2376
February	1st to 10th	Night	1 95% 1 1 2	2160
	11th to 20th	Night	2 95% 1 1 2	2098
	21st to end	Night	2 95% 2 1 1	1776
March	1st to 10th	Night	96% 2 1 1	2038
	11th to 20th	Night	100%	1980
	21st to end	Night	100%	2178
April	1st to 10th	Night	100%	1980
	11th to 20th	Night	100%	1945
	21st to end	Night	100%	1800
May	1st to 10th	Night	100%	1657
	11th to 20th	Night	100%	1594
	21st to end	Night	100%	1746
June	1st to 10th	Night	100%	1620
	11th to 20th	Night	100%	1620
	21st to end	Night	99% 1	1620
July	1st to 10th	Night	1 95% 1 1 1	1575
	11th to 20th	Night	94% 2 3	1566
	21st to end	Night	1 95% 1 3 1	1808
August	1st to 10th	Night	95% 3 2	1779
	11th to 20th	Night	95% 1 2 1	1778
	21st to end	Night	1 95% 1 2 1	2063
September	1st to 10th	Night	94% 4 1	1980
	11th to 20th	Night	1 95% 1 2 1	1980
	21st to end	Night	95% 1 3 1	1980
October	1st to 10th	Night	4 95% 1	1980
	11th to 20th	Night	2 95% 2 1	1980
	21st to end	Night	3 95% 1 1 1	2348
November	1st to 10th	Night	4 92% 1 2	2220
	11th to 20th	Night	5% 90% 2 2 1	2346
	21st to end	Night	5% 90% 1 1 4	2470
December	1st to 10th	Night	6% 90% 1 1 2	2470
	11th to 20th	Night	10% 74% 2 5% 3 5%	3037
	21st to end	Night	19% 58% 4 5% 7% 6%	4532

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	19% 6% 19% 34% 18% 5%	270
	11th to 20th	Day	16% 7% 17% 35% 22% 3	248
	21st to end	Day	21% 6% 20% 35% 17% 1	264
February	1st to 10th	Day	20% 3 23% 28% 21% 6%	240
	11th to 20th	Day	19% 5% 20% 34% 18% 3	240
	21st to end	Day	14% 6% 18% 44% 16% 2	198
March	1st to 10th	Day	18% 6% 16% 41% 15% 4	240
	11th to 20th	Day	15% 5% 20% 40% 20% 1	240
	21st to end	Day	10% 3 23% 45% 19%	264
April	1st to 10th	Day	16% 4 12% 47% 20%	240
	11th to 20th	Day	11% 6% 18% 34% 26% 4	238
	21st to end	Day	8% 6% 30% 39% 14% 3	420
May	1st to 10th	Day	7% 3 26% 41% 18% 4	562
	11th to 20th	Day	12% 2 23% 40% 18% 4	625
	21st to end	Day	5% 1 19% 45% 25% 5%	679
June	1st to 10th	Day	2 1 8% 39% 39% 11%	630
	11th to 20th	Day	3 1 6% 47% 34% 9%	630
	21st to end	Day	5% 1 7% 34% 38% 16%	630
July	1st to 10th	Day	7% 1 5% 34% 37% 17%	621
	11th to 20th	Day	2 1 3 30% 48% 16%	618
	21st to end	Day	4 1 3 28% 40% 25%	536
August	1st to 10th	Day	1 2 29% 41% 26%	447
	11th to 20th	Day	2 1 1 22% 38% 35%	437
	21st to end	Day	3 1 4 16% 31% 45%	410
September	1st to 10th	Day	8% 1 3 9% 36% 44%	270
	11th to 20th	Day	7% 1 1 6% 28% 57%	270
	21st to end	Day	6% 1 3 10% 36% 43%	270
October	1st to 10th	Day	9% 2 3 10% 36% 39%	270
	11th to 20th	Day	11% 1 3 16% 39% 30%	270
	21st to end	Day	11% 4 12% 29% 28% 16%	297
November	1st to 10th	Day	11% 4 6% 20% 44% 15%	270
	11th to 20th	Day	23% 4 7% 18% 33% 15%	270
	21st to end	Day	24% 4 16% 26% 23% 7%	270
December	1st to 10th	Day	18% 3 15% 24% 26% 14%	270
	11th to 20th	Day	19% 5% 17% 32% 20% 6%	270
	21st to end	Day	19% 3 15% 31% 24% 8%	297
January	1st to 10th	Night	19% 5% 18% 42% 15% 1	950
	11th to 20th	Night	18% 5% 23% 46% 8%	764
	21st to end	Night	19% 5% 28% 39% 9%	792
February	1st to 10th	Night	17% 5% 31% 39% 7% 1	720
	11th to 20th	Night	18% 5% 37% 33% 7%	704
	21st to end	Night	15% 5% 40% 35% 5%	592
March	1st to 10th	Night	12% 7% 42% 34% 4 1	598
	11th to 20th	Night	10% 9% 44% 34% 4	540
	21st to end	Night	11% 5% 48% 35% 3	594
April	1st to 10th	Night	11% 5% 44% 36% 3	540
	11th to 20th	Night	11% 7% 43% 35% 3	533
	21st to end	Night	10% 6% 49% 30% 5%	540
May	1st to 10th	Night	9% 5% 51% 32% 3	540
	11th to 20th	Night	9% 4 44% 37% 5%	531
	21st to end	Night	5% 3 41% 45% 6%	584
June	1st to 10th	Night	3 1 20% 62% 14%	540
	11th to 20th	Night	4 22% 66% 8%	540
	21st to end	Night	4 1 20% 53% 20% 1	540
July	1st to 10th	Night	8% 1 14% 59% 18% 1	525
	11th to 20th	Night	1 1 11% 69% 18% 1	522
	21st to end	Night	4 1 9% 66% 20% 1	591
August	1st to 10th	Night	1 10% 63% 23% 1	537
	11th to 20th	Night	3 1 7% 64% 24% 2	534
	21st to end	Night	6% 1 6% 49% 35% 4	594
September	1st to 10th	Night	9% 1 5% 45% 34% 6%	540
	11th to 20th	Night	9% 1 4 37% 42% 6%	540
	21st to end	Night	8% 1 8% 40% 38% 5%	540
October	1st to 10th	Night	4 1 9% 49% 34% 3	540
	11th to 20th	Night	13% 2 11% 46% 24% 3	540
	21st to end	Night	8% 3 21% 46% 20% 2	764
November	1st to 10th	Night	10% 3 15% 47% 22% 3	740
	11th to 20th	Night	17% 2 19% 37% 22% 2	826
	21st to end	Night	18% 4 23% 38% 16% 1	950
December	1st to 10th	Night	18% 2 19% 40% 19% 2	950
	11th to 20th	Night	24% 4 21% 35% 15% 1	950
	21st to end	Night	17% 4 22% 40% 16% 1	1045

Page generated at 2024-01-10 18:35:26. Version ac07

Copyright 2024 Attilla Danko