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 2024-11-11.

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	9% 70% 5% 8% 5% 3	104789
	Night	10% 70% 5% 7% 5% 3	102608
Seeing	Day	9% 3 12% 32% 29% 15%	14338
	Night	12% 3 25% 44% 16% 1	24349

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	13% 59% 3 6% 10% 9%	2848
	11th to 20th	Day	10% 58% 1 10% 14% 6%	3141
	21st to end	Day	21% 59% 3 6% 9% 1	3487
February	1st to 10th	Day	1 95% 1 1 2	1900
	11th to 20th	Day	2 95% 1 1	1859
	21st to end	Day	1 94% 2 2	1570
March	1st to 10th	Day	17% 62% 5% 9% 5% 1	3342
	11th to 20th	Day	29% 59% 3 4 4 1	3480
	21st to end	Day	4 58% 5% 12% 9% 11%	3814
April	1st to 10th	Day	1 95% 1 1 2	2090
	11th to 20th	Day	2 95% 1 1 1	2071
	21st to end	Day	3 96% 1 1	2280
May	1st to 10th	Day	15% 62% 10% 10% 1 2	4051
	11th to 20th	Day	11% 62% 10% 8% 4 5%	4086
	21st to end	Day	5% 58% 5% 29% 3	4489
June	1st to 10th	Day	1 95% 1 3 1	2470
	11th to 20th	Day	1 95% 3 1	2470
	21st to end	Day	2 94% 1 2 2	2470
July	1st to 10th	Day	8% 56% 10% 23% 3	4056
	11th to 20th	Day	23% 57% 13% 5% 2 1	4051
	21st to end	Day	18% 57% 12% 11% 2	4062
August	1st to 10th	Day	1 54% 4 25% 16%	3772
	11th to 20th	Day	9% 57% 16% 17% 1	3762
	21st to end	Day	6% 57% 11% 15% 10% 1	4024
September	1st to 10th	Day	3 90% 1 1 3 2	2090
	11th to 20th	Day	2 90% 1 4 3	2090
	21st to end	Day	90% 1 5% 2 2	2090
October	1st to 10th	Day	8% 54% 1 1 14% 22%	3480
	11th to 20th	Day	11% 56% 3 6% 8% 16%	3458
	21st to end	Day	6% 56% 3 8% 22% 5%	3435
November	1st to 10th	Day	3 90% 1 3 2 1	1958
	11th to 20th	Day	3 95% 1 1	1829
	21st to end	Day	4 95% 1	1710
December	1st to 10th	Day	3 95% 1 1	1710
	11th to 20th	Day	7% 77% 4 1 5% 5%	2159
	21st to end	Day	17% 60% 2 10% 10% 1	3135
January	1st to 10th	Night	14% 58% 3 6% 8% 11%	4108
	11th to 20th	Night	7% 58% 2 10% 14% 9%	3858
	21st to end	Night	23% 59% 3 6% 7% 2	4180
February	1st to 10th	Night	2 95% 1 1	2280
	11th to 20th	Night	3 95% 1 1	2218
	21st to end	Night	1 95% 2 2	1884
March	1st to 10th	Night	17% 62% 5% 11% 4 1	3514
	11th to 20th	Night	30% 62% 4 3 2	3480
	21st to end	Night	5% 58% 3 13% 12% 8%	3817
April	1st to 10th	Night	2 95% 1 2	2090
	11th to 20th	Night	3 95% 1 1 1	2054
	21st to end	Night	3 95% 1 1	1900
May	1st to 10th	Night	12% 62% 10% 12% 3 1	2915
	11th to 20th	Night	13% 61% 9% 9% 5% 3	2824
	21st to end	Night	14% 59% 6% 20% 2	3099
June	1st to 10th	Night	1 95% 1 2 1	1710
	11th to 20th	Night	1 95% 4	1710
	21st to end	Night	1 94% 1 2 2	1710
July	1st to 10th	Night	8% 56% 14% 21% 1	2805
	11th to 20th	Night	28% 56% 11% 3 2	2796
	21st to end	Night	20% 57% 12% 11% 1	3243
August	1st to 10th	Night	54% 7% 29% 9%	3144
	11th to 20th	Night	11% 57% 21% 11% 1	3143
	21st to end	Night	5% 56% 13% 19% 5%	3635
September	1st to 10th	Night	3 90% 1 1 4 1	2090
	11th to 20th	Night	3 90% 2 4 2	2090
	21st to end	Night	2 90% 1 4 2 1	2090
October	1st to 10th	Night	9% 54% 2 2 9% 23%	3480
	11th to 20th	Night	10% 55% 3 4 14% 13%	3460
	21st to end	Night	9% 56% 3 9% 18% 5%	4079
November	1st to 10th	Night	4 90% 1 3 1 1	2340
	11th to 20th	Night	3 95% 1 1	2353
	21st to end	Night	4 95%	2470
December	1st to 10th	Night	3 95% 1 1	2470
	11th to 20th	Night	7% 78% 2 5% 3 5%	3037
	21st to end	Night	18% 61% 4 5% 6% 5%	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	15% 6% 16% 37% 22% 3	270
	21st to end	Day	21% 6% 19% 34% 19% 2	297
February	1st to 10th	Day	18% 4 25% 28% 20% 6%	270
	11th to 20th	Day	20% 5% 21% 33% 18% 3	270
	21st to end	Day	12% 6% 17% 47% 16% 2	225
March	1st to 10th	Day	17% 6% 17% 42% 15% 3	270
	11th to 20th	Day	19% 4 18% 40% 18% 1	270
	21st to end	Day	9% 3 25% 45% 19%	297
April	1st to 10th	Day	14% 4 16% 47% 18%	270
	11th to 20th	Day	10% 5% 20% 36% 25% 4	269
	21st to end	Day	8% 6% 28% 40% 15% 3	460
May	1st to 10th	Day	8% 4 25% 41% 19% 4	610
	11th to 20th	Day	12% 2 23% 41% 19% 4	675
	21st to end	Day	4 1 19% 44% 26% 4	734
June	1st to 10th	Day	2 1 8% 39% 39% 11%	680
	11th to 20th	Day	4 1 7% 46% 34% 9%	680
	21st to end	Day	5% 1 7% 35% 37% 15%	680
July	1st to 10th	Day	6% 1 5% 34% 37% 17%	671
	11th to 20th	Day	2 1 3 30% 47% 16%	668
	21st to end	Day	4 1 3 29% 40% 23%	582
August	1st to 10th	Day	1 3 28% 41% 27%	487
	11th to 20th	Day	2 1 2 24% 38% 33%	477
	21st to end	Day	2 1 4 16% 32% 45%	449
September	1st to 10th	Day	8% 2 4 11% 35% 41%	300
	11th to 20th	Day	7% 1 2 7% 29% 55%	300
	21st to end	Day	6% 1 3 11% 37% 43%	300
October	1st to 10th	Day	9% 2 3 11% 37% 38%	300
	11th to 20th	Day	11% 1 3 17% 38% 29%	300
	21st to end	Day	10% 4 12% 29% 28% 18%	330
November	1st to 10th	Day	11% 4 9% 22% 41% 13%	300
	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%	792
	21st to end	Night	19% 5% 28% 38% 9%	836
February	1st to 10th	Night	16% 6% 31% 39% 7% 1	760
	11th to 20th	Night	18% 6% 37% 32% 7%	744
	21st to end	Night	15% 5% 39% 37% 5%	628
March	1st to 10th	Night	12% 6% 42% 35% 4 1	631
	11th to 20th	Night	11% 9% 45% 32% 3	570
	21st to end	Night	10% 5% 48% 34% 2	627
April	1st to 10th	Night	11% 5% 45% 36% 3	570
	11th to 20th	Night	11% 7% 45% 35% 3	563
	21st to end	Night	10% 6% 49% 29% 4	570
May	1st to 10th	Night	10% 5% 51% 32% 3	570
	11th to 20th	Night	9% 4 44% 37% 5%	561
	21st to end	Night	5% 3 42% 44% 6%	617
June	1st to 10th	Night	3 1 20% 62% 14%	570
	11th to 20th	Night	4 1 23% 64% 8%	570
	21st to end	Night	5% 1 20% 53% 20% 1	570
July	1st to 10th	Night	7% 1 13% 59% 18% 1	555
	11th to 20th	Night	2 1 13% 66% 17% 1	552
	21st to end	Night	4 1 10% 65% 19% 1	624
August	1st to 10th	Night	1 11% 63% 23% 1	567
	11th to 20th	Night	3 1 7% 65% 23% 2	564
	21st to end	Night	6% 1 6% 49% 34% 4	627
September	1st to 10th	Night	9% 1 5% 44% 34% 6%	570
	11th to 20th	Night	10% 2 4 37% 41% 6%	570
	21st to end	Night	7% 1 8% 40% 39% 5%	570
October	1st to 10th	Night	5% 1 8% 47% 36% 3	570
	11th to 20th	Night	13% 2 11% 48% 24% 3	570
	21st to end	Night	8% 3 22% 46% 19% 2	807
November	1st to 10th	Night	10% 3 17% 46% 21% 3	780
	11th to 20th	Night	17% 2 19% 37% 22% 2	829
	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 2024-11-08 05:44:45. Version ac07

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