Frisco Commons Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Frisco Commons Park clear sky chart from 2005-11-06 to 2024-08-15.

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	11% 5% 2 5% 4 4 4 3 5% 7% 51%	95391
	Night	11% 5% 2 4 3 3 3 3 4 6% 56%	93390
Transparency	Day	33% 5% 10% 24% 22% 6%	95167
	Night	30% 4 9% 23% 24% 10%	93220
Seeing	Day	11% 6% 20% 28% 25% 11%	14917
	Night	12% 6% 27% 36% 18% 2	24752

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	12% 5% 2 5% 3 2 3 2 4 6% 55%	2847
	11th to 20th	Day	11% 5% 1 3 2 2 2 2 4 5% 63%	2850
	21st to end	Day	20% 9% 3 6% 3 2 2 2 3 4 47%	3135
February	1st to 10th	Day	17% 7% 3 6% 3 3 3 2 4 5% 47%	1812
	11th to 20th	Day	17% 6% 2 5% 3 3 3 3 4 5% 48%	1849
	21st to end	Day	20% 7% 2 4 3 2 2 2 3 3 52%	1594
March	1st to 10th	Day	15% 6% 2 4 3 3 3 3 5% 7% 50%	3436
	11th to 20th	Day	16% 6% 2 5% 4 4 4 4 5% 6% 43%	3480
	21st to end	Day	13% 8% 2 6% 4 4 4 4 6% 6% 43%	3814
April	1st to 10th	Day	11% 6% 3 5% 3 4 4 3 5% 5% 50%	2090
	11th to 20th	Day	12% 6% 2 7% 4 4 4 3 5% 6% 46%	2168
	21st to end	Day	13% 4 2 5% 4 5% 4 3 5% 6% 48%	2422
May	1st to 10th	Day	16% 6% 3 7% 5% 4 4 3 5% 6% 41%	4082
	11th to 20th	Day	14% 6% 2 5% 3 4 3 3 5% 7% 47%	4082
	21st to end	Day	15% 6% 2 7% 5% 5% 6% 4 6% 7% 37%	4477
June	1st to 10th	Day	6% 4 2 5% 4 4 5% 5% 6% 11% 49%	2470
	11th to 20th	Day	5% 4 2 4 4 4 4 4 6% 9% 55%	2470
	21st to end	Day	5% 3 1 3 4 3 5% 4 6% 8% 57%	2470
July	1st to 10th	Day	6% 4 2 5% 4 5% 4 4 5% 8% 55%	4120
	11th to 20th	Day	3 2 1 3 3 3 4 3 6% 9% 63%	4120
	21st to end	Day	5% 4 2 5% 5% 5% 6% 5% 7% 10% 47%	4465
August	1st to 10th	Day	3 2 1 3 3 3 3 4 6% 9% 64%	2458
	11th to 20th	Day	7% 3 2 5% 4 3 5% 4 6% 9% 52%	2355
	21st to end	Day	4 3 1 6% 4 4 5% 4 8% 10% 51%	2334
September	1st to 10th	Day	9% 4 1 5% 3 3 4 4 5% 8% 54%	1980
	11th to 20th	Day	10% 4 2 7% 4 4 5% 4 6% 7% 47%	1980
	21st to end	Day	7% 4 1 3 3 3 4 3 5% 7% 59%	1980
October	1st to 10th	Day	6% 3 1 4 3 4 4 3 4 6% 62%	1929
	11th to 20th	Day	13% 4 1 4 3 2 2 2 3 5% 62%	1800
	21st to end	Day	14% 5% 2 4 2 2 3 2 3 4 60%	1980
November	1st to 10th	Day	13% 4 2 4 3 2 3 3 4 5% 57%	1858
	11th to 20th	Day	8% 3 2 4 3 4 3 2 4 6% 61%	1768
	21st to end	Day	15% 6% 2 4 3 3 2 2 3 6% 54%	1710
December	1st to 10th	Day	15% 6% 2 5% 2 3 3 3 5% 6% 50%	1710
	11th to 20th	Day	16% 7% 2 6% 4 4 4 3 4 5% 47%	2161
	21st to end	Day	17% 7% 1 4 3 3 3 3 4 5% 49%	3135
January	1st to 10th	Night	13% 5% 2 4 3 3 3 3 3 5% 56%	4108
	11th to 20th	Night	11% 4 1 4 2 2 2 2 3 4 65%	4120
	21st to end	Night	19% 7% 3 4 3 3 2 2 3 5% 49%	4532
February	1st to 10th	Night	14% 6% 2 5% 4 3 3 3 4 5% 52%	2384
	11th to 20th	Night	15% 7% 2 4 3 3 3 3 4 5% 50%	2218
	21st to end	Night	17% 6% 2 4 3 3 2 2 3 5% 53%	1860
March	1st to 10th	Night	14% 7% 3 5% 4 4 4 4 5% 6% 45%	3419
	11th to 20th	Night	13% 6% 2 5% 4 3 4 3 5% 7% 50%	3480
	21st to end	Night	13% 6% 2 6% 3 4 4 3 5% 6% 48%	3817
April	1st to 10th	Night	9% 5% 2 5% 3 3 4 3 5% 8% 54%	2090
	11th to 20th	Night	12% 6% 2 5% 4 3 3 3 5% 6% 51%	1959
	21st to end	Night	11% 5% 1 4 4 3 3 3 6% 5% 55%	1754
May	1st to 10th	Night	17% 7% 3 6% 4 4 3 4 5% 6% 40%	2823
	11th to 20th	Night	11% 6% 2 7% 4 4 4 3 4 6% 50%	2823
	21st to end	Night	9% 6% 1 5% 3 4 5% 3 6% 9% 47%	3090
June	1st to 10th	Night	4 3 1 4 3 4 3 4 6% 10% 58%	1710
	11th to 20th	Night	3 3 1 3 3 3 4 3 5% 9% 63%	1710
	21st to end	Night	2 2 1 3 3 3 4 4 6% 9% 63%	1710
July	1st to 10th	Night	4 3 1 3 3 3 4 3 5% 10% 60%	2850
	11th to 20th	Night	3 2 1 2 2 2 2 3 4 11% 67%	2850
	21st to end	Night	3 3 2 4 4 4 4 3 6% 9% 58%	3098
August	1st to 10th	Night	2 2 1 2 2 2 3 2 5% 9% 69%	1701
	11th to 20th	Night	4 3 1 5% 3 3 3 3 5% 10% 59%	1645
	21st to end	Night	4 2 1 4 3 3 5% 4 6% 10% 59%	2016
September	1st to 10th	Night	7% 3 1 4 4 3 3 4 5% 7% 59%	1980
	11th to 20th	Night	10% 5% 2 5% 3 4 3 3 5% 7% 53%	1980
	21st to end	Night	5% 3 2 3 2 3 3 3 5% 6% 65%	1980
October	1st to 10th	Night	6% 3 1 4 3 3 3 3 4 6% 64%	2011
	11th to 20th	Night	12% 3 1 3 2 2 2 2 4 4 64%	2160
	21st to end	Night	15% 4 2 3 2 2 2 2 3 3 61%	2376
November	1st to 10th	Night	9% 4 2 4 3 3 3 2 3 4 63%	2220
	11th to 20th	Night	7% 4 2 3 3 3 3 3 5% 6% 61%	2408
	21st to end	Night	14% 5% 2 5% 4 2 3 3 4 5% 53%	2470
December	1st to 10th	Night	12% 6% 2 4 3 3 3 2 4 6% 55%	2470
	11th to 20th	Night	12% 6% 2 5% 4 4 3 3 4 5% 52%	3036
	21st to end	Night	15% 6% 2 5% 3 2 2 2 4 5% 54%	4532

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	32% 3 7% 21% 32% 5%	2848
	11th to 20th	Day	26% 2 10% 23% 32% 7%	2850
	21st to end	Day	44% 2 4 19% 22% 8%	3135
February	1st to 10th	Day	43% 3 6% 20% 20% 8%	1812
	11th to 20th	Day	40% 3 7% 21% 20% 8%	1859
	21st to end	Day	39% 3 4 16% 25% 13%	1594
March	1st to 10th	Day	35% 4 7% 16% 28% 11%	3436
	11th to 20th	Day	42% 5% 10% 22% 16% 4	3480
	21st to end	Day	40% 6% 11% 20% 18% 5%	3814
April	1st to 10th	Day	35% 5% 9% 22% 19% 10%	2090
	11th to 20th	Day	38% 5% 9% 19% 20% 9%	2168
	21st to end	Day	35% 6% 9% 22% 24% 4	2422
May	1st to 10th	Day	44% 5% 10% 20% 15% 6%	4120
	11th to 20th	Day	37% 6% 10% 25% 22% 2	4086
	21st to end	Day	44% 8% 13% 20% 11% 6%	4489
June	1st to 10th	Day	28% 8% 15% 28% 17% 3	2470
	11th to 20th	Day	26% 6% 14% 29% 20% 5%	2470
	21st to end	Day	23% 7% 13% 30% 24% 4	2470
July	1st to 10th	Day	27% 5% 14% 39% 14% 1	4056
	11th to 20th	Day	18% 4 10% 42% 23% 3	4051
	21st to end	Day	30% 6% 13% 35% 16%	4325
August	1st to 10th	Day	17% 6% 15% 33% 26% 3	2444
	11th to 20th	Day	27% 7% 15% 29% 19% 3	2355
	21st to end	Day	25% 7% 14% 32% 18% 4	2334
September	1st to 10th	Day	27% 6% 11% 23% 23% 10%	1980
	11th to 20th	Day	34% 7% 11% 18% 21% 8%	1980
	21st to end	Day	23% 6% 9% 22% 28% 12%	1980
October	1st to 10th	Day	24% 5% 10% 24% 21% 17%	1929
	11th to 20th	Day	26% 4 7% 17% 29% 17%	1800
	21st to end	Day	30% 3 7% 18% 26% 15%	1980
November	1st to 10th	Day	29% 4 7% 23% 27% 10%	1858
	11th to 20th	Day	26% 3 9% 21% 30% 11%	1768
	21st to end	Day	34% 2 6% 21% 27% 10%	1710
December	1st to 10th	Day	36% 4 7% 22% 24% 6%	1710
	11th to 20th	Day	41% 3 6% 15% 26% 9%	2159
	21st to end	Day	37% 4 5% 24% 23% 7%	3135
January	1st to 10th	Night	30% 4 6% 20% 31% 9%	4108
	11th to 20th	Night	26% 3 9% 20% 31% 11%	4120
	21st to end	Night	40% 3 5% 17% 26% 9%	4532
February	1st to 10th	Night	36% 4 8% 18% 22% 11%	2384
	11th to 20th	Night	37% 3 8% 18% 25% 10%	2218
	21st to end	Night	36% 3 7% 15% 22% 16%	1860
March	1st to 10th	Night	40% 5% 7% 14% 23% 12%	3419
	11th to 20th	Night	35% 5% 11% 22% 20% 7%	3480
	21st to end	Night	36% 5% 9% 19% 26% 5%	3817
April	1st to 10th	Night	29% 6% 11% 22% 19% 14%	2090
	11th to 20th	Night	34% 5% 9% 20% 18% 14%	1959
	21st to end	Night	30% 5% 11% 22% 27% 5%	1754
May	1st to 10th	Night	45% 6% 10% 18% 14% 7%	2850
	11th to 20th	Night	35% 6% 12% 21% 24% 2	2824
	21st to end	Night	32% 8% 15% 25% 14% 6%	3099
June	1st to 10th	Night	21% 7% 16% 31% 20% 5%	1710
	11th to 20th	Night	18% 6% 13% 33% 23% 8%	1710
	21st to end	Night	17% 7% 13% 32% 26% 6%	1710
July	1st to 10th	Night	21% 4 15% 41% 17% 2	2805
	11th to 20th	Night	14% 3 10% 42% 27% 4	2796
	21st to end	Night	23% 5% 14% 37% 20% 1	2999
August	1st to 10th	Night	11% 4 11% 36% 32% 5%	1691
	11th to 20th	Night	21% 5% 13% 31% 23% 6%	1645
	21st to end	Night	19% 6% 12% 33% 24% 5%	2016
September	1st to 10th	Night	25% 6% 10% 23% 26% 10%	1980
	11th to 20th	Night	30% 6% 11% 19% 22% 12%	1980
	21st to end	Night	20% 4 8% 23% 28% 17%	1980
October	1st to 10th	Night	22% 4 10% 24% 22% 18%	2011
	11th to 20th	Night	26% 2 8% 16% 27% 21%	2160
	21st to end	Night	30% 2 5% 16% 27% 19%	2376
November	1st to 10th	Night	28% 3 7% 21% 26% 15%	2220
	11th to 20th	Night	25% 4 8% 21% 28% 14%	2408
	21st to end	Night	34% 3 7% 16% 29% 11%	2470
December	1st to 10th	Night	32% 3 8% 21% 24% 11%	2470
	11th to 20th	Night	36% 2 6% 16% 27% 11%	3037
	21st to end	Night	34% 3 6% 19% 26% 11%	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	17% 9% 32% 31% 10%	270
	11th to 20th	Day	17% 12% 37% 23% 9% 2	270
	21st to end	Day	16% 10% 37% 25% 11% 1	297
February	1st to 10th	Day	19% 10% 39% 25% 7%	270
	11th to 20th	Day	20% 13% 40% 20% 6% 1	270
	21st to end	Day	28% 11% 38% 20% 4	225
March	1st to 10th	Day	18% 14% 33% 26% 8%	270
	11th to 20th	Day	17% 17% 36% 23% 5% 2	270
	21st to end	Day	13% 12% 42% 23% 9% 1	297
April	1st to 10th	Day	13% 12% 39% 29% 6% 2	270
	11th to 20th	Day	14% 13% 36% 29% 8%	366
	21st to end	Day	16% 9% 38% 26% 9% 2	602
May	1st to 10th	Day	12% 9% 31% 35% 12% 1	653
	11th to 20th	Day	16% 4 27% 32% 16% 4	675
	21st to end	Day	14% 5% 22% 34% 20% 5%	734
June	1st to 10th	Day	7% 3 10% 33% 36% 11%	680
	11th to 20th	Day	5% 2 14% 37% 31% 11%	680
	21st to end	Day	3 1 10% 34% 36% 16%	680
July	1st to 10th	Day	6% 2 5% 28% 38% 21%	671
	11th to 20th	Day	3 1 4 27% 44% 21%	668
	21st to end	Day	4 1 4 22% 46% 24%	739
August	1st to 10th	Day	3 1 3 21% 49% 22%	676
	11th to 20th	Day	8% 1 4 26% 42% 19%	637
	21st to end	Day	4 2 2 22% 36% 35%	453
September	1st to 10th	Day	4 3 13% 36% 43%	270
	11th to 20th	Day	4 1 4 21% 39% 31%	270
	21st to end	Day	9% 2 6% 21% 37% 25%	270
October	1st to 10th	Day	3 1 13% 29% 38% 17%	270
	11th to 20th	Day	12% 4 24% 30% 24% 6%	270
	21st to end	Day	22% 11% 19% 24% 19% 5%	297
November	1st to 10th	Day	17% 4 31% 26% 15% 7%	270
	11th to 20th	Day	11% 6% 28% 32% 17% 5%	270
	21st to end	Day	16% 12% 34% 23% 12% 3	270
December	1st to 10th	Day	18% 9% 28% 29% 13% 3	270
	11th to 20th	Day	19% 7% 33% 29% 11% 1	270
	21st to end	Day	20% 9% 35% 26% 9%	297
January	1st to 10th	Night	12% 9% 37% 33% 8% 1	950
	11th to 20th	Night	16% 12% 33% 33% 6% 1	950
	21st to end	Night	15% 8% 36% 35% 6%	1045
February	1st to 10th	Night	16% 10% 38% 30% 5%	864
	11th to 20th	Night	17% 11% 39% 29% 3	744
	21st to end	Night	22% 11% 42% 23% 2	604
March	1st to 10th	Night	18% 11% 36% 30% 6%	570
	11th to 20th	Night	16% 8% 39% 31% 5%	570
	21st to end	Night	12% 12% 39% 32% 5%	627
April	1st to 10th	Night	10% 9% 43% 31% 6%	570
	11th to 20th	Night	14% 8% 42% 29% 6%	563
	21st to end	Night	12% 8% 42% 29% 9% 1	570
May	1st to 10th	Night	11% 8% 36% 37% 7% 1	570
	11th to 20th	Night	9% 3 33% 39% 14% 2	561
	21st to end	Night	8% 4 28% 42% 16% 1	617
June	1st to 10th	Night	5% 2 14% 47% 29% 4	570
	11th to 20th	Night	3 1 20% 54% 20% 2	570
	21st to end	Night	3 1 13% 44% 35% 5%	570
July	1st to 10th	Night	5% 1 6% 42% 41% 6%	555
	11th to 20th	Night	3 5% 39% 47% 4	552
	21st to end	Night	2 1 3 40% 48% 5%	624
August	1st to 10th	Night	2 1 2 41% 50% 5%	567
	11th to 20th	Night	5% 1 5% 36% 47% 6%	549
	21st to end	Night	4 1 3 39% 47% 7%	594
September	1st to 10th	Night	9% 1 6% 34% 44% 5%	540
	11th to 20th	Night	13% 1 6% 36% 40% 3	540
	21st to end	Night	6% 13% 42% 34% 4	540
October	1st to 10th	Night	7% 20% 42% 28% 2	571
	11th to 20th	Night	14% 5% 23% 39% 18% 2	720
	21st to end	Night	17% 8% 26% 33% 16%	792
November	1st to 10th	Night	10% 3 29% 40% 18% 1	740
	11th to 20th	Night	8% 8% 30% 39% 14%	888
	21st to end	Night	17% 9% 33% 31% 10% 1	950
December	1st to 10th	Night	15% 8% 34% 37% 7%	950
	11th to 20th	Night	19% 7% 33% 36% 5%	950
	21st to end	Night	17% 9% 36% 33% 6%	1045

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