Pine Mountain State Resort Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pine Mountain State Resort Park clear sky chart from 2005-11-05 to 2024-10-14.

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	14% 9% 3 7% 5% 5% 5% 4 6% 7% 36%	100848
	Night	14% 9% 3 7% 4 4 4 3 5% 7% 38%	97675
Transparency	Day	45% 7% 11% 21% 14% 2	100661
	Night	44% 7% 11% 21% 15% 3	97536
Seeing	Day	21% 13% 23% 22% 15% 7%	14771
	Night	19% 10% 19% 30% 19% 3	24798

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	16% 15% 5% 13% 4 4 4 3 5% 6% 25%	2836
	11th to 20th	Day	17% 14% 7% 13% 4 7% 3 3 4 3 25%	2840
	21st to end	Day	21% 16% 7% 7% 4 4 4 2 3 5% 28%	3124
February	1st to 10th	Day	16% 12% 5% 9% 5% 4 4 3 5% 6% 31%	1840
	11th to 20th	Day	20% 11% 5% 10% 4 4 4 3 4 5% 30%	1848
	21st to end	Day	23% 12% 4 9% 4 3 3 3 3 5% 31%	1570
March	1st to 10th	Day	22% 15% 4 6% 4 3 3 3 4 6% 31%	3237
	11th to 20th	Day	14% 9% 3 6% 4 3 3 3 5% 6% 44%	3480
	21st to end	Day	16% 10% 3 7% 5% 4 4 3 5% 7% 37%	3815
April	1st to 10th	Day	13% 8% 2 8% 5% 5% 4 4 6% 7% 38%	2144
	11th to 20th	Day	16% 8% 2 6% 4 3 4 3 5% 6% 41%	2300
	21st to end	Day	16% 8% 2 7% 5% 5% 5% 4 6% 6% 38%	2470
May	1st to 10th	Day	19% 10% 3 8% 6% 5% 4 5% 6% 6% 29%	4082
	11th to 20th	Day	18% 9% 3 9% 5% 5% 4 4 6% 6% 32%	4081
	21st to end	Day	11% 6% 2 8% 6% 5% 5% 5% 7% 9% 36%	4476
June	1st to 10th	Day	11% 6% 2 6% 6% 6% 5% 5% 8% 9% 34%	2470
	11th to 20th	Day	7% 5% 2 7% 5% 6% 7% 5% 7% 10% 38%	2470
	21st to end	Day	9% 5% 2 7% 6% 5% 6% 5% 8% 10% 36%	2470
July	1st to 10th	Day	7% 5% 2 7% 6% 7% 7% 6% 7% 11% 35%	4120
	11th to 20th	Day	9% 6% 2 7% 6% 5% 5% 5% 7% 10% 36%	4120
	21st to end	Day	17% 12% 5% 11% 7% 6% 6% 5% 6% 7% 18%	4466
August	1st to 10th	Day	9% 6% 3 7% 5% 5% 6% 5% 8% 11% 36%	4104
	11th to 20th	Day	10% 5% 2 6% 5% 6% 6% 5% 8% 11% 36%	4044
	21st to end	Day	5% 3 2 5% 3 4 4 4 7% 8% 53%	4185
September	1st to 10th	Day	12% 6% 3 7% 6% 5% 6% 4 5% 7% 40%	2100
	11th to 20th	Day	14% 6% 2 5% 4 4 5% 4 6% 8% 41%	2090
	21st to end	Day	16% 7% 2 6% 3 3 3 4 6% 6% 43%	2090
October	1st to 10th	Day	10% 5% 2 6% 4 4 3 3 5% 7% 51%	2090
	11th to 20th	Day	14% 7% 1 6% 3 4 3 2 5% 6% 49%	1849
	21st to end	Day	18% 8% 3 4 3 3 4 2 4 6% 44%	1958
November	1st to 10th	Day	10% 6% 2 5% 4 3 3 3 5% 6% 51%	1672
	11th to 20th	Day	13% 9% 3 5% 4 2 4 4 5% 7% 43%	1710
	21st to end	Day	15% 11% 3 6% 3 3 4 3 4 6% 42%	1710
December	1st to 10th	Day	20% 12% 4 8% 5% 3 4 3 4 6% 31%	1710
	11th to 20th	Day	15% 15% 3 7% 5% 4 4 4 6% 7% 32%	2153
	21st to end	Day	14% 18% 4 7% 5% 4 5% 4 6% 7% 26%	3124
January	1st to 10th	Night	16% 19% 8% 10% 5% 4 3 2 3 4 26%	4109
	11th to 20th	Night	21% 13% 4 8% 6% 5% 4 2 3 4 31%	4120
	21st to end	Night	20% 15% 4 8% 4 3 4 3 4 5% 31%	4532
February	1st to 10th	Night	16% 12% 4 9% 5% 4 4 4 5% 7% 30%	2337
	11th to 20th	Night	22% 11% 5% 8% 5% 4 4 3 4 5% 30%	2218
	21st to end	Night	21% 14% 4 9% 5% 4 4 3 5% 4 27%	1884
March	1st to 10th	Night	21% 14% 3 7% 4 4 4 3 5% 6% 30%	3615
	11th to 20th	Night	12% 9% 2 5% 4 3 4 3 5% 6% 47%	3480
	21st to end	Night	12% 8% 3 6% 5% 5% 5% 4 6% 6% 39%	3817
April	1st to 10th	Night	12% 8% 3 6% 4 4 4 3 5% 7% 43%	2051
	11th to 20th	Night	12% 9% 2 6% 5% 3 4 4 6% 7% 42%	1827
	21st to end	Night	13% 8% 3 6% 5% 3 4 4 6% 7% 41%	1710
May	1st to 10th	Night	17% 8% 3 9% 5% 5% 6% 4 7% 8% 29%	2813
	11th to 20th	Night	19% 9% 2 7% 4 4 5% 4 4 7% 36%	2812
	21st to end	Night	8% 5% 2 8% 6% 5% 5% 4 7% 9% 41%	3079
June	1st to 10th	Night	8% 6% 2 6% 5% 4 6% 6% 8% 10% 39%	1710
	11th to 20th	Night	5% 4 2 5% 5% 5% 5% 5% 8% 11% 46%	1710
	21st to end	Night	8% 6% 2 7% 6% 6% 5% 4 7% 11% 38%	1710
July	1st to 10th	Night	8% 5% 2 6% 5% 6% 6% 6% 9% 12% 38%	2840
	11th to 20th	Night	10% 6% 2 5% 4 4 4 4 6% 11% 46%	2840
	21st to end	Night	12% 10% 4 11% 6% 7% 6% 5% 8% 9% 23%	3087
August	1st to 10th	Night	7% 5% 3 7% 5% 5% 5% 4 7% 10% 42%	2825
	11th to 20th	Night	10% 5% 2 6% 4 4 5% 4 7% 9% 44%	2785
	21st to end	Night	5% 3 1 3 3 3 4 4 6% 9% 60%	3466
September	1st to 10th	Night	10% 7% 2 5% 5% 4 4 4 6% 8% 46%	2061
	11th to 20th	Night	12% 7% 3 6% 3 5% 4 3 5% 6% 46%	2090
	21st to end	Night	13% 6% 2 6% 4 3 3 3 5% 6% 49%	2090
October	1st to 10th	Night	10% 7% 1 6% 3 2 3 3 4 7% 54%	2090
	11th to 20th	Night	15% 7% 2 4 3 4 3 3 4 6% 48%	2182
	21st to end	Night	15% 8% 2 6% 3 3 3 3 5% 6% 47%	2395
November	1st to 10th	Night	12% 7% 3 5% 3 3 3 3 4 5% 51%	2406
	11th to 20th	Night	14% 9% 2 6% 3 3 4 2 5% 8% 45%	2470
	21st to end	Night	15% 9% 3 6% 4 3 3 4 4 6% 43%	2470
December	1st to 10th	Night	19% 13% 4 8% 4 5% 4 3 5% 5% 28%	2470
	11th to 20th	Night	15% 14% 5% 11% 4 3 3 3 4 6% 33%	3042
	21st to end	Night	16% 15% 5% 9% 6% 5% 6% 5% 6% 6% 21%	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	58% 5% 6% 18% 11% 2	2837
	11th to 20th	Day	63% 5% 6% 14% 11% 1	2840
	21st to end	Day	59% 5% 6% 20% 10% 1	3124
February	1st to 10th	Day	54% 5% 7% 17% 15% 2	1840
	11th to 20th	Day	57% 4 6% 19% 11% 2	1858
	21st to end	Day	57% 4 7% 13% 14% 4	1570
March	1st to 10th	Day	55% 5% 7% 17% 12% 4	3237
	11th to 20th	Day	40% 5% 9% 24% 18% 3	3480
	21st to end	Day	45% 6% 9% 26% 13% 1	3815
April	1st to 10th	Day	43% 6% 10% 22% 15% 3	2144
	11th to 20th	Day	43% 5% 8% 19% 21% 4	2300
	21st to end	Day	45% 7% 10% 24% 12% 2	2470
May	1st to 10th	Day	52% 9% 9% 19% 9% 1	4120
	11th to 20th	Day	51% 7% 9% 22% 10% 1	4085
	21st to end	Day	40% 10% 14% 20% 15% 3	4489
June	1st to 10th	Day	42% 9% 13% 21% 14% 2	2470
	11th to 20th	Day	38% 10% 14% 21% 16% 2	2470
	21st to end	Day	39% 10% 13% 19% 15% 3	2470
July	1st to 10th	Day	39% 12% 19% 17% 11% 1	4055
	11th to 20th	Day	39% 8% 16% 28% 8% 2	4051
	21st to end	Day	63% 7% 10% 12% 7% 1	4324
August	1st to 10th	Day	38% 10% 15% 26% 10%	4091
	11th to 20th	Day	37% 9% 16% 24% 13% 1	4083
	21st to end	Day	26% 8% 15% 36% 13% 1	4184
September	1st to 10th	Day	41% 8% 12% 18% 16% 5%	2100
	11th to 20th	Day	40% 7% 10% 24% 17% 2	2090
	21st to end	Day	39% 7% 10% 21% 20% 3	2090
October	1st to 10th	Day	33% 5% 12% 20% 25% 5%	2090
	11th to 20th	Day	36% 5% 10% 21% 24% 4	1850
	21st to end	Day	41% 3 8% 25% 19% 4	1958
November	1st to 10th	Day	33% 5% 8% 23% 26% 4	1672
	11th to 20th	Day	40% 5% 6% 22% 21% 6%	1710
	21st to end	Day	44% 4 9% 21% 20% 3	1710
December	1st to 10th	Day	56% 5% 7% 20% 10% 2	1710
	11th to 20th	Day	50% 6% 10% 17% 14% 2	2150
	21st to end	Day	55% 5% 10% 21% 9% 1	3124
January	1st to 10th	Night	61% 5% 6% 14% 12% 2	4109
	11th to 20th	Night	57% 5% 5% 14% 16% 3	4120
	21st to end	Night	56% 5% 7% 16% 15% 1	4532
February	1st to 10th	Night	54% 5% 10% 18% 12% 1	2337
	11th to 20th	Night	56% 4 7% 17% 12% 4	2219
	21st to end	Night	59% 5% 7% 13% 12% 4	1884
March	1st to 10th	Night	54% 5% 9% 15% 14% 2	3615
	11th to 20th	Night	37% 5% 8% 30% 12% 8%	3480
	21st to end	Night	43% 6% 11% 24% 15% 1	3817
April	1st to 10th	Night	40% 6% 10% 23% 17% 3	2051
	11th to 20th	Night	40% 6% 10% 19% 18% 6%	1827
	21st to end	Night	39% 8% 13% 26% 12% 2	1710
May	1st to 10th	Night	48% 12% 12% 20% 7% 2	2840
	11th to 20th	Night	47% 8% 11% 25% 9% 1	2813
	21st to end	Night	34% 11% 15% 24% 15% 2	3087
June	1st to 10th	Night	36% 10% 15% 22% 14% 3	1710
	11th to 20th	Night	28% 12% 18% 23% 17% 2	1710
	21st to end	Night	38% 11% 13% 20% 15% 4	1710
July	1st to 10th	Night	35% 11% 22% 22% 10% 1	2795
	11th to 20th	Night	31% 7% 18% 32% 9% 3	2786
	21st to end	Night	52% 11% 13% 16% 7% 1	2988
August	1st to 10th	Night	34% 8% 18% 27% 12% 1	2814
	11th to 20th	Night	34% 9% 15% 29% 13%	2812
	21st to end	Night	20% 7% 15% 38% 19% 2	3466
September	1st to 10th	Night	35% 8% 14% 20% 17% 6%	2061
	11th to 20th	Night	39% 7% 11% 22% 20% 2	2090
	21st to end	Night	36% 4 10% 23% 22% 3	2090
October	1st to 10th	Night	31% 5% 9% 22% 27% 7%	2090
	11th to 20th	Night	36% 6% 8% 20% 24% 5%	2186
	21st to end	Night	38% 4 6% 23% 22% 6%	2395
November	1st to 10th	Night	35% 5% 7% 21% 24% 7%	2406
	11th to 20th	Night	39% 4 6% 21% 22% 7%	2470
	21st to end	Night	43% 4 6% 25% 19% 3	2470
December	1st to 10th	Night	58% 6% 7% 17% 10% 2	2470
	11th to 20th	Night	54% 3 7% 19% 15% 2	3044
	21st to end	Night	57% 10% 9% 14% 10%	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	29% 24% 32% 11% 3 1	270
	11th to 20th	Day	40% 24% 23% 11% 2	270
	21st to end	Day	29% 25% 35% 8% 3	297
February	1st to 10th	Day	31% 22% 31% 13% 3	270
	11th to 20th	Day	45% 21% 27% 5% 1	270
	21st to end	Day	43% 24% 26% 6%	225
March	1st to 10th	Day	31% 23% 27% 17% 3	335
	11th to 20th	Day	29% 22% 28% 17% 3	460
	21st to end	Day	29% 21% 26% 17% 7% 1	506
April	1st to 10th	Day	30% 17% 23% 21% 9% 1	460
	11th to 20th	Day	24% 18% 27% 19% 11% 1	452
	21st to end	Day	25% 13% 29% 19% 11% 2	460
May	1st to 10th	Day	22% 17% 29% 17% 10% 4	463
	11th to 20th	Day	17% 13% 26% 25% 13% 6%	487
	21st to end	Day	17% 8% 19% 26% 17% 12%	529
June	1st to 10th	Day	14% 8% 21% 24% 21% 11%	490
	11th to 20th	Day	8% 6% 19% 31% 23% 13%	490
	21st to end	Day	12% 7% 23% 29% 20% 9%	490
July	1st to 10th	Day	13% 5% 15% 26% 22% 19%	485
	11th to 20th	Day	9% 5% 18% 28% 23% 17%	484
	21st to end	Day	16% 5% 15% 31% 23% 11%	532
August	1st to 10th	Day	14% 6% 17% 25% 26% 12%	486
	11th to 20th	Day	14% 8% 16% 27% 24% 10%	479
	21st to end	Day	10% 5% 10% 27% 31% 17%	539
September	1st to 10th	Day	12% 6% 14% 23% 31% 14%	490
	11th to 20th	Day	15% 3 12% 28% 30% 11%	490
	21st to end	Day	19% 7% 19% 27% 20% 9%	490
October	1st to 10th	Day	14% 6% 21% 29% 22% 7%	490
	11th to 20th	Day	18% 14% 25% 26% 15% 3	462
	21st to end	Day	24% 12% 26% 26% 11% 2	473
November	1st to 10th	Day	17% 14% 33% 23% 11% 2	270
	11th to 20th	Day	26% 13% 35% 20% 6% 1	270
	21st to end	Day	23% 17% 34% 18% 8%	270
December	1st to 10th	Day	30% 23% 27% 14% 6%	270
	11th to 20th	Day	27% 16% 32% 20% 3 1	270
	21st to end	Day	29% 21% 33% 13% 4	297
January	1st to 10th	Night	28% 17% 23% 27% 4	760
	11th to 20th	Night	31% 18% 24% 23% 4	760
	21st to end	Night	24% 17% 28% 27% 3	836
February	1st to 10th	Night	24% 16% 28% 29% 3	760
	11th to 20th	Night	33% 17% 29% 20% 2	743
	21st to end	Night	31% 20% 27% 20% 2	628
March	1st to 10th	Night	26% 15% 26% 28% 5%	760
	11th to 20th	Night	26% 15% 25% 26% 7% 1	760
	21st to end	Night	21% 15% 27% 29% 8%	836
April	1st to 10th	Night	20% 14% 24% 29% 12%	721
	11th to 20th	Night	18% 13% 26% 30% 13% 1	563
	21st to end	Night	16% 9% 29% 33% 12% 1	570
May	1st to 10th	Night	19% 9% 19% 34% 16% 2	570
	11th to 20th	Night	18% 5% 18% 35% 21% 3	561
	21st to end	Night	8% 4 15% 35% 31% 7%	617
June	1st to 10th	Night	9% 4 14% 36% 32% 5%	570
	11th to 20th	Night	5% 3 13% 37% 34% 9%	570
	21st to end	Night	10% 2 11% 38% 33% 5%	570
July	1st to 10th	Night	14% 3 7% 28% 40% 8%	555
	11th to 20th	Night	9% 3 8% 26% 44% 9%	552
	21st to end	Night	10% 4 8% 29% 40% 8%	624
August	1st to 10th	Night	11% 3 7% 29% 44% 7%	567
	11th to 20th	Night	12% 2 8% 34% 38% 7%	564
	21st to end	Night	10% 2 7% 28% 44% 9%	627
September	1st to 10th	Night	13% 3 9% 29% 39% 7%	731
	11th to 20th	Night	15% 2 11% 30% 35% 7%	760
	21st to end	Night	14% 4 17% 30% 31% 4	760
October	1st to 10th	Night	14% 6% 17% 29% 30% 6%	760
	11th to 20th	Night	20% 8% 19% 33% 17% 2	735
	21st to end	Night	20% 9% 21% 32% 16% 2	792
November	1st to 10th	Night	16% 8% 18% 37% 17% 3	740
	11th to 20th	Night	20% 14% 20% 33% 11% 1	760
	21st to end	Night	22% 12% 21% 34% 11%	760
December	1st to 10th	Night	29% 14% 21% 29% 7%	760
	11th to 20th	Night	24% 13% 26% 29% 8% 1	760
	21st to end	Night	29% 16% 21% 30% 4	836

Page generated at 2024-10-11 10:50:01. Version ac07

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