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 2005-11-06 to 2025-03-12.

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 8% 5% 5% 5% 4 6% 7% 36%	109252
	Night	14% 10% 3 7% 4 4 4 3 5% 7% 38%	109785
Transparency	Day	44% 7% 11% 21% 15% 2	113021
	Night	43% 7% 10% 21% 16% 3	114154
Seeing	Day	21% 13% 23% 22% 15% 6%	15239
	Night	19% 10% 19% 30% 18% 3	25394

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	15% 16% 6% 15% 4 3 3 3 4 5% 26%	4056
	11th to 20th	Day	14% 13% 8% 13% 3 5% 3 3 3 3 32%	4060
	21st to end	Day	17% 12% 6% 7% 4 4 4 3 4 6% 34%	4466
February	1st to 10th	Day	16% 12% 5% 9% 5% 5% 4 3 4 6% 31%	1937
	11th to 20th	Day	20% 11% 5% 10% 4 4 4 3 4 5% 29%	1948
	21st to end	Day	22% 12% 4 8% 4 3 3 3 4 5% 33%	1650
March	1st to 10th	Day	21% 14% 4 7% 4 3 3 3 4 6% 31%	3341
	11th to 20th	Day	14% 9% 3 6% 4 3 3 3 5% 6% 44%	3491
	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% 2 6% 3 3 3 2 5% 6% 49%	1919
	21st to end	Day	17% 8% 2 4 3 3 4 2 4 6% 46%	2066
November	1st to 10th	Day	10% 7% 2 6% 4 4 4 4 5% 6% 50%	1762
	11th to 20th	Day	13% 9% 3 6% 4 3 4 4 5% 7% 43%	1800
	21st to end	Day	14% 12% 4 6% 3 3 4 3 5% 6% 41%	1800
December	1st to 10th	Day	13% 11% 4 9% 5% 4 4 3 5% 5% 38%	2930
	11th to 20th	Day	18% 17% 5% 8% 5% 4 4 3 5% 6% 25%	3373
	21st to end	Day	13% 15% 6% 8% 5% 5% 5% 4 6% 7% 26%	4466
January	1st to 10th	Night	14% 17% 7% 15% 6% 4 3 3 4 4 25%	5889
	11th to 20th	Night	19% 12% 5% 9% 6% 5% 3 2 3 4 31%	5900
	21st to end	Night	17% 11% 3 7% 4 4 4 3 4 5% 38%	6490
February	1st to 10th	Night	16% 12% 4 9% 5% 4 4 4 6% 7% 30%	2460
	11th to 20th	Night	22% 11% 5% 9% 5% 4 4 3 4 5% 29%	2338
	21st to end	Night	20% 13% 4 8% 5% 4 4 3 5% 5% 29%	1980
March	1st to 10th	Night	21% 14% 3 7% 4 4 4 3 5% 6% 30%	3731
	11th to 20th	Night	12% 9% 2 4 4 3 4 3 5% 6% 47%	3498
	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% 49%	2259
	21st to end	Night	14% 7% 2 6% 3 3 3 3 5% 6% 49%	2529
November	1st to 10th	Night	12% 7% 3 5% 3 3 3 3 5% 6% 50%	2536
	11th to 20th	Night	14% 9% 2 6% 3 3 4 2 5% 8% 44%	2600
	21st to end	Night	15% 10% 3 6% 4 3 3 3 4 6% 42%	2600
December	1st to 10th	Night	15% 12% 4 10% 5% 5% 4 2 4 4 35%	4250
	11th to 20th	Night	17% 16% 6% 10% 4 3 3 3 3 5% 30%	4822
	21st to end	Night	14% 14% 6% 8% 5% 5% 5% 5% 6% 7% 25%	6490

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	60% 5% 6% 20% 9% 1	4057
	11th to 20th	Day	57% 5% 5% 14% 17% 2	4060
	21st to end	Day	50% 5% 7% 24% 13% 1	4466
February	1st to 10th	Day	54% 5% 8% 17% 14% 2	1937
	11th to 20th	Day	59% 4 6% 18% 11% 2	1958
	21st to end	Day	55% 4 7% 15% 15% 4	1650
March	1st to 10th	Day	54% 5% 7% 17% 12% 4	3341
	11th to 20th	Day	40% 5% 9% 24% 18% 3	3491
	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	25% 5% 9% 19% 36% 6%	3480
	11th to 20th	Day	26% 3 10% 23% 29% 9%	3172
	21st to end	Day	29% 3 10% 29% 18% 10%	3380
November	1st to 10th	Day	35% 5% 9% 22% 26% 4	1762
	11th to 20th	Day	41% 5% 7% 21% 21% 5%	1800
	21st to end	Day	45% 4 9% 20% 19% 3	1800
December	1st to 10th	Day	48% 5% 6% 19% 21% 1	2930
	11th to 20th	Day	60% 5% 8% 17% 10% 2	3370
	21st to end	Day	55% 7% 11% 19% 8%	4466
January	1st to 10th	Night	61% 6% 7% 16% 9% 1	5889
	11th to 20th	Night	56% 6% 5% 14% 16% 4	5900
	21st to end	Night	48% 5% 7% 17% 21% 2	6490
February	1st to 10th	Night	54% 4 10% 18% 12% 1	2460
	11th to 20th	Night	58% 4 7% 16% 11% 4	2339
	21st to end	Night	57% 5% 6% 15% 13% 4	1980
March	1st to 10th	Night	53% 5% 9% 15% 14% 3	3731
	11th to 20th	Night	37% 5% 8% 30% 12% 8%	3498
	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	27% 7% 7% 21% 32% 6%	3480
	11th to 20th	Night	26% 5% 7% 22% 27% 13%	3745
	21st to end	Night	24% 4 8% 28% 25% 12%	4165
November	1st to 10th	Night	36% 5% 7% 21% 24% 7%	2536
	11th to 20th	Night	40% 4 6% 20% 22% 7%	2600
	21st to end	Night	44% 4 5% 25% 19% 3	2600
December	1st to 10th	Night	53% 6% 6% 19% 16% 1	4250
	11th to 20th	Night	58% 4 7% 19% 11% 1	4824
	21st to end	Night	54% 9% 11% 16% 10%	6490

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	30% 26% 31% 10% 3 1	300
	11th to 20th	Day	39% 25% 23% 11% 2	300
	21st to end	Day	29% 25% 35% 8% 3	330
February	1st to 10th	Day	29% 25% 31% 12% 3	300
	11th to 20th	Day	47% 20% 26% 5% 1	300
	21st to end	Day	40% 24% 28% 7%	249
March	1st to 10th	Day	33% 22% 25% 17% 3	369
	11th to 20th	Day	29% 22% 28% 18% 3	464
	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	17% 14% 23% 25% 16% 3	490
	21st to end	Day	22% 11% 26% 27% 11% 2	515
November	1st to 10th	Day	17% 15% 34% 21% 10% 2	300
	11th to 20th	Day	27% 13% 35% 19% 6% 1	300
	21st to end	Day	24% 18% 33% 17% 7%	300
December	1st to 10th	Day	30% 23% 29% 13% 5%	300
	11th to 20th	Day	30% 16% 31% 19% 3 1	300
	21st to end	Day	29% 21% 32% 13% 5%	330
January	1st to 10th	Night	29% 18% 23% 27% 4	800
	11th to 20th	Night	31% 19% 25% 22% 4	800
	21st to end	Night	24% 17% 30% 27% 3	880
February	1st to 10th	Night	25% 16% 29% 29% 3	800
	11th to 20th	Night	34% 17% 28% 19% 2	783
	21st to end	Night	30% 19% 27% 21% 2	660
March	1st to 10th	Night	27% 15% 26% 28% 5%	800
	11th to 20th	Night	26% 15% 25% 26% 7% 1	767
	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% 34% 18% 2	760
	21st to end	Night	19% 9% 21% 33% 16% 2	836
November	1st to 10th	Night	16% 8% 20% 37% 17% 3	780
	11th to 20th	Night	21% 13% 21% 33% 11% 1	800
	21st to end	Night	23% 12% 21% 33% 10%	800
December	1st to 10th	Night	29% 15% 22% 28% 6%	800
	11th to 20th	Night	25% 13% 26% 28% 7% 1	800
	21st to end	Night	29% 16% 21% 30% 4	880

Page generated at 2025-03-09 08:08:46. Version ac07

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