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 2026-07-16.

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	13% 9% 3 8% 5% 5% 5% 4 6% 7% 35%	137860
	Night	13% 9% 3 8% 5% 4 4 4 5% 7% 37%	134851
Transparency	Day	45% 7% 11% 21% 14% 2	141585
	Night	44% 7% 10% 21% 15% 3	139197
Seeing	Day	21% 13% 24% 22% 14% 6%	17075
	Night	19% 10% 20% 30% 18% 3	27111

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% 14% 6% 13% 4 3 3 3 5% 5% 27%	5258
	11th to 20th	Day	12% 12% 7% 13% 4 5% 3 3 3 3 36%	5280
	21st to end	Day	17% 12% 6% 7% 6% 4 3 3 4 6% 33%	5780
February	1st to 10th	Day	16% 12% 5% 9% 5% 5% 4 3 4 6% 31%	2034
	11th to 20th	Day	21% 11% 5% 10% 4 4 4 3 4 6% 29%	2048
	21st to end	Day	21% 12% 4 9% 4 3 3 3 3 5% 32%	1730
March	1st to 10th	Day	17% 14% 5% 8% 4 4 4 3 4 5% 32%	4756
	11th to 20th	Day	12% 9% 3 7% 4 4 4 3 6% 6% 43%	5090
	21st to end	Day	14% 9% 3 7% 4 4 4 3 6% 7% 39%	5586
April	1st to 10th	Day	12% 8% 2 7% 5% 4 4 5% 5% 8% 39%	2370
	11th to 20th	Day	15% 8% 2 7% 4 4 4 4 6% 7% 42%	2546
	21st to end	Day	15% 8% 2 7% 5% 5% 5% 4 6% 6% 37%	2730
May	1st to 10th	Day	16% 9% 3 8% 5% 5% 5% 5% 6% 7% 30%	7616
	11th to 20th	Day	13% 7% 3 8% 6% 6% 5% 5% 6% 7% 34%	7626
	21st to end	Day	15% 9% 4 10% 6% 6% 6% 5% 7% 8% 25%	8391
June	1st to 10th	Day	11% 6% 2 7% 6% 6% 5% 5% 8% 9% 35%	2730
	11th to 20th	Day	7% 5% 2 7% 5% 7% 7% 5% 7% 10% 37%	2730
	21st to end	Day	8% 5% 2 7% 6% 5% 6% 5% 9% 11% 36%	2730
July	1st to 10th	Day	7% 5% 2 7% 6% 6% 7% 5% 6% 9% 38%	6030
	11th to 20th	Day	9% 6% 3 9% 7% 6% 7% 6% 8% 11% 29%	5965
	21st to end	Day	13% 10% 4 10% 6% 6% 7% 5% 7% 9% 22%	6424
August	1st to 10th	Day	9% 6% 3 7% 5% 5% 6% 5% 8% 11% 35%	4234
	11th to 20th	Day	10% 5% 2 6% 5% 6% 6% 5% 8% 11% 36%	4174
	21st to end	Day	5% 3 2 5% 3 4 4 4 7% 9% 53%	4317
September	1st to 10th	Day	13% 6% 3 7% 6% 5% 6% 4 5% 7% 40%	2210
	11th to 20th	Day	13% 6% 2 5% 4 5% 4 4 6% 8% 43%	2200
	21st to end	Day	16% 7% 2 6% 3 3 3 4 6% 7% 42%	2200
October	1st to 10th	Day	10% 5% 2 6% 4 4 3 3 5% 7% 52%	2200
	11th to 20th	Day	13% 7% 2 5% 3 3 3 2 5% 6% 51%	2020
	21st to end	Day	17% 8% 3 5% 3 3 4 2 4 7% 45%	2175
November	1st to 10th	Day	10% 7% 2 6% 4 4 4 4 5% 6% 49%	1852
	11th to 20th	Day	12% 9% 3 6% 4 3 4 4 5% 7% 43%	1890
	21st to end	Day	14% 12% 4 6% 3 3 4 3 4 6% 40%	1890
December	1st to 10th	Day	13% 11% 4 9% 5% 4 4 3 5% 5% 37%	3020
	11th to 20th	Day	18% 17% 5% 8% 5% 4 4 3 5% 6% 26%	3463
	21st to end	Day	13% 15% 6% 8% 5% 5% 5% 4 6% 7% 26%	4565
January	1st to 10th	Night	14% 16% 6% 13% 5% 3 3 3 4 5% 29%	7635
	11th to 20th	Night	17% 11% 4 9% 5% 5% 3 3 3 4 35%	7680
	21st to end	Night	17% 12% 4 9% 4 4 4 3 4 4 35%	8401
February	1st to 10th	Night	16% 11% 4 9% 5% 4 4 4 5% 7% 30%	2583
	11th to 20th	Night	22% 11% 5% 9% 5% 4 4 3 4 4 29%	2458
	21st to end	Night	20% 13% 4 10% 5% 4 4 3 4 4 29%	2076
March	1st to 10th	Night	17% 13% 3 7% 4 4 4 3 5% 6% 34%	5316
	11th to 20th	Night	11% 9% 3 4 3 3 4 3 5% 7% 49%	5090
	21st to end	Night	12% 8% 3 6% 5% 5% 6% 5% 6% 7% 37%	5588
April	1st to 10th	Night	12% 8% 3 6% 4 4 4 3 5% 8% 43%	2267
	11th to 20th	Night	12% 8% 2 5% 5% 3 4 4 6% 7% 43%	2021
	21st to end	Night	12% 8% 3 6% 6% 3 4 4 6% 7% 41%	1890
May	1st to 10th	Night	16% 7% 3 8% 5% 5% 5% 4 7% 10% 31%	5237
	11th to 20th	Night	13% 7% 3 8% 5% 5% 6% 4 5% 7% 35%	5234
	21st to end	Night	15% 9% 4 11% 6% 5% 5% 4 6% 7% 29%	5761
June	1st to 10th	Night	8% 6% 3 6% 6% 4 6% 6% 7% 10% 39%	1890
	11th to 20th	Night	5% 4 2 6% 5% 5% 5% 5% 8% 11% 44%	1890
	21st to end	Night	8% 5% 2 6% 6% 6% 5% 4 7% 12% 38%	1890
July	1st to 10th	Night	7% 5% 2 6% 5% 5% 6% 5% 9% 11% 38%	4148
	11th to 20th	Night	9% 6% 3 7% 5% 5% 5% 4 8% 12% 37%	4102
	21st to end	Night	10% 8% 3 10% 6% 6% 6% 5% 8% 10% 26%	4427
August	1st to 10th	Night	7% 6% 3 7% 5% 5% 5% 4 7% 10% 42%	2915
	11th to 20th	Night	9% 5% 2 6% 4 4 5% 4 7% 9% 45%	2875
	21st to end	Night	5% 3 1 3 3 3 4 4 6% 9% 59%	3576
September	1st to 10th	Night	10% 7% 2 6% 5% 4 4 4 5% 8% 46%	2170
	11th to 20th	Night	11% 7% 3 6% 3 5% 4 3 5% 7% 47%	2200
	21st to end	Night	13% 6% 3 6% 3 4 3 3 5% 6% 48%	2200
October	1st to 10th	Night	10% 7% 1 5% 3 2 3 3 4 7% 55%	2200
	11th to 20th	Night	14% 6% 2 4 3 3 3 3 4 6% 50%	2378
	21st to end	Night	15% 8% 2 6% 3 3 3 3 5% 5% 48%	2662
November	1st to 10th	Night	12% 7% 3 5% 3 3 3 3 4 5% 50%	2666
	11th to 20th	Night	14% 9% 3 6% 3 3 4 2 4 8% 45%	2730
	21st to end	Night	15% 10% 3 6% 4 3 3 4 4 6% 42%	2730
December	1st to 10th	Night	15% 12% 4 10% 5% 5% 4 2 4 4 35%	4380
	11th to 20th	Night	17% 16% 6% 10% 4 3 3 3 3 5% 30%	4952
	21st to end	Night	14% 14% 6% 9% 5% 5% 5% 5% 6% 7% 25%	6633

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	59% 5% 7% 19% 9% 1	5259
	11th to 20th	Day	52% 5% 5% 16% 20% 3	5280
	21st to end	Day	52% 4 8% 24% 11% 1	5780
February	1st to 10th	Day	54% 5% 8% 17% 14% 2	2034
	11th to 20th	Day	58% 4 6% 19% 11% 2	2058
	21st to end	Day	56% 3 7% 16% 14% 4	1730
March	1st to 10th	Day	53% 5% 7% 15% 15% 6%	4756
	11th to 20th	Day	40% 5% 8% 20% 23% 5%	5090
	21st to end	Day	43% 6% 9% 27% 14% 1	5586
April	1st to 10th	Day	42% 6% 12% 23% 14% 3	2370
	11th to 20th	Day	42% 5% 9% 20% 20% 4	2546
	21st to end	Day	45% 7% 11% 24% 12% 2	2730
May	1st to 10th	Day	49% 8% 11% 20% 11% 1	7651
	11th to 20th	Day	46% 8% 13% 21% 12% 1	7630
	21st to end	Day	52% 10% 11% 15% 10% 2	8405
June	1st to 10th	Day	42% 9% 13% 20% 15% 2	2730
	11th to 20th	Day	39% 10% 14% 21% 15% 2	2730
	21st to end	Day	38% 10% 14% 20% 14% 3	2730
July	1st to 10th	Day	38% 11% 16% 20% 14% 1	5965
	11th to 20th	Day	43% 12% 17% 21% 5% 1	5896
	21st to end	Day	54% 10% 13% 17% 6%	6240
August	1st to 10th	Day	39% 10% 15% 26% 10%	4221
	11th to 20th	Day	37% 9% 16% 24% 12% 1	4213
	21st to end	Day	26% 8% 15% 37% 14% 1	4316
September	1st to 10th	Day	41% 8% 12% 18% 16% 5%	2210
	11th to 20th	Day	39% 7% 10% 25% 17% 2	2200
	21st to end	Day	39% 7% 10% 21% 20% 3	2200
October	1st to 10th	Day	25% 5% 9% 19% 36% 6%	3590
	11th to 20th	Day	25% 3 10% 24% 29% 9%	3273
	21st to end	Day	30% 3 10% 29% 18% 10%	3489
November	1st to 10th	Day	35% 5% 9% 22% 25% 4	1852
	11th to 20th	Day	40% 5% 7% 22% 21% 5%	1890
	21st to end	Day	45% 4 8% 21% 18% 3	1890
December	1st to 10th	Day	48% 5% 6% 19% 21% 1	3020
	11th to 20th	Day	59% 5% 8% 16% 10% 2	3460
	21st to end	Day	56% 7% 10% 19% 8%	4565
January	1st to 10th	Night	56% 6% 11% 19% 7% 1	7636
	11th to 20th	Night	51% 5% 5% 16% 19% 3	7680
	21st to end	Night	52% 5% 7% 17% 17% 2	8401
February	1st to 10th	Night	54% 4 10% 18% 12% 1	2583
	11th to 20th	Night	58% 4 6% 17% 11% 3	2459
	21st to end	Night	58% 4 6% 15% 13% 3	2076
March	1st to 10th	Night	50% 5% 8% 18% 14% 5%	5316
	11th to 20th	Night	34% 4 7% 27% 20% 6%	5090
	21st to end	Night	44% 7% 11% 25% 12% 1	5588
April	1st to 10th	Night	40% 5% 11% 24% 17% 3	2267
	11th to 20th	Night	38% 6% 10% 22% 17% 6%	2021
	21st to end	Night	39% 8% 13% 26% 12% 1	1890
May	1st to 10th	Night	46% 10% 12% 22% 9% 1	5264
	11th to 20th	Night	46% 8% 13% 22% 11%	5235
	21st to end	Night	52% 9% 12% 17% 9% 1	5771
June	1st to 10th	Night	36% 10% 15% 22% 14% 3	1890
	11th to 20th	Night	30% 12% 18% 23% 16% 2	1890
	21st to end	Night	37% 11% 13% 21% 15% 3	1890
July	1st to 10th	Night	35% 11% 19% 22% 12% 1	4105
	11th to 20th	Night	37% 12% 20% 24% 6% 2	4051
	21st to end	Night	48% 13% 15% 18% 6%	4297
August	1st to 10th	Night	35% 9% 18% 27% 11% 1	2904
	11th to 20th	Night	33% 9% 15% 29% 13%	2902
	21st to end	Night	20% 7% 15% 37% 19% 1	3576
September	1st to 10th	Night	35% 8% 14% 20% 18% 6%	2170
	11th to 20th	Night	38% 7% 11% 23% 20% 2	2200
	21st to end	Night	37% 5% 11% 23% 22% 3	2200
October	1st to 10th	Night	27% 6% 7% 22% 32% 6%	3590
	11th to 20th	Night	25% 5% 7% 23% 27% 13%	3864
	21st to end	Night	25% 4 7% 27% 25% 12%	4298
November	1st to 10th	Night	36% 5% 8% 22% 23% 7%	2666
	11th to 20th	Night	40% 4 6% 21% 22% 6%	2730
	21st to end	Night	44% 4 6% 25% 18% 3	2730
December	1st to 10th	Night	53% 6% 6% 19% 15% 1	4380
	11th to 20th	Night	58% 4 7% 19% 11% 1	4954
	21st to end	Night	54% 9% 11% 15% 10%	6633

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% 25% 32% 10% 2 1	330
	11th to 20th	Day	39% 25% 23% 11% 2	330
	21st to end	Day	31% 26% 33% 7% 3	363
February	1st to 10th	Day	28% 25% 33% 11% 2	330
	11th to 20th	Day	47% 20% 26% 6% 1	330
	21st to end	Day	40% 23% 28% 7% 1	273
March	1st to 10th	Day	31% 23% 27% 16% 2	402
	11th to 20th	Day	31% 22% 28% 16% 3	540
	21st to end	Day	28% 21% 30% 15% 6% 1	594
April	1st to 10th	Day	28% 18% 25% 21% 8% 1	540
	11th to 20th	Day	23% 19% 29% 18% 9% 1	532
	21st to end	Day	24% 14% 31% 19% 10% 1	540
May	1st to 10th	Day	23% 18% 30% 16% 9% 3	543
	11th to 20th	Day	17% 13% 28% 25% 12% 5%	567
	21st to end	Day	20% 9% 21% 25% 15% 11%	617
June	1st to 10th	Day	13% 9% 23% 25% 21% 10%	570
	11th to 20th	Day	8% 8% 21% 30% 21% 11%	570
	21st to end	Day	11% 7% 22% 28% 21% 10%	570
July	1st to 10th	Day	13% 5% 15% 27% 22% 18%	565
	11th to 20th	Day	9% 6% 18% 28% 23% 16%	544
	21st to end	Day	15% 5% 14% 31% 25% 11%	576
August	1st to 10th	Day	15% 6% 17% 26% 26% 11%	526
	11th to 20th	Day	13% 8% 16% 28% 25% 10%	519
	21st to end	Day	10% 5% 13% 27% 30% 16%	583
September	1st to 10th	Day	12% 7% 15% 23% 29% 13%	530
	11th to 20th	Day	14% 3 13% 28% 31% 12%	530
	21st to end	Day	18% 7% 20% 27% 19% 8%	530
October	1st to 10th	Day	13% 6% 21% 30% 22% 7%	530
	11th to 20th	Day	17% 13% 24% 26% 16% 3	530
	21st to end	Day	23% 12% 27% 26% 11% 2	558
November	1st to 10th	Day	18% 15% 35% 22% 9% 2	330
	11th to 20th	Day	27% 13% 35% 19% 5% 1	330
	21st to end	Day	25% 18% 34% 16% 7%	330
December	1st to 10th	Day	30% 23% 31% 12% 5%	330
	11th to 20th	Day	30% 17% 32% 18% 3 1	330
	21st to end	Day	31% 21% 31% 12% 4	363
January	1st to 10th	Night	28% 18% 24% 27% 4	840
	11th to 20th	Night	31% 18% 25% 22% 4	840
	21st to end	Night	24% 17% 30% 26% 3	924
February	1st to 10th	Night	25% 16% 29% 29% 3	840
	11th to 20th	Night	34% 17% 29% 18% 2	823
	21st to end	Night	30% 20% 27% 21% 2	692
March	1st to 10th	Night	25% 15% 27% 28% 5%	840
	11th to 20th	Night	26% 15% 26% 25% 7% 1	840
	21st to end	Night	21% 16% 29% 27% 7%	924
April	1st to 10th	Night	21% 15% 25% 29% 11%	797
	11th to 20th	Night	17% 13% 27% 30% 12% 1	623
	21st to end	Night	16% 9% 29% 34% 12% 1	630
May	1st to 10th	Night	19% 10% 21% 34% 15% 2	630
	11th to 20th	Night	17% 6% 19% 35% 20% 3	621
	21st to end	Night	10% 5% 16% 34% 28% 6%	683
June	1st to 10th	Night	9% 4 13% 37% 31% 5%	630
	11th to 20th	Night	6% 4 13% 37% 32% 8%	630
	21st to end	Night	10% 2 11% 38% 34% 5%	630
July	1st to 10th	Night	13% 2 7% 27% 41% 9%	615
	11th to 20th	Night	9% 4 8% 25% 44% 10%	597
	21st to end	Night	9% 4 8% 29% 41% 8%	657
August	1st to 10th	Night	11% 3 8% 29% 42% 6%	597
	11th to 20th	Night	11% 2 8% 34% 39% 6%	594
	21st to end	Night	10% 2 7% 30% 42% 9%	660
September	1st to 10th	Night	12% 3 11% 29% 38% 7%	770
	11th to 20th	Night	15% 2 11% 30% 36% 7%	800
	21st to end	Night	15% 5% 17% 30% 30% 4	800
October	1st to 10th	Night	13% 6% 16% 30% 30% 6%	800
	11th to 20th	Night	19% 8% 18% 36% 18% 2	800
	21st to end	Night	20% 9% 21% 33% 15% 2	880
November	1st to 10th	Night	16% 8% 21% 36% 16% 3	820
	11th to 20th	Night	21% 14% 22% 33% 10% 1	840
	21st to end	Night	24% 13% 21% 32% 10%	840
December	1st to 10th	Night	29% 15% 23% 28% 6%	840
	11th to 20th	Night	25% 13% 27% 27% 7% 1	840
	21st to end	Night	28% 16% 22% 30% 4	924

Page generated at 2026-07-13 03:14:51. Version ac07

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