Pine Glades Natural Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pine Glades Natural Area clear sky chart from 2005-11-06 to 2025-05-26.

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	8% 5% 2 7% 6% 6% 6% 5% 8% 10% 35%	114182
	Night	7% 5% 2 7% 5% 5% 5% 5% 7% 10% 42%	115108
Transparency	Day	41% 6% 17% 21% 12% 3	117879
	Night	38% 5% 18% 23% 12% 3	119550
Seeing	Day	8% 5% 19% 27% 23% 18%	16683
	Night	8% 3 16% 31% 31% 11%	26854

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	7% 6% 2 6% 5% 4 4 3 6% 7% 50%	4056
	11th to 20th	Day	15% 7% 4 9% 6% 6% 5% 5% 6% 9% 29%	4060
	21st to end	Day	13% 7% 3 8% 6% 5% 5% 3 6% 7% 37%	4466
February	1st to 10th	Day	9% 7% 2 7% 5% 6% 5% 4 8% 10% 39%	1990
	11th to 20th	Day	7% 5% 2 5% 4 5% 5% 4 7% 10% 47%	2052
	21st to end	Day	8% 4 2 7% 5% 6% 5% 5% 7% 9% 44%	1815
March	1st to 10th	Day	6% 5% 3 8% 6% 6% 6% 5% 7% 9% 39%	4935
	11th to 20th	Day	3 3 1 4 4 4 4 3 6% 8% 60%	4980
	21st to end	Day	8% 5% 2 7% 5% 5% 5% 5% 8% 10% 41%	5465
April	1st to 10th	Day	4 4 2 5% 6% 6% 5% 6% 8% 10% 44%	2200
	11th to 20th	Day	7% 6% 2 7% 6% 5% 6% 5% 8% 9% 39%	2290
	21st to end	Day	6% 4 2 6% 5% 6% 5% 5% 8% 9% 44%	2400
May	1st to 10th	Day	3 2 1 4 3 4 5% 6% 7% 10% 56%	3885
	11th to 20th	Day	8% 5% 3 7% 6% 6% 7% 6% 8% 11% 35%	4004
	21st to end	Day	5% 4 2 5% 5% 5% 6% 5% 8% 10% 43%	4541
June	1st to 10th	Day	12% 9% 4 10% 8% 7% 7% 6% 8% 10% 18%	2470
	11th to 20th	Day	9% 5% 3 9% 8% 8% 9% 7% 9% 11% 22%	2470
	21st to end	Day	8% 7% 3 9% 7% 9% 8% 6% 9% 11% 23%	2470
July	1st to 10th	Day	6% 6% 3 8% 6% 8% 7% 7% 9% 11% 28%	4120
	11th to 20th	Day	6% 6% 3 8% 7% 7% 7% 7% 9% 13% 27%	4120
	21st to end	Day	5% 5% 3 8% 8% 7% 8% 7% 10% 14% 26%	4466
August	1st to 10th	Day	6% 6% 3 11% 8% 8% 9% 7% 10% 12% 21%	4056
	11th to 20th	Day	4 4 2 7% 6% 6% 8% 7% 11% 15% 30%	3730
	21st to end	Day	5% 5% 2 8% 6% 7% 9% 7% 12% 17% 20%	3966
September	1st to 10th	Day	8% 7% 3 11% 8% 9% 8% 7% 9% 11% 19%	2090
	11th to 20th	Day	9% 6% 2 10% 7% 8% 10% 7% 10% 11% 20%	2090
	21st to end	Day	9% 8% 4 12% 9% 7% 8% 6% 8% 10% 19%	2090
October	1st to 10th	Day	9% 7% 4 9% 8% 6% 7% 5% 9% 10% 27%	1986
	11th to 20th	Day	9% 6% 3 7% 6% 7% 7% 6% 8% 11% 31%	1900
	21st to end	Day	11% 5% 3 6% 5% 6% 6% 5% 9% 10% 34%	2090
November	1st to 10th	Day	8% 6% 2 7% 6% 6% 7% 5% 6% 9% 38%	1957
	11th to 20th	Day	11% 6% 3 8% 6% 5% 6% 5% 7% 9% 34%	2000
	21st to end	Day	9% 5% 2 6% 5% 6% 6% 5% 7% 9% 41%	2000
December	1st to 10th	Day	7% 4 2 5% 4 4 4 4 7% 7% 51%	3133
	11th to 20th	Day	11% 5% 2 7% 6% 6% 7% 6% 8% 9% 33%	3373
	21st to end	Day	11% 7% 3 9% 6% 6% 6% 6% 7% 10% 29%	4466
January	1st to 10th	Night	6% 5% 2 6% 5% 5% 5% 4 7% 10% 46%	5889
	11th to 20th	Night	14% 10% 4 9% 6% 5% 5% 4 6% 8% 30%	5900
	21st to end	Night	14% 7% 3 7% 5% 4 4 4 5% 8% 39%	6490
February	1st to 10th	Night	8% 6% 3 6% 5% 3 4 4 5% 9% 46%	2405
	11th to 20th	Night	8% 4 1 4 3 3 4 4 5% 8% 55%	2231
	21st to end	Night	5% 4 2 5% 4 3 5% 4 6% 9% 52%	1815
March	1st to 10th	Night	6% 5% 2 7% 5% 4 5% 4 6% 8% 49%	4918
	11th to 20th	Night	4 2 1 4 3 3 4 3 6% 9% 60%	4980
	21st to end	Night	6% 5% 2 7% 4 5% 5% 4 7% 9% 46%	5467
April	1st to 10th	Night	4 4 1 5% 4 3 4 4 6% 9% 57%	2200
	11th to 20th	Night	5% 3 2 5% 5% 4 5% 5% 6% 10% 50%	2055
	21st to end	Night	4 3 1 5% 4 5% 6% 5% 7% 9% 51%	2000
May	1st to 10th	Night	2 2 1 3 3 3 4 4 6% 9% 64%	3230
	11th to 20th	Night	7% 4 2 6% 4 4 5% 4 7% 11% 45%	3136
	21st to end	Night	5% 4 2 6% 4 4 5% 4 7% 11% 49%	3130
June	1st to 10th	Night	11% 8% 3 8% 5% 5% 6% 6% 9% 10% 28%	1710
	11th to 20th	Night	7% 8% 3 7% 5% 5% 7% 6% 8% 12% 30%	1710
	21st to end	Night	6% 7% 3 7% 5% 5% 6% 6% 8% 12% 34%	1710
July	1st to 10th	Night	5% 6% 2 6% 5% 5% 5% 4 8% 11% 42%	2840
	11th to 20th	Night	3 5% 2 7% 6% 6% 7% 6% 10% 14% 35%	2840
	21st to end	Night	3 5% 2 6% 6% 6% 6% 6% 10% 11% 39%	3087
August	1st to 10th	Night	5% 5% 2 8% 6% 5% 6% 6% 8% 14% 36%	2840
	11th to 20th	Night	3 4 1 6% 5% 5% 5% 5% 9% 15% 41%	3097
	21st to end	Night	4 4 2 7% 7% 8% 8% 8% 11% 15% 25%	3684
September	1st to 10th	Night	7% 6% 2 8% 6% 6% 7% 8% 10% 12% 27%	2090
	11th to 20th	Night	7% 6% 3 9% 7% 7% 8% 5% 9% 10% 29%	2090
	21st to end	Night	9% 7% 3 10% 6% 6% 7% 7% 9% 11% 26%	2090
October	1st to 10th	Night	10% 6% 3 9% 6% 6% 7% 5% 8% 10% 31%	2191
	11th to 20th	Night	9% 5% 3 6% 5% 5% 6% 5% 7% 10% 40%	2280
	21st to end	Night	9% 5% 3 6% 5% 5% 6% 4 6% 9% 41%	2508
November	1st to 10th	Night	9% 5% 2 7% 5% 4 5% 5% 8% 9% 41%	2341
	11th to 20th	Night	8% 5% 3 7% 5% 6% 5% 5% 7% 8% 41%	2400
	21st to end	Night	9% 6% 3 7% 5% 5% 4 4 5% 8% 44%	2400
December	1st to 10th	Night	7% 4 2 5% 4 3 4 3 5% 7% 57%	4042
	11th to 20th	Night	14% 8% 3 7% 5% 5% 5% 4 5% 7% 36%	4822
	21st to end	Night	10% 8% 4 9% 6% 6% 5% 5% 7% 8% 32%	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	34% 3 8% 25% 26% 4	4057
	11th to 20th	Day	53% 3 13% 21% 9% 2	4060
	21st to end	Day	48% 2 5% 28% 13% 4	4466
February	1st to 10th	Day	39% 4 9% 25% 17% 6%	1990
	11th to 20th	Day	31% 4 8% 30% 19% 7%	2062
	21st to end	Day	36% 4 10% 18% 24% 7%	1815
March	1st to 10th	Day	42% 3 12% 20% 21% 3	4935
	11th to 20th	Day	23% 2 13% 29% 22% 12%	4980
	21st to end	Day	38% 3 8% 30% 16% 5%	5465
April	1st to 10th	Day	31% 5% 13% 29% 19% 4	2200
	11th to 20th	Day	39% 4 12% 21% 18% 5%	2290
	21st to end	Day	35% 4 9% 24% 25% 3	2400
May	1st to 10th	Day	21% 2 14% 38% 21% 3	3920
	11th to 20th	Day	42% 4 24% 23% 7%	4008
	21st to end	Day	35% 3 16% 34% 12%	4554
June	1st to 10th	Day	58% 6% 18% 14% 4	2470
	11th to 20th	Day	52% 8% 19% 20% 2	2470
	21st to end	Day	49% 10% 25% 14% 2	2470
July	1st to 10th	Day	41% 10% 30% 17% 2	4055
	11th to 20th	Day	44% 8% 36% 12%	4051
	21st to end	Day	41% 11% 31% 16%	4324
August	1st to 10th	Day	50% 10% 30% 10% 1	4043
	11th to 20th	Day	36% 10% 34% 18% 2	3766
	21st to end	Day	44% 12% 35% 9% 1	3966
September	1st to 10th	Day	53% 11% 22% 12% 2	2090
	11th to 20th	Day	52% 10% 23% 13% 2	2090
	21st to end	Day	57% 9% 15% 13% 6% 1	2090
October	1st to 10th	Day	53% 8% 17% 15% 6% 1	3298
	11th to 20th	Day	42% 5% 14% 21% 17% 1	3140
	21st to end	Day	37% 5% 8% 28% 19% 4	3428
November	1st to 10th	Day	41% 5% 9% 19% 18% 8%	1957
	11th to 20th	Day	47% 3 8% 22% 15% 6%	2000
	21st to end	Day	39% 3 11% 21% 20% 6%	2000
December	1st to 10th	Day	31% 4 16% 26% 18% 6%	3133
	11th to 20th	Day	44% 5% 9% 19% 17% 5%	3370
	21st to end	Day	49% 4 14% 18% 14% 2	4466
January	1st to 10th	Night	34% 2 12% 28% 18% 6%	5889
	11th to 20th	Night	53% 2 16% 18% 9% 2	5900
	21st to end	Night	45% 2 7% 29% 11% 5%	6490
February	1st to 10th	Night	35% 3 13% 26% 18% 5%	2405
	11th to 20th	Night	29% 3 10% 29% 22% 7%	2232
	21st to end	Night	28% 4 13% 24% 25% 6%	1815
March	1st to 10th	Night	36% 3 11% 24% 23% 4	4918
	11th to 20th	Night	22% 3 18% 29% 18% 9%	4980
	21st to end	Night	34% 3 12% 27% 21% 3	5467
April	1st to 10th	Night	24% 4 19% 31% 17% 5%	2200
	11th to 20th	Night	30% 5% 15% 23% 22% 5%	2055
	21st to end	Night	29% 4 14% 28% 21% 4	2000
May	1st to 10th	Night	19% 3 18% 41% 15% 3	3260
	11th to 20th	Night	32% 4 24% 31% 8%	3137
	21st to end	Night	31% 3 18% 37% 11%	3138
June	1st to 10th	Night	48% 7% 23% 17% 5%	1710
	11th to 20th	Night	44% 9% 26% 19% 2	1710
	21st to end	Night	41% 11% 32% 15% 2	1710
July	1st to 10th	Night	35% 8% 36% 20% 1	2795
	11th to 20th	Night	36% 10% 44% 9% 1	2786
	21st to end	Night	34% 11% 38% 16% 1	2988
August	1st to 10th	Night	39% 9% 36% 14% 2	2829
	11th to 20th	Night	30% 9% 38% 20% 3	3127
	21st to end	Night	43% 13% 35% 7% 1	3684
September	1st to 10th	Night	45% 15% 26% 13% 1	2090
	11th to 20th	Night	47% 11% 27% 13% 2	2090
	21st to end	Night	49% 11% 18% 16% 6%	2090
October	1st to 10th	Night	54% 8% 16% 15% 6% 1	3659
	11th to 20th	Night	42% 4 13% 24% 17% 1	3779
	21st to end	Night	37% 4 10% 27% 17% 4	4120
November	1st to 10th	Night	38% 5% 12% 19% 19% 7%	2341
	11th to 20th	Night	39% 4 11% 24% 17% 5%	2400
	21st to end	Night	39% 4 11% 20% 20% 5%	2400
December	1st to 10th	Night	28% 3 16% 32% 18% 3	4042
	11th to 20th	Night	47% 4 12% 17% 15% 6%	4824
	21st to end	Night	49% 4 14% 17% 11% 4	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	9% 11% 38% 33% 8% 1	300
	11th to 20th	Day	11% 9% 38% 27% 13% 3	300
	21st to end	Day	14% 11% 45% 24% 6% 1	330
February	1st to 10th	Day	10% 7% 30% 37% 12% 4	300
	11th to 20th	Day	7% 9% 28% 36% 17% 4	404
	21st to end	Day	7% 7% 27% 36% 21% 2	414
March	1st to 10th	Day	6% 10% 38% 29% 15% 2	500
	11th to 20th	Day	6% 9% 32% 31% 19% 3	500
	21st to end	Day	5% 6% 30% 33% 21% 5%	550
April	1st to 10th	Day	4 9% 34% 30% 17% 5%	500
	11th to 20th	Day	7% 7% 30% 30% 18% 8%	492
	21st to end	Day	5% 4 23% 35% 24% 9%	500
May	1st to 10th	Day	4 2 21% 35% 23% 14%	503
	11th to 20th	Day	10% 5% 17% 30% 25% 13%	527
	21st to end	Day	11% 2 10% 26% 27% 24%	549
June	1st to 10th	Day	12% 3 11% 25% 26% 22%	490
	11th to 20th	Day	9% 3 8% 19% 27% 34%	490
	21st to end	Day	5% 2 4 15% 29% 46%	490
July	1st to 10th	Day	4 2 3 15% 28% 48%	485
	11th to 20th	Day	6% 1 2 13% 33% 44%	484
	21st to end	Day	5% 2 4 18% 28% 43%	532
August	1st to 10th	Day	6% 2 6% 16% 28% 42%	486
	11th to 20th	Day	4 1 3 13% 32% 47%	479
	21st to end	Day	8% 1 8% 20% 27% 35%	539
September	1st to 10th	Day	8% 2 5% 18% 26% 42%	490
	11th to 20th	Day	5% 3 6% 20% 30% 36%	490
	21st to end	Day	9% 3 10% 22% 30% 27%	490
October	1st to 10th	Day	13% 4 13% 30% 30% 11%	490
	11th to 20th	Day	10% 4 18% 32% 24% 12%	490
	21st to end	Day	8% 5% 21% 32% 28% 6%	539
November	1st to 10th	Day	9% 4 22% 33% 23% 8%	495
	11th to 20th	Day	11% 6% 23% 33% 22% 5%	500
	21st to end	Day	8% 5% 25% 38% 22% 3	500
December	1st to 10th	Day	9% 6% 25% 35% 19% 4	425
	11th to 20th	Day	7% 7% 27% 40% 15% 4	300
	21st to end	Day	10% 10% 26% 33% 15% 4	330
January	1st to 10th	Night	10% 6% 23% 38% 22% 2	800
	11th to 20th	Night	11% 6% 29% 36% 18% 2	800
	21st to end	Night	9% 7% 30% 40% 12% 1	880
February	1st to 10th	Night	9% 7% 23% 40% 19% 2	800
	11th to 20th	Night	8% 4 27% 39% 20% 1	783
	21st to end	Night	7% 3 27% 42% 20%	660
March	1st to 10th	Night	5% 5% 34% 40% 15% 1	800
	11th to 20th	Night	7% 4 24% 44% 20% 2	800
	21st to end	Night	4 5% 25% 44% 22% 1	880
April	1st to 10th	Night	5% 4 22% 47% 21% 2	800
	11th to 20th	Night	5% 4 23% 45% 21% 2	791
	21st to end	Night	4 2 20% 47% 25% 2	800
May	1st to 10th	Night	5% 1 15% 46% 31% 2	800
	11th to 20th	Night	8% 3 16% 39% 30% 4	734
	21st to end	Night	7% 2 6% 27% 46% 12%	634
June	1st to 10th	Night	12% 3 4 23% 45% 13%	570
	11th to 20th	Night	8% 2 5% 18% 44% 24%	570
	21st to end	Night	6% 4 4 10% 42% 35%	570
July	1st to 10th	Night	5% 2 2 9% 44% 38%	555
	11th to 20th	Night	5% 1 2 6% 47% 39%	552
	21st to end	Night	5% 1 1 9% 46% 38%	624
August	1st to 10th	Night	5% 1 4 8% 48% 33%	569
	11th to 20th	Night	5% 1 4 8% 48% 35%	750
	21st to end	Night	8% 1 6% 15% 41% 30%	836
September	1st to 10th	Night	9% 2 5% 10% 43% 31%	760
	11th to 20th	Night	9% 2 3 16% 44% 27%	760
	21st to end	Night	12% 2 8% 15% 43% 20%	760
October	1st to 10th	Night	11% 3 7% 31% 38% 10%	760
	11th to 20th	Night	10% 3 9% 33% 37% 9%	760
	21st to end	Night	11% 2 15% 36% 30% 7%	836
November	1st to 10th	Night	10% 3 20% 33% 30% 4	780
	11th to 20th	Night	9% 4 20% 37% 28% 3	800
	21st to end	Night	10% 4 19% 42% 24% 2	800
December	1st to 10th	Night	8% 4 17% 38% 30% 4	800
	11th to 20th	Night	10% 6% 17% 39% 25% 3	800
	21st to end	Night	9% 5% 22% 35% 26% 3	880

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