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 2024-11-02.

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% 6% 3 8% 6% 6% 7% 6% 8% 11% 33%	100645
	Night	7% 5% 2 7% 5% 5% 5% 5% 7% 10% 41%	98275
Transparency	Day	43% 6% 18% 20% 10% 2	100452
	Night	38% 6% 20% 22% 11% 3	98138
Seeing	Day	8% 4 18% 27% 24% 19%	15933
	Night	8% 3 15% 31% 31% 11%	26041

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	10% 8% 3 8% 6% 5% 5% 4 6% 6% 39%	2836
	11th to 20th	Day	15% 7% 3 9% 6% 6% 5% 5% 7% 9% 27%	2840
	21st to end	Day	8% 7% 4 10% 7% 6% 5% 4 6% 7% 36%	3124
February	1st to 10th	Day	9% 7% 2 7% 5% 6% 5% 3 8% 9% 37%	1890
	11th to 20th	Day	8% 5% 2 5% 4 5% 5% 4 7% 9% 48%	1946
	21st to end	Day	8% 4 2 6% 5% 5% 5% 5% 6% 9% 44%	1727
March	1st to 10th	Day	7% 6% 3 9% 7% 7% 8% 6% 9% 9% 28%	3435
	11th to 20th	Day	4 4 1 4 5% 5% 5% 4 7% 10% 51%	3480
	21st to end	Day	10% 5% 2 5% 4 4 4 4 7% 9% 44%	3815
April	1st to 10th	Day	5% 4 2 5% 6% 6% 6% 6% 8% 10% 43%	2090
	11th to 20th	Day	8% 6% 2 7% 6% 5% 6% 5% 8% 10% 37%	2174
	21st to end	Day	6% 5% 2 6% 6% 6% 5% 5% 7% 9% 43%	2280
May	1st to 10th	Day	3 2 1 4 3 4 5% 5% 7% 10% 57%	3765
	11th to 20th	Day	8% 5% 3 7% 6% 6% 6% 6% 9% 11% 34%	3880
	21st to end	Day	5% 4 2 5% 5% 5% 6% 5% 8% 10% 43%	4476
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% 8% 10% 34%	2090
November	1st to 10th	Day	8% 7% 2 7% 5% 6% 7% 4 6% 8% 38%	1867
	11th to 20th	Day	12% 6% 3 8% 6% 5% 6% 5% 7% 9% 34%	1900
	21st to end	Day	9% 5% 2 7% 5% 6% 6% 5% 7% 9% 39%	1900
December	1st to 10th	Day	10% 6% 2 6% 6% 5% 5% 4 8% 9% 39%	1829
	11th to 20th	Day	12% 5% 2 8% 6% 5% 5% 5% 6% 8% 39%	2153
	21st to end	Day	13% 8% 3 8% 6% 6% 6% 7% 7% 10% 28%	3124
January	1st to 10th	Night	8% 6% 3 8% 6% 5% 5% 5% 6% 9% 39%	4109
	11th to 20th	Night	15% 10% 4 8% 6% 4 5% 4 6% 8% 29%	4120
	21st to end	Night	8% 6% 3 9% 6% 5% 6% 5% 6% 9% 38%	4532
February	1st to 10th	Night	9% 6% 3 6% 5% 3 4 4 6% 10% 45%	2285
	11th to 20th	Night	8% 4 1 4 3 3 4 4 6% 8% 55%	2117
	21st to end	Night	5% 4 2 5% 4 4 5% 4 6% 9% 52%	1727
March	1st to 10th	Night	8% 7% 3 9% 6% 6% 6% 5% 6% 8% 36%	3418
	11th to 20th	Night	4 3 1 4 3 4 4 4 7% 12% 54%	3480
	21st to end	Night	6% 4 2 6% 4 4 5% 4 6% 9% 49%	3817
April	1st to 10th	Night	4 4 1 5% 4 3 4 4 6% 9% 56%	2090
	11th to 20th	Night	5% 3 2 5% 5% 5% 5% 5% 7% 11% 47%	1951
	21st to end	Night	4 3 1 5% 4 5% 6% 5% 6% 10% 51%	1900
May	1st to 10th	Night	2 2 1 3 3 3 3 4 5% 8% 64%	3130
	11th to 20th	Night	6% 4 2 6% 4 4 5% 5% 7% 12% 45%	3039
	21st to end	Night	5% 4 2 6% 4 4 5% 4 7% 10% 49%	3079
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% 8% 42%	2234
	11th to 20th	Night	8% 5% 4 7% 5% 6% 5% 5% 7% 8% 41%	2280
	21st to end	Night	9% 6% 3 7% 5% 5% 5% 4 6% 9% 42%	2280
December	1st to 10th	Night	7% 5% 2 6% 5% 4 5% 4 6% 8% 48%	2346
	11th to 20th	Night	14% 7% 2 6% 4 4 4 4 5% 7% 43%	3042
	21st to end	Night	11% 8% 4 9% 6% 6% 5% 4 7% 8% 32%	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	46% 3 7% 20% 21% 4	2837
	11th to 20th	Day	54% 3 11% 19% 9% 3	2840
	21st to end	Day	49% 2 7% 21% 16% 6%	3124
February	1st to 10th	Day	41% 4 8% 25% 16% 6%	1890
	11th to 20th	Day	32% 4 8% 29% 20% 8%	1956
	21st to end	Day	36% 4 10% 18% 25% 8%	1727
March	1st to 10th	Day	49% 4 15% 17% 12% 3	3435
	11th to 20th	Day	29% 2 18% 35% 13% 3	3480
	21st to end	Day	37% 2 8% 32% 16% 6%	3815
April	1st to 10th	Day	32% 5% 14% 29% 16% 4	2090
	11th to 20th	Day	41% 4 13% 22% 17% 3	2174
	21st to end	Day	36% 5% 9% 23% 24% 3	2280
May	1st to 10th	Day	21% 2 13% 39% 22% 4	3800
	11th to 20th	Day	43% 4 24% 22% 7%	3884
	21st to end	Day	35% 3 15% 34% 12%	4489
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	50% 7% 14% 18% 10% 2	1986
	11th to 20th	Day	44% 6% 13% 21% 15% 2	1900
	21st to end	Day	43% 5% 8% 19% 19% 6%	2090
November	1st to 10th	Day	41% 5% 9% 19% 19% 8%	1867
	11th to 20th	Day	47% 3 8% 22% 14% 5%	1900
	21st to end	Day	41% 3 12% 21% 19% 4	1900
December	1st to 10th	Day	41% 5% 11% 23% 17% 3	1829
	11th to 20th	Day	42% 4 8% 19% 20% 8%	2150
	21st to end	Day	50% 3 11% 18% 14% 3	3124
January	1st to 10th	Night	42% 2 12% 25% 15% 3	4109
	11th to 20th	Night	54% 2 12% 20% 9% 3	4120
	21st to end	Night	45% 2 10% 23% 13% 7%	4532
February	1st to 10th	Night	35% 4 13% 26% 18% 5%	2285
	11th to 20th	Night	29% 3 10% 29% 22% 7%	2118
	21st to end	Night	28% 4 13% 24% 25% 6%	1727
March	1st to 10th	Night	46% 3 13% 22% 12% 4	3418
	11th to 20th	Night	25% 3 25% 33% 12% 3	3480
	21st to end	Night	32% 2 13% 25% 24% 4	3817
April	1st to 10th	Night	25% 4 19% 32% 15% 5%	2090
	11th to 20th	Night	32% 5% 16% 25% 21% 2	1951
	21st to end	Night	30% 4 14% 27% 20% 4	1900
May	1st to 10th	Night	19% 3 18% 42% 16% 3	3160
	11th to 20th	Night	33% 4 25% 30% 8%	3040
	21st to end	Night	31% 3 18% 38% 11%	3087
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	46% 7% 17% 19% 10% 2	2191
	11th to 20th	Night	39% 5% 15% 23% 18% 1	2280
	21st to end	Night	38% 4 12% 22% 18% 5%	2508
November	1st to 10th	Night	38% 5% 12% 19% 19% 7%	2234
	11th to 20th	Night	40% 4 11% 24% 16% 5%	2280
	21st to end	Night	41% 4 11% 21% 19% 4	2280
December	1st to 10th	Night	34% 4 13% 29% 16% 4	2346
	11th to 20th	Night	42% 2 10% 19% 17% 10%	3044
	21st to end	Night	50% 4 12% 17% 13% 5%	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	10% 9% 37% 35% 9% 1	270
	11th to 20th	Day	10% 7% 37% 29% 14% 3	270
	21st to end	Day	13% 11% 45% 25% 5% 1	297
February	1st to 10th	Day	11% 7% 32% 36% 11% 2	270
	11th to 20th	Day	8% 8% 26% 37% 17% 4	368
	21st to end	Day	7% 6% 25% 38% 22% 2	382
March	1st to 10th	Day	5% 8% 38% 30% 16% 2	460
	11th to 20th	Day	7% 7% 32% 31% 20% 3	460
	21st to end	Day	5% 5% 29% 34% 22% 5%	506
April	1st to 10th	Day	4 10% 33% 29% 17% 6%	460
	11th to 20th	Day	8% 7% 29% 29% 18% 8%	452
	21st to end	Day	5% 4 24% 33% 25% 9%	460
May	1st to 10th	Day	5% 2 20% 35% 24% 15%	463
	11th to 20th	Day	10% 4 17% 31% 24% 14%	487
	21st to end	Day	11% 2 9% 26% 28% 24%	529
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	10% 4 20% 32% 24% 9%	459
	11th to 20th	Day	12% 6% 23% 32% 23% 5%	460
	21st to end	Day	8% 4 24% 40% 22% 3	460
December	1st to 10th	Day	10% 5% 23% 37% 20% 5%	389
	11th to 20th	Day	8% 7% 24% 42% 16% 4	270
	21st to end	Day	10% 10% 25% 34% 17% 5%	297
January	1st to 10th	Night	11% 6% 21% 38% 23% 2	760
	11th to 20th	Night	10% 6% 27% 37% 18% 2	760
	21st to end	Night	8% 6% 31% 41% 13% 1	836
February	1st to 10th	Night	9% 8% 23% 41% 18% 2	760
	11th to 20th	Night	8% 4 26% 40% 20% 1	743
	21st to end	Night	7% 3 27% 42% 21%	628
March	1st to 10th	Night	5% 4 33% 40% 16% 1	760
	11th to 20th	Night	7% 3 23% 44% 21% 2	760
	21st to end	Night	4 4 24% 44% 23% 1	836
April	1st to 10th	Night	5% 3 22% 47% 21% 2	760
	11th to 20th	Night	6% 4 23% 45% 21% 2	751
	21st to end	Night	4 2 21% 47% 25% 2	760
May	1st to 10th	Night	5% 1 14% 45% 32% 2	760
	11th to 20th	Night	8% 3 15% 39% 31% 4	697
	21st to end	Night	7% 2 7% 27% 46% 12%	617
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	11% 3 20% 32% 31% 4	745
	11th to 20th	Night	9% 4 20% 36% 27% 4	760
	21st to end	Night	10% 4 19% 42% 24% 2	760
December	1st to 10th	Night	8% 3 16% 38% 31% 4	760
	11th to 20th	Night	11% 5% 16% 38% 26% 3	760
	21st to end	Night	9% 5% 21% 34% 27% 3	836

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