Middletown
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Middletown clear sky chart from 2005-11-06 to 2026-03-03.

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	16% 7% 2 6% 4 4 5% 4 6% 7% 38%	131052
	Night	17% 7% 2 6% 4 4 4 3 5% 7% 40%	130116
Transparency	Day	43% 6% 12% 22% 14% 2	134553
	Night	43% 6% 12% 22% 15% 2	134689
Seeing	Day	22% 15% 29% 21% 10% 3	16508
	Night	21% 13% 30% 27% 9% 1	25773

By Month

Percentage Cloud Cover NE (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	11% 7% 3 9% 5% 5% 6% 4 5% 6% 39%	4661
	11th to 20th	Day	14% 10% 3 9% 5% 5% 4 3 5% 6% 37%	4650
	21st to end	Day	15% 8% 3 6% 4 4 4 3 5% 6% 41%	5559
February	1st to 10th	Day	14% 9% 3 8% 6% 5% 6% 3 5% 6% 36%	1890
	11th to 20th	Day	13% 8% 4 6% 6% 5% 5% 3 6% 6% 38%	2017
	21st to end	Day	17% 10% 3 6% 5% 4 4 3 4 6% 38%	1730
March	1st to 10th	Day	21% 7% 2 6% 4 4 4 3 4 5% 39%	4496
	11th to 20th	Day	13% 7% 3 6% 4 4 5% 4 5% 7% 42%	4828
	21st to end	Day	20% 7% 2 5% 4 4 4 4 5% 6% 39%	5896
April	1st to 10th	Day	19% 8% 2 7% 5% 5% 4 4 5% 6% 37%	2400
	11th to 20th	Day	17% 8% 3 7% 4 4 4 3 4 7% 39%	2374
	21st to end	Day	18% 7% 3 7% 4 4 5% 4 5% 6% 38%	2425
May	1st to 10th	Day	30% 7% 2 5% 4 4 4 4 6% 7% 28%	5973
	11th to 20th	Day	21% 8% 2 7% 5% 4 5% 4 6% 6% 34%	6318
	21st to end	Day	20% 6% 2 6% 4 5% 5% 5% 7% 9% 32%	6949
June	1st to 10th	Day	16% 6% 2 5% 5% 5% 5% 4 6% 9% 36%	2800
	11th to 20th	Day	16% 6% 3 7% 5% 4 4 5% 7% 8% 35%	2800
	21st to end	Day	13% 5% 2 7% 5% 4 5% 5% 6% 9% 38%	2800
July	1st to 10th	Day	10% 7% 3 7% 5% 5% 6% 4 7% 9% 36%	6360
	11th to 20th	Day	10% 6% 2 7% 5% 5% 6% 5% 8% 12% 34%	6360
	21st to end	Day	13% 6% 2 6% 4 4 5% 4 6% 8% 42%	6926
August	1st to 10th	Day	20% 5% 2 6% 4 6% 5% 4 6% 7% 33%	4366
	11th to 20th	Day	13% 6% 2 6% 4 4 5% 4 7% 9% 40%	3850
	21st to end	Day	13% 5% 2 4 3 3 4 3 5% 10% 46%	4312
September	1st to 10th	Day	15% 6% 2 6% 4 5% 4 4 4 6% 44%	2400
	11th to 20th	Day	13% 4 2 5% 3 3 4 3 5% 8% 50%	2330
	21st to end	Day	18% 6% 2 5% 4 5% 5% 3 7% 6% 40%	2200
October	1st to 10th	Day	19% 6% 2 6% 4 4 3 3 5% 6% 42%	2058
	11th to 20th	Day	15% 6% 2 6% 3 5% 4 4 5% 8% 42%	2000
	21st to end	Day	22% 5% 2 5% 4 4 5% 4 5% 6% 37%	2045
November	1st to 10th	Day	13% 6% 2 6% 4 3 3 3 4 6% 51%	1851
	11th to 20th	Day	16% 7% 2 6% 3 3 4 4 7% 6% 43%	1890
	21st to end	Day	17% 8% 2 7% 4 5% 5% 4 6% 6% 37%	1744
December	1st to 10th	Day	16% 6% 2 8% 5% 5% 4 4 6% 7% 37%	2680
	11th to 20th	Day	22% 7% 1 4 4 3 3 3 5% 7% 41%	3066
	21st to end	Day	18% 8% 3 8% 5% 5% 5% 4 6% 8% 31%	4048
January	1st to 10th	Night	12% 9% 2 9% 5% 6% 5% 4 6% 6% 37%	8234
	11th to 20th	Night	14% 9% 3 10% 5% 4 4 3 5% 6% 37%	8235
	21st to end	Night	14% 8% 2 5% 4 5% 5% 4 6% 6% 41%	8607
February	1st to 10th	Night	15% 9% 2 6% 5% 4 5% 3 5% 6% 40%	2730
	11th to 20th	Night	15% 8% 3 7% 5% 4 5% 4 6% 6% 37%	2488
	21st to end	Night	16% 10% 2 6% 5% 4 4 4 4 5% 40%	2076
March	1st to 10th	Night	20% 8% 3 5% 3 3 3 3 5% 6% 41%	5389
	11th to 20th	Night	14% 8% 3 5% 4 4 4 4 5% 6% 43%	5127
	21st to end	Night	17% 9% 3 7% 4 4 4 3 5% 5% 39%	5036
April	1st to 10th	Night	20% 7% 3 6% 5% 5% 4 4 5% 7% 36%	2000
	11th to 20th	Night	18% 7% 2 6% 4 4 5% 3 5% 7% 38%	1975
	21st to end	Night	19% 6% 2 6% 4 3 3 3 4 6% 42%	1975
May	1st to 10th	Night	33% 7% 2 5% 3 3 3 3 6% 7% 29%	4008
	11th to 20th	Night	23% 8% 2 6% 4 3 4 3 6% 6% 35%	3575
	21st to end	Night	21% 7% 3 7% 4 4 4 3 5% 7% 35%	3926
June	1st to 10th	Night	16% 6% 2 6% 4 5% 4 3 6% 8% 41%	1600
	11th to 20th	Night	15% 5% 2 5% 4 5% 5% 4 5% 10% 40%	1600
	21st to end	Night	12% 5% 2 5% 3 4 5% 3 7% 11% 45%	1600
July	1st to 10th	Night	12% 7% 2 7% 4 4 4 4 7% 9% 40%	3600
	11th to 20th	Night	13% 6% 3 7% 5% 5% 5% 4 6% 10% 36%	3600
	21st to end	Night	13% 5% 2 5% 4 4 4 4 6% 7% 46%	3926
August	1st to 10th	Night	20% 5% 3 7% 4 5% 5% 4 5% 8% 35%	2749
	11th to 20th	Night	15% 5% 3 7% 5% 4 5% 3 5% 6% 42%	3183
	21st to end	Night	12% 5% 2 4 3 4 3 3 5% 7% 52%	3586
September	1st to 10th	Night	15% 6% 2 4 3 4 3 4 5% 6% 48%	2000
	11th to 20th	Night	13% 5% 2 5% 3 3 3 2 4 7% 53%	2070
	21st to end	Night	18% 6% 3 4 3 4 3 3 5% 6% 45%	2200
October	1st to 10th	Night	21% 5% 2 6% 4 3 4 3 4 5% 44%	2339
	11th to 20th	Night	18% 5% 1 5% 3 3 3 3 5% 6% 48%	2400
	21st to end	Night	22% 7% 2 4 3 3 3 3 5% 7% 41%	2795
November	1st to 10th	Night	12% 6% 2 6% 4 3 4 3 5% 6% 48%	2667
	11th to 20th	Night	18% 6% 2 4 4 3 4 3 5% 6% 44%	2730
	21st to end	Night	16% 6% 2 5% 4 4 4 3 6% 7% 43%	2872
December	1st to 10th	Night	14% 8% 3 6% 3 4 3 3 5% 6% 44%	4720
	11th to 20th	Night	25% 8% 2 4 3 3 4 3 4 5% 39%	5348
	21st to end	Night	19% 10% 3 7% 5% 4 4 3 5% 6% 35%	7150

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% 5% 11% 25% 12% 2	4662
	11th to 20th	Day	45% 5% 9% 20% 16% 5%	4680
	21st to end	Day	42% 5% 11% 25% 16% 1	5559
February	1st to 10th	Day	48% 6% 11% 20% 14% 1	1890
	11th to 20th	Day	45% 6% 10% 21% 15% 2	2026
	21st to end	Day	46% 5% 12% 23% 12% 2	1730
March	1st to 10th	Day	47% 5% 10% 18% 11% 8%	4499
	11th to 20th	Day	38% 8% 16% 28% 8% 4	4828
	21st to end	Day	46% 4 10% 13% 22% 5%	5896
April	1st to 10th	Day	47% 6% 10% 20% 13% 4	2400
	11th to 20th	Day	45% 6% 12% 20% 15% 3	2374
	21st to end	Day	45% 7% 10% 21% 14% 4	2425
May	1st to 10th	Day	54% 7% 14% 14% 10% 1	5984
	11th to 20th	Day	49% 8% 11% 20% 12% 1	6322
	21st to end	Day	45% 8% 14% 21% 11% 1	6949
June	1st to 10th	Day	42% 9% 15% 19% 13% 1	2800
	11th to 20th	Day	43% 9% 15% 22% 10% 2	2800
	21st to end	Day	41% 8% 13% 24% 13% 1	2800
July	1st to 10th	Day	45% 8% 12% 20% 14% 1	6290
	11th to 20th	Day	42% 6% 18% 24% 11%	6285
	21st to end	Day	41% 5% 12% 22% 19% 1	6728
August	1st to 10th	Day	49% 7% 15% 20% 9% 1	4352
	11th to 20th	Day	39% 7% 17% 27% 9%	3886
	21st to end	Day	35% 6% 12% 31% 15% 1	4312
September	1st to 10th	Day	40% 7% 12% 24% 16% 2	2400
	11th to 20th	Day	33% 7% 11% 24% 23% 2	2330
	21st to end	Day	43% 7% 11% 20% 17% 2	2200
October	1st to 10th	Day	40% 5% 7% 20% 24% 3	3344
	11th to 20th	Day	33% 6% 9% 28% 23% 3	3240
	21st to end	Day	31% 5% 17% 27% 18% 4	3283
November	1st to 10th	Day	36% 5% 13% 25% 18% 3	1851
	11th to 20th	Day	41% 6% 11% 23% 17% 3	1890
	21st to end	Day	45% 6% 13% 26% 9% 1	1744
December	1st to 10th	Day	47% 5% 15% 24% 9%	2680
	11th to 20th	Day	44% 4 15% 22% 13% 2	3066
	21st to end	Day	49% 7% 11% 18% 13% 1	4048
January	1st to 10th	Night	48% 5% 11% 21% 14% 2	8234
	11th to 20th	Night	47% 5% 12% 18% 13% 5%	8280
	21st to end	Night	42% 5% 11% 20% 19% 3	8607
February	1st to 10th	Night	45% 6% 14% 21% 12% 2	2730
	11th to 20th	Night	46% 6% 11% 20% 15% 3	2490
	21st to end	Night	45% 5% 9% 24% 14% 3	2076
March	1st to 10th	Night	44% 6% 13% 18% 14% 5%	5399
	11th to 20th	Night	40% 7% 18% 23% 10% 3	5128
	21st to end	Night	47% 6% 7% 16% 21% 3	5036
April	1st to 10th	Night	48% 6% 11% 19% 13% 3	2000
	11th to 20th	Night	45% 7% 11% 18% 18% 1	1975
	21st to end	Night	42% 8% 9% 21% 16% 4	1975
May	1st to 10th	Night	55% 5% 13% 16% 10% 1	4014
	11th to 20th	Night	49% 7% 13% 15% 15% 1	3576
	21st to end	Night	46% 7% 14% 22% 9% 1	3927
June	1st to 10th	Night	40% 8% 12% 22% 18% 1	1600
	11th to 20th	Night	39% 8% 16% 26% 10%	1600
	21st to end	Night	33% 9% 16% 25% 15% 1	1600
July	1st to 10th	Night	41% 7% 15% 19% 15% 2	3560
	11th to 20th	Night	45% 6% 15% 22% 11% 1	3552
	21st to end	Night	36% 6% 13% 25% 19% 1	3809
August	1st to 10th	Night	48% 7% 17% 18% 9% 1	2739
	11th to 20th	Night	43% 6% 15% 27% 9%	3213
	21st to end	Night	33% 6% 12% 34% 15% 1	3586
September	1st to 10th	Night	37% 7% 13% 25% 18% 1	2000
	11th to 20th	Night	32% 5% 11% 26% 25% 2	2070
	21st to end	Night	40% 6% 10% 22% 21% 1	2200
October	1st to 10th	Night	42% 5% 9% 22% 20% 1	3820
	11th to 20th	Night	28% 5% 10% 29% 25% 3	3899
	21st to end	Night	33% 5% 14% 30% 18% 1	4507
November	1st to 10th	Night	37% 6% 12% 23% 21% 2	2667
	11th to 20th	Night	42% 5% 11% 22% 18% 3	2730
	21st to end	Night	40% 6% 15% 28% 10% 1	2872
December	1st to 10th	Night	43% 5% 13% 30% 9% 1	4720
	11th to 20th	Night	47% 5% 13% 18% 14% 2	5348
	21st to end	Night	50% 6% 11% 18% 12% 3	7150

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% 24% 29% 14% 4	220
	11th to 20th	Day	39% 24% 25% 10% 2	220
	21st to end	Day	26% 27% 31% 12% 3 2	322
February	1st to 10th	Day	29% 25% 34% 10% 2	330
	11th to 20th	Day	31% 24% 34% 10% 1	505
	21st to end	Day	29% 23% 34% 11% 3	446
March	1st to 10th	Day	27% 22% 31% 15% 4	508
	11th to 20th	Day	27% 24% 28% 16% 4 1	500
	21st to end	Day	31% 19% 31% 13% 5% 2	550
April	1st to 10th	Day	33% 22% 27% 12% 6% 1	500
	11th to 20th	Day	28% 23% 29% 11% 7% 2	492
	21st to end	Day	29% 18% 31% 15% 6% 1	500
May	1st to 10th	Day	34% 16% 27% 14% 6% 2	503
	11th to 20th	Day	21% 17% 35% 18% 7% 2	527
	21st to end	Day	21% 9% 29% 26% 13% 2	573
June	1st to 10th	Day	20% 12% 30% 24% 12% 1	530
	11th to 20th	Day	17% 13% 29% 27% 13% 1	530
	21st to end	Day	16% 12% 30% 29% 10% 2	530
July	1st to 10th	Day	13% 9% 29% 28% 16% 5%	525
	11th to 20th	Day	11% 5% 29% 31% 19% 5%	524
	21st to end	Day	14% 7% 32% 33% 11% 4	576
August	1st to 10th	Day	12% 7% 27% 31% 17% 7%	526
	11th to 20th	Day	15% 5% 27% 30% 16% 6%	519
	21st to end	Day	13% 9% 28% 27% 16% 7%	583
September	1st to 10th	Day	19% 10% 23% 25% 16% 8%	530
	11th to 20th	Day	13% 8% 28% 20% 18% 13%	530
	21st to end	Day	22% 9% 26% 26% 12% 5%	530
October	1st to 10th	Day	24% 12% 22% 23% 13% 6%	530
	11th to 20th	Day	18% 16% 31% 21% 13% 2	530
	21st to end	Day	26% 11% 35% 18% 9% 1	498
November	1st to 10th	Day	20% 16% 30% 23% 9% 2	425
	11th to 20th	Day	24% 22% 27% 20% 6% 1	430
	21st to end	Day	27% 20% 31% 17% 4 1	284
December	1st to 10th	Day	25% 25% 32% 12% 5%	220
	11th to 20th	Day	36% 18% 28% 16% 2	220
	21st to end	Day	25% 23% 34% 14% 4	242
January	1st to 10th	Night	21% 18% 38% 20% 3	840
	11th to 20th	Night	24% 18% 33% 22% 3	840
	21st to end	Night	19% 20% 37% 21% 2	924
February	1st to 10th	Night	21% 17% 38% 22% 1	840
	11th to 20th	Night	25% 20% 38% 16% 1	823
	21st to end	Night	24% 18% 38% 17% 3	692
March	1st to 10th	Night	24% 20% 33% 20% 3	809
	11th to 20th	Night	22% 22% 32% 21% 3	800
	21st to end	Night	21% 19% 35% 20% 5%	880
April	1st to 10th	Night	26% 17% 34% 19% 4	800
	11th to 20th	Night	24% 16% 32% 23% 5%	791
	21st to end	Night	24% 14% 29% 26% 6% 1	775
May	1st to 10th	Night	28% 12% 30% 24% 6%	580
	11th to 20th	Night	23% 10% 31% 30% 6%	394
	21st to end	Night	15% 8% 24% 40% 12% 1	433
June	1st to 10th	Night	17% 5% 29% 37% 13%	400
	11th to 20th	Night	14% 7% 29% 36% 15%	400
	21st to end	Night	12% 4 25% 45% 14% 1	400
July	1st to 10th	Night	14% 3 19% 43% 20% 1	390
	11th to 20th	Night	13% 3 21% 43% 20% 1	388
	21st to end	Night	11% 5% 22% 45% 17% 1	438
August	1st to 10th	Night	11% 2 21% 44% 20% 2	496
	11th to 20th	Night	14% 4 17% 41% 23% 2	776
	21st to end	Night	15% 5% 19% 38% 22% 2	880
September	1st to 10th	Night	15% 5% 23% 36% 18% 2	800
	11th to 20th	Night	15% 5% 22% 30% 23% 4	800
	21st to end	Night	20% 5% 23% 33% 17% 2	800
October	1st to 10th	Night	22% 10% 24% 25% 17% 2	800
	11th to 20th	Night	20% 11% 28% 31% 10%	800
	21st to end	Night	25% 11% 33% 24% 7%	880
November	1st to 10th	Night	18% 12% 34% 27% 9% 1	820
	11th to 20th	Night	23% 18% 29% 23% 6% 1	840
	21st to end	Night	20% 17% 33% 24% 7%	840
December	1st to 10th	Night	25% 17% 31% 22% 5%	840
	11th to 20th	Night	24% 18% 31% 24% 3	840
	21st to end	Night	26% 15% 36% 20% 2	924

Page generated at 2026-02-28 01:40:25. Version ac07

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