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 2024-01-22.

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	15% 8% 3 6% 6% 3 5% 5% 5% 7% 36%	75191
	Night	16% 8% 4 6% 5% 3 4 4 5% 7% 38%	74748
Transparency	Day	48% 3 11% 23% 14% 2	74904
	Night	47% 3 10% 23% 14% 2	74555
Seeing	Day	19% 8% 24% 24% 17% 8%	14246
	Night	20% 6% 24% 32% 16% 2	24087

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	18% 13% 5% 8% 6% 4 5% 5% 4 6% 26%	1517
	11th to 20th	Day	20% 14% 6% 10% 7% 3 4 3 4 5% 24%	1638
	21st to end	Day	16% 16% 5% 9% 6% 3 5% 4 5% 6% 24%	1791
February	1st to 10th	Day	21% 13% 5% 8% 6% 3 4 5% 5% 4 26%	1704
	11th to 20th	Day	18% 11% 4 10% 8% 3 4 4 4 6% 28%	1748
	21st to end	Day	19% 13% 4 10% 5% 2 3 3 4 5% 31%	1480
March	1st to 10th	Day	18% 10% 3 6% 6% 4 5% 4 4 6% 34%	1813
	11th to 20th	Day	19% 11% 4 6% 5% 3 4 5% 5% 6% 32%	1980
	21st to end	Day	23% 10% 4 6% 5% 3 5% 4 5% 6% 29%	2178
April	1st to 10th	Day	15% 10% 3 7% 5% 4 4 5% 5% 7% 36%	2124
	11th to 20th	Day	18% 8% 3 5% 6% 3 4 4 4 7% 39%	2190
	21st to end	Day	19% 8% 3 7% 5% 3 4 5% 5% 7% 34%	2340
May	1st to 10th	Day	21% 7% 3 6% 5% 4 5% 5% 4 6% 33%	2340
	11th to 20th	Day	20% 7% 3 6% 6% 4 4 5% 4 7% 35%	2301
	21st to end	Day	10% 5% 3 6% 7% 3 6% 7% 7% 10% 36%	2531
June	1st to 10th	Day	13% 5% 2 5% 5% 4 5% 5% 6% 9% 41%	2358
	11th to 20th	Day	9% 5% 2 5% 6% 4 5% 5% 6% 9% 42%	2520
	21st to end	Day	10% 5% 3 5% 5% 3 6% 6% 7% 10% 39%	2520
July	1st to 10th	Day	10% 6% 3 6% 6% 3 6% 6% 7% 9% 37%	2520
	11th to 20th	Day	9% 5% 2 5% 5% 4 6% 6% 7% 9% 42%	2451
	21st to end	Day	10% 4 2 4 5% 4 6% 6% 7% 9% 42%	2547
August	1st to 10th	Day	8% 4 2 5% 5% 4 5% 6% 7% 10% 44%	2327
	11th to 20th	Day	10% 6% 2 5% 7% 3 4 7% 7% 10% 39%	2303
	21st to end	Day	8% 6% 3 5% 5% 3 4 5% 6% 9% 47%	2407
September	1st to 10th	Day	13% 5% 2 4 4 3 5% 5% 5% 7% 48%	2049
	11th to 20th	Day	10% 5% 2 5% 4 3 4 4 6% 9% 48%	1980
	21st to end	Day	15% 5% 2 5% 4 3 4 4 4 6% 48%	1980
October	1st to 10th	Day	11% 5% 3 5% 6% 3 5% 5% 5% 6% 47%	1980
	11th to 20th	Day	16% 5% 2 6% 5% 2 4 4 5% 7% 44%	1823
	21st to end	Day	22% 8% 2 5% 5% 3 3 4 4 6% 37%	1841
November	1st to 10th	Day	9% 5% 3 6% 4 3 4 4 4 6% 53%	1672
	11th to 20th	Day	15% 9% 4 8% 6% 2 4 4 4 7% 38%	1710
	21st to end	Day	19% 10% 4 7% 5% 3 4 3 5% 6% 35%	1710
December	1st to 10th	Day	21% 13% 6% 9% 6% 4 5% 4 4 5% 24%	1710
	11th to 20th	Day	16% 15% 6% 8% 6% 3 4 3 4 6% 29%	2153
	21st to end	Day	22% 20% 6% 9% 6% 4 4 4 4 5% 16%	2955
January	1st to 10th	Night	18% 13% 6% 10% 7% 4 5% 5% 4 4 25%	2648
	11th to 20th	Night	20% 15% 5% 8% 6% 4 4 4 4 5% 23%	2534
	21st to end	Night	18% 14% 6% 9% 6% 3 5% 4 4 5% 27%	2599
February	1st to 10th	Night	23% 12% 4 8% 6% 3 4 4 4 5% 28%	2254
	11th to 20th	Night	17% 10% 5% 8% 7% 3 5% 5% 4 7% 30%	2098
	21st to end	Night	22% 13% 5% 7% 5% 3 4 3 4 5% 29%	1776
March	1st to 10th	Night	18% 7% 3 6% 6% 3 5% 4 4 5% 38%	2147
	11th to 20th	Night	17% 9% 2 6% 5% 4 4 4 5% 7% 37%	1980
	21st to end	Night	20% 8% 4 6% 5% 3 3 5% 4 6% 34%	2178
April	1st to 10th	Night	14% 7% 3 6% 5% 3 3 6% 5% 7% 40%	1852
	11th to 20th	Night	15% 7% 2 5% 5% 3 5% 5% 5% 7% 41%	1719
	21st to end	Night	17% 6% 3 6% 6% 3 5% 5% 5% 7% 38%	1620
May	1st to 10th	Night	20% 7% 4 5% 6% 3 5% 4 6% 7% 32%	1620
	11th to 20th	Night	16% 7% 3 5% 5% 3 4 4 6% 8% 38%	1592
	21st to end	Night	7% 4 3 5% 5% 3 5% 6% 8% 11% 43%	1744
June	1st to 10th	Night	9% 4 3 5% 5% 3 6% 3 4 9% 49%	1598
	11th to 20th	Night	10% 3 2 4 4 3 5% 5% 7% 10% 46%	1440
	21st to end	Night	6% 4 2 5% 5% 3 6% 6% 8% 10% 46%	1440
July	1st to 10th	Night	11% 5% 3 4 5% 3 4 4 5% 9% 47%	1440
	11th to 20th	Night	7% 4 2 5% 5% 3 5% 5% 6% 9% 50%	1506
	21st to end	Night	9% 5% 2 5% 4 3 3 5% 6% 9% 48%	1771
August	1st to 10th	Night	7% 3 2 5% 6% 4 5% 5% 6% 8% 48%	1611
	11th to 20th	Night	7% 5% 2 5% 5% 3 5% 5% 6% 9% 48%	1598
	21st to end	Night	6% 3 2 4 4 3 4 5% 6% 9% 53%	1946
September	1st to 10th	Night	13% 5% 2 4 4 2 4 4 5% 7% 49%	1891
	11th to 20th	Night	9% 4 1 4 4 2 4 4 5% 8% 55%	1980
	21st to end	Night	13% 5% 2 5% 4 2 4 4 4 6% 51%	1980
October	1st to 10th	Night	9% 4 2 4 5% 3 4 4 4 7% 54%	1980
	11th to 20th	Night	15% 6% 3 6% 5% 3 4 3 5% 7% 42%	2136
	21st to end	Night	19% 8% 3 6% 5% 3 4 4 5% 6% 39%	2511
November	1st to 10th	Night	13% 7% 3 5% 4 3 4 3 5% 6% 47%	2406
	11th to 20th	Night	17% 7% 3 6% 5% 3 4 4 4 7% 40%	2470
	21st to end	Night	20% 10% 5% 5% 6% 3 4 4 5% 7% 31%	2470
December	1st to 10th	Night	21% 11% 5% 8% 5% 3 4 4 5% 5% 29%	2470
	11th to 20th	Night	19% 11% 7% 7% 5% 2 4 4 5% 6% 29%	3042
	21st to end	Night	23% 17% 6% 9% 7% 4 5% 4 4 5% 18%	4701

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% 3 9% 17% 12%	1518
	11th to 20th	Day	64% 2 11% 16% 7%	1638
	21st to end	Day	61% 2 11% 19% 5% 1	1791
February	1st to 10th	Day	62% 3 10% 16% 9% 1	1704
	11th to 20th	Day	60% 2 9% 20% 9% 1	1758
	21st to end	Day	58% 2 9% 21% 9% 2	1480
March	1st to 10th	Day	53% 2 9% 25% 10% 1	1813
	11th to 20th	Day	53% 3 11% 20% 11% 1	1980
	21st to end	Day	57% 3 11% 20% 8% 1	2178
April	1st to 10th	Day	48% 3 11% 24% 13% 1	2124
	11th to 20th	Day	47% 2 11% 22% 15% 3	2190
	21st to end	Day	51% 2 9% 23% 12% 3	2340
May	1st to 10th	Day	52% 3 11% 22% 10% 1	2340
	11th to 20th	Day	51% 4 13% 19% 13% 1	2305
	21st to end	Day	41% 5% 17% 23% 12% 2	2531
June	1st to 10th	Day	41% 4 11% 26% 17% 2	2358
	11th to 20th	Day	38% 4 14% 24% 18% 2	2520
	21st to end	Day	39% 5% 14% 23% 16% 4	2520
July	1st to 10th	Day	43% 4 13% 21% 17% 2	2451
	11th to 20th	Day	37% 5% 12% 28% 17% 2	2376
	21st to end	Day	37% 5% 15% 25% 14% 4	2405
August	1st to 10th	Day	35% 4 15% 30% 14% 2	2314
	11th to 20th	Day	39% 4 12% 28% 15% 1	2303
	21st to end	Day	34% 3 13% 25% 18% 5%	2407
September	1st to 10th	Day	37% 2 11% 26% 18% 5%	2049
	11th to 20th	Day	34% 2 11% 28% 22% 2	1980
	21st to end	Day	38% 3 9% 25% 23% 2	1980
October	1st to 10th	Day	38% 4 9% 26% 21% 2	1980
	11th to 20th	Day	40% 2 9% 26% 20% 3	1823
	21st to end	Day	49% 2 11% 22% 14% 2	1841
November	1st to 10th	Day	35% 3 9% 30% 21% 3	1672
	11th to 20th	Day	48% 2 8% 23% 16% 3	1710
	21st to end	Day	53% 2 9% 24% 12% 1	1710
December	1st to 10th	Day	65% 2 8% 18% 6%	1710
	11th to 20th	Day	59% 2 8% 21% 9%	2150
	21st to end	Day	73% 2 8% 10% 7%	2955
January	1st to 10th	Night	64% 3 6% 17% 10%	2648
	11th to 20th	Night	65% 2 10% 17% 6% 1	2534
	21st to end	Night	60% 3 8% 20% 8% 1	2599
February	1st to 10th	Night	62% 2 10% 19% 7% 1	2254
	11th to 20th	Night	55% 3 9% 21% 12% 1	2099
	21st to end	Night	59% 2 10% 18% 10% 2	1776
March	1st to 10th	Night	49% 3 8% 23% 15% 2	2147
	11th to 20th	Night	49% 2 12% 22% 12% 2	1980
	21st to end	Night	52% 3 10% 24% 9% 2	2178
April	1st to 10th	Night	43% 3 11% 28% 13% 2	1852
	11th to 20th	Night	43% 3 11% 19% 19% 5%	1719
	21st to end	Night	47% 3 11% 23% 13% 4	1620
May	1st to 10th	Night	52% 3 11% 21% 10% 3	1620
	11th to 20th	Night	45% 4 14% 20% 15% 2	1593
	21st to end	Night	34% 5% 18% 26% 14% 4	1745
June	1st to 10th	Night	35% 4 9% 29% 21% 2	1598
	11th to 20th	Night	32% 5% 16% 24% 18% 5%	1440
	21st to end	Night	31% 6% 18% 22% 18% 5%	1440
July	1st to 10th	Night	37% 3 14% 22% 19% 5%	1400
	11th to 20th	Night	31% 3 15% 29% 18% 3	1458
	21st to end	Night	33% 3 12% 33% 17% 2	1672
August	1st to 10th	Night	33% 4 14% 30% 17% 2	1600
	11th to 20th	Night	33% 5% 14% 31% 17% 1	1598
	21st to end	Night	28% 4 15% 25% 23% 5%	1946
September	1st to 10th	Night	34% 3 13% 26% 17% 7%	1891
	11th to 20th	Night	29% 3 9% 29% 26% 3	1980
	21st to end	Night	36% 3 8% 23% 27% 3	1980
October	1st to 10th	Night	32% 3 10% 29% 23% 3	1980
	11th to 20th	Night	44% 2 8% 24% 21% 2	2136
	21st to end	Night	48% 2 8% 23% 17% 3	2511
November	1st to 10th	Night	40% 2 9% 23% 23% 3	2406
	11th to 20th	Night	46% 2 7% 24% 18% 3	2470
	21st to end	Night	54% 2 11% 22% 10% 1	2470
December	1st to 10th	Night	58% 2 10% 21% 8% 1	2470
	11th to 20th	Night	57% 2 8% 23% 9% 1	3044
	21st to end	Night	72% 2 8% 14% 5%	4701

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	29% 14% 33% 18% 6%	270
	11th to 20th	Day	31% 18% 31% 16% 3	270
	21st to end	Day	31% 16% 30% 19% 4	267
February	1st to 10th	Day	32% 20% 30% 15% 3	240
	11th to 20th	Day	30% 22% 32% 15% 2	240
	21st to end	Day	30% 16% 42% 10% 2 1	198
March	1st to 10th	Day	25% 20% 38% 15% 2	253
	11th to 20th	Day	26% 10% 35% 21% 8% 1	420
	21st to end	Day	30% 11% 31% 20% 8%	462
April	1st to 10th	Day	21% 14% 29% 25% 10% 2	420
	11th to 20th	Day	22% 16% 23% 22% 13% 5%	412
	21st to end	Day	25% 10% 32% 20% 10% 3	420
May	1st to 10th	Day	26% 9% 31% 20% 10% 4	423
	11th to 20th	Day	23% 6% 24% 25% 15% 7%	447
	21st to end	Day	13% 4 20% 30% 19% 14%	485
June	1st to 10th	Day	15% 4 17% 30% 24% 11%	468
	11th to 20th	Day	11% 3 22% 31% 24% 9%	630
	21st to end	Day	12% 4 21% 31% 23% 9%	630
July	1st to 10th	Day	14% 1 12% 28% 24% 21%	621
	11th to 20th	Day	13% 2 17% 27% 27% 14%	549
	21st to end	Day	13% 2 14% 26% 30% 16%	488
August	1st to 10th	Day	12% 1 12% 25% 30% 20%	446
	11th to 20th	Day	15% 1 14% 29% 27% 14%	439
	21st to end	Day	11% 2 12% 28% 30% 17%	495
September	1st to 10th	Day	13% 2 13% 26% 34% 12%	450
	11th to 20th	Day	11% 2 12% 28% 33% 15%	450
	21st to end	Day	17% 7% 18% 25% 21% 12%	450
October	1st to 10th	Day	11% 5% 22% 34% 19% 9%	450
	11th to 20th	Day	17% 11% 30% 26% 14% 3	450
	21st to end	Day	30% 8% 35% 21% 6% 1	356
November	1st to 10th	Day	11% 12% 36% 24% 12% 4	270
	11th to 20th	Day	23% 14% 31% 20% 10% 3	270
	21st to end	Day	26% 9% 38% 22% 5%	270
December	1st to 10th	Day	24% 13% 38% 19% 6% 1	270
	11th to 20th	Day	26% 15% 36% 16% 6% 1	270
	21st to end	Day	32% 12% 34% 18% 4 1	297
January	1st to 10th	Night	24% 13% 32% 25% 6% 1	950
	11th to 20th	Night	31% 11% 31% 23% 3	824
	21st to end	Night	23% 12% 33% 29% 4	800
February	1st to 10th	Night	31% 9% 29% 28% 3	720
	11th to 20th	Night	24% 14% 34% 25% 3	703
	21st to end	Night	29% 10% 33% 26% 2	592
March	1st to 10th	Night	22% 10% 35% 26% 7% 1	720
	11th to 20th	Night	23% 9% 33% 27% 7% 1	720
	21st to end	Night	24% 8% 28% 31% 8%	792
April	1st to 10th	Night	19% 9% 32% 31% 9% 1	592
	11th to 20th	Night	20% 7% 31% 29% 12% 1	533
	21st to end	Night	19% 5% 34% 32% 9% 1	540
May	1st to 10th	Night	25% 4 28% 29% 13% 1	540
	11th to 20th	Night	20% 2 21% 36% 19% 3	531
	21st to end	Night	10% 2 18% 38% 30% 3	584
June	1st to 10th	Night	11% 2 15% 46% 25% 2	540
	11th to 20th	Night	11% 1 14% 44% 26% 3	540
	21st to end	Night	8% 1 17% 45% 26% 3	540
July	1st to 10th	Night	13% 1 8% 36% 32% 10%	525
	11th to 20th	Night	8% 1 10% 43% 32% 7%	522
	21st to end	Night	11% 2 8% 39% 36% 4	591
August	1st to 10th	Night	10% 1 7% 41% 39% 3	537
	11th to 20th	Night	9% 1 9% 42% 33% 5%	534
	21st to end	Night	7% 1 11% 34% 40% 6%	594
September	1st to 10th	Night	16% 1 10% 33% 35% 5%	631
	11th to 20th	Night	11% 2 12% 33% 37% 6%	720
	21st to end	Night	16% 3 18% 34% 27% 3	720
October	1st to 10th	Night	12% 3 21% 37% 23% 4	720
	11th to 20th	Night	20% 7% 25% 33% 14% 1	720
	21st to end	Night	24% 7% 29% 29% 11%	792
November	1st to 10th	Night	18% 6% 27% 32% 16% 1	740
	11th to 20th	Night	21% 10% 30% 28% 11% 1	760
	21st to end	Night	25% 7% 27% 32% 8% 1	760
December	1st to 10th	Night	28% 8% 32% 25% 6% 1	760
	11th to 20th	Night	25% 7% 33% 28% 6% 1	760
	21st to end	Night	31% 11% 29% 25% 4	940

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