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 2024-11-02.

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	15% 6% 2 6% 4 4 5% 4 6% 8% 40%	101227
	Night	15% 7% 2 6% 4 4 4 4 6% 7% 41%	97689
Transparency	Day	40% 6% 13% 24% 14% 2	101028
	Night	40% 6% 12% 24% 15% 3	97558
Seeing	Day	18% 11% 25% 24% 16% 6%	14920
	Night	17% 9% 29% 32% 12% 1	24415

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% 6% 2 5% 4 5% 5% 4 6% 6% 42%	2590
	11th to 20th	Day	14% 11% 3 7% 5% 4 4 4 5% 5% 37%	2840
	21st to end	Day	17% 10% 3 7% 5% 4 4 4 5% 6% 34%	3124
February	1st to 10th	Day	13% 9% 3 7% 5% 5% 5% 5% 6% 6% 38%	1710
	11th to 20th	Day	16% 7% 3 6% 5% 5% 4 3 5% 6% 39%	1686
	21st to end	Day	18% 7% 4 6% 6% 5% 4 2 4 6% 38%	1570
March	1st to 10th	Day	21% 7% 2 6% 5% 4 5% 4 5% 7% 34%	3405
	11th to 20th	Day	10% 6% 2 5% 4 5% 4 5% 6% 7% 47%	3480
	21st to end	Day	19% 8% 2 6% 5% 3 4 3 5% 6% 40%	3861
April	1st to 10th	Day	14% 6% 2 6% 5% 5% 5% 4 6% 8% 38%	2280
	11th to 20th	Day	14% 6% 1 5% 5% 3 5% 4 5% 7% 44%	2254
	21st to end	Day	18% 6% 2 6% 4 4 4 4 5% 7% 40%	2280
May	1st to 10th	Day	24% 7% 3 6% 4 4 5% 4 6% 8% 30%	4082
	11th to 20th	Day	24% 6% 2 6% 4 5% 5% 4 7% 8% 29%	4270
	21st to end	Day	11% 5% 2 5% 4 4 4 4 6% 9% 45%	4823
June	1st to 10th	Day	12% 5% 2 5% 5% 4 5% 5% 7% 9% 43%	2660
	11th to 20th	Day	12% 5% 1 5% 5% 5% 5% 6% 7% 9% 40%	2660
	21st to end	Day	9% 4 2 5% 4 5% 5% 4 7% 10% 46%	2660
July	1st to 10th	Day	5% 4 2 6% 5% 5% 7% 5% 8% 10% 43%	4440
	11th to 20th	Day	8% 5% 2 6% 4 5% 5% 5% 7% 11% 42%	4293
	21st to end	Day	10% 6% 3 8% 5% 6% 5% 5% 6% 8% 37%	4466
August	1st to 10th	Day	16% 6% 2 6% 5% 5% 6% 5% 7% 9% 34%	4104
	11th to 20th	Day	10% 5% 2 6% 5% 5% 5% 5% 7% 10% 42%	3922
	21st to end	Day	12% 5% 1 5% 4 3 5% 4 6% 8% 47%	4180
September	1st to 10th	Day	15% 6% 2 5% 4 4 4 3 5% 7% 46%	2280
	11th to 20th	Day	12% 4 2 5% 4 4 4 3 5% 9% 47%	2280
	21st to end	Day	21% 7% 2 6% 4 4 4 3 5% 7% 38%	1986
October	1st to 10th	Day	17% 6% 2 5% 3 4 4 3 4 7% 44%	1900
	11th to 20th	Day	17% 4 1 4 4 4 4 3 4 6% 49%	1900
	21st to end	Day	13% 5% 2 5% 4 3 4 4 5% 6% 48%	2090
November	1st to 10th	Day	12% 5% 2 4 4 3 3 3 5% 7% 51%	1780
	11th to 20th	Day	16% 5% 1 4 3 4 4 4 6% 7% 47%	1649
	21st to end	Day	15% 6% 2 6% 4 4 4 5% 5% 6% 43%	1520
December	1st to 10th	Day	16% 8% 3 5% 5% 4 5% 5% 6% 7% 35%	1520
	11th to 20th	Day	17% 5% 2 6% 5% 4 5% 3 6% 7% 40%	1910
	21st to end	Day	18% 6% 2 6% 5% 4 6% 4 7% 9% 33%	2772
January	1st to 10th	Night	13% 8% 2 6% 5% 4 5% 3 6% 7% 42%	4353
	11th to 20th	Night	19% 8% 2 5% 4 3 4 3 5% 6% 43%	4120
	21st to end	Night	20% 9% 3 6% 4 4 4 4 5% 6% 36%	4532
February	1st to 10th	Night	14% 7% 3 6% 4 4 4 4 6% 6% 41%	2470
	11th to 20th	Night	16% 8% 3 6% 4 4 4 4 5% 5% 40%	2379
	21st to end	Night	16% 9% 3 7% 5% 4 4 3 5% 6% 37%	1884
March	1st to 10th	Night	20% 8% 2 6% 4 4 4 3 5% 6% 38%	3435
	11th to 20th	Night	12% 5% 2 5% 4 4 4 4 5% 6% 49%	3480
	21st to end	Night	14% 9% 3 6% 4 3 3 2 4 5% 47%	3769
April	1st to 10th	Night	15% 7% 2 6% 5% 4 5% 5% 7% 6% 37%	1900
	11th to 20th	Night	13% 6% 2 6% 4 4 4 3 5% 8% 44%	1875
	21st to end	Night	17% 5% 2 5% 4 4 5% 4 6% 7% 42%	1900
May	1st to 10th	Night	25% 8% 3 7% 4 4 4 3 5% 9% 29%	2827
	11th to 20th	Night	25% 9% 3 7% 4 3 3 4 5% 6% 31%	2623
	21st to end	Night	11% 4 2 6% 5% 4 6% 6% 8% 10% 40%	2732
June	1st to 10th	Night	11% 5% 2 5% 3 4 3 4 6% 10% 46%	1520
	11th to 20th	Night	11% 5% 2 7% 5% 5% 5% 4 7% 9% 40%	1520
	21st to end	Night	9% 5% 2 6% 4 5% 5% 4 7% 10% 45%	1520
July	1st to 10th	Night	6% 5% 2 7% 6% 6% 6% 5% 7% 11% 39%	2520
	11th to 20th	Night	7% 6% 2 8% 5% 5% 7% 5% 8% 10% 37%	2663
	21st to end	Night	12% 7% 2 7% 4 5% 5% 4 7% 9% 38%	3087
August	1st to 10th	Night	17% 5% 3 7% 5% 5% 5% 4 8% 9% 33%	2825
	11th to 20th	Night	11% 6% 2 7% 5% 6% 5% 5% 6% 9% 39%	2873
	21st to end	Night	13% 4 2 5% 4 4 4 4 5% 8% 47%	3476
September	1st to 10th	Night	14% 5% 2 5% 4 4 4 3 6% 8% 45%	1900
	11th to 20th	Night	12% 5% 2 5% 3 3 3 3 5% 7% 52%	1900
	21st to end	Night	21% 6% 2 6% 4 4 4 4 4 6% 41%	2190
October	1st to 10th	Night	19% 6% 2 6% 4 4 3 4 4 6% 44%	2280
	11th to 20th	Night	14% 5% 2 4 3 3 4 3 5% 6% 51%	2280
	21st to end	Night	16% 5% 1 4 3 3 3 3 6% 6% 50%	2508
November	1st to 10th	Night	11% 6% 2 5% 4 3 3 3 4 6% 53%	2330
	11th to 20th	Night	14% 7% 2 5% 3 3 3 4 5% 7% 48%	2529
	21st to end	Night	13% 5% 2 5% 4 4 4 3 6% 8% 45%	2660
December	1st to 10th	Night	16% 8% 3 6% 5% 4 4 4 5% 6% 39%	2660
	11th to 20th	Night	17% 5% 2 6% 5% 4 5% 4 5% 6% 41%	3285
	21st to end	Night	17% 7% 2 5% 4 5% 5% 4 7% 10% 34%	4884

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	40% 5% 11% 29% 12% 3	2591
	11th to 20th	Day	47% 5% 10% 21% 13% 4	2840
	21st to end	Day	50% 4 12% 22% 10% 2	3124
February	1st to 10th	Day	45% 6% 13% 24% 10% 2	1710
	11th to 20th	Day	45% 5% 9% 24% 13% 2	1695
	21st to end	Day	48% 3 11% 20% 14% 4	1570
March	1st to 10th	Day	48% 6% 11% 21% 12% 2	3405
	11th to 20th	Day	33% 6% 10% 28% 18% 3	3480
	21st to end	Day	46% 4 11% 21% 15% 3	3861
April	1st to 10th	Day	41% 6% 13% 19% 17% 4	2280
	11th to 20th	Day	38% 5% 11% 22% 18% 5%	2254
	21st to end	Day	43% 5% 10% 22% 17% 3	2280
May	1st to 10th	Day	51% 6% 10% 21% 10% 1	4120
	11th to 20th	Day	49% 9% 13% 20% 8% 2	4274
	21st to end	Day	34% 8% 15% 26% 17% 2	4837
June	1st to 10th	Day	36% 7% 15% 25% 16% 1	2660
	11th to 20th	Day	37% 9% 16% 23% 14% 2	2660
	21st to end	Day	32% 7% 16% 27% 16% 2	2660
July	1st to 10th	Day	32% 10% 17% 24% 11% 5%	4370
	11th to 20th	Day	34% 8% 16% 29% 12% 1	4218
	21st to end	Day	43% 7% 10% 22% 17% 1	4324
August	1st to 10th	Day	44% 8% 15% 24% 8%	4091
	11th to 20th	Day	35% 8% 13% 29% 15% 1	3961
	21st to end	Day	34% 7% 14% 27% 17% 2	4180
September	1st to 10th	Day	39% 5% 12% 20% 21% 4	2280
	11th to 20th	Day	34% 6% 9% 27% 21% 3	2280
	21st to end	Day	46% 5% 9% 20% 19% 2	1986
October	1st to 10th	Day	39% 6% 11% 23% 19% 3	1900
	11th to 20th	Day	37% 5% 11% 25% 21% 3	1900
	21st to end	Day	36% 4 11% 26% 21% 2	2090
November	1st to 10th	Day	33% 4 13% 26% 20% 4	1780
	11th to 20th	Day	35% 4 13% 24% 20% 4	1649
	21st to end	Day	40% 4 13% 28% 14% 1	1520
December	1st to 10th	Day	47% 4 14% 23% 10% 1	1520
	11th to 20th	Day	41% 5% 13% 31% 8% 2	1906
	21st to end	Day	45% 6% 18% 21% 9%	2772
January	1st to 10th	Night	39% 6% 12% 27% 14% 3	4353
	11th to 20th	Night	42% 4 12% 26% 14% 2	4120
	21st to end	Night	47% 4 10% 26% 11% 1	4532
February	1st to 10th	Night	41% 6% 14% 25% 13% 1	2470
	11th to 20th	Night	44% 5% 10% 22% 16% 3	2381
	21st to end	Night	46% 4 12% 21% 12% 5%	1884
March	1st to 10th	Night	46% 5% 10% 26% 10% 2	3435
	11th to 20th	Night	34% 6% 10% 32% 16% 2	3480
	21st to end	Night	40% 4 9% 24% 19% 5%	3769
April	1st to 10th	Night	44% 5% 11% 20% 17% 4	1900
	11th to 20th	Night	37% 7% 11% 22% 18% 5%	1875
	21st to end	Night	39% 6% 11% 25% 15% 4	1900
May	1st to 10th	Night	53% 6% 10% 19% 10% 3	2854
	11th to 20th	Night	51% 8% 11% 19% 10% 1	2624
	21st to end	Night	34% 9% 18% 25% 11% 2	2739
June	1st to 10th	Night	34% 8% 12% 27% 17% 3	1520
	11th to 20th	Night	38% 9% 12% 25% 14% 2	1520
	21st to end	Night	33% 8% 14% 24% 18% 2	1520
July	1st to 10th	Night	38% 9% 18% 18% 12% 5%	2480
	11th to 20th	Night	38% 10% 16% 21% 14% 2	2615
	21st to end	Night	39% 9% 15% 19% 17% 1	2988
August	1st to 10th	Night	45% 7% 17% 22% 8% 1	2814
	11th to 20th	Night	39% 8% 11% 26% 14% 1	2900
	21st to end	Night	35% 6% 13% 29% 15% 2	3476
September	1st to 10th	Night	37% 6% 12% 20% 20% 5%	1900
	11th to 20th	Night	32% 4 11% 27% 22% 3	1900
	21st to end	Night	45% 6% 9% 19% 18% 3	2190
October	1st to 10th	Night	42% 5% 10% 22% 18% 2	2280
	11th to 20th	Night	34% 5% 9% 28% 21% 3	2280
	21st to end	Night	34% 5% 10% 28% 21% 2	2508
November	1st to 10th	Night	32% 3 10% 28% 21% 5%	2330
	11th to 20th	Night	36% 4 10% 24% 21% 5%	2529
	21st to end	Night	37% 5% 13% 25% 17% 3	2660
December	1st to 10th	Night	44% 5% 13% 25% 12% 1	2660
	11th to 20th	Night	42% 4 12% 23% 16% 3	3288
	21st to end	Night	43% 6% 19% 21% 10% 1	4884

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	23% 26% 29% 16% 4 1	202
	11th to 20th	Day	29% 27% 26% 15% 3	270
	21st to end	Day	22% 25% 33% 13% 5% 1	297
February	1st to 10th	Day	21% 21% 40% 14% 4	270
	11th to 20th	Day	31% 24% 34% 9% 2	293
	21st to end	Day	29% 16% 34% 18% 3	382
March	1st to 10th	Day	20% 23% 29% 23% 5%	460
	11th to 20th	Day	24% 20% 31% 18% 6% 1	460
	21st to end	Day	23% 16% 32% 22% 6% 1	506
April	1st to 10th	Day	20% 20% 28% 23% 7% 2	460
	11th to 20th	Day	17% 15% 33% 17% 14% 4	452
	21st to end	Day	25% 13% 28% 21% 11% 2	460
May	1st to 10th	Day	25% 12% 28% 21% 11% 4	463
	11th to 20th	Day	20% 12% 26% 22% 14% 5%	487
	21st to end	Day	16% 5% 23% 26% 23% 8%	529
June	1st to 10th	Day	16% 6% 26% 24% 19% 8%	490
	11th to 20th	Day	15% 6% 25% 28% 20% 6%	490
	21st to end	Day	11% 4 25% 30% 23% 6%	490
July	1st to 10th	Day	10% 2 16% 31% 27% 13%	485
	11th to 20th	Day	6% 3 17% 30% 32% 12%	484
	21st to end	Day	12% 3 16% 34% 26% 8%	532
August	1st to 10th	Day	11% 3 17% 27% 28% 13%	486
	11th to 20th	Day	11% 2 18% 34% 22% 13%	479
	21st to end	Day	10% 4 16% 31% 24% 15%	539
September	1st to 10th	Day	18% 7% 14% 23% 26% 12%	490
	11th to 20th	Day	13% 4 17% 29% 26% 12%	490
	21st to end	Day	28% 7% 21% 24% 15% 5%	490
October	1st to 10th	Day	21% 6% 19% 25% 21% 8%	490
	11th to 20th	Day	17% 11% 24% 30% 16% 2	490
	21st to end	Day	14% 12% 32% 27% 12% 3	539
November	1st to 10th	Day	16% 10% 29% 29% 14% 3	418
	11th to 20th	Day	19% 12% 31% 24% 13% 1	309
	21st to end	Day	19% 17% 35% 18% 9% 1	180
December	1st to 10th	Day	22% 21% 31% 20% 4 2	180
	11th to 20th	Day	22% 20% 28% 22% 7% 1	180
	21st to end	Day	22% 16% 33% 21% 8% 1	198
January	1st to 10th	Night	18% 14% 43% 22% 3	760
	11th to 20th	Night	22% 14% 34% 27% 3	760
	21st to end	Night	18% 14% 42% 25% 1	836
February	1st to 10th	Night	18% 15% 34% 30% 2	760
	11th to 20th	Night	24% 17% 38% 20% 1	743
	21st to end	Night	22% 18% 38% 19% 3	628
March	1st to 10th	Night	20% 15% 38% 24% 4	760
	11th to 20th	Night	23% 14% 34% 24% 5% 1	760
	21st to end	Night	18% 14% 39% 25% 4 1	836
April	1st to 10th	Night	18% 17% 35% 25% 5%	760
	11th to 20th	Night	14% 12% 35% 30% 8%	751
	21st to end	Night	20% 9% 34% 29% 8%	760
May	1st to 10th	Night	23% 7% 24% 34% 11% 1	584
	11th to 20th	Night	22% 5% 25% 35% 13%	450
	21st to end	Night	14% 2 20% 43% 19% 1	411
June	1st to 10th	Night	12% 2 26% 36% 24% 1	380
	11th to 20th	Night	11% 3 20% 44% 20% 2	380
	21st to end	Night	9% 2 19% 50% 19%	380
July	1st to 10th	Night	12% 2 15% 41% 27% 3	370
	11th to 20th	Night	7% 1 12% 43% 33% 3	446
	21st to end	Night	10% 2 12% 46% 29% 3	624
August	1st to 10th	Night	13% 2 10% 42% 31% 2	567
	11th to 20th	Night	12% 3 13% 38% 31% 3	613
	21st to end	Night	12% 3 14% 39% 29% 3	836
September	1st to 10th	Night	16% 2 16% 37% 26% 3	760
	11th to 20th	Night	13% 3 16% 37% 29% 3	760
	21st to end	Night	23% 4 19% 33% 20% 2	760
October	1st to 10th	Night	21% 4 20% 31% 20% 3	760
	11th to 20th	Night	15% 9% 28% 34% 13% 1	760
	21st to end	Night	18% 7% 31% 32% 11%	836
November	1st to 10th	Night	12% 7% 32% 38% 9% 1	748
	11th to 20th	Night	18% 11% 34% 29% 8%	760
	21st to end	Night	15% 13% 34% 32% 7%	760
December	1st to 10th	Night	21% 10% 40% 22% 7%	760
	11th to 20th	Night	18% 9% 40% 29% 4	760
	21st to end	Night	20% 8% 37% 32% 3	836

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