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 2024-11-05.

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% 9% 3 7% 5% 4 4 4 5% 7% 36%	101342
	Night	15% 9% 3 7% 4 4 4 3 5% 7% 37%	97689
Transparency	Day	46% 3 11% 24% 15% 2	105024
	Night	46% 3 10% 24% 15% 2	102146
Seeing	Day	19% 8% 24% 24% 17% 8%	15375
	Night	19% 6% 24% 32% 16% 2	25084

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	17% 18% 6% 8% 4 4 4 4 4 6% 26%	2527
	11th to 20th	Day	16% 16% 6% 11% 5% 7% 5% 3 4 5% 21%	2720
	21st to end	Day	29% 18% 8% 7% 4 3 3 3 4 4 17%	3124
February	1st to 10th	Day	19% 13% 5% 9% 5% 4 3 4 5% 4 28%	1798
	11th to 20th	Day	17% 11% 4 12% 6% 4 3 3 4 6% 30%	1848
	21st to end	Day	19% 13% 4 10% 4 3 3 3 4 4 32%	1570
March	1st to 10th	Day	23% 16% 5% 9% 5% 4 3 3 4 4 26%	3147
	11th to 20th	Day	14% 9% 3 6% 4 4 4 3 6% 7% 41%	3480
	21st to end	Day	18% 9% 3 7% 5% 4 5% 4 5% 7% 33%	3815
April	1st to 10th	Day	14% 12% 3 7% 4 4 4 4 5% 7% 35%	2242
	11th to 20th	Day	17% 8% 2 6% 5% 4 4 3 5% 7% 39%	2314
	21st to end	Day	18% 8% 3 8% 5% 4 4 4 5% 7% 35%	2470
May	1st to 10th	Day	22% 9% 3 7% 4 5% 4 4 5% 7% 30%	4082
	11th to 20th	Day	21% 7% 3 6% 4 4 3 3 5% 7% 38%	4081
	21st to end	Day	12% 6% 2 8% 5% 5% 6% 5% 8% 10% 34%	4476
June	1st to 10th	Day	13% 6% 2 6% 5% 5% 5% 4 7% 9% 40%	2489
	11th to 20th	Day	9% 5% 2 6% 5% 5% 4 4 7% 9% 43%	2660
	21st to end	Day	10% 6% 2 5% 5% 5% 6% 5% 7% 10% 40%	2660
July	1st to 10th	Day	12% 6% 3 7% 5% 5% 5% 5% 7% 10% 36%	4440
	11th to 20th	Day	8% 4 2 6% 4 4 5% 4 7% 10% 46%	4315
	21st to end	Day	11% 6% 3 7% 5% 6% 6% 5% 7% 9% 34%	4466
August	1st to 10th	Day	8% 5% 2 6% 4 5% 5% 4 7% 10% 43%	4104
	11th to 20th	Day	9% 5% 2 6% 5% 4 5% 5% 7% 10% 42%	4044
	21st to end	Day	6% 5% 2 5% 4 4 4 3 6% 8% 54%	4225
September	1st to 10th	Day	12% 5% 2 4 4 4 5% 3 5% 7% 49%	2162
	11th to 20th	Day	9% 5% 2 6% 4 4 4 3 6% 9% 49%	2090
	21st to end	Day	16% 6% 2 6% 4 4 3 3 5% 6% 46%	2090
October	1st to 10th	Day	11% 5% 3 6% 4 4 5% 3 5% 6% 49%	2090
	11th to 20th	Day	15% 5% 2 7% 4 3 4 3 5% 7% 46%	1924
	21st to end	Day	21% 8% 2 6% 4 3 4 3 5% 6% 38%	1943
November	1st to 10th	Day	9% 6% 2 6% 4 4 4 3 4 6% 53%	1708
	11th to 20th	Day	14% 10% 4 8% 5% 3 4 3 5% 6% 37%	1710
	21st to end	Day	19% 11% 3 8% 5% 4 3 3 5% 6% 35%	1710
December	1st to 10th	Day	21% 14% 5% 10% 5% 5% 4 3 4 5% 24%	1710
	11th to 20th	Day	16% 15% 5% 9% 5% 4 4 3 5% 6% 29%	2153
	21st to end	Day	22% 20% 6% 10% 5% 5% 4 3 4 5% 16%	2955
January	1st to 10th	Night	17% 18% 7% 11% 5% 4 4 3 5% 5% 21%	4428
	11th to 20th	Night	15% 18% 6% 14% 6% 5% 4 3 4 5% 20%	4236
	21st to end	Night	27% 19% 6% 8% 4 4 3 2 3 4 20%	4532
February	1st to 10th	Night	22% 12% 3 9% 5% 4 4 3 4 5% 29%	2380
	11th to 20th	Night	16% 11% 4 9% 6% 4 5% 3 4 6% 31%	2218
	21st to end	Night	21% 13% 4 7% 5% 4 4 3 4 5% 30%	1884
March	1st to 10th	Night	22% 12% 3 6% 4 4 4 3 4 5% 33%	3706
	11th to 20th	Night	13% 8% 2 6% 4 4 4 3 5% 6% 44%	3480
	21st to end	Night	18% 8% 3 7% 4 4 3 3 4 6% 39%	3817
April	1st to 10th	Night	15% 9% 3 6% 4 3 4 4 5% 7% 39%	1954
	11th to 20th	Night	15% 7% 2 6% 4 4 4 4 5% 7% 41%	1815
	21st to end	Night	17% 6% 2 6% 5% 5% 4 4 6% 6% 38%	1710
May	1st to 10th	Night	23% 10% 4 7% 5% 5% 4 3 6% 6% 27%	2813
	11th to 20th	Night	18% 7% 2 5% 4 4 4 3 6% 8% 38%	2812
	21st to end	Night	9% 5% 2 5% 4 5% 4 4 7% 9% 45%	3079
June	1st to 10th	Night	9% 5% 3 6% 4 5% 4 3 5% 9% 48%	1686
	11th to 20th	Night	9% 4 2 4 4 4 5% 4 7% 10% 46%	1520
	21st to end	Night	6% 5% 2 5% 4 4 5% 5% 7% 10% 47%	1520
July	1st to 10th	Night	12% 5% 2 4 4 4 4 3 5% 8% 48%	2530
	11th to 20th	Night	6% 4 2 5% 4 4 4 4 7% 9% 53%	2648
	21st to end	Night	11% 6% 2 6% 5% 4 4 5% 7% 10% 38%	3087
August	1st to 10th	Night	9% 5% 2 7% 4 5% 5% 4 6% 8% 44%	2825
	11th to 20th	Night	7% 7% 2 7% 4 4 5% 4 5% 8% 47%	2785
	21st to end	Night	4 3 1 4 4 4 5% 4 7% 9% 56%	3428
September	1st to 10th	Night	12% 5% 2 5% 3 3 3 4 6% 7% 51%	1997
	11th to 20th	Night	9% 4 1 4 3 3 4 3 5% 8% 55%	2090
	21st to end	Night	15% 6% 2 6% 3 3 4 3 4 6% 49%	2090
October	1st to 10th	Night	9% 4 2 5% 4 4 3 3 5% 7% 55%	2090
	11th to 20th	Night	15% 7% 3 7% 4 4 4 2 5% 6% 45%	2255
	21st to end	Night	18% 8% 2 6% 4 4 4 3 5% 6% 40%	2651
November	1st to 10th	Night	13% 8% 2 5% 4 4 4 3 5% 6% 47%	2470
	11th to 20th	Night	17% 8% 3 6% 4 4 4 3 5% 6% 40%	2470
	21st to end	Night	20% 12% 4 6% 4 4 3 3 5% 7% 31%	2470
December	1st to 10th	Night	21% 12% 4 8% 5% 4 3 4 5% 5% 29%	2470
	11th to 20th	Night	19% 12% 7% 8% 5% 3 4 3 5% 6% 29%	3042
	21st to end	Night	22% 18% 6% 11% 6% 5% 4 3 4 4 17%	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	62% 2 9% 17% 11%	2528
	11th to 20th	Day	68% 1 10% 14% 6%	2720
	21st to end	Day	73% 1 9% 14% 3 1	3124
February	1st to 10th	Day	60% 2 9% 16% 10% 1	1798
	11th to 20th	Day	58% 2 9% 21% 10%	1858
	21st to end	Day	58% 2 9% 21% 9% 2	1570
March	1st to 10th	Day	64% 1 6% 20% 8% 1	3147
	11th to 20th	Day	44% 2 9% 27% 17% 1	3480
	21st to end	Day	52% 2 11% 24% 10% 1	3815
April	1st to 10th	Day	49% 3 10% 24% 13% 1	2242
	11th to 20th	Day	46% 2 11% 23% 14% 3	2314
	21st to end	Day	50% 2 10% 23% 12% 3	2470
May	1st to 10th	Day	55% 2 11% 22% 8% 1	4120
	11th to 20th	Day	48% 2 14% 25% 11% 1	4085
	21st to end	Day	43% 3 14% 22% 16% 2	4489
June	1st to 10th	Day	41% 4 11% 26% 17% 2	2489
	11th to 20th	Day	38% 4 14% 24% 19% 2	2660
	21st to end	Day	39% 5% 14% 22% 17% 4	2660
July	1st to 10th	Day	44% 4 11% 21% 18% 2	4371
	11th to 20th	Day	32% 5% 10% 33% 20% 1	4240
	21st to end	Day	45% 5% 14% 19% 14% 4	4324
August	1st to 10th	Day	35% 4 15% 32% 13% 1	4091
	11th to 20th	Day	36% 4 10% 33% 16% 1	4083
	21st to end	Day	29% 3 13% 31% 20% 3	4224
September	1st to 10th	Day	36% 2 10% 25% 20% 6%	2162
	11th to 20th	Day	34% 2 11% 28% 23% 3	2090
	21st to end	Day	40% 3 9% 24% 22% 2	2090
October	1st to 10th	Day	24% 3 8% 32% 31% 2	3480
	11th to 20th	Day	31% 2 8% 31% 26% 2	3177
	21st to end	Day	38% 1 10% 25% 23% 2	3180
November	1st to 10th	Day	35% 3 9% 30% 21% 3	1708
	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	67% 2 8% 14% 9%	4428
	11th to 20th	Night	68% 1 9% 16% 6%	4236
	21st to end	Night	70% 2 7% 15% 5%	4532
February	1st to 10th	Night	60% 2 9% 20% 8% 1	2380
	11th to 20th	Night	54% 3 9% 21% 13% 1	2219
	21st to end	Night	58% 2 10% 17% 10% 3	1884
March	1st to 10th	Night	55% 2 6% 24% 12% 1	3706
	11th to 20th	Night	42% 2 11% 28% 16% 2	3480
	21st to end	Night	48% 2 8% 29% 11% 1	3817
April	1st to 10th	Night	45% 3 10% 27% 13% 2	1954
	11th to 20th	Night	43% 3 10% 20% 19% 5%	1815
	21st to end	Night	46% 3 11% 23% 14% 3	1710
May	1st to 10th	Night	59% 2 8% 22% 7% 2	2840
	11th to 20th	Night	45% 3 13% 28% 10% 1	2813
	21st to end	Night	35% 3 14% 30% 14% 5%	3087
June	1st to 10th	Night	35% 3 9% 28% 22% 2	1686
	11th to 20th	Night	31% 5% 16% 24% 20% 4	1520
	21st to end	Night	31% 5% 18% 22% 18% 5%	1520
July	1st to 10th	Night	37% 3 10% 25% 18% 6%	2490
	11th to 20th	Night	28% 4 13% 33% 20% 2	2600
	21st to end	Night	40% 3 12% 26% 14% 4	2988
August	1st to 10th	Night	37% 4 14% 31% 12% 1	2814
	11th to 20th	Night	35% 4 11% 30% 18% 1	2812
	21st to end	Night	25% 4 15% 31% 22% 3	3428
September	1st to 10th	Night	34% 3 12% 26% 19% 7%	1997
	11th to 20th	Night	28% 3 8% 29% 27% 4	2090
	21st to end	Night	38% 3 8% 23% 26% 3	2090
October	1st to 10th	Night	22% 2 6% 32% 35% 3	3480
	11th to 20th	Night	30% 2 9% 27% 31% 2	3741
	21st to end	Night	35% 2 7% 24% 27% 4	4364
November	1st to 10th	Night	39% 2 9% 23% 23% 3	2470
	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% 32% 16% 3	270
	21st to end	Day	35% 15% 29% 17% 3	297
February	1st to 10th	Day	29% 19% 30% 18% 3	270
	11th to 20th	Day	27% 21% 33% 15% 3	270
	21st to end	Day	31% 15% 42% 9% 2	225
March	1st to 10th	Day	26% 19% 36% 15% 3	284
	11th to 20th	Day	26% 12% 33% 21% 7% 1	460
	21st to end	Day	30% 12% 31% 20% 7%	506
April	1st to 10th	Day	23% 14% 28% 23% 10% 2	460
	11th to 20th	Day	22% 17% 23% 21% 12% 4	452
	21st to end	Day	24% 10% 32% 21% 10% 2	460
May	1st to 10th	Day	25% 9% 31% 22% 10% 4	463
	11th to 20th	Day	24% 7% 22% 24% 15% 8%	487
	21st to end	Day	13% 5% 21% 31% 18% 13%	529
June	1st to 10th	Day	15% 4 19% 29% 23% 11%	509
	11th to 20th	Day	11% 3 22% 32% 24% 8%	680
	21st to end	Day	12% 4 23% 31% 22% 9%	680
July	1st to 10th	Day	14% 1 14% 28% 23% 19%	671
	11th to 20th	Day	12% 3 19% 27% 27% 13%	595
	21st to end	Day	13% 2 14% 28% 28% 15%	532
August	1st to 10th	Day	12% 2 13% 25% 30% 19%	486
	11th to 20th	Day	14% 2 15% 30% 25% 13%	479
	21st to end	Day	11% 2 11% 28% 31% 17%	539
September	1st to 10th	Day	12% 3 12% 27% 34% 11%	490
	11th to 20th	Day	10% 2 11% 29% 33% 14%	490
	21st to end	Day	19% 7% 18% 24% 20% 11%	490
October	1st to 10th	Day	11% 5% 21% 34% 20% 9%	490
	11th to 20th	Day	16% 11% 30% 25% 15% 4	490
	21st to end	Day	28% 8% 35% 21% 7% 1	392
November	1st to 10th	Day	11% 12% 37% 24% 12% 4	282
	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	25% 11% 32% 28% 4	836
February	1st to 10th	Night	29% 9% 30% 29% 3	760
	11th to 20th	Night	23% 14% 35% 25% 3	743
	21st to end	Night	29% 10% 33% 26% 2	628
March	1st to 10th	Night	23% 10% 34% 26% 7% 1	760
	11th to 20th	Night	22% 11% 33% 27% 7% 1	760
	21st to end	Night	24% 9% 29% 30% 8%	836
April	1st to 10th	Night	20% 9% 33% 30% 8%	624
	11th to 20th	Night	20% 7% 32% 28% 12% 1	563
	21st to end	Night	18% 5% 35% 32% 8% 1	570
May	1st to 10th	Night	25% 4 27% 29% 13% 1	570
	11th to 20th	Night	20% 2 20% 37% 19% 3	561
	21st to end	Night	10% 2 19% 38% 29% 3	617
June	1st to 10th	Night	11% 2 16% 45% 24% 2	570
	11th to 20th	Night	11% 1 14% 46% 25% 3	570
	21st to end	Night	8% 1 18% 45% 26% 3	570
July	1st to 10th	Night	12% 2 9% 37% 31% 9%	555
	11th to 20th	Night	8% 1 11% 42% 32% 7%	552
	21st to end	Night	12% 2 8% 39% 35% 4	624
August	1st to 10th	Night	11% 1 8% 40% 38% 3	567
	11th to 20th	Night	9% 1 10% 43% 32% 4	564
	21st to end	Night	7% 1 11% 34% 40% 7%	627
September	1st to 10th	Night	15% 2 11% 33% 34% 5%	667
	11th to 20th	Night	11% 2 11% 34% 36% 5%	760
	21st to end	Night	17% 3 17% 34% 25% 3	760
October	1st to 10th	Night	12% 3 21% 37% 24% 4	760
	11th to 20th	Night	19% 7% 25% 33% 15% 1	760
	21st to end	Night	22% 7% 30% 29% 11%	836
November	1st to 10th	Night	18% 6% 27% 33% 15% 1	760
	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

Page generated at 2024-11-03 02:11:18. Version ac07

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