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 2024-12-02.

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	16% 7% 2 6% 4 4 5% 4 6% 7% 38%	101605
	Night	17% 7% 2 6% 4 4 4 3 5% 7% 40%	98036
Transparency	Day	43% 7% 13% 22% 13% 2	105124
	Night	42% 7% 13% 23% 14% 2	102593
Seeing	Day	22% 15% 29% 21% 10% 3	14982
	Night	20% 13% 30% 27% 9% 1	24144

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	14% 8% 3 5% 4 4 5% 3 5% 7% 44%	2517
	11th to 20th	Day	14% 10% 4 10% 6% 5% 4 4 6% 5% 32%	2520
	21st to end	Day	20% 12% 5% 8% 4 4 4 3 5% 5% 31%	3000
February	1st to 10th	Day	15% 10% 3 7% 6% 5% 6% 3 6% 6% 34%	1710
	11th to 20th	Day	13% 7% 3 6% 6% 5% 5% 3 5% 6% 40%	1819
	21st to end	Day	19% 10% 3 6% 6% 4 4 3 4 5% 37%	1570
March	1st to 10th	Day	25% 9% 3 6% 4 4 4 3 4 4 34%	3116
	11th to 20th	Day	9% 7% 2 7% 5% 5% 6% 5% 6% 8% 40%	3370
	21st to end	Day	21% 7% 2 5% 4 3 4 3 4 6% 40%	4120
April	1st to 10th	Day	18% 7% 2 7% 5% 5% 4 4 5% 6% 37%	2280
	11th to 20th	Day	17% 7% 3 7% 4 4 4 3 4 6% 40%	2254
	21st to end	Day	18% 7% 3 7% 4 4 5% 4 5% 6% 38%	2304
May	1st to 10th	Day	26% 8% 2 6% 4 4 4 3 5% 7% 31%	4165
	11th to 20th	Day	20% 8% 2 7% 5% 4 5% 3 6% 7% 31%	4398
	21st to end	Day	13% 5% 2 5% 4 4 5% 5% 7% 10% 42%	4837
June	1st to 10th	Day	16% 6% 2 5% 6% 5% 5% 5% 6% 9% 36%	2660
	11th to 20th	Day	14% 6% 2 7% 5% 5% 4 5% 8% 8% 36%	2660
	21st to end	Day	13% 6% 2 7% 5% 4 5% 5% 6% 9% 38%	2660
July	1st to 10th	Day	10% 6% 3 7% 6% 5% 7% 4 7% 9% 35%	4440
	11th to 20th	Day	10% 5% 2 6% 5% 4 6% 5% 7% 11% 38%	4440
	21st to end	Day	14% 7% 3 8% 5% 5% 5% 5% 6% 7% 35%	4814
August	1st to 10th	Day	20% 6% 3 7% 5% 6% 5% 4 6% 7% 32%	4231
	11th to 20th	Day	13% 6% 2 6% 4 4 5% 4 7% 9% 40%	3730
	21st to end	Day	13% 6% 2 4 3 3 4 3 5% 10% 46%	4180
September	1st to 10th	Day	15% 6% 2 6% 4 5% 4 4 4 6% 43%	2280
	11th to 20th	Day	14% 4 2 5% 3 3 4 3 5% 8% 49%	2214
	21st to end	Day	18% 6% 2 5% 4 5% 4 3 6% 5% 41%	2090
October	1st to 10th	Day	20% 7% 2 6% 4 4 3 3 5% 6% 40%	1955
	11th to 20th	Day	15% 6% 2 5% 3 5% 4 4 5% 8% 43%	1900
	21st to end	Day	22% 5% 2 5% 4 4 5% 4 5% 6% 36%	1943
November	1st to 10th	Day	13% 6% 2 5% 4 3 3 2 4 6% 51%	1761
	11th to 20th	Day	17% 7% 2 5% 3 3 4 4 7% 6% 44%	1800
	21st to end	Day	17% 8% 2 7% 4 4 5% 4 6% 6% 38%	1661
December	1st to 10th	Day	18% 7% 3 7% 5% 5% 4 4 6% 8% 33%	1528
	11th to 20th	Day	21% 7% 1 4 4 4 4 3 6% 7% 39%	1906
	21st to end	Day	18% 10% 4 9% 6% 5% 6% 4 6% 6% 26%	2772
January	1st to 10th	Night	16% 7% 2 6% 3 4 4 4 5% 6% 43%	4429
	11th to 20th	Night	14% 8% 3 9% 5% 4 5% 3 5% 6% 37%	4440
	21st to end	Night	22% 12% 2 6% 4 4 4 4 6% 6% 31%	4654
February	1st to 10th	Night	15% 9% 2 6% 4 4 5% 3 4 6% 40%	2470
	11th to 20th	Night	14% 8% 3 7% 5% 4 5% 4 6% 6% 39%	2246
	21st to end	Night	17% 9% 2 5% 5% 4 4 3 4 5% 41%	1884
March	1st to 10th	Night	24% 10% 3 6% 3 3 3 3 4 6% 35%	3724
	11th to 20th	Night	11% 7% 3 5% 5% 4 5% 4 7% 7% 41%	3585
	21st to end	Night	16% 10% 3 7% 4 4 3 3 5% 5% 40%	3512
April	1st to 10th	Night	19% 7% 3 6% 5% 5% 4 4 5% 7% 37%	1900
	11th to 20th	Night	18% 7% 2 7% 4 4 5% 3 5% 7% 39%	1875
	21st to end	Night	20% 6% 2 6% 4 3 3 3 4 6% 42%	1876
May	1st to 10th	Night	28% 8% 2 5% 3 3 4 3 6% 7% 31%	2802
	11th to 20th	Night	24% 9% 3 6% 4 3 3 3 5% 6% 33%	2495
	21st to end	Night	14% 6% 2 6% 4 4 4 4 5% 8% 42%	2738
June	1st to 10th	Night	16% 6% 2 6% 4 4 4 3 6% 8% 42%	1520
	11th to 20th	Night	14% 5% 2 5% 4 4 5% 4 6% 10% 41%	1520
	21st to end	Night	12% 5% 2 5% 3 4 5% 3 7% 11% 45%	1520
July	1st to 10th	Night	11% 6% 2 6% 5% 4 5% 4 7% 9% 39%	2520
	11th to 20th	Night	12% 5% 2 6% 4 5% 5% 4 6% 10% 41%	2520
	21st to end	Night	17% 6% 2 6% 4 4 4 5% 6% 7% 37%	2739
August	1st to 10th	Night	20% 6% 3 7% 4 5% 5% 4 5% 8% 34%	2664
	11th to 20th	Night	15% 5% 3 7% 5% 4 5% 3 5% 6% 42%	3084
	21st to end	Night	12% 5% 2 4 3 4 4 3 5% 8% 51%	3476
September	1st to 10th	Night	15% 6% 2 5% 3 4 3 4 5% 6% 47%	1900
	11th to 20th	Night	14% 4 2 5% 2 4 3 2 4 7% 52%	1966
	21st to end	Night	18% 6% 3 4 3 4 3 3 5% 6% 45%	2090
October	1st to 10th	Night	21% 5% 2 6% 4 3 4 3 4 5% 42%	2222
	11th to 20th	Night	17% 5% 1 5% 3 3 3 3 5% 6% 48%	2280
	21st to end	Night	22% 7% 2 4 3 3 3 3 5% 7% 40%	2655
November	1st to 10th	Night	12% 6% 2 6% 4 3 4 3 5% 6% 48%	2537
	11th to 20th	Night	19% 6% 2 4 4 3 4 3 5% 6% 44%	2600
	21st to end	Night	16% 6% 2 5% 4 4 4 3 6% 7% 43%	2735
December	1st to 10th	Night	19% 7% 2 6% 4 4 4 4 5% 7% 38%	2686
	11th to 20th	Night	20% 8% 2 5% 4 4 5% 4 6% 6% 37%	3288
	21st to end	Night	21% 10% 3 6% 5% 4 4 3 5% 6% 33%	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	38% 7% 14% 32% 8% 2	2518
	11th to 20th	Day	50% 7% 12% 20% 9% 2	2520
	21st to end	Day	53% 8% 9% 20% 8% 1	3000
February	1st to 10th	Day	49% 6% 12% 19% 12% 1	1710
	11th to 20th	Day	43% 7% 11% 21% 16% 3	1828
	21st to end	Day	48% 5% 12% 22% 11% 2	1570
March	1st to 10th	Day	52% 7% 11% 20% 9% 2	3119
	11th to 20th	Day	35% 11% 16% 27% 10% 1	3370
	21st to end	Day	45% 5% 8% 16% 21% 4	4120
April	1st to 10th	Day	47% 6% 10% 21% 13% 3	2280
	11th to 20th	Day	44% 6% 12% 20% 15% 3	2254
	21st to end	Day	45% 7% 10% 20% 13% 4	2304
May	1st to 10th	Day	51% 8% 13% 16% 11% 2	4179
	11th to 20th	Day	50% 10% 13% 18% 8% 1	4402
	21st to end	Day	32% 10% 16% 25% 15% 2	4837
June	1st to 10th	Day	42% 10% 15% 19% 13% 1	2660
	11th to 20th	Day	42% 10% 15% 22% 10% 2	2660
	21st to end	Day	41% 8% 14% 23% 13% 1	2660
July	1st to 10th	Day	44% 8% 13% 20% 15% 1	4370
	11th to 20th	Day	39% 7% 18% 23% 13% 1	4365
	21st to end	Day	47% 7% 13% 18% 14% 2	4661
August	1st to 10th	Day	50% 7% 15% 19% 9%	4217
	11th to 20th	Day	39% 7% 17% 27% 9%	3766
	21st to end	Day	36% 6% 12% 31% 14% 1	4180
September	1st to 10th	Day	41% 7% 11% 23% 16% 1	2280
	11th to 20th	Day	33% 7% 11% 24% 24% 2	2214
	21st to end	Day	42% 7% 11% 21% 17% 2	2090
October	1st to 10th	Day	41% 5% 7% 19% 24% 3	3241
	11th to 20th	Day	32% 6% 9% 28% 23% 2	3140
	21st to end	Day	31% 5% 17% 26% 18% 4	3181
November	1st to 10th	Day	36% 5% 14% 25% 18% 3	1761
	11th to 20th	Day	40% 6% 11% 23% 17% 3	1800
	21st to end	Day	43% 7% 14% 26% 9% 1	1661
December	1st to 10th	Day	48% 7% 16% 18% 11%	1528
	11th to 20th	Day	43% 7% 17% 22% 9% 2	1906
	21st to end	Day	53% 10% 13% 17% 6%	2772
January	1st to 10th	Night	40% 7% 12% 27% 11% 3	4429
	11th to 20th	Night	46% 7% 14% 22% 10% 2	4440
	21st to end	Night	51% 7% 12% 19% 9% 1	4654
February	1st to 10th	Night	45% 6% 15% 21% 12% 1	2470
	11th to 20th	Night	44% 6% 11% 19% 15% 3	2248
	21st to end	Night	45% 5% 9% 23% 14% 3	1884
March	1st to 10th	Night	50% 7% 12% 19% 11% 2	3734
	11th to 20th	Night	37% 9% 17% 24% 11% 1	3586
	21st to end	Night	45% 7% 8% 17% 19% 4	3512
April	1st to 10th	Night	47% 6% 12% 19% 13% 3	1900
	11th to 20th	Night	44% 8% 11% 19% 18% 1	1875
	21st to end	Night	42% 8% 9% 21% 16% 4	1876
May	1st to 10th	Night	51% 7% 11% 20% 10% 1	2808
	11th to 20th	Night	50% 9% 14% 16% 10% 1	2496
	21st to end	Night	36% 10% 16% 24% 11% 2	2739
June	1st to 10th	Night	40% 8% 12% 23% 17% 1	1520
	11th to 20th	Night	38% 9% 17% 26% 10%	1520
	21st to end	Night	33% 10% 16% 26% 15% 1	1520
July	1st to 10th	Night	40% 7% 17% 19% 14% 2	2480
	11th to 20th	Night	40% 7% 15% 25% 13% 1	2472
	21st to end	Night	43% 7% 15% 17% 16% 2	2651
August	1st to 10th	Night	49% 7% 17% 18% 9% 1	2654
	11th to 20th	Night	43% 6% 14% 27% 9%	3114
	21st to end	Night	33% 6% 12% 33% 15% 1	3476
September	1st to 10th	Night	37% 7% 13% 25% 17% 1	1900
	11th to 20th	Night	32% 5% 11% 25% 25% 2	1966
	21st to end	Night	39% 6% 10% 22% 21% 1	2090
October	1st to 10th	Night	43% 5% 10% 22% 19% 1	3703
	11th to 20th	Night	28% 5% 10% 29% 25% 3	3779
	21st to end	Night	33% 5% 15% 29% 17% 1	4367
November	1st to 10th	Night	37% 6% 12% 22% 21% 2	2537
	11th to 20th	Night	41% 4 11% 22% 17% 4	2600
	21st to end	Night	40% 6% 16% 28% 10% 1	2735
December	1st to 10th	Night	45% 7% 14% 23% 11% 1	2686
	11th to 20th	Night	45% 7% 14% 19% 13% 2	3288
	21st to end	Night	50% 8% 14% 20% 8%	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	30% 20% 31% 16% 4	180
	11th to 20th	Day	36% 24% 27% 10% 2 1	180
	21st to end	Day	24% 25% 33% 14% 3 2	263
February	1st to 10th	Day	32% 25% 32% 10% 1	270
	11th to 20th	Day	29% 26% 34% 10% 1	427
	21st to end	Day	31% 21% 33% 12% 3	382
March	1st to 10th	Day	27% 21% 32% 16% 5%	460
	11th to 20th	Day	27% 25% 28% 16% 3 1	460
	21st to end	Day	31% 19% 30% 13% 5% 2	506
April	1st to 10th	Day	31% 21% 27% 13% 6% 1	460
	11th to 20th	Day	26% 24% 29% 12% 7% 2	452
	21st to end	Day	29% 18% 30% 15% 6% 1	460
May	1st to 10th	Day	34% 17% 27% 14% 6% 2	463
	11th to 20th	Day	20% 16% 35% 19% 8% 2	487
	21st to end	Day	19% 9% 29% 27% 13% 2	529
June	1st to 10th	Day	20% 12% 31% 23% 12% 1	490
	11th to 20th	Day	15% 13% 29% 28% 14% 1	490
	21st to end	Day	17% 12% 30% 28% 11% 2	490
July	1st to 10th	Day	13% 9% 29% 28% 16% 5%	485
	11th to 20th	Day	11% 5% 30% 31% 19% 4	484
	21st to end	Day	14% 7% 31% 33% 11% 3	532
August	1st to 10th	Day	12% 7% 28% 32% 15% 6%	486
	11th to 20th	Day	15% 6% 28% 29% 15% 6%	479
	21st to end	Day	13% 9% 27% 28% 16% 7%	539
September	1st to 10th	Day	19% 10% 23% 24% 16% 8%	490
	11th to 20th	Day	14% 8% 29% 19% 17% 13%	490
	21st to end	Day	23% 9% 26% 26% 11% 5%	490
October	1st to 10th	Day	26% 12% 22% 23% 13% 5%	490
	11th to 20th	Day	16% 16% 32% 21% 12% 2	490
	21st to end	Day	26% 10% 34% 18% 10% 1	462
November	1st to 10th	Day	19% 16% 30% 24% 9% 3	395
	11th to 20th	Day	24% 22% 28% 21% 6% 1	400
	21st to end	Day	26% 19% 31% 18% 5% 1	261
December	1st to 10th	Day	25% 26% 32% 11% 5% 1	182
	11th to 20th	Day	36% 17% 31% 15% 2	180
	21st to end	Day	24% 25% 34% 13% 4 1	198
January	1st to 10th	Night	21% 18% 39% 20% 3	760
	11th to 20th	Night	24% 17% 33% 23% 3	760
	21st to end	Night	19% 19% 37% 21% 3	836
February	1st to 10th	Night	22% 17% 37% 21% 1	760
	11th to 20th	Night	23% 21% 39% 16% 1	743
	21st to end	Night	25% 18% 36% 18% 3	628
March	1st to 10th	Night	24% 19% 33% 20% 4	760
	11th to 20th	Night	22% 23% 32% 20% 3	760
	21st to end	Night	21% 20% 34% 19% 5%	836
April	1st to 10th	Night	24% 18% 34% 20% 4	760
	11th to 20th	Night	23% 15% 32% 23% 5%	751
	21st to end	Night	24% 15% 29% 26% 6% 1	736
May	1st to 10th	Night	26% 13% 31% 24% 6%	551
	11th to 20th	Night	22% 10% 32% 30% 6%	374
	21st to end	Night	14% 8% 23% 41% 13% 1	411
June	1st to 10th	Night	16% 5% 28% 37% 13%	380
	11th to 20th	Night	13% 7% 29% 36% 15%	380
	21st to end	Night	12% 4 25% 45% 13% 1	380
July	1st to 10th	Night	14% 3 20% 42% 20% 1	370
	11th to 20th	Night	13% 2 21% 43% 19% 1	368
	21st to end	Night	12% 5% 22% 44% 17% 1	416
August	1st to 10th	Night	11% 2 22% 44% 19% 2	471
	11th to 20th	Night	14% 3 18% 41% 22% 2	737
	21st to end	Night	15% 5% 18% 37% 23% 2	836
September	1st to 10th	Night	16% 6% 23% 36% 18% 2	760
	11th to 20th	Night	16% 6% 23% 29% 22% 4	760
	21st to end	Night	20% 5% 23% 33% 17% 2	760
October	1st to 10th	Night	22% 10% 24% 25% 16% 2	760
	11th to 20th	Night	19% 11% 29% 31% 10%	760
	21st to end	Night	26% 11% 32% 23% 8%	836
November	1st to 10th	Night	16% 12% 34% 28% 9% 1	780
	11th to 20th	Night	22% 17% 30% 24% 7% 1	800
	21st to end	Night	20% 16% 33% 24% 7%	800
December	1st to 10th	Night	25% 17% 31% 21% 5%	768
	11th to 20th	Night	23% 19% 31% 24% 3	760
	21st to end	Night	25% 16% 37% 19% 2	836

Page generated at 2024-11-29 10:43:05. Version ac07

Copyright © 2024 Attilla Danko.