Hamburg (NJ)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hamburg (NJ) 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	16% 8% 3 7% 5% 4 4 4 5% 7% 37%	101337
	Night	16% 8% 3 6% 4 4 4 3 5% 7% 39%	97647
Transparency	Day	47% 3 11% 23% 14% 2	101092
	Night	45% 3 11% 24% 15% 2	97512
Seeing	Day	24% 16% 30% 19% 8% 2	14923
	Night	22% 16% 30% 23% 8% 1	24075

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% 10% 3 6% 4 3 4 3 4 5% 44%	2517
	11th to 20th	Day	15% 11% 4 10% 5% 5% 5% 3 4 6% 33%	2520
	21st to end	Day	21% 11% 4 7% 4 4 4 3 4 5% 32%	3038
February	1st to 10th	Day	16% 9% 3 8% 5% 4 5% 4 5% 6% 35%	1710
	11th to 20th	Day	14% 9% 3 8% 5% 4 4 4 4 6% 40%	1816
	21st to end	Day	18% 10% 3 6% 5% 4 4 4 5% 5% 36%	1570
March	1st to 10th	Day	26% 10% 3 7% 4 3 3 2 4 5% 33%	3116
	11th to 20th	Day	10% 7% 3 7% 6% 5% 5% 4 5% 8% 40%	3400
	21st to end	Day	20% 8% 2 6% 4 4 3 3 4 6% 41%	4097
April	1st to 10th	Day	17% 9% 3 7% 5% 4 5% 3 5% 6% 37%	2280
	11th to 20th	Day	17% 8% 2 6% 5% 4 5% 3 4 7% 40%	2254
	21st to end	Day	17% 7% 2 6% 5% 5% 5% 4 5% 6% 37%	2280
May	1st to 10th	Day	27% 8% 3 6% 4 4 3 4 5% 6% 31%	4165
	11th to 20th	Day	21% 10% 3 8% 6% 4 5% 4 4 6% 29%	4398
	21st to end	Day	13% 5% 2 5% 4 4 4 4 7% 10% 42%	4837
June	1st to 10th	Day	14% 6% 2 6% 5% 6% 5% 5% 6% 8% 36%	2660
	11th to 20th	Day	15% 7% 3 6% 5% 5% 5% 5% 7% 9% 34%	2660
	21st to end	Day	12% 7% 3 7% 6% 4 5% 4 6% 9% 38%	2660
July	1st to 10th	Day	8% 7% 3 8% 7% 6% 6% 5% 7% 10% 33%	4440
	11th to 20th	Day	10% 7% 2 7% 5% 5% 5% 5% 7% 10% 37%	4440
	21st to end	Day	13% 9% 3 9% 6% 5% 5% 4 6% 7% 33%	4814
August	1st to 10th	Day	21% 6% 3 7% 5% 5% 5% 5% 7% 7% 29%	4188
	11th to 20th	Day	12% 6% 3 7% 4 5% 5% 4 6% 8% 40%	3730
	21st to end	Day	12% 6% 3 5% 3 4 4 3 6% 9% 45%	4180
September	1st to 10th	Day	15% 5% 2 6% 5% 4 4 3 5% 8% 42%	2280
	11th to 20th	Day	12% 5% 2 5% 4 4 4 3 5% 7% 49%	2222
	21st to end	Day	18% 7% 3 7% 4 4 4 4 5% 6% 39%	2090
October	1st to 10th	Day	18% 7% 2 7% 3 4 4 4 4 6% 39%	1943
	11th to 20th	Day	13% 7% 3 6% 3 5% 4 3 5% 7% 44%	1900
	21st to end	Day	21% 6% 2 6% 4 3 4 4 5% 7% 39%	1961
November	1st to 10th	Day	14% 7% 2 4 4 2 3 2 5% 5% 51%	1681
	11th to 20th	Day	17% 8% 2 5% 3 3 3 3 5% 7% 42%	1710
	21st to end	Day	16% 8% 2 6% 4 4 5% 4 5% 6% 39%	1582
December	1st to 10th	Day	18% 8% 4 9% 4 3 4 3 5% 7% 35%	1520
	11th to 20th	Day	20% 8% 2 6% 4 4 4 3 5% 6% 37%	1906
	21st to end	Day	18% 12% 4 10% 7% 5% 4 3 5% 6% 25%	2772
January	1st to 10th	Night	15% 9% 3 5% 4 4 4 3 6% 6% 41%	4429
	11th to 20th	Night	14% 9% 4 9% 5% 4 4 3 5% 6% 37%	4440
	21st to end	Night	22% 11% 3 7% 5% 4 3 3 5% 5% 32%	4614
February	1st to 10th	Night	15% 9% 3 6% 4 4 4 3 5% 6% 40%	2470
	11th to 20th	Night	16% 7% 3 7% 4 5% 5% 4 4 7% 38%	2248
	21st to end	Night	18% 8% 3 7% 4 4 3 3 5% 5% 39%	1884
March	1st to 10th	Night	22% 12% 3 6% 4 3 3 2 4 6% 35%	3724
	11th to 20th	Night	11% 8% 2 7% 4 4 4 3 6% 7% 43%	3556
	21st to end	Night	16% 9% 3 7% 4 3 4 4 4 6% 39%	3535
April	1st to 10th	Night	16% 9% 3 7% 6% 4 5% 4 5% 7% 34%	1900
	11th to 20th	Night	17% 7% 2 7% 5% 4 4 4 5% 7% 38%	1875
	21st to end	Night	19% 7% 2 5% 4 4 4 3 5% 6% 41%	1897
May	1st to 10th	Night	26% 9% 3 7% 3 3 3 4 5% 7% 30%	2803
	11th to 20th	Night	23% 9% 4 7% 3 4 4 3 5% 6% 32%	2495
	21st to end	Night	12% 8% 3 6% 4 4 4 4 6% 9% 40%	2738
June	1st to 10th	Night	16% 6% 2 5% 5% 4 4 3 5% 8% 43%	1520
	11th to 20th	Night	13% 6% 2 6% 5% 4 4 4 7% 8% 41%	1520
	21st to end	Night	12% 3 2 7% 4 4 4 4 7% 8% 45%	1520
July	1st to 10th	Night	9% 6% 2 7% 6% 5% 6% 4 7% 9% 39%	2520
	11th to 20th	Night	10% 7% 2 6% 4 5% 4 5% 8% 11% 38%	2520
	21st to end	Night	15% 8% 2 6% 4 4 5% 5% 6% 8% 36%	2739
August	1st to 10th	Night	20% 7% 2 8% 4 5% 5% 4 6% 7% 33%	2720
	11th to 20th	Night	14% 8% 3 6% 4 5% 4 4 5% 7% 40%	3083
	21st to end	Night	11% 5% 2 5% 4 4 4 4 5% 8% 50%	3476
September	1st to 10th	Night	14% 6% 2 6% 4 4 3 3 4 7% 47%	1900
	11th to 20th	Night	12% 6% 2 4 3 3 3 3 4 6% 53%	1957
	21st to end	Night	17% 6% 2 7% 4 3 4 3 5% 5% 45%	2090
October	1st to 10th	Night	19% 7% 2 6% 4 3 3 3 5% 6% 41%	2232
	11th to 20th	Night	16% 6% 2 6% 3 3 4 3 5% 5% 48%	2280
	21st to end	Night	19% 8% 2 5% 3 3 3 3 5% 6% 43%	2636
November	1st to 10th	Night	12% 7% 2 5% 3 3 4 3 5% 6% 49%	2431
	11th to 20th	Night	18% 8% 2 4 3 3 3 3 5% 6% 44%	2470
	21st to end	Night	14% 7% 3 5% 4 4 5% 4 5% 7% 43%	2593
December	1st to 10th	Night	18% 8% 3 5% 5% 4 5% 3 5% 7% 36%	2660
	11th to 20th	Night	18% 8% 2 6% 4 5% 5% 4 5% 6% 37%	3288
	21st to end	Night	20% 11% 4 8% 5% 4 4 3 5% 6% 32%	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	44% 2 8% 34% 10% 3	2518
	11th to 20th	Day	54% 2 9% 22% 11% 2	2520
	21st to end	Day	56% 2 8% 21% 11% 1	3038
February	1st to 10th	Day	49% 3 13% 21% 13% 1	1710
	11th to 20th	Day	46% 4 8% 23% 17% 3	1825
	21st to end	Day	50% 2 9% 23% 13% 3	1570
March	1st to 10th	Day	55% 2 8% 23% 10% 2	3119
	11th to 20th	Day	42% 2 10% 32% 12% 2	3400
	21st to end	Day	47% 1 7% 15% 24% 5%	4097
April	1st to 10th	Day	49% 2 7% 22% 15% 4	2280
	11th to 20th	Day	47% 3 9% 21% 18% 3	2254
	21st to end	Day	47% 3 8% 22% 16% 4	2280
May	1st to 10th	Day	56% 2 11% 17% 12% 2	4179
	11th to 20th	Day	58% 2 10% 20% 9% 1	4402
	21st to end	Day	39% 2 11% 28% 18% 2	4837
June	1st to 10th	Day	46% 5% 12% 22% 15% 1	2660
	11th to 20th	Day	46% 4 12% 25% 11% 2	2660
	21st to end	Day	42% 5% 13% 25% 15%	2660
July	1st to 10th	Day	44% 7% 12% 22% 13% 1	4370
	11th to 20th	Day	40% 5% 16% 24% 13% 1	4365
	21st to end	Day	49% 5% 11% 18% 15% 2	4661
August	1st to 10th	Day	52% 5% 13% 21% 9%	4174
	11th to 20th	Day	40% 4 14% 29% 11% 1	3766
	21st to end	Day	36% 4 10% 33% 16% 1	4180
September	1st to 10th	Day	41% 4 10% 24% 18% 2	2280
	11th to 20th	Day	37% 3 8% 24% 26% 3	2222
	21st to end	Day	46% 4 9% 20% 19% 3	2090
October	1st to 10th	Day	46% 3 8% 24% 16% 3	1943
	11th to 20th	Day	40% 2 10% 27% 19% 2	1900
	21st to end	Day	46% 3 10% 23% 16% 2	1961
November	1st to 10th	Day	37% 3 12% 25% 20% 4	1681
	11th to 20th	Day	42% 3 9% 24% 19% 3	1710
	21st to end	Day	43% 3 13% 28% 11% 2	1582
December	1st to 10th	Day	50% 3 14% 20% 12% 1	1520
	11th to 20th	Day	47% 2 14% 23% 11% 2	1906
	21st to end	Day	59% 3 9% 20% 9%	2772
January	1st to 10th	Night	43% 2 10% 31% 11% 3	4429
	11th to 20th	Night	49% 2 11% 24% 12% 2	4440
	21st to end	Night	54% 2 8% 23% 12% 1	4614
February	1st to 10th	Night	46% 3 12% 24% 13% 2	2470
	11th to 20th	Night	46% 3 8% 20% 18% 4	2250
	21st to end	Night	47% 2 6% 26% 15% 4	1884
March	1st to 10th	Night	54% 1 8% 23% 12% 2	3734
	11th to 20th	Night	40% 2 13% 27% 16% 2	3557
	21st to end	Night	46% 2 7% 17% 21% 6%	3535
April	1st to 10th	Night	50% 3 9% 21% 15% 3	1900
	11th to 20th	Night	47% 3 9% 20% 20% 1	1875
	21st to end	Night	45% 3 8% 24% 17% 4	1897
May	1st to 10th	Night	56% 3 9% 22% 10% 1	2809
	11th to 20th	Night	55% 4 13% 17% 10% 1	2496
	21st to end	Night	42% 3 14% 26% 13% 2	2739
June	1st to 10th	Night	41% 4 11% 25% 18% 1	1520
	11th to 20th	Night	40% 5% 14% 29% 10% 1	1520
	21st to end	Night	36% 5% 15% 28% 15% 1	1520
July	1st to 10th	Night	40% 7% 16% 21% 14% 2	2480
	11th to 20th	Night	40% 6% 16% 26% 12% 1	2472
	21st to end	Night	45% 5% 14% 17% 18% 2	2651
August	1st to 10th	Night	51% 6% 15% 19% 9% 1	2710
	11th to 20th	Night	43% 4 14% 28% 10%	3113
	21st to end	Night	32% 4 12% 34% 17% 1	3476
September	1st to 10th	Night	40% 4 9% 26% 19% 1	1900
	11th to 20th	Night	34% 3 10% 25% 26% 2	1957
	21st to end	Night	42% 3 8% 23% 22% 1	2090
October	1st to 10th	Night	45% 3 10% 24% 16% 2	2232
	11th to 20th	Night	38% 3 12% 29% 16% 2	2280
	21st to end	Night	43% 2 11% 26% 16% 1	2636
November	1st to 10th	Night	36% 3 11% 24% 22% 3	2431
	11th to 20th	Night	42% 2 9% 24% 19% 4	2470
	21st to end	Night	40% 3 13% 31% 12% 1	2593
December	1st to 10th	Night	48% 3 11% 23% 13% 1	2660
	11th to 20th	Night	47% 3 11% 21% 16% 3	3288
	21st to end	Night	54% 2 10% 22% 12%	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	34% 24% 28% 11% 2	180
	11th to 20th	Day	39% 26% 27% 7% 1	180
	21st to end	Day	29% 28% 32% 7% 4 1	275
February	1st to 10th	Day	36% 26% 30% 7% 1	270
	11th to 20th	Day	37% 27% 29% 7%	424
	21st to end	Day	36% 21% 31% 9% 3	382
March	1st to 10th	Day	31% 24% 29% 13% 3	460
	11th to 20th	Day	30% 25% 30% 11% 3 1	460
	21st to end	Day	34% 23% 28% 10% 4 1	506
April	1st to 10th	Day	33% 20% 32% 11% 5%	460
	11th to 20th	Day	29% 22% 30% 12% 6% 2	452
	21st to end	Day	30% 19% 33% 13% 4 2	460
May	1st to 10th	Day	35% 18% 26% 13% 5% 2	463
	11th to 20th	Day	23% 18% 31% 19% 8% 2	487
	21st to end	Day	20% 10% 31% 27% 10% 2	529
June	1st to 10th	Day	20% 15% 32% 21% 10% 2	490
	11th to 20th	Day	19% 14% 28% 26% 12% 1	490
	21st to end	Day	16% 13% 32% 27% 9% 2	490
July	1st to 10th	Day	16% 7% 29% 27% 16% 5%	485
	11th to 20th	Day	11% 5% 33% 31% 17% 2	484
	21st to end	Day	13% 12% 33% 28% 12% 2	532
August	1st to 10th	Day	15% 7% 29% 30% 13% 6%	486
	11th to 20th	Day	14% 6% 29% 30% 15% 6%	479
	21st to end	Day	15% 8% 29% 27% 14% 6%	539
September	1st to 10th	Day	20% 11% 28% 21% 14% 6%	490
	11th to 20th	Day	15% 9% 29% 23% 13% 11%	490
	21st to end	Day	25% 12% 28% 21% 11% 4	490
October	1st to 10th	Day	26% 12% 27% 20% 12% 4	490
	11th to 20th	Day	20% 20% 30% 21% 8% 2	490
	21st to end	Day	26% 18% 30% 17% 8% 1	471
November	1st to 10th	Day	24% 18% 27% 20% 9% 2	369
	11th to 20th	Day	29% 24% 27% 16% 4 1	370
	21st to end	Day	29% 24% 30% 13% 3	242
December	1st to 10th	Day	36% 24% 25% 11% 5%	180
	11th to 20th	Day	39% 22% 28% 6% 4	180
	21st to end	Day	29% 26% 32% 7% 5% 1	198
January	1st to 10th	Night	24% 27% 34% 13% 3	760
	11th to 20th	Night	29% 20% 30% 18% 3	760
	21st to end	Night	24% 25% 34% 15% 2	836
February	1st to 10th	Night	26% 22% 33% 17% 2	760
	11th to 20th	Night	27% 28% 34% 11% 1	743
	21st to end	Night	33% 21% 30% 13% 3	628
March	1st to 10th	Night	29% 22% 32% 15% 3	760
	11th to 20th	Night	27% 25% 30% 15% 3 1	760
	21st to end	Night	24% 24% 32% 14% 5%	836
April	1st to 10th	Night	26% 21% 32% 16% 4	760
	11th to 20th	Night	24% 20% 33% 19% 4	751
	21st to end	Night	25% 16% 32% 21% 6%	757
May	1st to 10th	Night	29% 14% 31% 21% 6%	552
	11th to 20th	Night	21% 13% 38% 21% 7%	374
	21st to end	Night	18% 7% 27% 36% 12% 1	411
June	1st to 10th	Night	19% 6% 30% 35% 10% 1	380
	11th to 20th	Night	13% 7% 31% 37% 11% 1	380
	21st to end	Night	13% 6% 26% 44% 11%	380
July	1st to 10th	Night	13% 5% 25% 38% 18% 2	370
	11th to 20th	Night	12% 4 27% 38% 18% 1	368
	21st to end	Night	13% 5% 24% 42% 15% 1	416
August	1st to 10th	Night	12% 2 24% 38% 21% 2	501
	11th to 20th	Night	15% 5% 21% 36% 21% 2	736
	21st to end	Night	15% 6% 22% 37% 18% 2	836
September	1st to 10th	Night	16% 7% 25% 34% 15% 2	760
	11th to 20th	Night	16% 7% 26% 28% 19% 4	760
	21st to end	Night	21% 8% 26% 29% 14% 2	760
October	1st to 10th	Night	22% 11% 25% 26% 13% 2	760
	11th to 20th	Night	20% 13% 32% 26% 8%	760
	21st to end	Night	26% 16% 32% 20% 7%	836
November	1st to 10th	Night	18% 17% 33% 22% 9% 1	748
	11th to 20th	Night	25% 18% 31% 19% 6% 1	760
	21st to end	Night	20% 21% 34% 19% 5% 1	760
December	1st to 10th	Night	28% 19% 32% 16% 5%	760
	11th to 20th	Night	25% 22% 33% 17% 3	760
	21st to end	Night	28% 21% 33% 15% 3	836

Page generated at 2024-10-30 13:19:22. Version ac07

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