New Bremen
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the New Bremen 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% 9% 4 7% 6% 3 5% 5% 5% 7% 34%	75033
	Night	15% 10% 4 7% 6% 3 4 4 5% 7% 36%	74902
Transparency	Day	48% 7% 12% 20% 12% 2	74746
	Night	49% 6% 11% 20% 13% 2	74710
Seeing	Day	18% 10% 26% 23% 15% 7%	14371
	Night	19% 9% 28% 28% 14% 2	24293

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% 14% 6% 12% 9% 4 6% 3 4 6% 19%	1517
	11th to 20th	Day	18% 16% 9% 11% 7% 4 5% 4 4 5% 18%	1539
	21st to end	Day	16% 16% 9% 10% 9% 4 4 3 5% 5% 19%	1791
February	1st to 10th	Day	19% 16% 7% 10% 7% 4 5% 3 4 4 20%	1676
	11th to 20th	Day	16% 11% 6% 14% 8% 4 5% 4 4 6% 22%	1748
	21st to end	Day	16% 15% 6% 8% 6% 3 5% 4 4 7% 26%	1480
March	1st to 10th	Day	19% 11% 5% 8% 7% 3 4 5% 3 6% 29%	1808
	11th to 20th	Day	17% 11% 5% 8% 6% 4 4 5% 5% 7% 29%	1980
	21st to end	Day	23% 11% 5% 8% 6% 3 4 3 5% 6% 26%	2178
April	1st to 10th	Day	15% 10% 5% 8% 7% 3 5% 4 5% 7% 32%	2132
	11th to 20th	Day	18% 8% 4 6% 5% 3 4 5% 5% 8% 34%	2204
	21st to end	Day	19% 9% 3 7% 6% 4 4 5% 5% 7% 31%	2340
May	1st to 10th	Day	19% 9% 3 7% 6% 4 5% 5% 5% 6% 32%	2340
	11th to 20th	Day	20% 7% 3 5% 5% 3 5% 5% 5% 7% 34%	2301
	21st to end	Day	9% 6% 3 6% 6% 4 6% 6% 7% 10% 37%	2531
June	1st to 10th	Day	13% 6% 2 5% 6% 3 6% 5% 6% 8% 40%	2440
	11th to 20th	Day	10% 5% 2 5% 6% 3 6% 6% 7% 10% 41%	2520
	21st to end	Day	10% 5% 3 6% 5% 3 6% 7% 8% 11% 38%	2520
July	1st to 10th	Day	11% 5% 2 6% 5% 3 5% 7% 7% 10% 40%	2520
	11th to 20th	Day	8% 4 2 4 5% 4 5% 6% 7% 10% 46%	2520
	21st to end	Day	9% 4 3 5% 6% 3 6% 5% 7% 10% 42%	2547
August	1st to 10th	Day	9% 4 2 5% 4 3 5% 6% 8% 10% 45%	2327
	11th to 20th	Day	9% 5% 2 5% 6% 4 5% 6% 8% 10% 40%	2303
	21st to end	Day	9% 4 2 5% 5% 3 5% 5% 6% 11% 44%	2433
September	1st to 10th	Day	12% 6% 2 4 6% 4 5% 4 5% 6% 46%	2057
	11th to 20th	Day	10% 5% 2 5% 5% 3 4 5% 7% 9% 44%	1980
	21st to end	Day	16% 6% 3 4 5% 3 3 3 4 7% 47%	1980
October	1st to 10th	Day	12% 6% 3 6% 5% 4 4 4 5% 7% 43%	1980
	11th to 20th	Day	15% 7% 2 5% 5% 3 4 5% 5% 7% 41%	1814
	21st to end	Day	20% 9% 3 7% 5% 3 4 5% 6% 6% 30%	1820
November	1st to 10th	Day	11% 7% 3 5% 4 3 3 4 5% 7% 49%	1672
	11th to 20th	Day	17% 12% 5% 7% 5% 3 4 4 4 5% 34%	1710
	21st to end	Day	18% 14% 5% 8% 5% 3 3 4 4 6% 30%	1710
December	1st to 10th	Day	18% 16% 7% 10% 7% 4 5% 4 4 4 21%	1710
	11th to 20th	Day	15% 15% 6% 11% 7% 3 5% 5% 5% 5% 23%	2122
	21st to end	Day	20% 21% 10% 12% 8% 3 5% 4 3 4 11%	2783
January	1st to 10th	Night	18% 13% 7% 11% 7% 4 5% 3 4 4 23%	2648
	11th to 20th	Night	18% 16% 7% 11% 8% 3 4 3 3 4 22%	2637
	21st to end	Night	17% 15% 7% 10% 7% 3 5% 5% 4 5% 22%	2599
February	1st to 10th	Night	22% 14% 6% 8% 7% 3 5% 4 3 5% 24%	2282
	11th to 20th	Night	14% 14% 5% 9% 8% 3 5% 4 5% 6% 28%	2098
	21st to end	Night	21% 12% 6% 9% 6% 3 4 3 4 5% 26%	1776
March	1st to 10th	Night	16% 10% 5% 7% 6% 4 4 4 4 5% 35%	2152
	11th to 20th	Night	14% 9% 4 6% 5% 3 4 5% 4 7% 38%	1980
	21st to end	Night	20% 10% 5% 6% 6% 3 4 4 4 6% 33%	2178
April	1st to 10th	Night	15% 8% 4 6% 5% 3 5% 5% 5% 8% 37%	1843
	11th to 20th	Night	16% 8% 3 6% 5% 3 5% 4 6% 8% 37%	1703
	21st to end	Night	19% 8% 4 7% 5% 3 4 3 6% 6% 36%	1620
May	1st to 10th	Night	19% 10% 4 6% 5% 3 5% 5% 6% 6% 30%	1620
	11th to 20th	Night	20% 7% 2 5% 6% 3 3 4 5% 8% 38%	1592
	21st to end	Night	8% 5% 2 4 5% 4 6% 5% 7% 12% 42%	1744
June	1st to 10th	Night	8% 6% 3 5% 5% 3 5% 5% 5% 8% 48%	1514
	11th to 20th	Night	9% 5% 2 5% 4 3 5% 6% 5% 9% 47%	1440
	21st to end	Night	9% 5% 2 5% 5% 3 4 5% 6% 10% 45%	1440
July	1st to 10th	Night	9% 4 2 5% 6% 4 5% 5% 5% 9% 45%	1440
	11th to 20th	Night	6% 4 2 4 5% 3 4 5% 6% 9% 51%	1440
	21st to end	Night	9% 3 3 5% 5% 3 5% 4 6% 9% 50%	1769
August	1st to 10th	Night	7% 4 2 5% 5% 3 6% 5% 7% 9% 48%	1611
	11th to 20th	Night	8% 4 3 4 5% 3 4 6% 7% 8% 48%	1598
	21st to end	Night	7% 4 2 5% 5% 4 4 5% 6% 8% 52%	1919
September	1st to 10th	Night	11% 5% 3 4 4 2 4 5% 5% 8% 49%	1884
	11th to 20th	Night	10% 6% 1 4 4 3 3 4 5% 7% 55%	1980
	21st to end	Night	11% 6% 2 5% 4 3 4 5% 5% 7% 49%	1980
October	1st to 10th	Night	11% 5% 2 5% 4 3 4 4 5% 7% 50%	1980
	11th to 20th	Night	17% 8% 3 6% 5% 3 4 4 4 7% 39%	2146
	21st to end	Night	20% 8% 2 6% 6% 3 4 5% 5% 6% 36%	2533
November	1st to 10th	Night	13% 9% 3 5% 4 2 4 3 5% 6% 46%	2406
	11th to 20th	Night	16% 11% 5% 7% 5% 3 4 4 5% 6% 36%	2470
	21st to end	Night	18% 13% 4 7% 6% 3 5% 5% 4 5% 28%	2470
December	1st to 10th	Night	19% 14% 6% 8% 7% 3 4 5% 4 6% 24%	2470
	11th to 20th	Night	18% 14% 7% 9% 6% 3 4 4 5% 5% 26%	3056
	21st to end	Night	23% 19% 8% 9% 7% 3 4 4 3 5% 15%	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	67% 5% 8% 14% 6%	1518
	11th to 20th	Day	69% 4 11% 10% 5%	1539
	21st to end	Day	68% 5% 9% 13% 5% 1	1791
February	1st to 10th	Day	68% 4 9% 11% 7% 1	1676
	11th to 20th	Day	63% 4 10% 15% 7% 1	1758
	21st to end	Day	59% 5% 11% 16% 8% 2	1480
March	1st to 10th	Day	55% 6% 12% 18% 8% 1	1808
	11th to 20th	Day	56% 6% 11% 16% 10% 1	1980
	21st to end	Day	59% 4 12% 19% 5% 1	2178
April	1st to 10th	Day	52% 6% 11% 18% 12% 1	2132
	11th to 20th	Day	48% 6% 12% 19% 13% 3	2204
	21st to end	Day	52% 6% 12% 18% 10% 2	2340
May	1st to 10th	Day	53% 6% 12% 17% 10% 1	2340
	11th to 20th	Day	50% 7% 12% 19% 11% 1	2305
	21st to end	Day	40% 11% 14% 23% 12% 1	2531
June	1st to 10th	Day	41% 7% 12% 24% 15% 2	2440
	11th to 20th	Day	37% 8% 13% 25% 16% 2	2520
	21st to end	Day	38% 9% 14% 21% 14% 4	2520
July	1st to 10th	Day	37% 9% 15% 20% 15% 3	2451
	11th to 20th	Day	31% 9% 15% 26% 18% 1	2445
	21st to end	Day	35% 8% 16% 24% 15% 2	2405
August	1st to 10th	Day	32% 9% 15% 28% 14% 2	2314
	11th to 20th	Day	36% 9% 13% 26% 13% 1	2303
	21st to end	Day	33% 8% 14% 24% 15% 5%	2433
September	1st to 10th	Day	37% 8% 12% 21% 19% 4	2057
	11th to 20th	Day	35% 8% 10% 24% 21% 2	1980
	21st to end	Day	39% 5% 10% 23% 21% 1	1980
October	1st to 10th	Day	40% 7% 10% 24% 18% 2	1980
	11th to 20th	Day	41% 6% 12% 22% 18% 2	1814
	21st to end	Day	52% 6% 11% 19% 10% 1	1820
November	1st to 10th	Day	36% 5% 13% 25% 19% 2	1672
	11th to 20th	Day	52% 5% 9% 20% 11% 3	1710
	21st to end	Day	57% 5% 10% 18% 9% 1	1710
December	1st to 10th	Day	66% 5% 10% 13% 5%	1710
	11th to 20th	Day	62% 5% 11% 16% 6%	2119
	21st to end	Day	79% 4 7% 6% 5%	2783
January	1st to 10th	Night	65% 5% 7% 14% 8%	2648
	11th to 20th	Night	67% 4 10% 14% 6%	2637
	21st to end	Night	65% 5% 9% 14% 7% 1	2599
February	1st to 10th	Night	64% 5% 10% 14% 6% 1	2282
	11th to 20th	Night	57% 5% 11% 15% 10% 2	2099
	21st to end	Night	61% 5% 9% 15% 9% 1	1776
March	1st to 10th	Night	53% 4 10% 20% 12% 1	2152
	11th to 20th	Night	46% 6% 12% 21% 12% 3	1980
	21st to end	Night	54% 4 8% 22% 10% 1	2178
April	1st to 10th	Night	45% 6% 12% 21% 14% 1	1843
	11th to 20th	Night	44% 8% 10% 18% 17% 3	1703
	21st to end	Night	48% 5% 11% 20% 12% 3	1620
May	1st to 10th	Night	52% 7% 10% 18% 9% 3	1620
	11th to 20th	Night	45% 6% 12% 20% 15% 2	1593
	21st to end	Night	33% 9% 15% 25% 13% 4	1745
June	1st to 10th	Night	33% 7% 12% 25% 21% 3	1514
	11th to 20th	Night	32% 8% 12% 27% 17% 4	1440
	21st to end	Night	33% 9% 15% 23% 17% 3	1440
July	1st to 10th	Night	36% 8% 13% 20% 18% 5%	1400
	11th to 20th	Night	29% 8% 14% 29% 18% 2	1392
	21st to end	Night	30% 7% 15% 27% 17% 4	1671
August	1st to 10th	Night	31% 9% 14% 28% 18% 1	1600
	11th to 20th	Night	32% 8% 13% 27% 20% 1	1598
	21st to end	Night	29% 9% 14% 20% 22% 5%	1919
September	1st to 10th	Night	34% 7% 13% 24% 17% 5%	1884
	11th to 20th	Night	30% 5% 9% 29% 25% 2	1980
	21st to end	Night	34% 7% 10% 23% 23% 3	1980
October	1st to 10th	Night	33% 6% 12% 25% 23% 2	1980
	11th to 20th	Night	46% 5% 8% 24% 17% 1	2146
	21st to end	Night	48% 5% 9% 21% 14% 2	2533
November	1st to 10th	Night	39% 4 11% 23% 20% 2	2406
	11th to 20th	Night	48% 5% 10% 20% 14% 3	2470
	21st to end	Night	57% 5% 10% 19% 8% 1	2470
December	1st to 10th	Night	60% 6% 10% 16% 7%	2470
	11th to 20th	Night	60% 5% 10% 17% 7% 1	3058
	21st to end	Night	73% 5% 9% 9% 4	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	24% 20% 31% 20% 4	270
	11th to 20th	Day	26% 16% 38% 14% 4 1	270
	21st to end	Day	31% 15% 30% 18% 6%	267
February	1st to 10th	Day	34% 16% 33% 15% 1	240
	11th to 20th	Day	26% 20% 38% 11% 5%	240
	21st to end	Day	23% 19% 45% 12% 1	198
March	1st to 10th	Day	25% 17% 39% 17% 2	248
	11th to 20th	Day	26% 11% 33% 22% 6% 1	420
	21st to end	Day	32% 14% 28% 19% 6%	462
April	1st to 10th	Day	19% 17% 30% 23% 10% 2	420
	11th to 20th	Day	21% 17% 27% 21% 10% 4	412
	21st to end	Day	24% 13% 32% 20% 9% 3	420
May	1st to 10th	Day	25% 9% 33% 20% 9% 3	423
	11th to 20th	Day	23% 8% 26% 24% 13% 7%	447
	21st to end	Day	12% 6% 25% 26% 20% 11%	485
June	1st to 10th	Day	14% 4 23% 33% 18% 7%	550
	11th to 20th	Day	11% 7% 23% 28% 23% 8%	630
	21st to end	Day	12% 5% 26% 28% 20% 8%	630
July	1st to 10th	Day	11% 2 17% 27% 22% 20%	621
	11th to 20th	Day	7% 3 19% 30% 25% 15%	618
	21st to end	Day	11% 3 17% 25% 27% 17%	488
August	1st to 10th	Day	9% 4 13% 25% 31% 18%	446
	11th to 20th	Day	11% 2 18% 30% 25% 14%	439
	21st to end	Day	9% 3 14% 28% 31% 15%	495
September	1st to 10th	Day	13% 4 14% 24% 31% 13%	450
	11th to 20th	Day	10% 3 14% 27% 30% 17%	450
	21st to end	Day	18% 9% 22% 21% 20% 10%	450
October	1st to 10th	Day	13% 6% 24% 29% 16% 12%	450
	11th to 20th	Day	17% 14% 32% 23% 12% 2	450
	21st to end	Day	28% 12% 33% 22% 4 1	335
November	1st to 10th	Day	16% 14% 36% 21% 9% 4	270
	11th to 20th	Day	24% 16% 29% 19% 11% 1	270
	21st to end	Day	27% 11% 41% 17% 3	270
December	1st to 10th	Day	21% 20% 35% 17% 6% 1	270
	11th to 20th	Day	21% 14% 43% 17% 4	270
	21st to end	Day	29% 20% 33% 15% 3	297
January	1st to 10th	Night	25% 15% 35% 19% 5%	950
	11th to 20th	Night	27% 14% 36% 18% 5%	927
	21st to end	Night	24% 13% 35% 24% 4	800
February	1st to 10th	Night	28% 11% 35% 24% 3	720
	11th to 20th	Night	22% 14% 37% 24% 2	703
	21st to end	Night	27% 12% 37% 21% 3	592
March	1st to 10th	Night	21% 13% 34% 24% 7% 1	720
	11th to 20th	Night	19% 14% 34% 26% 6% 1	720
	21st to end	Night	23% 13% 29% 26% 8% 1	792
April	1st to 10th	Night	19% 11% 34% 30% 5% 1	583
	11th to 20th	Night	20% 10% 31% 28% 9% 1	533
	21st to end	Night	21% 9% 34% 25% 9% 1	540
May	1st to 10th	Night	22% 8% 32% 27% 10% 1	540
	11th to 20th	Night	23% 5% 25% 30% 16% 2	531
	21st to end	Night	9% 3 23% 36% 26% 3	584
June	1st to 10th	Night	10% 2 24% 43% 22% 1	540
	11th to 20th	Night	11% 4 21% 39% 24% 1	540
	21st to end	Night	10% 2 23% 36% 27% 1	540
July	1st to 10th	Night	11% 1 14% 36% 32% 6%	525
	11th to 20th	Night	8% 2 16% 39% 30% 6%	522
	21st to end	Night	10% 1 12% 40% 35% 2	591
August	1st to 10th	Night	8% 2 10% 41% 34% 5%	537
	11th to 20th	Night	9% 2 12% 39% 34% 5%	534
	21st to end	Night	9% 2 11% 35% 37% 6%	594
September	1st to 10th	Night	13% 4 15% 33% 31% 4	624
	11th to 20th	Night	12% 3 14% 32% 34% 5%	720
	21st to end	Night	12% 5% 24% 32% 24% 3	720
October	1st to 10th	Night	13% 4 24% 33% 20% 5%	720
	11th to 20th	Night	23% 11% 27% 27% 12%	720
	21st to end	Night	24% 12% 31% 26% 7%	792
November	1st to 10th	Night	18% 9% 33% 26% 14% 1	740
	11th to 20th	Night	21% 15% 32% 25% 7% 1	760
	21st to end	Night	24% 14% 31% 25% 6%	760
December	1st to 10th	Night	26% 14% 33% 22% 5%	760
	11th to 20th	Night	25% 12% 34% 23% 5%	774
	21st to end	Night	29% 15% 33% 20% 3	1045

Page generated at 2024-01-19 09:28:33. Version ac07

Copyright 2024 Attilla Danko