Big Bend City(MN)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Big Bend City(MN) 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	12% 8% 3 7% 5% 4 5% 4 6% 7% 39%	101590
	Night	11% 9% 3 8% 5% 4 5% 4 5% 7% 39%	97537
Transparency	Day	42% 6% 13% 26% 12% 1	105173
	Night	42% 5% 13% 25% 13% 2	102085
Seeing	Day	16% 8% 29% 29% 15% 3	16031
	Night	15% 7% 31% 35% 11% 1	25905

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	11% 16% 5% 13% 10% 8% 5% 2 4 5% 22%	2218
	11th to 20th	Day	6% 10% 6% 13% 7% 9% 9% 6% 9% 8% 19%	2541
	21st to end	Day	7% 14% 12% 13% 7% 6% 5% 4 5% 6% 20%	3135
February	1st to 10th	Day	8% 12% 6% 9% 7% 5% 7% 6% 6% 8% 27%	1710
	11th to 20th	Day	7% 12% 4 9% 8% 8% 7% 6% 5% 6% 28%	1664
	21st to end	Day	9% 12% 5% 11% 8% 6% 5% 4 6% 8% 26%	1503
March	1st to 10th	Day	11% 13% 4 9% 6% 5% 5% 3 4 5% 35%	3360
	11th to 20th	Day	10% 11% 3 7% 5% 4 4 3 5% 7% 40%	3480
	21st to end	Day	23% 13% 4 12% 7% 6% 4 3 5% 5% 18%	3814
April	1st to 10th	Day	17% 9% 2 6% 4 3 4 3 6% 7% 37%	2199
	11th to 20th	Day	19% 12% 4 7% 4 4 4 3 4 6% 33%	2420
	21st to end	Day	22% 9% 2 7% 5% 5% 4 3 5% 6% 33%	2470
May	1st to 10th	Day	15% 6% 3 6% 5% 4 4 3 6% 8% 39%	4082
	11th to 20th	Day	14% 6% 2 6% 3 3 4 3 5% 7% 45%	4331
	21st to end	Day	16% 6% 2 7% 4 4 5% 4 7% 9% 36%	4824
June	1st to 10th	Day	12% 5% 2 5% 5% 4 4 4 5% 8% 46%	2807
	11th to 20th	Day	14% 7% 2 6% 5% 5% 4 5% 5% 7% 40%	2850
	21st to end	Day	9% 5% 2 6% 4 4 4 4 7% 10% 47%	2850
July	1st to 10th	Day	9% 5% 2 5% 5% 5% 6% 5% 8% 10% 41%	4750
	11th to 20th	Day	4 3 1 4 3 3 4 3 5% 8% 62%	4734
	21st to end	Day	5% 4 2 6% 4 4 5% 4 7% 10% 49%	4473
August	1st to 10th	Day	12% 5% 2 5% 4 4 4 4 6% 9% 46%	4104
	11th to 20th	Day	12% 5% 2 6% 4 4 5% 4 6% 9% 42%	4041
	21st to end	Day	9% 4 2 6% 4 4 4 4 6% 7% 50%	4514
September	1st to 10th	Day	10% 4 2 5% 3 3 4 2 5% 7% 54%	2280
	11th to 20th	Day	10% 5% 2 5% 4 4 4 4 6% 8% 47%	2092
	21st to end	Day	15% 5% 2 4 3 3 4 3 5% 6% 51%	2090
October	1st to 10th	Day	15% 7% 2 6% 4 3 4 3 5% 6% 44%	1910
	11th to 20th	Day	15% 9% 2 6% 3 3 4 3 5% 6% 44%	1900
	21st to end	Day	17% 9% 3 6% 4 3 4 3 6% 6% 40%	2022
November	1st to 10th	Day	13% 10% 3 8% 4 4 3 3 5% 7% 40%	1629
	11th to 20th	Day	9% 11% 5% 12% 8% 5% 5% 4 5% 7% 31%	1520
	21st to end	Day	13% 10% 4 9% 6% 4 4 3 6% 7% 35%	1520
December	1st to 10th	Day	8% 12% 4 11% 8% 6% 6% 5% 5% 7% 28%	1520
	11th to 20th	Day	9% 15% 6% 12% 7% 5% 4 4 5% 7% 27%	1791
	21st to end	Day	21% 14% 4 15% 5% 4 3 3 4 5% 21%	2442
January	1st to 10th	Night	8% 13% 6% 14% 11% 7% 4 4 5% 5% 23%	4737
	11th to 20th	Night	4 9% 5% 15% 10% 9% 11% 6% 7% 5% 19%	4424
	21st to end	Night	7% 17% 9% 10% 5% 5% 5% 4 6% 6% 27%	4532
February	1st to 10th	Night	6% 11% 5% 11% 7% 6% 6% 4 5% 7% 32%	2470
	11th to 20th	Night	6% 9% 4 10% 6% 6% 6% 5% 6% 7% 36%	2403
	21st to end	Night	11% 10% 4 7% 6% 5% 5% 5% 6% 6% 34%	1968
March	1st to 10th	Night	8% 7% 2 7% 5% 5% 5% 4 5% 7% 46%	3495
	11th to 20th	Night	9% 8% 3 7% 5% 4 4 4 6% 8% 42%	3480
	21st to end	Night	23% 13% 4 10% 5% 3 3 3 4 6% 26%	3817
April	1st to 10th	Night	14% 10% 3 5% 5% 3 4 3 6% 7% 39%	1980
	11th to 20th	Night	17% 10% 5% 7% 4 5% 4 3 4 5% 36%	1708
	21st to end	Night	19% 8% 3 7% 4 4 4 4 4 6% 38%	1710
May	1st to 10th	Night	18% 6% 2 6% 4 3 3 2 5% 7% 45%	2823
	11th to 20th	Night	11% 7% 2 5% 4 4 4 4 5% 8% 46%	2571
	21st to end	Night	17% 6% 2 6% 4 4 4 4 6% 8% 41%	2743
June	1st to 10th	Night	9% 4 3 5% 3 4 4 4 6% 8% 51%	1368
	11th to 20th	Night	9% 5% 1 4 3 4 5% 4 6% 7% 52%	1330
	21st to end	Night	8% 3 2 3 4 3 3 3 5% 7% 58%	1330
July	1st to 10th	Night	10% 5% 2 5% 4 4 5% 4 8% 10% 43%	2220
	11th to 20th	Night	3 2 1 3 2 3 4 4 5% 7% 66%	2220
	21st to end	Night	4 3 2 5% 4 4 4 4 7% 10% 54%	3087
August	1st to 10th	Night	9% 7% 2 6% 3 3 4 3 5% 7% 49%	2836
	11th to 20th	Night	12% 4 2 4 3 3 4 3 5% 7% 52%	2798
	21st to end	Night	7% 5% 1 6% 3 3 4 3 5% 8% 55%	3152
September	1st to 10th	Night	9% 4 2 3 2 3 3 3 5% 8% 58%	1900
	11th to 20th	Night	9% 5% 2 4 3 4 4 3 5% 6% 54%	2085
	21st to end	Night	10% 6% 2 6% 3 3 2 2 5% 5% 57%	2090
October	1st to 10th	Night	14% 6% 2 6% 4 3 3 3 4 6% 49%	2251
	11th to 20th	Night	14% 8% 2 4 4 4 4 3 5% 7% 46%	2280
	21st to end	Night	15% 9% 3 7% 4 3 4 3 5% 7% 40%	2574
November	1st to 10th	Night	10% 9% 2 7% 4 4 4 4 6% 8% 42%	2549
	11th to 20th	Night	10% 10% 4 10% 6% 5% 4 4 4 6% 37%	2660
	21st to end	Night	10% 10% 4 7% 5% 4 4 4 6% 7% 39%	2660
December	1st to 10th	Night	8% 12% 4 10% 8% 6% 4 4 6% 7% 31%	2660
	11th to 20th	Night	11% 11% 4 10% 7% 5% 5% 4 6% 8% 29%	3401
	21st to end	Night	19% 14% 5% 13% 6% 5% 5% 4 4 5% 21%	5225

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	65% 4 12% 14% 4	2219
	11th to 20th	Day	58% 5% 15% 18% 4	2541
	21st to end	Day	60% 8% 11% 16% 4	3135
February	1st to 10th	Day	54% 5% 14% 21% 7%	1710
	11th to 20th	Day	54% 6% 13% 19% 7% 1	1673
	21st to end	Day	55% 6% 13% 16% 9%	1503
March	1st to 10th	Day	50% 6% 11% 26% 7% 1	3360
	11th to 20th	Day	43% 5% 12% 28% 10% 2	3480
	21st to end	Day	66% 6% 9% 14% 4	3814
April	1st to 10th	Day	46% 4 12% 25% 12% 1	2199
	11th to 20th	Day	52% 4 9% 20% 13% 1	2420
	21st to end	Day	52% 4 11% 24% 8% 1	2470
May	1st to 10th	Day	41% 6% 10% 27% 15%	4120
	11th to 20th	Day	37% 6% 10% 29% 15% 3	4335
	21st to end	Day	41% 8% 12% 28% 11% 1	4837
June	1st to 10th	Day	35% 5% 15% 30% 13% 2	2807
	11th to 20th	Day	41% 6% 13% 24% 15% 2	2850
	21st to end	Day	31% 6% 18% 29% 14% 2	2850
July	1st to 10th	Day	34% 9% 19% 24% 13% 1	4676
	11th to 20th	Day	20% 5% 16% 38% 18% 2	4653
	21st to end	Day	28% 7% 17% 31% 16% 1	4332
August	1st to 10th	Day	36% 5% 13% 32% 12% 2	4090
	11th to 20th	Day	38% 6% 16% 31% 7% 1	4080
	21st to end	Day	32% 6% 18% 29% 14% 2	4513
September	1st to 10th	Day	30% 4 12% 38% 14% 1	2280
	11th to 20th	Day	33% 5% 17% 32% 12% 1	2092
	21st to end	Day	35% 4 13% 30% 17% 2	2090
October	1st to 10th	Day	31% 3 9% 30% 26% 1	3170
	11th to 20th	Day	35% 5% 12% 26% 21% 2	3140
	21st to end	Day	43% 4 16% 27% 10%	3315
November	1st to 10th	Day	44% 4 13% 24% 12% 3	1629
	11th to 20th	Day	53% 5% 12% 20% 8%	1520
	21st to end	Day	47% 5% 16% 21% 8% 2	1520
December	1st to 10th	Day	54% 6% 14% 17% 7%	1520
	11th to 20th	Day	55% 8% 16% 16% 5%	1788
	21st to end	Day	63% 5% 12% 14% 5%	2442
January	1st to 10th	Night	62% 4 11% 17% 5%	4737
	11th to 20th	Night	61% 7% 12% 15% 5%	4424
	21st to end	Night	56% 6% 13% 18% 6%	4532
February	1st to 10th	Night	51% 5% 14% 19% 10% 1	2470
	11th to 20th	Night	45% 6% 13% 22% 12% 1	2404
	21st to end	Night	49% 6% 13% 19% 12% 2	1968
March	1st to 10th	Night	36% 6% 13% 29% 13% 2	3495
	11th to 20th	Night	38% 6% 11% 33% 12%	3480
	21st to end	Night	60% 4 10% 19% 6% 1	3817
April	1st to 10th	Night	44% 4 12% 27% 12% 1	1980
	11th to 20th	Night	49% 4 6% 23% 14% 3	1708
	21st to end	Night	48% 5% 10% 22% 13% 2	1710
May	1st to 10th	Night	40% 5% 10% 26% 16% 4	2850
	11th to 20th	Night	35% 8% 8% 26% 20% 3	2572
	21st to end	Night	40% 7% 12% 26% 14% 1	2751
June	1st to 10th	Night	30% 5% 15% 30% 17% 3	1368
	11th to 20th	Night	30% 5% 18% 27% 17% 3	1330
	21st to end	Night	26% 4 16% 32% 19% 3	1330
July	1st to 10th	Night	34% 8% 19% 22% 15% 1	2185
	11th to 20th	Night	16% 5% 13% 45% 18% 3	2178
	21st to end	Night	24% 6% 19% 32% 17% 2	2989
August	1st to 10th	Night	34% 6% 14% 28% 16% 3	2826
	11th to 20th	Night	33% 5% 16% 32% 12% 1	2825
	21st to end	Night	29% 6% 17% 30% 17% 3	3152
September	1st to 10th	Night	26% 5% 14% 35% 20% 1	1900
	11th to 20th	Night	30% 4 15% 32% 18%	2085
	21st to end	Night	31% 4 11% 32% 21% 1	2090
October	1st to 10th	Night	24% 2 6% 34% 29% 4	3758
	11th to 20th	Night	31% 3 13% 30% 21% 2	3779
	21st to end	Night	40% 3 13% 29% 14% 1	4235
November	1st to 10th	Night	39% 5% 15% 24% 16% 2	2549
	11th to 20th	Night	48% 5% 13% 21% 12% 1	2660
	21st to end	Night	44% 5% 18% 23% 9% 1	2660
December	1st to 10th	Night	51% 5% 16% 20% 8%	2660
	11th to 20th	Night	51% 6% 19% 18% 5%	3403
	21st to end	Night	64% 7% 9% 15% 4	5225

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	15% 7% 29% 30% 15% 4	270
	11th to 20th	Day	16% 10% 29% 33% 10% 1	270
	21st to end	Day	17% 6% 34% 26% 14% 2	297
February	1st to 10th	Day	12% 13% 39% 31% 5%	270
	11th to 20th	Day	16% 12% 36% 29% 7%	270
	21st to end	Day	16% 9% 35% 32% 8%	225
March	1st to 10th	Day	20% 8% 38% 26% 8%	270
	11th to 20th	Day	20% 6% 36% 27% 9% 1	270
	21st to end	Day	26% 7% 27% 26% 10% 4	297
April	1st to 10th	Day	28% 12% 30% 23% 7%	379
	11th to 20th	Day	27% 16% 24% 22% 10% 1	618
	21st to end	Day	25% 10% 31% 22% 10% 2	650
May	1st to 10th	Day	19% 11% 33% 26% 9% 1	653
	11th to 20th	Day	22% 9% 28% 24% 14% 3	675
	21st to end	Day	16% 7% 29% 32% 13% 3	734
June	1st to 10th	Day	10% 7% 25% 35% 20% 4	680
	11th to 20th	Day	16% 9% 34% 27% 13% 3	680
	21st to end	Day	10% 6% 31% 33% 16% 4	680
July	1st to 10th	Day	9% 3 23% 33% 26% 7%	671
	11th to 20th	Day	8% 6% 25% 36% 21% 5%	668
	21st to end	Day	6% 3 24% 38% 23% 6%	739
August	1st to 10th	Day	9% 3 20% 37% 25% 5%	676
	11th to 20th	Day	15% 4 17% 35% 22% 7%	665
	21st to end	Day	8% 4 28% 31% 22% 6%	743
September	1st to 10th	Day	12% 6% 26% 33% 18% 4	490
	11th to 20th	Day	11% 3 32% 32% 17% 5%	302
	21st to end	Day	19% 11% 27% 26% 14% 4	300
October	1st to 10th	Day	18% 9% 30% 26% 14% 4	300
	11th to 20th	Day	19% 14% 33% 23% 9% 2	300
	21st to end	Day	22% 13% 34% 22% 8% 1	330
November	1st to 10th	Day	25% 7% 26% 31% 9% 1	282
	11th to 20th	Day	15% 14% 39% 26% 6% 1	270
	21st to end	Day	21% 15% 31% 22% 10%	270
December	1st to 10th	Day	10% 7% 40% 28% 13% 1	270
	11th to 20th	Day	16% 9% 39% 29% 9%	270
	21st to end	Day	30% 9% 30% 24% 7%	297
January	1st to 10th	Night	11% 8% 35% 34% 10% 1	950
	11th to 20th	Night	14% 9% 31% 36% 9% 1	950
	21st to end	Night	18% 8% 32% 33% 8% 1	1045
February	1st to 10th	Night	12% 9% 37% 33% 8% 1	950
	11th to 20th	Night	12% 10% 37% 31% 10% 1	929
	21st to end	Night	16% 9% 31% 32% 11% 1	712
March	1st to 10th	Night	15% 7% 36% 31% 9%	624
	11th to 20th	Night	17% 9% 35% 33% 6% 1	570
	21st to end	Night	21% 7% 30% 30% 11% 2	627
April	1st to 10th	Night	21% 9% 36% 28% 6%	570
	11th to 20th	Night	23% 12% 28% 28% 9% 1	563
	21st to end	Night	23% 5% 31% 32% 9% 1	570
May	1st to 10th	Night	19% 7% 32% 33% 8% 1	570
	11th to 20th	Night	18% 5% 31% 34% 11% 1	561
	21st to end	Night	16% 6% 29% 36% 12% 1	617
June	1st to 10th	Night	11% 6% 26% 41% 16% 1	570
	11th to 20th	Night	11% 4 34% 41% 9%	570
	21st to end	Night	10% 3 25% 48% 13% 1	570
July	1st to 10th	Night	6% 2 20% 46% 24% 2	555
	11th to 20th	Night	6% 2 26% 47% 18% 1	552
	21st to end	Night	5% 1 23% 49% 21% 2	624
August	1st to 10th	Night	9% 2 19% 48% 20% 2	567
	11th to 20th	Night	10% 3 16% 45% 23% 4	564
	21st to end	Night	6% 3 23% 46% 21% 2	627
September	1st to 10th	Night	10% 2 28% 40% 18% 2	570
	11th to 20th	Night	11% 4 31% 36% 17% 2	570
	21st to end	Night	14% 5% 32% 33% 14% 1	570
October	1st to 10th	Night	17% 8% 32% 31% 11% 1	731
	11th to 20th	Night	20% 8% 33% 29% 9%	760
	21st to end	Night	21% 9% 32% 31% 7%	902
November	1st to 10th	Night	16% 8% 33% 32% 10%	950
	11th to 20th	Night	15% 9% 36% 29% 9% 1	950
	21st to end	Night	15% 12% 34% 31% 9%	950
December	1st to 10th	Night	14% 8% 34% 34% 10% 1	950
	11th to 20th	Night	20% 6% 30% 35% 8% 1	950
	21st to end	Night	26% 8% 31% 28% 7% 1	1045

Page generated at 2024-11-03 01:11:26. Version ac07

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