Poplar Bluff
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Poplar Bluff clear sky chart from 2005-11-06 to 2024-12-24.

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	13% 6% 2 5% 4 4 4 4 6% 7% 46%	101459
	Night	13% 6% 2 5% 4 3 4 3 5% 7% 48%	98720
Transparency	Day	36% 6% 11% 25% 19% 4	105094
	Night	34% 5% 10% 26% 21% 5%	103226
Seeing	Day	15% 8% 24% 26% 19% 7%	15632
	Night	16% 6% 26% 32% 17% 2	25481

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	14% 9% 3 6% 3 4 3 3 4 5% 46%	2563
	11th to 20th	Day	15% 8% 3 5% 3 3 3 3 4 4 48%	2850
	21st to end	Day	24% 8% 3 5% 3 2 4 3 4 4 40%	3135
February	1st to 10th	Day	18% 8% 3 6% 4 4 4 4 3 6% 41%	1748
	11th to 20th	Day	16% 9% 3 6% 4 4 4 3 4 6% 42%	1848
	21st to end	Day	18% 8% 3 7% 5% 4 4 3 5% 6% 37%	1570
March	1st to 10th	Day	22% 9% 3 6% 4 4 3 3 5% 4 39%	3198
	11th to 20th	Day	14% 6% 2 5% 3 3 3 2 4 6% 51%	3480
	21st to end	Day	15% 6% 2 6% 4 4 4 3 5% 7% 42%	4021
April	1st to 10th	Day	12% 6% 2 6% 3 4 3 3 6% 7% 46%	2280
	11th to 20th	Day	15% 6% 3 6% 5% 4 4 3 6% 6% 42%	2254
	21st to end	Day	17% 6% 2 6% 4 4 5% 3 6% 6% 41%	2280
May	1st to 10th	Day	13% 7% 2 6% 5% 4 6% 5% 7% 11% 34%	3765
	11th to 20th	Day	15% 5% 2 5% 4 4 5% 4 8% 9% 38%	4157
	21st to end	Day	12% 6% 3 6% 5% 4 5% 4 7% 9% 38%	4824
June	1st to 10th	Day	8% 5% 2 6% 4 5% 5% 4 7% 8% 46%	2660
	11th to 20th	Day	5% 3 1 5% 4 4 5% 4 7% 10% 51%	2660
	21st to end	Day	5% 3 1 5% 4 5% 6% 5% 7% 10% 49%	2660
July	1st to 10th	Day	8% 5% 2 6% 4 5% 5% 5% 7% 10% 43%	4440
	11th to 20th	Day	5% 3 1 4 3 4 4 4 7% 10% 55%	4357
	21st to end	Day	10% 7% 3 9% 5% 6% 6% 5% 6% 8% 35%	4465
August	1st to 10th	Day	3 2 1 4 3 3 4 4 6% 10% 60%	3980
	11th to 20th	Day	10% 5% 2 6% 4 4 6% 4 6% 8% 46%	3729
	21st to end	Day	5% 3 1 4 3 3 4 3 5% 8% 59%	4180
September	1st to 10th	Day	9% 5% 1 5% 4 4 4 4 7% 8% 48%	2280
	11th to 20th	Day	11% 5% 2 5% 4 4 4 3 6% 7% 48%	2250
	21st to end	Day	11% 5% 2 4 3 3 3 3 5% 6% 53%	2090
October	1st to 10th	Day	9% 4 2 5% 3 4 3 3 4 6% 58%	1913
	11th to 20th	Day	12% 6% 2 4 4 3 3 2 5% 4 55%	1900
	21st to end	Day	19% 5% 2 5% 3 2 3 3 4 6% 48%	2090
November	1st to 10th	Day	11% 6% 3 4 3 2 4 2 5% 6% 54%	1795
	11th to 20th	Day	14% 7% 2 5% 4 3 3 3 4 6% 50%	1800
	21st to end	Day	20% 6% 1 5% 3 3 3 3 3 5% 47%	1800
December	1st to 10th	Day	17% 7% 2 6% 4 3 4 3 5% 5% 44%	1632
	11th to 20th	Day	18% 6% 2 6% 5% 4 4 3 5% 6% 42%	1998
	21st to end	Day	19% 9% 3 7% 6% 4 3 3 5% 5% 35%	2807
January	1st to 10th	Night	18% 6% 2 5% 3 3 3 3 6% 7% 43%	4389
	11th to 20th	Night	16% 6% 2 5% 4 3 3 3 4 6% 47%	4120
	21st to end	Night	24% 8% 2 5% 3 3 3 3 4 5% 42%	4532
February	1st to 10th	Night	19% 9% 3 6% 4 3 3 3 4 5% 41%	2429
	11th to 20th	Night	17% 6% 2 6% 4 3 3 2 4 6% 46%	2218
	21st to end	Night	19% 6% 2 5% 4 4 3 3 5% 6% 43%	1884
March	1st to 10th	Night	22% 8% 2 6% 3 3 3 3 4 4 43%	3683
	11th to 20th	Night	14% 5% 2 6% 4 3 3 2 4 5% 51%	3480
	21st to end	Night	12% 5% 2 7% 5% 4 3 4 5% 7% 45%	3608
April	1st to 10th	Night	11% 6% 1 5% 4 3 4 4 5% 8% 50%	1900
	11th to 20th	Night	15% 5% 1 5% 4 4 3 3 5% 8% 46%	1875
	21st to end	Night	18% 5% 2 6% 5% 3 4 4 5% 7% 41%	1900
May	1st to 10th	Night	18% 6% 2 5% 4 3 4 3 5% 8% 44%	3130
	11th to 20th	Night	13% 6% 3 7% 4 4 4 3 5% 7% 45%	2732
	21st to end	Night	10% 7% 2 6% 4 4 6% 4 7% 8% 41%	2743
June	1st to 10th	Night	8% 5% 2 5% 4 4 4 4 8% 8% 46%	1520
	11th to 20th	Night	3 3 2 4 4 3 5% 3 6% 11% 58%	1520
	21st to end	Night	3 3 1 4 3 4 4 4 7% 12% 55%	1520
July	1st to 10th	Night	8% 3 2 5% 4 4 4 4 7% 11% 47%	2530
	11th to 20th	Night	4 3 1 4 3 4 4 4 6% 8% 59%	2609
	21st to end	Night	9% 7% 2 7% 5% 5% 5% 5% 7% 8% 39%	3098
August	1st to 10th	Night	3 2 1 4 2 4 3 4 6% 8% 62%	2954
	11th to 20th	Night	6% 4 2 5% 4 4 4 4 6% 9% 51%	3100
	21st to end	Night	4 3 1 4 3 3 4 4 7% 9% 58%	3476
September	1st to 10th	Night	9% 4 1 4 3 4 3 3 6% 8% 55%	1900
	11th to 20th	Night	9% 5% 2 6% 5% 5% 4 4 4 6% 51%	1909
	21st to end	Night	10% 4 2 4 3 4 3 3 4 6% 57%	2090
October	1st to 10th	Night	6% 4 1 4 3 2 3 3 4 6% 63%	2263
	11th to 20th	Night	13% 5% 1 4 3 2 2 3 4 4 59%	2280
	21st to end	Night	19% 6% 2 5% 3 3 2 2 4 5% 50%	2508
November	1st to 10th	Night	13% 5% 1 4 3 2 3 2 4 6% 57%	2503
	11th to 20th	Night	14% 5% 1 5% 3 3 4 3 5% 6% 53%	2600
	21st to end	Night	17% 5% 2 4 3 3 3 2 5% 6% 49%	2600
December	1st to 10th	Night	17% 8% 2 5% 4 3 3 3 4 6% 44%	2765
	11th to 20th	Night	17% 7% 2 5% 4 3 4 2 4 6% 45%	3419
	21st to end	Night	18% 8% 3 8% 4 4 4 3 5% 6% 36%	4933

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	41% 3 8% 30% 15% 2	2564
	11th to 20th	Day	40% 4 8% 26% 19% 3	2850
	21st to end	Day	47% 3 10% 18% 18% 3	3135
February	1st to 10th	Day	45% 4 11% 22% 15% 2	1748
	11th to 20th	Day	44% 4 11% 21% 16% 4	1858
	21st to end	Day	48% 3 11% 19% 14% 5%	1570
March	1st to 10th	Day	49% 4 8% 17% 14% 8%	3198
	11th to 20th	Day	36% 4 9% 26% 20% 6%	3480
	21st to end	Day	41% 5% 13% 24% 15% 1	4021
April	1st to 10th	Day	36% 4 11% 26% 19% 3	2280
	11th to 20th	Day	41% 5% 10% 21% 17% 5%	2254
	21st to end	Day	42% 6% 10% 23% 17% 1	2280
May	1st to 10th	Day	41% 10% 15% 19% 13% 2	3800
	11th to 20th	Day	40% 9% 13% 24% 13% 1	4161
	21st to end	Day	40% 7% 11% 23% 18% 1	4837
June	1st to 10th	Day	32% 8% 14% 26% 18% 2	2660
	11th to 20th	Day	26% 7% 13% 31% 20% 4	2660
	21st to end	Day	26% 8% 16% 28% 17% 5%	2660
July	1st to 10th	Day	33% 8% 14% 26% 16% 3	4371
	11th to 20th	Day	23% 6% 12% 36% 20% 2	4282
	21st to end	Day	44% 9% 13% 26% 8% 1	4325
August	1st to 10th	Day	19% 7% 16% 31% 25% 1	3966
	11th to 20th	Day	34% 7% 14% 23% 19% 3	3765
	21st to end	Day	23% 5% 12% 39% 18% 3	4179
September	1st to 10th	Day	31% 7% 11% 27% 20% 4	2280
	11th to 20th	Day	34% 6% 9% 24% 25% 3	2250
	21st to end	Day	31% 4 9% 25% 28% 3	2090
October	1st to 10th	Day	17% 2 5% 17% 44% 15%	3173
	11th to 20th	Day	23% 3 4 20% 39% 10%	3140
	21st to end	Day	30% 3 5% 29% 27% 5%	3428
November	1st to 10th	Day	31% 5% 10% 24% 22% 7%	1795
	11th to 20th	Day	36% 3 6% 25% 24% 7%	1800
	21st to end	Day	42% 3 7% 25% 20% 2	1800
December	1st to 10th	Day	41% 4 9% 27% 16% 3	1632
	11th to 20th	Day	44% 4 8% 27% 16% 2	1995
	21st to end	Day	50% 4 10% 20% 13% 3	2807
January	1st to 10th	Night	40% 4 7% 31% 17% 2	4389
	11th to 20th	Night	38% 4 9% 29% 16% 3	4120
	21st to end	Night	46% 4 9% 24% 15% 2	4532
February	1st to 10th	Night	46% 3 8% 23% 17% 2	2429
	11th to 20th	Night	41% 3 11% 23% 18% 4	2219
	21st to end	Night	42% 4 9% 21% 18% 6%	1884
March	1st to 10th	Night	46% 4 8% 19% 16% 8%	3683
	11th to 20th	Night	37% 5% 9% 25% 19% 7%	3480
	21st to end	Night	38% 5% 8% 34% 13% 1	3608
April	1st to 10th	Night	32% 5% 12% 25% 21% 5%	1900
	11th to 20th	Night	36% 4 9% 24% 20% 7%	1875
	21st to end	Night	41% 7% 7% 25% 17% 3	1900
May	1st to 10th	Night	39% 6% 15% 26% 12% 1	3160
	11th to 20th	Night	38% 9% 14% 21% 17% 1	2733
	21st to end	Night	37% 8% 12% 24% 17% 2	2751
June	1st to 10th	Night	31% 7% 13% 26% 21% 3	1520
	11th to 20th	Night	19% 6% 13% 31% 24% 7%	1520
	21st to end	Night	21% 7% 16% 29% 19% 9%	1520
July	1st to 10th	Night	29% 7% 15% 28% 17% 4	2490
	11th to 20th	Night	22% 6% 13% 36% 20% 4	2561
	21st to end	Night	39% 9% 15% 24% 13%	2999
August	1st to 10th	Night	18% 6% 18% 34% 23% 1	2944
	11th to 20th	Night	28% 7% 17% 27% 17% 4	3130
	21st to end	Night	21% 5% 11% 37% 23% 3	3476
September	1st to 10th	Night	27% 5% 10% 30% 21% 7%	1900
	11th to 20th	Night	33% 5% 9% 23% 25% 4	1909
	21st to end	Night	28% 5% 9% 22% 30% 5%	2090
October	1st to 10th	Night	14% 2 6% 17% 41% 20%	3783
	11th to 20th	Night	21% 3 5% 17% 39% 16%	3779
	21st to end	Night	29% 3 5% 25% 30% 8%	4120
November	1st to 10th	Night	30% 3 8% 27% 26% 6%	2503
	11th to 20th	Night	31% 3 6% 26% 24% 9%	2600
	21st to end	Night	36% 4 7% 25% 24% 3	2600
December	1st to 10th	Night	42% 4 9% 25% 18% 3	2765
	11th to 20th	Night	41% 3 8% 25% 21% 2	3421
	21st to end	Night	48% 5% 10% 20% 14% 2	4933

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% 36% 17% 4	270
	11th to 20th	Day	28% 14% 41% 16% 2	270
	21st to end	Day	20% 18% 42% 17% 4	297
February	1st to 10th	Day	23% 18% 39% 15% 5%	270
	11th to 20th	Day	27% 22% 34% 14% 3	270
	21st to end	Day	32% 19% 34% 12% 3	225
March	1st to 10th	Day	24% 15% 42% 15% 4	270
	11th to 20th	Day	27% 14% 41% 16% 2	270
	21st to end	Day	27% 14% 35% 16% 8%	414
April	1st to 10th	Day	18% 16% 32% 26% 8%	460
	11th to 20th	Day	23% 15% 30% 23% 8% 1	452
	21st to end	Day	20% 12% 35% 21% 9% 2	460
May	1st to 10th	Day	20% 13% 29% 25% 11% 2	463
	11th to 20th	Day	19% 6% 25% 26% 16% 7%	548
	21st to end	Day	10% 5% 28% 28% 20% 8%	734
June	1st to 10th	Day	10% 5% 19% 29% 25% 12%	680
	11th to 20th	Day	6% 3 16% 41% 24% 10%	680
	21st to end	Day	5% 3 22% 36% 24% 10%	680
July	1st to 10th	Day	9% 2 11% 27% 34% 17%	671
	11th to 20th	Day	5% 1 15% 35% 32% 13%	668
	21st to end	Day	8% 2 13% 30% 33% 14%	739
August	1st to 10th	Day	6% 1 11% 37% 31% 13%	604
	11th to 20th	Day	14% 2 13% 29% 31% 11%	479
	21st to end	Day	10% 2 6% 29% 35% 18%	539
September	1st to 10th	Day	8% 3 11% 30% 34% 14%	490
	11th to 20th	Day	11% 3 12% 27% 32% 16%	490
	21st to end	Day	15% 6% 21% 26% 21% 11%	490
October	1st to 10th	Day	9% 6% 18% 38% 21% 8%	313
	11th to 20th	Day	17% 13% 28% 25% 13% 4	300
	21st to end	Day	25% 14% 33% 17% 10% 1	330
November	1st to 10th	Day	15% 15% 33% 24% 11% 2	300
	11th to 20th	Day	15% 14% 35% 26% 11%	300
	21st to end	Day	24% 12% 33% 20% 9% 1	300
December	1st to 10th	Day	20% 16% 35% 18% 9% 2	300
	11th to 20th	Day	27% 15% 28% 20% 9% 1	300
	21st to end	Day	28% 18% 32% 19% 3	306
January	1st to 10th	Night	22% 11% 34% 27% 6% 1	950
	11th to 20th	Night	22% 13% 36% 24% 5%	950
	21st to end	Night	19% 9% 39% 29% 3	1045
February	1st to 10th	Night	23% 10% 37% 26% 3	909
	11th to 20th	Night	20% 13% 40% 25% 2	743
	21st to end	Night	23% 13% 38% 24% 2	628
March	1st to 10th	Night	22% 11% 33% 31% 3	736
	11th to 20th	Night	22% 7% 35% 30% 5%	570
	21st to end	Night	22% 9% 35% 26% 9%	627
April	1st to 10th	Night	13% 10% 39% 31% 8%	570
	11th to 20th	Night	17% 10% 31% 30% 12% 1	563
	21st to end	Night	18% 6% 35% 31% 9% 1	570
May	1st to 10th	Night	16% 4 30% 34% 15% 1	570
	11th to 20th	Night	17% 3 24% 35% 18% 2	561
	21st to end	Night	11% 4 22% 35% 24% 3	617
June	1st to 10th	Night	10% 2 15% 38% 31% 4	570
	11th to 20th	Night	5% 1 13% 51% 28% 3	570
	21st to end	Night	4 2 17% 40% 35% 2	570
July	1st to 10th	Night	6% 2 10% 33% 42% 8%	555
	11th to 20th	Night	6% 1 6% 38% 41% 7%	552
	21st to end	Night	8% 2 9% 36% 39% 8%	624
August	1st to 10th	Night	6% 1 8% 37% 42% 6%	567
	11th to 20th	Night	9% 1 7% 36% 42% 5%	564
	21st to end	Night	6% 2 7% 33% 45% 7%	627
September	1st to 10th	Night	11% 1 8% 35% 40% 5%	570
	11th to 20th	Night	10% 1 11% 34% 36% 8%	579
	21st to end	Night	11% 3 17% 35% 29% 5%	760
October	1st to 10th	Night	8% 3 20% 38% 28% 4	760
	11th to 20th	Night	17% 5% 29% 32% 16% 1	760
	21st to end	Night	22% 6% 27% 33% 12%	836
November	1st to 10th	Night	16% 5% 29% 35% 14% 1	780
	11th to 20th	Night	16% 8% 32% 33% 11%	800
	21st to end	Night	19% 7% 31% 32% 11% 1	800
December	1st to 10th	Night	22% 7% 31% 32% 7%	965
	11th to 20th	Night	24% 8% 28% 33% 7%	1000
	21st to end	Night	24% 10% 31% 29% 5%	1063

Page generated at 2024-12-21 03:13:51. Version ac07

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