Merle K. (Mudhole) Smith Airport
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Merle K. (Mudhole) Smith Airport clear sky chart from 2005-11-06 to 2024-11-10.

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	35% 16% 4 8% 4 3 3 3 3 4 17%	106848
	Night	31% 18% 4 7% 4 3 3 3 3 4 20%	100868
Transparency	Day	69% 8% 10% 8% 4 1	106554
	Night	68% 7% 8% 9% 6% 2	100812
Seeing	Day	38% 8% 14% 18% 17% 5%	17364
	Night	38% 9% 16% 18% 14% 4	22226

By Month

Percentage Cloud Cover NW (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	23% 21% 5% 8% 3 3 3 3 5% 6% 22%	1579
	11th to 20th	Day	27% 17% 3 5% 2 1 1 1 2 3 37%	1752
	21st to end	Day	31% 24% 3 8% 4 3 2 2 2 2 18%	2090
February	1st to 10th	Day	20% 21% 4 7% 3 5% 3 2 3 4 29%	1368
	11th to 20th	Day	29% 23% 5% 8% 3 3 2 2 3 3 18%	1479
	21st to end	Day	16% 18% 3 7% 3 3 3 2 3 5% 36%	1343
March	1st to 10th	Day	15% 26% 5% 8% 4 3 3 3 4 3 25%	3114
	11th to 20th	Day	21% 25% 5% 7% 4 4 4 3 4 4 18%	3314
	21st to end	Day	23% 21% 5% 9% 4 5% 4 4 4 5% 17%	4059
April	1st to 10th	Day	23% 25% 5% 8% 5% 4 3 3 3 3 19%	2398
	11th to 20th	Day	18% 21% 3 8% 5% 4 4 3 4 4 27%	2501
	21st to end	Day	24% 19% 5% 9% 6% 4 3 4 4 4 20%	2774
May	1st to 10th	Day	38% 23% 4 9% 5% 3 3 2 2 3 9%	4750
	11th to 20th	Day	22% 19% 6% 11% 7% 4 4 3 4 4 18%	5099
	21st to end	Day	35% 13% 3 9% 5% 4 4 3 5% 4 14%	5857
June	1st to 10th	Day	36% 14% 3 8% 5% 3 4 2 3 4 17%	3230
	11th to 20th	Day	32% 12% 4 7% 6% 4 4 4 4 5% 18%	3414
	21st to end	Day	39% 12% 3 7% 5% 3 3 3 4 4 18%	3420
July	1st to 10th	Day	48% 12% 3 7% 5% 3 3 3 3 3 10%	5553
	11th to 20th	Day	46% 10% 4 7% 4 3 3 3 4 5% 12%	5380
	21st to end	Day	44% 13% 4 8% 5% 4 4 3 4 4 8%	5499
August	1st to 10th	Day	50% 10% 3 6% 4 3 2 2 3 3 14%	4869
	11th to 20th	Day	45% 7% 3 7% 4 4 4 3 4 5% 15%	4479
	21st to end	Day	48% 9% 2 7% 3 3 3 3 4 4 13%	4725
September	1st to 10th	Day	55% 8% 3 5% 4 2 3 1 2 3 14%	2438
	11th to 20th	Day	52% 9% 2 5% 3 2 3 2 3 4 16%	2180
	21st to end	Day	44% 9% 3 6% 3 5% 3 3 3 4 18%	2090
October	1st to 10th	Day	43% 12% 5% 8% 4 4 3 2 3 3 12%	3079
	11th to 20th	Day	30% 12% 4 8% 4 3 3 2 3 4 28%	2834
	21st to end	Day	32% 12% 3 7% 5% 4 3 2 4 4 25%	2741
November	1st to 10th	Day	31% 17% 4 9% 4 3 3 2 2 3 22%	1365
	11th to 20th	Day	24% 14% 3 8% 5% 3 3 4 4 4 28%	1232
	21st to end	Day	28% 22% 5% 6% 3 3 2 3 4 4 19%	950
December	1st to 10th	Day	35% 18% 3 8% 3 3 3 1 3 4 19%	950
	11th to 20th	Day	21% 32% 6% 8% 5% 3 2 2 3 3 15%	1205
	21st to end	Day	20% 28% 5% 10% 4 4 3 2 3 4 18%	1738
January	1st to 10th	Night	22% 23% 5% 9% 4 3 3 2 4 4 21%	5366
	11th to 20th	Night	25% 19% 3 5% 3 2 2 2 2 3 34%	5149
	21st to end	Night	29% 22% 4 10% 4 3 3 2 3 2 17%	5577
February	1st to 10th	Night	20% 21% 4 7% 4 3 3 2 4 4 29%	2809
	11th to 20th	Night	29% 25% 4 8% 4 3 2 2 3 3 18%	2588
	21st to end	Night	16% 16% 3 7% 4 3 4 4 4 5% 34%	2108
March	1st to 10th	Night	17% 27% 4 6% 3 3 2 3 4 4 27%	3740
	11th to 20th	Night	20% 23% 6% 10% 5% 3 4 3 3 3 21%	3644
	21st to end	Night	21% 22% 4 8% 4 4 4 4 4 4 20%	3571
April	1st to 10th	Night	22% 22% 5% 8% 5% 4 3 3 4 4 21%	1782
	11th to 20th	Night	18% 18% 4 6% 6% 4 3 4 4 4 29%	1627
	21st to end	Night	23% 16% 3 9% 5% 4 3 3 4 4 24%	1406
May	1st to 10th	Night	37% 22% 5% 9% 4 2 3 2 3 3 10%	2220
	11th to 20th	Night	22% 18% 4 8% 6% 6% 5% 4 4 5% 20%	1801
	21st to end	Night	34% 13% 3 6% 5% 4 3 3 4 6% 19%	1718
June	1st to 10th	Night	35% 9% 3 9% 5% 4 4 2 4 4 22%	950
	11th to 20th	Night	29% 11% 3 5% 5% 5% 4 4 5% 6% 24%	763
	21st to end	Night	34% 10% 3 6% 5% 4 4 4 4 5% 21%	760
July	1st to 10th	Night	50% 10% 2 6% 5% 4 3 2 3 4 12%	1411
	11th to 20th	Night	45% 10% 3 6% 4 3 4 3 4 4 13%	1580
	21st to end	Night	46% 12% 3 7% 5% 4 4 3 4 4 9%	2064
August	1st to 10th	Night	48% 9% 2 6% 4 4 4 3 3 4 15%	2070
	11th to 20th	Night	46% 8% 2 5% 5% 3 3 3 4 4 17%	2358
	21st to end	Night	51% 9% 2 5% 3 3 3 2 4 3 14%	2942
September	1st to 10th	Night	50% 9% 3 6% 4 3 3 3 3 3 14%	1739
	11th to 20th	Night	48% 11% 2 5% 3 3 3 3 3 3 17%	2000
	21st to end	Night	44% 11% 3 6% 3 2 3 2 4 4 18%	2090
October	1st to 10th	Night	46% 13% 3 8% 4 3 3 2 3 2 13%	3884
	11th to 20th	Night	32% 13% 3 7% 4 3 3 2 3 3 27%	4094
	21st to end	Night	35% 14% 3 6% 4 3 4 3 4 5% 20%	4817
November	1st to 10th	Night	31% 18% 3 7% 4 3 3 2 3 3 22%	2917
	11th to 20th	Night	25% 15% 3 6% 4 3 3 3 5% 4 30%	2945
	21st to end	Night	30% 21% 4 7% 4 3 3 2 3 3 19%	3230
December	1st to 10th	Night	36% 18% 3 7% 4 3 4 3 3 4 16%	3230
	11th to 20th	Night	23% 28% 5% 10% 4 3 3 2 3 3 16%	4000
	21st to end	Night	23% 28% 5% 8% 4 4 4 2 3 3 14%	5918

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	60% 8% 9% 12% 7% 4	1579
	11th to 20th	Day	56% 3 4 13% 10% 13%	1770
	21st to end	Day	72% 6% 4 8% 7% 3	2090
February	1st to 10th	Day	60% 5% 8% 11% 8% 7%	1368
	11th to 20th	Day	74% 5% 6% 6% 8% 2	1486
	21st to end	Day	52% 6% 8% 13% 14% 6%	1343
March	1st to 10th	Day	61% 7% 7% 8% 7% 10%	3114
	11th to 20th	Day	65% 9% 10% 8% 7% 3	3314
	21st to end	Day	63% 10% 12% 6% 5% 3	4059
April	1st to 10th	Day	69% 6% 9% 11% 4 2	2398
	11th to 20th	Day	59% 6% 11% 17% 7% 1	2501
	21st to end	Day	65% 6% 10% 12% 6%	2774
May	1st to 10th	Day	79% 9% 5% 6% 1	4750
	11th to 20th	Day	61% 12% 12% 12% 3	5102
	21st to end	Day	67% 10% 12% 9% 1	5858
June	1st to 10th	Day	71% 8% 11% 7% 3	3230
	11th to 20th	Day	67% 11% 13% 8% 2	3414
	21st to end	Day	69% 8% 15% 8%	3420
July	1st to 10th	Day	78% 9% 7% 6% 1	5468
	11th to 20th	Day	75% 7% 16% 3	5287
	21st to end	Day	78% 9% 10% 3	5326
August	1st to 10th	Day	76% 7% 8% 9%	4850
	11th to 20th	Day	68% 10% 14% 6% 3	4524
	21st to end	Day	75% 7% 10% 8% 1	4724
September	1st to 10th	Day	78% 5% 8% 7% 2	2438
	11th to 20th	Day	74% 6% 8% 9% 2	2180
	21st to end	Day	71% 7% 9% 8% 5%	2090
October	1st to 10th	Day	77% 6% 8% 6% 2	3079
	11th to 20th	Day	62% 6% 10% 8% 11% 4	2834
	21st to end	Day	63% 7% 10% 9% 10% 1	2741
November	1st to 10th	Day	70% 6% 6% 6% 8% 3	1365
	11th to 20th	Day	59% 7% 8% 15% 9% 3	1232
	21st to end	Day	67% 8% 7% 10% 7% 1	950
December	1st to 10th	Day	71% 6% 8% 7% 7% 1	950
	11th to 20th	Day	73% 7% 7% 7% 6%	1208
	21st to end	Day	67% 8% 8% 7% 6% 5%	1738
January	1st to 10th	Night	66% 6% 7% 9% 8% 5%	5366
	11th to 20th	Night	57% 5% 5% 11% 12% 10%	5194
	21st to end	Night	71% 7% 6% 8% 7% 1	5577
February	1st to 10th	Night	61% 5% 6% 11% 9% 8%	2809
	11th to 20th	Night	73% 4 6% 5% 8% 3	2592
	21st to end	Night	52% 7% 8% 12% 14% 7%	2108
March	1st to 10th	Night	60% 6% 7% 10% 11% 6%	3740
	11th to 20th	Night	64% 8% 9% 7% 8% 3	3646
	21st to end	Night	60% 9% 12% 10% 5% 3	3571
April	1st to 10th	Night	67% 6% 8% 11% 6% 2	1782
	11th to 20th	Night	57% 7% 10% 18% 8% 1	1627
	21st to end	Night	63% 8% 10% 12% 7%	1406
May	1st to 10th	Night	80% 8% 6% 5%	2220
	11th to 20th	Night	62% 10% 13% 12% 3	1802
	21st to end	Night	61% 11% 16% 10% 2	1718
June	1st to 10th	Night	67% 9% 13% 8% 3	950
	11th to 20th	Night	62% 11% 16% 9% 2	763
	21st to end	Night	62% 12% 17% 8%	760
July	1st to 10th	Night	78% 8% 7% 6% 1	1387
	11th to 20th	Night	75% 9% 13% 2	1550
	21st to end	Night	78% 10% 10% 3	1999
August	1st to 10th	Night	74% 10% 9% 7% 1	2064
	11th to 20th	Night	69% 10% 11% 8% 1	2379
	21st to end	Night	75% 7% 10% 6% 1	2942
September	1st to 10th	Night	77% 8% 8% 5% 2	1739
	11th to 20th	Night	73% 7% 9% 9% 3	2000
	21st to end	Night	72% 7% 8% 10% 3	2090
October	1st to 10th	Night	78% 6% 7% 6% 3	3884
	11th to 20th	Night	63% 6% 9% 9% 12% 1	4094
	21st to end	Night	67% 7% 9% 11% 5% 1	4817
November	1st to 10th	Night	69% 6% 7% 7% 8% 4	2917
	11th to 20th	Night	57% 6% 9% 14% 11% 2	2945
	21st to end	Night	71% 5% 7% 9% 6% 2	3230
December	1st to 10th	Night	73% 6% 8% 7% 5% 1	3230
	11th to 20th	Night	72% 8% 7% 7% 5%	3996
	21st to end	Night	73% 7% 6% 6% 5% 4	5918

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	22% 16% 23% 28% 8% 3	90
	11th to 20th	Day	38% 11% 23% 17% 9% 1	202
	21st to end	Day	42% 14% 19% 19% 6% 1	308
February	1st to 10th	Day	29% 13% 22% 20% 14% 2	352
	11th to 20th	Day	38% 12% 23% 16% 9% 2	365
	21st to end	Day	23% 16% 29% 20% 10% 2	307
March	1st to 10th	Day	26% 11% 26% 21% 15% 1	370
	11th to 20th	Day	28% 11% 24% 18% 14% 5%	370
	21st to end	Day	28% 10% 17% 21% 17% 8%	549
April	1st to 10th	Day	28% 12% 21% 21% 14% 5%	617
	11th to 20th	Day	25% 8% 15% 21% 24% 7%	640
	21st to end	Day	31% 10% 9% 17% 27% 7%	650
May	1st to 10th	Day	43% 12% 14% 12% 16% 4	653
	11th to 20th	Day	31% 5% 11% 24% 23% 6%	675
	21st to end	Day	39% 5% 10% 20% 21% 5%	735
June	1st to 10th	Day	37% 7% 9% 15% 24% 8%	680
	11th to 20th	Day	34% 4 9% 21% 24% 8%	864
	21st to end	Day	39% 3 10% 15% 23% 10%	870
July	1st to 10th	Day	36% 4 8% 17% 27% 7%	778
	11th to 20th	Day	44% 6% 7% 16% 21% 6%	668
	21st to end	Day	43% 5% 10% 17% 17% 8%	739
August	1st to 10th	Day	49% 5% 8% 17% 16% 5%	676
	11th to 20th	Day	48% 6% 9% 18% 14% 5%	665
	21st to end	Day	49% 5% 11% 15% 17% 3	748
September	1st to 10th	Day	53% 7% 8% 13% 14% 5%	663
	11th to 20th	Day	53% 6% 6% 13% 16% 6%	480
	21st to end	Day	44% 8% 14% 16% 11% 8%	390
October	1st to 10th	Day	43% 10% 16% 13% 11% 7%	390
	11th to 20th	Day	43% 9% 14% 20% 12% 3	390
	21st to end	Day	39% 10% 19% 20% 11% 1	429
November	1st to 10th	Day	36% 13% 20% 18% 12% 1	393
	11th to 20th	Day	31% 9% 25% 20% 13% 2	289
	21st to end	Day	43% 14% 23% 13% 6%	90
December	1st to 10th	Day	38% 11% 18% 23% 10%	90
	11th to 20th	Day	38% 19% 22% 17% 4	90
	21st to end	Day	35% 15% 25% 17% 7%	99
January	1st to 10th	Night	30% 11% 21% 24% 12% 1	850
	11th to 20th	Night	38% 14% 22% 17% 9% 1	850
	21st to end	Night	39% 13% 18% 21% 9% 1	935
February	1st to 10th	Night	30% 14% 21% 20% 14% 1	850
	11th to 20th	Night	41% 10% 23% 16% 8% 1	834
	21st to end	Night	25% 12% 29% 21% 11% 3	698
March	1st to 10th	Night	27% 11% 25% 24% 11% 2	660
	11th to 20th	Night	25% 12% 25% 20% 15% 3	617
	21st to end	Night	30% 8% 16% 21% 19% 7%	627
April	1st to 10th	Night	31% 9% 16% 20% 15% 7%	570
	11th to 20th	Night	26% 7% 13% 20% 28% 6%	563
	21st to end	Night	29% 7% 12% 17% 28% 8%	570
May	1st to 10th	Night	41% 9% 8% 16% 19% 6%	570
	11th to 20th	Night	29% 7% 10% 20% 25% 9%	332
	21st to end	Night	36% 4 6% 15% 28% 11%	206
June	1st to 10th	Night	33% 4 11% 13% 24% 15%	190
	11th to 20th	Night	32% 3 12% 12% 27% 15%	190
	21st to end	Night	33% 4 9% 11% 30% 13%	190
July	1st to 10th	Night	38% 4 6% 15% 28% 9%	185
	11th to 20th	Night	38% 5% 5% 17% 24% 12%	184
	21st to end	Night	45% 4 8% 14% 18% 12%	414
August	1st to 10th	Night	48% 3 7% 15% 19% 8%	476
	11th to 20th	Night	53% 3 6% 15% 15% 8%	564
	21st to end	Night	48% 6% 7% 14% 18% 7%	627
September	1st to 10th	Night	50% 5% 9% 14% 17% 5%	570
	11th to 20th	Night	51% 5% 9% 13% 13% 8%	570
	21st to end	Night	49% 8% 8% 16% 15% 4	570
October	1st to 10th	Night	48% 7% 12% 14% 15% 3	746
	11th to 20th	Night	42% 9% 15% 20% 13% 2	860
	21st to end	Night	40% 10% 15% 21% 13% 1	946
November	1st to 10th	Night	40% 12% 19% 18% 10%	877
	11th to 20th	Night	32% 12% 23% 22% 9% 1	850
	21st to end	Night	42% 14% 19% 16% 9% 1	850
December	1st to 10th	Night	45% 8% 18% 18% 8% 2	850
	11th to 20th	Night	35% 12% 23% 20% 8% 2	850
	21st to end	Night	42% 13% 20% 15% 9% 1	935

Page generated at 2024-11-07 03:55:49. Version ac07

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