/**
 * Utility functions for unit conversion and formatting
 */
import { QuantitativeValue } from '../types/noaa.js';
/**
 * Extract numeric value from QuantitativeValue, handling null values
 */
export declare function extractValue(qv: QuantitativeValue | undefined): number | null;
/**
 * Convert Celsius to Fahrenheit
 */
export declare function celsiusToFahrenheit(celsius: number): number;
/**
 * Convert Fahrenheit to Celsius
 */
export declare function fahrenheitToCelsius(fahrenheit: number): number;
/**
 * Convert meters per second to miles per hour
 */
export declare function mpsToMph(mps: number): number;
/**
 * Convert kilometers per hour to miles per hour
 */
export declare function kphToMph(kph: number): number;
/**
 * Convert knots to miles per hour
 */
export declare function knotsToMph(knots: number): number;
/**
 * Convert meters to miles
 */
export declare function metersToMiles(meters: number): number;
/**
 * Convert meters to feet
 */
export declare function metersToFeet(meters: number): number;
/**
 * Convert cubic meters per second to cubic feet per second
 */
export declare function cubicMetersPerSecondToCubicFeetPerSecond(cms: number): number;
/**
 * Convert Pascals to inches of mercury
 */
export declare function pascalsToInHg(pa: number): number;
/**
 * Convert Pascals to millibars/hectopascals
 */
export declare function pascalsToMb(pa: number): number;
/**
 * Format temperature with unit
 */
export declare function formatTemperature(qv: QuantitativeValue | undefined, preferFahrenheit?: boolean): string;
/**
 * Format wind speed with unit
 */
export declare function formatWindSpeed(qv: QuantitativeValue | undefined): string;
/**
 * Format visibility with unit
 */
export declare function formatVisibility(qv: QuantitativeValue | undefined): string;
/**
 * Format pressure with unit
 */
export declare function formatPressure(qv: QuantitativeValue | undefined): string;
/**
 * Format a percentage value
 */
export declare function formatPercentage(qv: QuantitativeValue | undefined): string;
/**
 * Reduce a bearing in degrees to one of sixteen compass points.
 */
export declare function windDirectionFromDegrees(deg: number): string;
/**
 * Format wind direction from degrees to cardinal direction
 */
export declare function formatWindDirection(qv: QuantitativeValue | undefined): string;
/**
 * Format date/time in readable format
 */
export declare function formatDateTime(isoString: string): string;
/**
 * Format date only
 */
export declare function formatDate(isoString: string): string;
/**
 * Relative humidity from temperature and dew point, via the Magnus formula.
 * METAR carries no humidity field; this restores it from the two it does
 * report. Returns whole percent, clamped to 0-100.
 */
export declare function relativeHumidityFromDewpoint(tempC: number, dewpC: number): number;
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